Source: https://patents.google.com/patent/JP3804665B2/en
Timestamp: 2020-01-28 17:48:18
Document Index: 288187228

Matched Legal Cases: ['art 4100', 'art 4200', 'art 4300', 'art 4300', 'arts 5300', 'art, 3200', 'art, 3300', 'art,\n4000', 'art, 4200', 'art,\n4300', 'art, 5000', 'art,\n5200', 'art, 5300', 'art, 5400']

JP3804665B2 - Flexible substrate and electronic device - Google Patents
Flexible substrate and electronic device Download PDF
JP3804665B2
JP3804665B2 JP2004070990A JP2004070990A JP3804665B2 JP 3804665 B2 JP3804665 B2 JP 3804665B2 JP 2004070990 A JP2004070990 A JP 2004070990A JP 2004070990 A JP2004070990 A JP 2004070990A JP 3804665 B2 JP3804665 B2 JP 3804665B2
JP2004070990A
JP2005260066A (en
伊郎 岩佐
裕康 本田
幸成 柴田
啓太郎 藤森
巳広 野々山
2004-03-12 Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
2004-03-12 Priority to JP2004070990A priority Critical patent/JP3804665B2/en
2005-09-22 Publication of JP2005260066A publication Critical patent/JP2005260066A/en
2006-08-02 Publication of JP3804665B2 publication Critical patent/JP3804665B2/en
The present invention relates to a flexible substrate and an electronic device.
For example, in a small electronic device on which a display panel or the like is mounted, the case of transmitting a high frequency between circuits in the electronic device is increasing as the resolution of the display panel is increased. However, signal reflection that occurs between a circuit that transfers high frequency, a transmission line for transmitting high frequency, and a circuit that receives high frequency becomes problematic when transmitting high frequency. This signal reflection occurs due to the difference between the impedance of each circuit and the impedance of the transmission line, and causes signal degradation and unnecessary radiation.
Patent Document 1 describes a portable wireless terminal that has improved reception sensitivity by suppressing unnecessary radiation that occurs when transmitting high frequencies. In the portable wireless terminal described in FIG. 8A of Patent Document 1, a ground layer is provided on the surface of a flexible substrate that connects a high-frequency circuit and a baseband circuit, and unnecessary radiation is performed using the shielding effect of the ground layer. Is suppressed. As a result, the sensitivity of the portable wireless terminal is improved. However, since the input / output impedance of the high-frequency circuit, the characteristic impedance of the wiring on the flexible substrate, and the input / output impedance of the baseband circuit are not impedance matched, It is difficult to transmit a high frequency signal. Further, in the circuit described in Patent Document 1, taking impedance matching for a large number of media interposed between a high-frequency circuit, a flexible substrate, and a baseband circuit leads to an increase in design cost, and taking impedance matching. It is practically difficult.
Patent Document 2 describes a signal transmission cable that improves impedance characteristics by providing impedance components at both ends of a differential signal transmission line for transmitting a differential signal. However, in order to suppress signal reflection between the circuit that transmits the differential signal and the circuit that receives the differential signal, the output impedance of the circuit that transmits the differential signal and the input impedance of the circuit that receives the differential signal Must be matched to the terminal impedance of the signal transmission cable described in Patent Document 2. This complicates the design of a circuit for transmitting and receiving differential signals, hinders cost reduction, and results in an increase in cost even when a low-cost cable is used. Furthermore, providing an extra impedance component on the transmission line causes an increase in power consumption, and is a cable that is particularly unsuitable for portable electronic devices.
Patent Document 3 also describes the use of impedance matching as a method for suppressing unnecessary radiation. However, even in the invention described in Patent Document 3, in order to suppress signal reflection at both ends of a transmission line through which high frequencies are transmitted, it is necessary to set impedance of a circuit connected to both ends of the transmission line. This hinders design cost reduction.
JP-A-9-83233 JP 2002-354053 A JP-A-5-27697
The present invention has been made in view of the technical problems as described above. The object of the present invention is excellent in cost performance, can suppress signal reflection when transmitting a high frequency, and has less signal deterioration. An object of the present invention is to provide a flexible substrate capable of high-speed serial data transfer and an electronic device including the same.
The present invention is a flexible substrate on which a device is mounted, wherein a first part provided with a first device, a second part provided with a second device, and the first part And a wiring portion provided with a plurality of wirings for connecting the first device and the second device, wherein the first device is a portion between the first device and the second portion, , At least a first data transfer control device, the second device includes at least a second data transfer control device, and the first and second data transfer control devices include differential signals (Differential-Signals). ), And a plurality of wirings provided in the wiring part for connecting the first device and the second device are at least for data transfer using the differential signal. One differential signal line It relates to a flexible substrate including A.
According to the present invention, the flexible substrate on which the first device, the second device, and the wiring portion are provided has few portions where signal reflection occurs between the first device and the second device. Therefore, signal degradation can be suppressed, and differential signals can be transferred at high speed via the differential signal line pair. Since the wiring portion is provided on a flexible substrate, the first device and the second device are more connected than when the first device and the second device are connected by wiring such as a coaxial cable. The manufacturing cost of the wiring that connects can be greatly reduced.
Further, in the present invention, when the direction in which a plurality of wirings connecting the first device and the second device are extended and formed is defined as the first direction, the wiring part is A first conductor extends in the lower layer along the first direction, an insulator extends in the first direction on an upper layer of the first conductor, and the insulator is formed on the insulator. It may be configured by forming a plurality of wirings.
By forming the wiring portion in this way, it is possible to suppress the influence on other devices due to unnecessary radiation when transmitting the differential signal. Furthermore, it is possible to prevent the wiring portion from being affected by unnecessary radiation or the like from other devices (for example, signal degradation when transmitting a differential signal). That is, high-speed signal transmission with little signal degradation is possible.
In the present invention, the characteristic impedance determination parameter that determines the characteristic impedance of the first and second differential signal lines constituting the differential signal line pair is set to each of the first and second differential signal lines. A characteristic width of each of the first and second differential signal lines, including a wiring width, a wiring thickness, a wiring length, a thickness of the insulator and a dielectric constant of the insulator; At least one of the characteristic impedance determination parameters of the first and second differential signal lines is set so that the input / output impedance of at least one of the first device and the second device is impedance matched. May be.
According to the present invention, by adjusting the characteristic impedance determination parameter, the characteristic impedance of the wiring portion can be set so as to be impedance matched with the first device and the second device. That is, by adjusting the characteristic impedance determination parameter after determining the shape of the wiring portion, the shape of the wiring portion can be freely laid out according to the intended use.
In the present invention, the plurality of wirings include a plurality of differential signal line pairs, and the plurality of differential signal pairs are formed on the insulator, and the plurality of differential signals are formed on the insulator. Between each of the signal line pairs, a second conductor may be formed extending along the first direction.
According to the present invention, the second conductor has a shielding effect, and signal transmission with sufficiently high signal quality is possible for higher-speed serial data transfer.
Further, in the present invention, when the direction in which a plurality of wirings connecting the first device and the second device are extended and formed is defined as the first direction, the wiring part is A third conductor extends in the lower layer along the first direction, an insulator extends in the first direction on the upper layer of the third conductor, and the third conductor is formed on the insulator. 4 conductors may be formed extending, and the plurality of wirings may be formed in the insulator.
