Patent Publication Number: US-10762863-B2

Title: Device and method of driving display panel

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is the US national stage application of PCT International Application No. PCT/CN2018/118444, which was filed Nov. 30, 2018 and claimed priority to Chinese Patent Application No. 201811056953.4, filed on Sep. 11, 2018. The content of Chinese Patent Application No. 201811056953.4 is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure pertains to the field of display technology, and more particularly to a device of a driving a display panel and a method of driving a display panel. 
     BACKGROUND 
     The statements herein only provide background information related to the present disclosure without necessarily constituting the prior art. TFT-LCD (Thin Film Transistor Liquid Crystal Display) has the advantages of low cost, low power consumption and high performance, and has been widely used in the fields such as electronics, digital products and so on. However, driving of the pixel units in the display panel needs to be implemented by using a gate drive circuit and a source drive circuit to drive corresponding scanning line and data line. With the improvement of the requirements of size, resolution, large view angle and image quality of the display panel, user experience is further improved, the cost is further saved, various manufacturers have developed a lot of manufacturing technologies related to the display field. 
     In the display panel, due to the influence of capacitive coupling effect, when the TFT (Thin Film Transistor) is closed and turned off, a voltage stability of data signal is influenced, and the image quality is further influenced; thus, it needs to perform a wave clipping on VGH (Voltage Gate High) of TFT so as to reduce a voltage difference between the VGH and VGL (Voltage Gate Low) of the TFT when the TFT is turned off, and to reduce the influence of the voltage of the data signal. For example, a resistance grounding discharge method is adopted to achieve the purpose of wave clipping, one end of a clipping resistance is connected with a power supply integrated circuit and the other end of the clipping resistance is grounded; the VGH generated by the power supply integrated circuit is discharged through the clipping resistance to form a clipped voltage waveform. The clipped voltage waveforms formed by the VGH are also the same for the clipping resistances having the same resistance value. Due to the fact that a clipped voltage waveform may influence pixel charging time and cause a horizontal block phenomenon (i.e., horizontal block is poor), for this reason, the clipped voltage waveform of the VGH needs to be controlled, so that the influence on pixel charging time is reduced and the horizontal block phenomenon is avoided; thus, clipping resistances need to be changed continuously in order to find an optimal resistance having the minimum influence on pixel charging time, this method needs many times of repetitive operation, is relatively tedious, and has a low working efficiency. 
     SUMMARY 
     An object of the present disclosure is to provide a device of driving a display panel, which solves technical problems including but is not limited to a technical problem that due to the influence of capacitance coupling effect, a voltage stability of data signal is influenced and image quality is further affected when TFT is closed and turned off. 
     In order to solve the aforesaid technical problem, a technical solution adopted by the embodiment of the present disclosure is as follows: 
     a device of driving a display panel, including: 
     a control circuit; 
     a memory circuit configured to be coupled with the control circuit, and store and output a plurality of resistance control data; 
     a timing circuit configured to be coupled with the control circuit; and 
     a resistance circuit configured to be coupled with the control circuit and including a resistance controller; 
     where the control circuit is configured to read the resistance control data in the memory circuit and output the resistance control data to the timing circuit and the resistance circuit, and the resistance circuit is configured to adjust its own resistance according to the received resistance control data. 
     In some embodiments, the timing circuit is configured to start timing and sent a timing termination signal to the control circuit, when the resistance circuit adjusts its own resistance according to the received resistance control data. 
     In some embodiments, the resistance control data includes resistance value data and timing data. 
     In some embodiments, the timing circuit is configured to receive the timing data and perform timing, and output a feedback signal to the control circuit simultaneously. 
     In some embodiments, the resistance controller is coupled with a plurality of switches and each switch is correspondingly coupled with a resistance. 
     In some embodiments, at least one of the switches is turned off, so that at least one of the resistance circuits is conductive. 
     In some embodiments, one of the switches is turned off, so that the resistance in the resistance circuit is conductive. 