According to the present invention, the third conductor has a shielding effect, and the plurality of wirings are formed in the insulator. Therefore, the plurality of wirings provided in the wiring portion are subject to signal degradation. High-speed signal transmission with less noise is possible.
In the present invention, the plurality of wirings include a plurality of the differential signal line pairs, and a direction in which the plurality of wirings connecting the first device and the second device are formed to extend is formed. When the first direction is adopted, the plurality of wirings include a plurality of differential signal line pairs, and the wiring part is formed with an insulator extending along the first direction. The plurality of wirings are formed on the insulator, and a second conductor extends along the first direction between each of the plurality of differential signal line pairs on the insulator. Even if a plurality of signal lines other than the first and second differential signal lines constituting the differential signal line pair are formed on the side below the body where the plurality of wirings are not formed. Good.
According to the present invention, the second conductor has a shielding effect and can prevent signal deterioration when transmitting a differential signal. Furthermore, by providing a plurality of signal lines other than the first and second differential signal lines constituting the differential signal line pair on the side where the plurality of wirings are not formed, the area of the wiring portion is reduced. It is possible to reduce. That is, the degree of freedom of the layout of the wiring portion can be expanded, and the manufacturing cost can be reduced.
In the present invention, each of the plurality of signal lines may be wired to the insulator so as to be disposed below the second conductor. Thereby, interference between a plurality of signal lines other than the first and second differential signal lines constituting the differential signal line pair and the differential signal line pair can be suppressed.
In the present invention, at least one of the first device and the second device makes the input / output impedance of the at least one device variable according to the characteristic impedance of the differential signal line pair. An input / output impedance variable circuit may be included.
According to the present invention, the first device or the second device can achieve impedance matching with respect to various characteristic impedances of the wiring portion by using the input / output impedance variable circuit. That is, it is not necessary to manufacture the first device or the second device for each wiring having different characteristic impedance, and the manufacturing cost can be reduced. Furthermore, the flexibility of the layout of the wiring part can be expanded by adapting to various characteristic impedances of the wiring part.
In the present invention, the input / output impedance variable circuit includes an impedance setting register in which impedance setting information is written, and the input / output impedance variable circuit is based on the impedance setting information in the impedance setting register. The input / output impedance of one device may be set. According to this configuration, by inputting a control signal or the like to the input / output impedance variable circuit, the input of the first device or the second device can be performed based on the impedance information stored in the impedance setting register. Output impedance can be set.
In the present invention, devices other than the data transfer control device may be integrated in at least one of the first device and the second device.
In the present invention, the first terminal to which the first device signal line connected to the first device is connected and the second terminal to which the second device signal line connected to the second device is connected. Terminal may be provided.
The present invention includes a flexible substrate described above, a first device portion provided with the first portion of the flexible substrate, a second device portion provided with the second portion of the flexible substrate, Related to electronic devices including
According to the present invention, large-capacity data can be transferred at high speed between the first device portion and the second device portion via the differential signal line pair. Furthermore, the manufacturing cost of the electronic device can be reduced.
The present invention further includes a device connection portion for connecting the first device portion and the second device portion, wherein the device connection portion is an electronic device provided with the wiring portion of the flexible substrate. Involved.
According to the present invention, since the wiring portion provided on the flexible board has flexibility, the wiring portion is provided on the device connection portion, thereby reducing the shape of the device connection portion. Design flexibility.
The present invention provides a flexible board provided with the first terminal and the second terminal described above, a first board connected to the first terminal of the flexible board, and the flexible board. The present invention relates to an electronic device including a second substrate connected to a second terminal.
According to the present invention, high-speed data transfer can be performed between the first substrate and the second substrate. In addition, it is possible to reduce the manufacturing cost of an electronic device that includes the first substrate and the second substrate and is capable of high-speed data transfer between the substrates.
The present invention provides a flexible board provided with the first terminal and the second terminal described above, a connection portion for connecting to the first terminal, and a connection for connecting to the second terminal. And a substrate provided with a portion.
According to the present invention, between the connection portion for connecting to the first terminal provided on the substrate and the connection portion for connecting to the second terminal on the substrate or in the substrate. Other wiring or the like can be provided. Because the differential signal line pair is provided in the wiring portion of the flexible substrate, a space is generated between the substrate and the differential signal line pair. For this reason, the interference etc. which the wiring part of the flexible substrate gives to the other wiring provided on the substrate or in the substrate are alleviated. For the same reason, another device, an IC, or the like may be provided on the substrate between the connection portion for connecting to the first terminal and the connection portion for connecting to the second terminal. it can. That is, the degree of freedom in the layout of the substrate can be expanded, and the area of the substrate can be used effectively.
1. Flexible Substrate FIG. 1 is an overall view of a flexible substrate 10. The flexible substrate 10 includes a first portion AR1 provided with the first device DV1, a second portion AR2 provided with the second device DV2, and a wiring portion AR3 provided with a plurality of wirings. The first part AR1, the second part AR2, and the wiring part AR3 are integrally formed, for example. The plurality of wirings include, for example, a differential signal line pair DSP and a signal line S1. The differential signal line pair DSP includes a first differential signal line DS1 and a second differential signal line DS2. The first portion AR1 is provided with, for example, a first terminal P1 for connecting to another substrate, and a first device signal line PS1 for connecting the first device DV1 and the first terminal P1. ing. The second portion AR2 is provided with, for example, a second terminal P2 for connecting to another substrate, and a second device signal line PS2 for connecting the second device DV2 and the second terminal P2. ing. The flexible substrate 10 in FIG. 1 is provided with a total of three signal lines including the first differential signal line DS1, the second differential signal line DS2, and the signal line S1, but the present invention is not limited to this. The flexible substrate 10 may be provided with a plurality of differential signal line pairs DSP and a plurality of signal lines S1. For simplification of description, only one first device signal line PS1 and second device signal line PS2 are shown, but the present invention is not limited to this. The first device signal line PS1 and the second device signal line PS2 may be wired as a plurality of signal lines as required for data transfer. Hereinafter, the same symbols represent the same meaning. Reference numeral 5-5 denotes a cross-sectional line for showing a cross section of the wiring portion of FIG. 1 in FIG.
The first device DV1 includes a first data transfer control device 100. The second device DV2 includes a second data transfer control device 200. The second data transfer control device 200 generates serial data based on a signal input from the second terminal P2 via the second device signal line PS2, and sends a differential signal to the first data transfer control device 100. Serial data is transferred at high speed via the line pair DSP. The first data transfer control device 100 receives serial data transferred via the differential signal line pair DSP, analyzes the serial data, and sends the analysis result to the second terminal P1 via the first device signal line PS1. Output to.
The second data transfer control device 200 can also receive serial data, and the first data transfer control device 100 can also send serial data. In this case, the serial data transfer procedure described above is reversed. That is, the first data transfer control device 100 generates serial data based on the signal input via the first device signal line PS1, and converts the serial data to the second data via the differential signal line pair DSP. Transfer to the transfer control device 200. Upon receiving the serial data, the second data transfer control device 200 analyzes the serial data, generates a signal based on the analysis result, and outputs the signal to the second terminal P2 via the second device signal line PS2. To do.
The wiring portion of the flexible substrate 10 includes a portion formed along the direction DR1 (first direction in a broad sense) and a portion formed along the direction DR2 (first direction in a broad sense) of FIG. However, it is not limited to this. In the flexible substrate 10, the wiring part AR3 may be formed along a straight line in the direction DR1, for example. In other words, it can be formed in various shapes depending on the shape of the device to be mounted. Note that directions DR1 and DR2 in FIG. 1 indicate directions in which a plurality of wirings are formed to extend.
FIG. 2 shows the first data transfer control when the second data transfer apparatus 200 is a host (data transmission side device) and the first data transfer apparatus 100 is a target (data reception side device). FIG. 3 is a diagram illustrating a connection relationship between the device 100, a second data transfer control device 200, and a differential signal line pair DSP. For the sake of explanation, FIG. 2 is simplified, but not limited thereto.
FIG. 3 is a diagram showing the connection relationship among the first data transfer control device 100, the first differential signal line DS1, and the second data transfer control device 200, further simplifying FIG.
The first data transfer control device 100 and the second data transfer control device 200 in FIG. 2 transfer a differential signal by, for example, a current driving method. In this case, since the second data transfer control device 200 (host) transfers differential signals using the constant current source 201 shown in FIG. 3, the output impedance of the host 200 becomes infinite. Each signal transmitted from the host 200 of FIG. 2 via the first differential signal line DS1 and the second differential signal line DS2 provided in the wiring part AR3 is the first signal of the current-voltage conversion circuit 110. The voltage is converted into voltage amplitude by the conversion circuit 111 and the second conversion circuit 112. Comparator COMP1, which has received each converted signal, outputs a signal corresponding to the difference in voltage amplitude of each signal.
A first differential signal line DS1 is connected to a connection point IN1 of the first data transfer control device 100 (hereinafter also referred to as a target) in FIG. When serial data or the like is transferred at high speed, reflection of signals at the connection points IN1 and IN2 becomes a problem. Therefore, at the connection point IN1, the characteristic impedance Z1 of the first differential signal line DS1 and the input impedance R100 of the target 100 are impedance-matched in order to prevent reflection of the transmitted signal. Similarly, at the connection point IN2, the characteristic impedance Z2 of the second differential signal line DS2 and the input impedance R200 of the target 100 are impedance matched. For convenience of description, when a resistor or the like is shown, it is represented by the same symbol as the symbols R100 and R200 used for the resistance value and impedance of the resistor.
The first data transfer control device 100 and the second data transfer control device 200 according to the present embodiment can change the values of the input impedances R100 and R200, which will be described later. Note that by making the values of the input impedances R100 and R200 variable, the impedance matching between the characteristic impedances of the first and second differential signal lines DS1 and DS2 and the input / output impedance of the target 100 can be flexibly performed. That is, the shape of the wiring portion AR3 in FIG. 1 can be freely laid out.
FIG. 4 shows the connection between the first and second data transfer control devices 100 and 200 and the first differential signal line DS1 when the first and second data transfer control devices 100 and 200 transfer a differential signal by the voltage drive method. FIG. The host 200 of FIG. 4 includes an output impedance R300 to generate a signal using the constant voltage source 202. In this case, the output impedance R300 of the host 200 is impedance matched with the characteristic impedance Z1 of the first differential signal line DS1. Further, by making the output impedance R300 of the host 200 variable, the output impedance R300 can be impedance-matched to various characteristic impedances Z1. That is, the shape of the wiring portion AR3 in FIG. 1 can be freely laid out.
5 is a cross-sectional view showing a 5-5 cross section of the wiring portion of FIG. A conductor (first conductor in a broad sense) CD1 is formed below the wiring portion AR3. An insulator 12 is formed in the upper layer of the conductor CD1. Furthermore, a first differential signal line DS1, a second differential signal line DS2, and a signal line S1 are formed in the upper layer of the insulator 12. The wiring width W, the wiring thickness H, the insulator thickness T, and the dielectric constant of the insulator are parameters that determine the characteristic impedance of the wiring (characteristic impedance determination parameter in a broad sense). Furthermore, the length of each wiring in the wiring portion AR3 connecting the host 200 and the target 100 is also a parameter that determines the characteristic impedance of the wiring. The characteristic impedance can be adjusted by adjusting at least one of the characteristic impedance determination parameters.
By adjusting each of the characteristic impedance determination parameters, a characteristic impedance that is easily impedance-matched with the input / output impedance of the host 200 or the target 100 is set for the first differential signal line DS1 and the second differential signal line DS2. can do.
FIG. 6 is a diagram showing a part of the circuit of the target 100. The host 200 includes a plurality of N-type transistors QN1 to QN4, inverters INV1 and INV2, and constant current sources 201H and 201L. The target 100 includes a current-voltage conversion circuit 110 and an input / output impedance variable circuit 120. The input / output impedance variable circuit 121 includes a low impedance generation circuit 131 and a variable resistor R100.
In the host 200, for example, when a signal having a voltage level of HI (hereinafter also referred to as signal H) is input to the input point VIN, the signal inverted by the inverter INV1, that is, a signal having a voltage level of LOW (hereinafter referred to as signal). L) is input to the gates of the transistors QN1 and QN4, and the transistors QN1 and QN4 are turned on. Further, the signal L is input to the inverter INV2 by the inverter INV1. The inverter INV2 inverts the signal L and outputs the signal H to the gates of the transistors QN2 and QN3. As a result, the transistors QN2 and QN3 are turned off.
With the above-described state, the first differential signal line DS1 is conductively connected to the constant current source 201H, and the second differential signal line DS2 is conductively connected to the constant current source 201L. With this operation, the host 200 outputs the differential signal to the first and second differential signal lines DS1 and DS2. The target 100 analyzes the differential signal transmitted through the first and second differential signal lines DS1 and DS2.
In the target 100, the first conversion circuit 111 of the current-voltage conversion circuit 110 includes, for example, a P-type MOS transistor QP1. When a constant current IH flows between the source and drain of the P-type transistor QP1, a specific voltage VH corresponding to the constant current is generated at the node N1. That is, when the constant current IH flows between the node N1 and the connection point IN1, the voltage VH is generated at the node N1. This is because the constant current IH flows between the node N1 and the connection point IN1 by the current signal transmitted from the host 200 via the first differential signal line DS1, and the constant current IH is converted into the voltage VH. It shows that.
The second conversion circuit 112 of the current-voltage conversion circuit 110 includes, for example, a P-type MOS transistor QP2. The constant current IL generated between the connection point IN2 and the node N2 by the current signal transmitted through the second differential signal line DS2 is changed to the voltage VL by the same operation as the first conversion circuit 111 described above. Convert.
The comparator COMP1 compares the voltage VH and the voltage VL converted by the first and second conversion circuits 111 and 112, and outputs the comparison result to the output point VOUT.
The low impedance generation circuit 131 of the input / output impedance variable circuit 121 includes, for example, an inverter INV3 and an N-type transistor QN5. Inverter INV3 inverts the signal transmitted to node N3 and outputs the inverted signal to the gate of N-type transistor QN5. N-type transistor QN5 controls the current flowing between the source and drain of transistor QN5 in accordance with the signal input to the gate of transistor QN5. With such a configuration, when a current flows between the node N1 and the node N3, the impedance at the node N3 is, for example, about 10 ohms to 50 ohms, which is more than the characteristic impedance Z1 of the first differential signal line DS1. Is sufficiently small.
The input / output impedance variable circuit 121 uses the variable resistor R100 to supplement the impedance generated by the low impedance generation circuit 131 with the impedance, thereby inputting the characteristic impedance Z1 of the first differential signal line DS1 and the input of the target 100. The impedance can be impedance matched. For example, when impedance matching with the characteristic impedance Z1 of the first differential signal line DS1 is desired, the total value of the resistance value of the variable resistor R100 and the resistance value generated by the low impedance generation circuit 131 is the characteristic. What is necessary is just to set the value of variable resistor R100 so that it may become equal to impedance Z1.