     In some embodiments, the resistance controller is configured to turn off the corresponding switch according to the resistance value data. 
     In some embodiments, the resistance controller and the switches are in an off state before the display panel is actuated. 
     In some embodiments, the resistance controller is coupled with the corresponding resistance respectively through a coupling element. 
     In some embodiments, the coupling element further includes a protection element. 
     In some embodiments, the protection element is any one of a fuse, a fusing resistance, a temperature control semiconductor element and a thermosensitive semiconductor element. 
     In some embodiments, the timing circuit is configured to restart timing, when the resistance control data read by the control circuit is changed. 
     In some embodiments, a device of driving a display panel includes: 
     a control circuit; 
     a memory circuit configured to be coupled with the control circuit, and store and output a plurality of resistance control data; 
     a timing circuit configured to be coupled with the control circuit; 
     a resistance circuit configured to be coupled with the control circuit and including a resistance controller; and 
     a plurality of switches configured to enable the resistance controller to be coupled with each resistance respectively; 
     where the control circuit is configured to read the plurality of resistance control data in the memory circuit and output the resistance control data to the timing circuit and the resistance circuit; the resistance circuit is configured to receive the resistance control data and adjust its own resistance value according to the received resistance control data; 
     the control circuit is configured to control the resistance circuit to turn off one or more of the plurality of switches to enable at least one resistance in the resistance circuit to be conductive, so that the resistance circuit has different resistance value corresponding; 
     the timing circuit is configured to restart timing when the resistance control data read by the control circuit is changed. 
     Another object of the present disclosure is to provide a method of driving a display panel, including: 
     setting a control circuit; 
     setting a memory circuit which is configured to be coupled with the control circuit, and store and output a plurality of resistance control data; 
     setting a timing circuit which is configured to be coupled to the control circuit; setting a resistance circuit which is configured to be coupled with the control circuit and comprises a resistance controller; 
     where the control circuit is configured to read the resistance control data in the memory circuit and output the resistance control data to the timing circuit and the resistance circuit; the resistance circuit is configured to receive the resistance control data and adjust its own resistance value according to the received control data; 
     where the resistance controller is coupled with a plurality of switches and each of the switches is coupled with a corresponding resistance respectively; the control circuit is configured to control the resistance circuit to turn off one or more switches in the plurality of switches to enable one or more resistances in the resistance circuit to be conductive, so that the resistance circuit has a corresponding resistance value. 
     In some embodiments, the method of driving display panel further includes: 
     restarting timing via the timing circuit when the resistance control data read by the control circuit is changed. 
     In some embodiments, the method of driving display panel further includes: 
     configuring the timing circuit to start timing and transmitting a timing termination signal to the control circuit when the resistance circuit adjusts its own resistance according to the received resistance control data. 
     In some embodiments, the resistance control data includes resistance value data and timing data; and the timing circuit is configured to receive the timing data and perform timing, and output a feedback signal to the control circuit simultaneously. 
     In some embodiments, the method of driving display panel further includes: 
     setting the resistance controller and the switches as in an off state before the display panel is actuated. 
     In some embodiments, the method of driving display panel further includes: 
     coupling the resistance controller with the corresponding resistances respectively through a coupling element. 
     In the device and method of driving display panel provided by the embodiments of the present disclosure, according to the design of the clipping circuit, a voltage waveform clipping approach may be improved, and using the same circuit to output various different clipped voltage waveforms may be implemented, the number of clipping resistances is saved, and the voltage waveform needs not to be adjusted through a welding resistance, the efficiency of displaying is improved, and the cost of the display panel is saved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to explain this embodiments of the present disclosure more clearly, a brief introduction regarding the accompanying drawings that need to be used for describing the embodiments is given below; it is obvious that the accompanying drawings described as follows are only some embodiments of the present disclosure, for ordinarily skilled one in the art, other drawings can also be obtained according to the current drawings on the premise of paying no creative labor. 