The input / output impedance variable circuit 122 including the low impedance generation circuit 132 and the variable resistor R200 operates in the same manner as the input / output impedance variable circuit 121 described above, and the characteristic impedance Z2 of the second differential signal line DS2 and the target 100. The impedance can be matched with the input impedance. The low impedance generation circuit 132 functions in the same manner as the low impedance generation circuit 131 described above, and includes an N-type transistor QN6 and an inverter INV4.
When the impedance generated by the low impedance generation circuit 131 is impedance matched with the characteristic impedance Z1 of the first differential signal line DS1, the variable resistor R100 need not be provided. Also in the case of the low impedance generation circuit 132 in the same manner as described above, the variable resistor R200 may not be provided.
Although not shown, the variable resistors R100 and R200 are provided with impedance setting registers in which impedance setting information for setting the impedance of the variable resistors R100 and R200 is written in the input / output impedance variable circuits 121 and 122, respectively. The impedance of the variable resistors R100 and R200 may be set using an impedance setting register. The characteristics of the wiring connected to the first and second devices DV1 and DV2 by writing impedance setting information for setting the impedance of the variable resistors R100 and R200 in the impedance setting register at the time of designing or manufacturing the flexible substrate 10 Impedance matching with impedance can be easily achieved.
FIG. 7 is a schematic side view of the flexible substrate 10 of FIG. 1 viewed from the direction DR3 of FIG. For simplification of description, FIG. 7 omits the first terminal P1, the second terminal P2, the conductor CD1, and the like. In the present embodiment, the first and second devices DV <b> 1 and DV <b> 2 are bare chip mounted on the flexible substrate 10. Therefore, in the flexible substrate 10 of the present embodiment, the plurality of wirings provided in the wiring part AR3 do not pass through connection parts such as connectors, and the bumps BP1, BP2, etc. of the first and second devices DV1, DV2 etc. Connected directly. For example, the bump BP1 of the first device DV1 is connected to the first differential signal line DS1, and the bump BP2 of the second device DV2 is connected to the first differential signal line DS1. The first device DV1 and the second device DV2 are impedance-matched to the first and second differential signal lines DS1, DS2. However, in reality, even if the impedance of each wiring is impedance matched at the connection point between the wirings, slight signal reflection occurs at the connection point.
However, in the present embodiment, there are two connection points of the bumps BP1 and BP2 between the first and second devices DV1 and DV2 and the first and second differential signal lines DS1 and DS2. That is, the invention is devised so that the number of occurrences of the slight signal reflection described above is reduced. For this reason, when transmitting a high frequency, signal deterioration can be prevented, for example, high-speed serial data transfer is attained.
Next, using FIG. 8 and FIG. 9, the signal reflection occurrence location in the above-described embodiment is compared with the signal reflection occurrence location in the comparative example. FIG. 8 is a diagram of a comparative example according to the present embodiment. The substrate 21 is provided with a first device DV1, and the substrate 22 is provided with a second device DV2. The substrate 21 and the substrate 22 are connected to each other by a plurality of wirings (first and second differential signal lines DS1, DS2, signal line S1) provided on the flexible substrate 20 via connectors CN1 and CN2. . The first and second devices DV1 and DV2 are connected to the connectors CN1 and CN2 via the wirings LN1 and LN2.
FIG. 9 is a schematic side view of the substrates 21 and 22 and the flexible substrate 20 of FIG. 8 viewed from the direction DR4. The reflection point RF1 indicates, for example, a connection portion between the first differential signal line DS1 and the connector CN1. The reflection point RF2 indicates, for example, a connection portion between the connector CN1 and the wiring LN1. A reflection point RF3 indicates a connection portion between the wiring LN1 and the bump BP1 of the first device DV1. Similarly, on the side where the second device DV2 is provided, the reflection points RF4 to RF6 include, for example, connection points between the differential signal line DS2 and the connector CN2, connection points between the connector CN2 and the wiring LN2, and wirings. A connection point between LN2 and bump BP2 is shown. Between the first device DV1 and the second device DV2, when signals are transmitted, it passes through a total of six reflection points, reflection points RF1 to RF6. In addition, when the first and second devices DV1 and DV2 are not mounted on the bare chip, signal reflection occurs at the connection portion between the substrate 23 (for example, the interposer) and the wire WR of the IC chip as shown in FIG. This connecting portion also becomes the reflection point RF7, and the number of reflection points increases. In the configuration as shown in FIGS. 9 and 10, it is difficult to transfer serial data at high speed in consideration of signal degradation and the like. However, since the flexible substrate 10 of this embodiment (see FIG. 7) has only two reflection points, signal transmission with less signal degradation is possible compared to the flexible substrate 20 shown in FIG. Further, in order to minimize signal reflection at each reflection point, it is necessary to perform impedance matching at the time of design. In the comparative example of FIG. 8, since there are many reflection points, the problem of the increase in manufacturing cost accompanying impedance matching arises. However, also in this regard, the flexible substrate 10 of the present embodiment has a small number of reflection points, and furthermore, by providing the input / output impedance variable circuits 121 and 122, impedance matching can be easily achieved, and the manufacturing cost can be reduced. Is possible.
2. Host-Target Next, the data transfer processing of the first and second data transfer control devices 100 and 200 in this embodiment will be briefly described with reference to FIG. The first data transfer control device (target) 100 includes a transceiver 150 that performs physical layer processing, a link controller 160 that performs link layer processing, and an interface circuit 170. The interface circuit 170 can be connected to a display device (for example, the main panel LCD1 or the sub panel LCD2) via an interface bus. Similarly, the second data transfer control device (host) 200 includes a transceiver 250, a link controller 260, and an interface circuit 270. The interface circuit 270 can be connected to a processor or the like via, for example, a system bus. The target 100 and the host 200 perform high-speed data transfer of serial data via a serial bus. In the present embodiment, the serial bus includes a differential signal line pair (first and second differential signal lines DS1, DS2).
The host 200 can supply a clock to the target 100, and the target 100 can use the supplied clock as the system clock of the target 100. A signal from the processor or the like is output to the link controller 260 by the interface circuit 270. The link controller 260 generates a request packet (write request packet, read request packet) based on the output from the interface circuit 270 and instructs the transceiver 250 to transmit the generated request packet. As a result, a transmission transaction is activated, and the transceiver 250 performs processing to transmit the request packet to the target 100 via the serial bus. Incidentally, the transceiver 250 can also receive a request packet from the first data transfer control device 100. In this case, the link controller 260 analyzes the received request packet and performs link layer (transaction layer) processing.
The transceiver 150 of the target 100 receives and processes the request packet of the host 200 transmitted via the serial bus. The link controller 160 analyzes the received request packet and performs a link layer (transaction layer) process. Incidentally, the transceiver 150 can also perform processing for transmitting a request packet to the first data transfer control device 200. In this case, a request packet to be transmitted by the link controller 160 is generated, and the transceiver 150 is instructed to transmit the generated request packet.
The interface circuits 170 and 270 are circuits for performing data transfer via a bus (parallel bus) different from the serial bus. For example, when the main panel LCD 1 has an RGB interface (stream interface in a broad sense) and the sub-panel LCD 2 has an MPU interface (command / data interface in a broad sense), the interface panel 170 connects to a common interface bus. However, data corresponding to each can be transferred. That is, when transferring display data to the main panel LCD 1 or the sub panel LCD 2, the processor can transmit data to the system bus without paying much attention to the interface difference between the main panel LCD 1 and the sub panel LCD 2. Thereby, a highly versatile interface can be provided.
Note that the configuration of the first and second data transfer control devices 100 and 200 is not limited to FIG. For example, the first and second data transfer control devices 100 and 200 may be configured not to include the interface circuits 170 and 270, or other circuit blocks may be provided.
FIG. 12 is a block diagram illustrating an outline of an example of a system including the flexible substrate 10 according to the present embodiment. The display unit 1000 (first substrate in a broad sense) includes, for example, a main panel LCD1 and a sub panel LCD2. The control unit 2000 (second board in a broad sense) includes, for example, an imaging device (for example, a CCD, a CMOS sensor, etc.) 2100, a memory 2200, a baseband engine 2300, and an application processor 2400. The imaging device (for example, CCD, CMOS sensor, etc.) 2100, the memory 2200, the baseband engine 2300, and the application processor 2400 are connected by an internal bus. Note that the system shown in FIG. 12 is not limited to this. For example, the control unit 2000 may not include the baseband engine 2300, the imaging device 2100, and the like. Display unit 1000 may be configured to omit either main panel LCD 1 or sub panel LCD 2.
The target 100 can transmit a signal transmitted through the signal line S1 to the main panel LCD1, for example, through the signal transmitted through the signal line S1. That is, by using the flexible substrate 10 of the present embodiment, serial data transfer that is not high-speed and high-speed serial data transfer that uses a differential signal can be performed simultaneously. For example, data with a small data size, for example, generated by the baseband engine 2300 or the like can be transferred via the signal line S1 when it is not necessary to transfer at high speed. For example, data generated by the application processor 2400 and the like having a large data size can be transferred at high speed via the first and second differential signal lines DS1 and DS2.
3. Modified Example of Wiring Portions As shown in FIG. 5, the plurality of wires in the wiring portion AR3 of the flexible substrate 10 of the present embodiment are formed by, for example, microstrip lines. The modification according to the present embodiment may have a cross-sectional structure (for example, a strip type structure or a strip line) as shown in FIG. A conductor (third conductor in a broad sense) CD3 is formed below the wiring portion AR3 of the modification, and extends along the direction DR1 or the direction DR2 in FIG. A plurality of wirings (for example, first and second differential signal lines DS1, DS2, signal line S1, etc.) are formed in the insulator 12, and a conductor (fourth conductor in a broad sense) is formed on an upper layer of the insulator 12. ) CD4 is formed. Even in such a structure, the characteristic impedance can be set by adjusting the width W of the wiring, the thickness H of the wiring, and the thickness T of the insulator 12, which are parameters for determining the characteristic impedance.
FIG. 14 is a schematic view showing a flexible substrate 30 which is another modification according to this embodiment. In the wiring portion AR3 connecting the first portion AR1 and the second portion AR2, a plurality of differential signal line pairs DSP and a plurality of conductors CD2 (second conductor in a broad sense) extend along the direction DR1. Is formed. The differential signal line pair DSP includes first and second differential signal lines DS1 and DS2. In FIG. 14, wiring other than the differential signal line pair DSP (for example, the signal line S <b> 1) is omitted for simplification of description, but the present invention is not limited to this. The wiring portion AR3 may be provided with one pair of differential signal line pairs DSP instead of the plurality of differential signal line pairs DSP, and one conductor CD2 is provided along the direction DR1 instead of the plurality of conductors CD2. It may be formed extending. Note that the plurality of wirings of the wiring part AR3 in FIG. 14 are formed by, for example, microstrip lines. Instead of forming the signal line S1 (not shown) as a microstrip line, only the differential signal line pair DSP may be formed as a microstrip line.
15 is a cross-sectional view showing a 15-15 cross section of FIG. A conductor (third conductor) CD3 is formed below the wiring portion AR3. The conductor CD3 is formed to extend along the direction DR1 in FIG. By providing the conductor CD2 between the plurality of differential signal line pairs DSP, the conductor CD2 has a shielding effect, and the flexible substrate 30 of the modified example performs data transfer with higher quality and less signal deterioration. Can do.
FIG. 16 is a view showing a cross section of a flexible substrate 40 which is a modification of the flexible substrate 30 of FIG. The plurality of wirings of the wiring part AR3 of the flexible substrate 40 are formed by, for example, coplanar lines. The upper surface of the flexible substrate 40 is shown as in FIG. What is different from the flexible substrate 30 is the cross-sectional structure of the wiring portion AR3. According to the cross-sectional view of FIG. 16, in the wiring portion AR3 of the flexible substrate 40, the signal line S1 is formed in the lower layer of the wiring portion AR3, and the insulator 12 is formed in the upper layer. In addition, a differential signal line pair DSP and a conductor CD2 are formed in the upper layer of the insulator 12. The differential signal line pair DSP, the signal line S1, and the conductor CD2 are formed to extend along the direction DR1 in FIG. The conductor CD2 has a shielding effect as in FIG. Due to this shielding effect, the flexible substrate 40 can perform data transfer with little signal deterioration. Further, due to this shielding effect, the signal line S1 can be formed below the conductor CD2 (for example, a position facing the conductor CD2 along the direction DR5 in FIG. 16) in the cross-sectional view of FIG. Interference with the dynamic signal line pair DSP can be suppressed. Thereby, the flexible substrate 40 of a modification has the effect that the wiring width LW of the wiring part AR3 of the flexible substrate 40 can be reduced in addition to the effect of preventing signal deterioration. In addition, this structure does not require a particularly complicated manufacturing process, and is excellent in cost performance. That is, the flexibility of the layout of the wiring part AR3 is expanded, and the flexible substrate 40 with high versatility can be provided at low cost.
In FIG. 16, a plurality of differential signal line pairs DSP and a plurality of signal lines S1 are shown, but the present invention is not limited to this. In the wiring portion AR3, one pair of differential signal line pairs DSP may be formed instead of the plurality of differential signal line pairs, or one signal line S1 is formed instead of the plurality of signal lines S1. May be. Each of the plurality of signal lines S1 is formed directly below the conductor CD2, but is not limited to this. A signal line S1 may be formed below the differential signal line pair DSP.
4). Connection Form of Flexible Substrate FIG. 17 is a view showing a form in which the application processor 2400 is connected to the main panel LCD 1 and the sub panel LCD 2 using the flexible substrate 10 of FIG. The application processor 2400 can send display data or the like to the main panel LCD 1 or the sub panel LCD 2 via the flexible substrate 10. When the application processor 2400 does not need to use a differential signal when receiving information from the main panel LCD1 or the subpanel LCD2, the function of receiving the differential signal of the second data transfer control device 200 (host) is omitted. be able to. Similarly, the function of transmitting the differential signal of the first data transfer control device 100 (target) can be omitted. Thus, by omitting the functions of the first and second data transfer control devices 100 and 200, the manufacturing cost of the first and second data transfer control devices 100 and 200 can be reduced. That is, the flexible substrate 10 can be provided at a low cost.