         FIG. 1  illustrates a circuit diagram of a clipping circuit configuration provided by an embodiment of the present disclosure; 
         FIG. 2  illustrates a schematic diagram of clipped voltage waveform provided by an embodiment of the present disclosure; 
         FIG. 3  illustrates another circuit diagram of the clipping circuit configuration provided by an embodiment of the present disclosure; 
         FIG. 4  illustrates another schematic diagram of the clipped voltage waveform provided by an embodiment of the present disclosure; and 
         FIG. 5  illustrates another circuit diagram of the clipping circuit configuration provided by an embodiment of the present disclosure. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     In order to make the purpose, the technical solution and the advantages of the present disclosure be clearer and more understandable, the present disclosure is further described in detail below with reference to accompanying figures and embodiments. It should be understood that the specific embodiments described herein are merely intended to illustrate but not to limit the present disclosure. 
     It should be noted that, when one component is described to be “fixed to” or “arranged on” another component, this component may be directly or indirectly arranged on another component. When one component is described to be “connected with” another component, it may be directly or indirectly connected to the other component. Orientation or position relationships indicated by terms including “upper”, “lower”, “left” and “right” are based on the orientation or position relationships shown in the accompanying figures and is only used for the convenience of description, instead of indicating or implying that the indicated device or element must have a specific orientation and is constructed and operated in a particular orientation, and thus should not be interpreted as limitation to the present disclosure. For the person of ordinary skill in the art, the specific meanings of the aforesaid terms may be interpreted according to specific conditions. Terms of “the first” and “the second” are only for the purpose of describing conveniently and should not be interpreted as indicating or implying relative importance or impliedly indicating the number of indicated technical features. “Multiple/a plurality of” means two or more unless there is an additional explicit and specific limitation. 
       FIG. 1  illustrates a schematic diagram of a clipping circuit configuration provided by an embodiment of the present disclosure. 
       FIG. 2  illustrates a schematic diagram of a clipped voltage waveform provided by an embodiment of the present disclosure. 
     Referring to  FIG. 1  and  FIG. 2 , an exemplary clipping circuit configuration  100  includes: 
     an integrated control chip  110  and a clipping resistance  120 . 
     One end of the clipping resistance  120  is coupled with the integrated control chip  110 , the other end of the clipping resistance  120  is grounded. A VGH (Voltage Gate High) is generated by the integrated control chip  110 , and a clipped voltage ΔV (as shown in  FIG. 2 ) is generated after the VGH passes through the clipping resistance  120 . Where, clipped voltage waveforms formed by the VGH are also the same for those clipping resistances having the same resistance value. Due to the fact that the clipped voltage waveform may influence pixel charging time and cause a horizontal block phenomenon (i.e., the horizontal block is poor), thus, the clipped voltage waveform generated by the VGH needs to be controlled, so that the influence on the pixel charging time is reduced and the horizontal block phenomenon is avoided. 
       FIG. 3  illustrates another schematic diagram of a clipping circuit configuration provided by an embodiment of the present disclosure. 
       FIG. 4  illustrates another schematic diagram of a clipping voltage waveform provided by an embodiment of the present disclosure. 
     Referring to  FIG. 3  and  FIG. 4 , In some embodiments, a device  200  of driving a display panel includes: 
     a control circuit  210 ; 
     a memory circuit  220  configured to be coupled with the control circuit  210  and store and output a plurality of resistance control data; 
     a timing circuit  230  configured to be coupled with the control circuit  210 , perform timing and output a feedback signal; 
     a resistance circuit  240  configured to be coupled with the control circuit  210 ; where the control circuit  210  is configured to read the resistance control data in the memory circuit  220  and output the resistance control data to the timing circuit  230  and the resistance circuit  240 ; the resistance circuit  240  is configured to adjust its own resistance according to the received resistance control data. 