FIG. 18 is a diagram illustrating a form in which the application processor 2400 and the imaging device 2100 are connected using the flexible substrate 10 of FIG. Image data or the like acquired by the imaging device 2100 is transmitted to the application processor 2400 via the flexible substrate 10. When it is not necessary to use a differential signal when sending data from the application processor 2400 to the imaging device 2100 via the flexible substrate 10, the function of transmitting the differential signal of the first data transfer control device 100 is omitted. can do. Similarly, the function of receiving the differential signal of the second data transfer control device 200 can be omitted. Similarly to the above, the manufacturing cost of the first and second data transfer control devices 100 and 200 can be reduced. That is, the flexible substrate 10 can be provided at a low cost.
FIG. 19 is a diagram showing a form in which the main panel LCD 1 and the imaging device 2100 are connected to the application processor 2400 using the flexible substrate 10 of FIG. Since the first and second data transfer control devices 100 and 200 have the function of transmitting and receiving differential signals, bidirectional data communication is possible between the application processor 2400, the main panel LCD 1 and the imaging device 2100. is there. Data from the application processor 2400 is transmitted to the main panel LCD 1 via the differential signal line pair of the flexible substrate 10. Also, image data and the like of the imaging device 2100 are transmitted to the application processor 2400 via the differential signal line pair of the flexible substrate 10. Since image data and the like of the imaging device 2100 can be transferred at high speed using a differential signal, the imaging device 2100 does not have to be provided near the application processor 2400, and the degree of freedom in design is increased.
In FIGS. 17 to 19, the flexible substrate 10 is shown as an example, but similar connection forms are possible for modifications of the flexible substrate 10 (for example, the flexible substrates 30 and 40). Moreover, in FIGS. 17-19, although the application processor 2400 is illustrated as a device connected to the flexible substrate 10, it is not limited to this. For example, the baseband engine 2300 and the application processor 2400 can be connected to the flexible substrate 10 and its modification.
FIG. 20 is a schematic view showing a flexible substrate 50 which is another modification of the flexible substrate 10. The difference from the flexible substrate 10 is that the power supply circuit PC, the capacitor CC, and the resistor RR are provided on the side of the flexible substrate 50 where the first data transfer control device 100 is provided. The flexible substrate 50 may have a configuration in which any one of the power supply circuit PC, the capacitor CC, and the resistor RR is omitted. The structure of the wiring portion AR3 of the flexible substrate 50 may be the same as the structure of the wiring portion AR3 shown in the flexible substrates 30 and 40 described above.
A substrate (for example, a glass substrate) 25 is provided with a display panel LCD3 and a display driver DRV. FIG. 21 is a partial side view of the portion of the substrate 25 and the flexible substrate 50 where the first data transfer control device 100 is provided as viewed from the direction DR6. Although the flexible substrate 50 is directly connected to the substrate 25 according to FIG. 21, it may be connected via a connection component such as a connector. If the flexible substrate 50 is used, it is not necessary to separately provide a power supply circuit for the display panel LCD3 and the display driver DRV, and a display system using the application processor 2400 and the substrate 25 provided with the display panel LCD3 is easy. Can be manufactured. That is, the manufacturing cost of the display system can be reduced by shortening the design time.
FIG. 22 is a schematic view showing a flexible substrate 60 which is another modification of the flexible substrate 10. The configuration points different from the flexible substrate 10 are that the display driver DRV is provided on the side where the first data transfer control device 100 of the flexible substrate 60 is provided, and the second data transfer control device of the flexible substrate 60. The application processor 2400 is provided on the side where 200 is provided. The flexible substrate 60 may be connected to the display panel LCD4 via a connection component such as a connector, or may be connected without a connection component such as a connector. With such a configuration, the flexible substrate 60 can be connected to the display panel LCD 4 in which the display driver DRV is not provided. In addition, since the application processor 2400 is provided on the flexible substrate 60, a display system or the like can be easily configured using the display panel LCD4 and the flexible substrate 60. As described above, the power supply circuit PC, the capacitor CC, the resistor RR, and the like may be provided on the side of the flexible substrate 60 where the display driver DRV is provided. As described above, other devices (for example, the application processor 2400, the display driver DRV, the power supply circuit PC, the capacitor CC, the resistor RR, etc.) are disposed near the first and second data transfer control devices 100 and 200 on the flexible substrate 60. By providing, it is possible to shorten the design time of a system using the flexible substrate 60 such as a display system, and to reduce the manufacturing cost. The structure of the wiring portion AR3 of the flexible substrate 60 may be the same as the structure shown in the flexible substrates 30 and 40. In addition, the flexible substrate 60 may have a configuration in which the application processor 2400 is omitted.
Further, a configuration in which a processor such as an application processor 2400 is provided on the flexible substrate 10, 30, 40, 50 is also possible.
In FIG. 17 to FIG. 19 and FIG. 22, a plurality of wirings are omitted for simplification of description.
5). Electronic Device The flexible substrate 10 of the present embodiment can be applied to various electronic devices. FIG. 23 is a schematic view showing the substrate 28 to which the flexible substrate 70 is connected. The flexible substrate 70 is a flexible substrate formed by extending the wiring portion AR3 of the flexible substrate 10 in FIG. 1 along the direction DR7 without being bent. For simplification of explanation, a plurality of wirings are omitted in FIG. The device DV3 is connected to the connector CN3, and the device DV4 is connected to the connector CN4. The flexible substrate 70 is connected to the connectors CN3 and CN4. That is, the device DV3 and the device DV4 are connected via the flexible substrate 70. In the wiring part AR3 of the flexible substrate 70, the first and second data transfer control devices 100 and 200 transmit high frequencies.
FIG. 24 is a schematic side view of the substrate 28 of FIG. 23 viewed from the direction DR8. According to FIG. 24, there is a space where nothing is formed between the flexible substrate 70 and the substrate 28. Therefore, it is possible to mitigate the influence of the high frequency transmitted in the wiring part AR3 of the flexible substrate 70 on the part AR4 of the substrate 28. Thereby, it is possible to form other wirings or provide other circuits in the portion AR4 of the substrate 28.
Usually, when a high frequency is transmitted in a multilayer substrate, peripheral wiring and circuits are affected. Therefore, it is difficult to increase the number of substrates that transmit a high frequency. However, the use of the flexible substrate 70 as shown in FIG. This can reduce the manufacturing cost of the electronic device including the substrate 28 provided with the flexible substrate 70. In addition, since the substrate 28 can be multi-layered, an electronic device including the substrate 28 can be designed in a small size. In addition, since a circuit or the like can be arranged in the portion AR4 of the substrate 28, the area of the substrate 28 can be used effectively.
FIG. 25 is a schematic perspective view showing the entire small electronic device on which the display panel is mounted. The electronic device 3000 includes a first device portion 3100, a second device portion 3200, and a connection portion 3300 that connects the first device portion 3100 and the second device portion 3200. The first device portion 3100 includes a display panel 3400. Electronic device 3000 includes an operation unit provided with operation buttons and the like, but the operation unit is omitted in FIG. 25 for the sake of simplicity. Examples of the electronic device 3000 include portable electronic devices (portable game machines, personal digital assistants PDA: Personal-Digital-Assistants or Personal-Data-Assistants, electronic notebooks, portable personal computers, notebook personal computers, etc.) And portable wireless terminals (cell phones, PHS, wireless built-in PDAs, wireless built-in small computers, etc.). Although not shown in the first device portion 3100, a first substrate is provided, and the second device portion 3200 is provided with a second substrate (not shown).
For example, when signal transmission is required between the first substrate of the first device portion 3100 and the second substrate of the second device portion 3200, the device such as the electronic device 3000 transmits the signal. A transmission line for transmission passes through the connection portion 3300. Depending on the shape of the connection portion 3300, a space for providing a transmission line in the connection portion 3300 may not be sufficiently secured. For example, this is particularly noticeable when the connecting portion 3300 is formed of a movable part. Further, as the amount of information transmitted between the first device portion 3100 and the second device portion 3200 increases, the aforementioned space problem becomes more prominent. However, since the flexible substrate 10 and the like according to the present embodiment can be freely designed in the shape of the wiring portion AR3, for example, it can be easily mounted on the electronic device 3000, for example. Therefore, a case where the flexible substrate 10 is mounted on the electronic device 3000 will be described below.
FIG. 26 is a schematic side view of the electronic device 3000 of FIG. 25 as viewed from the direction DR9. For example, when the flexible substrate 10 is provided in the electronic device 3000, the first portion AR1 of the flexible substrate 10 (the portion where the first device DV1 is provided) may be provided in the first device portion 3100 of the electronic device 3000, for example. it can. Furthermore, the second portion AR2 of the flexible substrate 10 (the portion where the second device DV2 is provided) can be provided in the second device portion 3200 of the electronic device 3000, for example. Further, the wiring portion AR3 can be provided in the connection portion 3300.
Next, a partially cutaway side view of the electronic apparatus 3000 provided with the flexible substrate 10 is shown in FIG. The first device portion 3100 is provided with a first substrate 3001, and the first substrate 3001 is connected to the first terminal P 1 of the flexible substrate 10. Similarly, the second device portion 3200 is provided with a second substrate 3002, and the second substrate 3002 is connected to the second terminal P 2 of the flexible substrate 10. As shown in FIG. 27, the wiring portion AR3 can be provided in the connection portion 3300 by, for example, one winding. Since the wiring portion AR3 is a flexible substrate, the wiring portion AR3 has flexibility, and the mounting method as shown in FIG. 27 and the wiring portion AR3 can be twisted. It is also possible to mount the flexible substrate 10 on the electronic device 3000 without winding the wiring part AR3 or applying a twist.
Note that although the electronic device 3000 shown in FIG. 25 is configured to be foldable with the connection portion 3300 as an axis, the connection portion 3300 includes a movable part, the invention is not limited to this. In addition, although the display panel 3400 is provided in the first device portion 3100, a configuration in which the display panel 3400 is not provided in the first device portion 3100 is also possible.
Although the electronic device 3000 has a shape that can be folded at the connection portion 3300, the flexible substrate 10 according to the present embodiment and the flexible substrates 30 to 70 of the modification thereof are also used for electronic devices having different shapes of the connection portion 3300. Examples are given below as they are applicable. In addition, in FIG. 28 and FIG. 29 shown below, the outline of each electronic device is shown, and operation buttons and the like are omitted.
The electronic device 4000 shown in FIG. 28 includes a first device portion 4100, a second device portion 4200, and a connection portion 4300. The first device part 4100 or the second device part 4200 is rotatable about the center point MP of the connection part 4300 as shown in the direction DR10. In the connection part 4300 of the electronic device having such a configuration, a space for providing the wiring part AR3 and the like is extremely limited. However, the flexible substrate 10 according to the present embodiment and the flexible substrates 30 to 70 of the modified example can be provided in the electronic device 4000 as well. In this case, the first device portion 4100 of the electronic device 4000 is provided with, for example, the first portion AR1 of the flexible substrate 10, and the second device portion 4200 of the electronic device 4000 is provided with, for example, the second portion of the flexible substrate 10. Portion AR2 is provided. For example, the wiring portion AR3 of the flexible substrate 10 is provided in the connection portion 4300 of the electronic device 4000.
An electronic device 5000 shown in FIG. 29 includes a first device portion 5100, a second device portion 5200, a connection portion 5300, and a connection portion 5400. The first device portion 5100 or the second device portion 5200 can be folded at the connection portion 5300 in the same manner as the electronic device 3000 in FIG. Specifically, the first and second device portions 5100 and 5200 can be folded with the central axis CA1 of the connection portion 5300 as the central axis. Further, the first device portion 5100 is rotatable at the connection portion 5400 with the central axis CA2 as the central axis as shown in the direction DR11. In such an electronic device, since there are a plurality of connection portions such as the connection portions 5300 and 5400, a space for providing the wiring portion AR3 and the like is extremely limited. However, the flexible substrate 10 according to the present embodiment and the flexible substrates 30 to 70 of the modified example can also be provided in the electronic device 5000. In this case, the first device portion 5100 of the electronic device 5000 is provided with, for example, the first portion AR1 of the flexible substrate 10, and the second device portion 5200 of the electronic device 5000 is provided with, for example, the second portion of the flexible substrate 10. Portion AR2 is provided. And the wiring part AR3 of the flexible substrate 10 is provided in the connection parts 5300 and 5400 of the electronic device 5000, for example.
As described above, in various electronic devices, the flexible substrate 10 according to the present embodiment and the wiring part AR3 of the flexible substrates 30 to 70 according to the modification can be provided in a connection part including a movable part.
In the flexible substrate 10 according to the present embodiment and its modification, data transfer is performed using a differential signal. As another modification, serial data transfer is performed by a single-ended (single-ended) method. You may go. Specifically, for example, a device on the data transmission side generates a signal using a constant current source, and transmits the signal to the device on the data reception side through, for example, one signal line. The device on the data receiving side receives the transmitted signal, converts the signal into a voltage, compares it with a reference voltage, and outputs the result as a logic level signal. The flexible substrate according to this embodiment can also be applied when transmitting a signal generated by such a single-ended data transfer control device. In this case, a single-ended data transfer control device may be provided in the first and second devices DV1 and DV2 of the first and second portions AR1 of the flexible substrate. Even when a single-ended data transfer control device is provided, signal degradation, which is an effect of the flexible substrate of this embodiment, can be reduced. Further, since the number of signal lines can be reduced, the degree of freedom in designing the wiring portion AR3 can be expanded.
The present invention is not limited to the one described in the above embodiment, and various modifications can be made. For example, terms cited as broad or synonymous terms in the description in the specification or drawings can be replaced with broad or synonymous terms in other descriptions in the specification or drawings.
1 is an overall view of a flexible substrate according to an embodiment. The block diagram which shows the outline of the 1st data transfer apparatus of this embodiment, the 2nd data transfer control apparatus 1, and a wiring part. The figure which shows the connection relation of the 1st data transfer control apparatus of this embodiment, a 1st differential signal line, and a 2nd data transfer control apparatus. The figure which shows the connection of each data transfer control apparatus and 1st differential signal line in case the 1st, 2nd data transfer control apparatus transfers a differential signal by a voltage drive system. Sectional drawing which shows the cross section of the wiring part of FIG. The figure which shows a part of circuit of a target. The schematic side view of the flexible substrate of FIG. The figure of the comparative example which concerns on this embodiment. The schematic side view of the board | substrate of FIG. 8, and a flexible substrate. The figure which shows the comparative example which concerns on this embodiment. The block diagram explaining the data transfer process of the 1st, 2nd data transfer control apparatus in this embodiment. The block diagram which shows the outline | summary of an example of the system containing the flexible substrate which concerns on this embodiment. The figure which shows the cross-section of the modification which concerns on this embodiment. Schematic which shows the flexible substrate which is the other modification which concerns on this embodiment. Sectional drawing which shows the cross section of FIG. Sectional drawing of the flexible substrate which is a modification of the flexible substrate of FIG. The figure which shows the form which connects an application processor, a main panel, and a sub panel using the flexible substrate of FIG. The figure which shows the form which connects an application processor and an imaging device using the flexible substrate of FIG. It is a figure which shows the form which connects a main panel and an imaging device, and an application processor using the flexible substrate of FIG. Schematic which shows the flexible substrate which is the other modification of a flexible substrate. The partial side view of the part in which the 1st data transfer control apparatus of a board | substrate and a flexible substrate is provided. Schematic which shows the flexible substrate which is the other modification of a flexible substrate. Schematic which shows the board | substrate which connected the flexible substrate. The schematic side view of the board | substrate of FIG. The schematic perspective view which shows the whole small electronic device with which the display panel is mounted. The schematic side view of the electronic device of FIG. The partial notch side view of the electronic device provided with the flexible substrate. FIG. 6 is a schematic overall view showing another small electronic device on which a display panel is mounted. FIG. 6 is a schematic overall view showing another small electronic device on which a display panel is mounted.
10 flexible substrates, 12 insulators, 20 flexible substrates, 28 substrates,
30 flexible substrate, 40 flexible substrate, 50 flexible substrate,
60 flexible substrate, 70 flexible substrate,
100 first data transfer control device, 121 input / output impedance variable circuit,
122 input / output impedance variable circuit, 200 second data transfer control device,
3000 electronic equipment, 3001 first substrate, 3002 second substrate,
3100 1st equipment part, 3200 2nd equipment part, 3300 connecting part,
4000 electronic equipment, 4100 first equipment part, 4200 second equipment part,
4300 connection part, 5000 electronic equipment, 5100 first equipment part,
5200 Second equipment part, 5300 connection part, 5400 connection part AR1 first part, AR2 second part, AR3 wiring part, CD1 first conductor,
CD2 second conductor, CD3 third conductor, CD4 fourth conductor,
CN3 connection part for connecting to the first terminal,
CN4 connection portion for connecting to the second terminal, DR1 first direction,
DS1 first differential signal line, DS2 second differential signal line, DSP differential signal line pair,
DV1 first device, DV2 second device, H thickness of wiring,
P1 first terminal, P2 second terminal, PS1 first device signal line,
PS2 Second device signal line, S1 signal line, T insulator thickness, W wiring width,
Z1 characteristic impedance, Z2 characteristic impedance
A flexible substrate on which the device is mounted,
A first portion provided with a first device;
A second portion provided with a second device;
A wiring part provided between the first part and the second part, wherein a plurality of wirings for connecting the first device and the second device are provided;
The first device includes at least a first data transfer control device;
The second device includes at least a second data transfer control device;
The first and second data transfer control devices perform data transfer using differential signals (Differential-Signals),
A plurality of wirings provided in the wiring part for connecting the first device and the second device include at least one differential signal line pair for data transfer using the differential signal. ,
At least one of the first device and the second device is:
Two input / output impedance variable circuits respectively connected to each of the differential signal line pairs and configured to vary an input / output impedance of the at least one device according to a characteristic impedance of the differential signal line pair;
Two current-voltage conversion circuits for current-voltage conversion based on outputs from the two input / output impedance variable circuits;
A comparator for comparing outputs from the two current-voltage conversion circuits;
Each of the two input / output impedance variable circuits is:
A variable resistor having one end connected to the corresponding differential signal line of the differential signal line pair;
An N-type transistor having a source connected to the other end of the variable resistor and a drain connected to the current-voltage conversion circuit;
An inverter having one end connected to the other end of the variable resistor and the other end connected to the gate of the N-type transistor;
When a direction in which a plurality of wirings connecting the first device and the second device are extended and formed is a first direction,
In the wiring portion, a first conductor extends in the first direction in a lower layer of the wiring portion, and an insulator extends in the first direction in an upper layer of the first conductor. A flexible board formed by forming the plurality of wirings on the insulator.
Characteristic impedance determination parameters that determine the characteristic impedances of the first and second differential signal lines constituting the differential signal line pair are the wiring width and wiring thickness of each of the first and second differential signal lines. Including the parameters of the length of the wiring, the thickness of the insulator and the dielectric constant of the insulator,
The first and second differential impedance lines are impedance matched so that the characteristic impedance of each of the first and second differential signal lines and the input / output impedance of at least one of the first device and the second device match. A flexible substrate, wherein at least one of the characteristic impedance determination parameters of the differential signal line is set.
The plurality of wirings include a plurality of differential signal line pairs,
The plurality of differential signal pairs are formed on the insulator;
A flexible substrate, wherein a second conductor extends along the first direction between each of the plurality of differential signal line pairs on the insulator.
In the wiring portion, a third conductor extends in the first direction in the lower layer of the wiring portion, and an insulator extends in the first direction in the upper layer of the third conductor. A flexible substrate formed by forming a fourth conductor on the insulator and forming the plurality of wirings in the insulator.
In the wiring portion, an insulator extends along the first direction, and the plurality of wirings are formed on the insulator,
On the insulator, between each of the plurality of differential signal line pairs, a second conductor is formed extending along the first direction,
A plurality of signal lines other than the first and second differential signal lines constituting the differential signal line pair are formed below the insulator and on the side where the plurality of wirings are not formed. A flexible substrate characterized by having
Each of the plurality of signal lines is wired to the insulator so as to be disposed below the second conductor.
Each of the two input / output impedance variable circuits includes an impedance setting register in which impedance setting information is written,
Each of the two input / output impedance variable circuits sets an input / output impedance of the at least one device based on the impedance setting information of the impedance setting register.
A flexible substrate, wherein a device other than a data transfer control device is integrated in at least one of the first device and the second device.
In any one of Claims 1 thru | or 10.
A first terminal to which a first device signal line connected to the first device is connected;
A second terminal to which a second device signal line connected to the second device is connected;
A flexible substrate characterized in that is provided.
A flexible substrate according to any one of claims 1 to 11, comprising:
A first device portion provided with the first portion of the flexible substrate;
A second device portion provided with the second portion of the flexible substrate;
A device connecting portion for connecting the first device portion and the second device portion;
The electronic device, wherein the wiring portion of the flexible substrate is provided in the device connection portion.
A flexible substrate according to claim 11;
A first substrate connected to the first terminal of the flexible substrate;
A second substrate connected to the second terminal of the flexible substrate;
A substrate provided with a connecting portion for connecting to the first terminal and a connecting portion for connecting to the second terminal;
JP2004070990A 2004-03-12 2004-03-12 Flexible substrate and electronic device Expired - Fee Related JP3804665B2 (en)
JP2004070990A JP3804665B2 (en) 2004-03-12 2004-03-12 Flexible substrate and electronic device
US11/077,392 US7456701B2 (en) 2004-03-12 2005-03-10 Flexible substrate and electronic equipment
JP2005260066A JP2005260066A (en) 2005-09-22
JP3804665B2 true JP3804665B2 (en) 2006-08-02
JP2004070990A Expired - Fee Related JP3804665B2 (en) 2004-03-12 2004-03-12 Flexible substrate and electronic device
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2005-12-17 A871 Explanation of circumstances concerning accelerated examination
2006-01-13 A975 Report on accelerated examination
2006-03-25 RD03 Notification of appointment of power of attorney