     In some embodiments, when the resistance circuit  240  adjusts its own resistance according to the received resistance control data, the timing circuit  230  is configured to start timing and transmit a timing termination signal to the control circuit  210 ; In some embodiments, the resistance control data includes resistance value data and timing data. 
     In some embodiments, the timing circuit  230  is configured to receive the resistance control data and perform timing, and output a feedback signal to the control circuit  210  simultaneously. 
     In some embodiments, the resistance controller  241  is enabled to be coupled with each resistance  242  respectively through a plurality of switches  243 . 
     In some embodiments, at least one of the switches  243  is turned on, so that at least one resistance  242  in the resistance circuit  240  is conductive. 
     In some embodiments, one of the switches  243  is turned on, so that the corresponding resistance  242  in the resistance circuit  240  is conductive. 
     In some embodiments, when different switches  243  are closed, the resistance value of the resistance circuit  240  is also different. In some embodiments, a switch  243  configured to connect a digital resistance controller  241  with the resistance  242  is disconnected before the display panel is actuated. 
     In some embodiments, when the display panel is actuated, the control circuit  210  reads the resistance control data stored in the memory circuit  220  to obtain the required timing data and resistance value data corresponding to the timing data, and output the timing data and the resistance value data to the timing circuit  230  and the resistance controller  241  respectively. 
     In some embodiments, the resistance controller  241  turns off the corresponding switch  243  according to the received resistance data, so that the total resistance value of the resistance circuit  240  is equal to the resistance value data as output by the control circuit  210 . 
     In some embodiments, when the resistance control data read by the control circuit  210  is changed, the resistance control data is output to the timing circuit  230  and the resistance circuit  240  respectively, the timing circuit  230  restarts timing, and the resistance circuit  240  changes its own resistance value simultaneously. 
     Referring to  FIG. 3  and  FIG. 4 , in some embodiments, the device  200  of driving display panel enables the voltage waveform of the output voltage (i.e., the voltage gate high) to be bevel, which is shown in  FIG. 4 . An adjustment range of the output voltage waveform may be such as a range between two dotted lines shown in  FIG. 4 ; where a waveform  310  is an exemplary output voltage waveform which is within the adjustment range. The adjustment range of the output voltage waveform of  FIG. 4  is merely illustrative and is not intended to limit the size or the area of the adjustment range, the adjustment range is determined by the design of the designer. 
       FIG. 5  illustrates another schematic diagram of the clipping circuit configuration according to an embodiment of the present disclosure. 
     Referring to  FIG. 5  and  FIG. 4 , in some embodiments, a device  300  of driving display panel includes: 
     a control circuit  210 ; 
     a memory circuit  220  configured to store a plurality of resistance control data and is coupled with the control circuit  210 ; 
     a timing circuit  230  configured to be coupled with the control circuit  210 ; 
     a resistance circuit  240  configured to be coupled with the control circuit  210  and including a resistance controller  241 ; where the control circuit  210  is configured to read the resistance control data of the memory circuit  220  including resistance value data and timing data, and output the resistance value data and the timing data to the resistance circuit  240  and the timing circuit  230  respectively. 
     In some embodiments, the resistance circuit  240  changes its own resistance value, the timing circuit  230  starts timing and transmits a feedback signal to the control circuit  210 ; when the control circuit  210  receives the feedback signal indicating that current timing is stopped, the next set of resistance control data is read and is output to the resistance circuit  240  and the timing circuit  230  respectively; the resistance circuit  240  changes its own resistance value and the timing circuit  230  restarts timing. 
     In some embodiments, the resistance control data includes resistance value data and timing data. 
     In some embodiments, the timing circuit is configured to receive the resistance control data and perform timing, and output the feedback signal to the control circuit simultaneously. 
     In some embodiments, referring to  FIG. 5 , two ends of the resistance circuit  242  is grounded (not shown) before the display panel is actuated, switches in the switch circuit  243  are disconnected; when the display panel is actuated, referring to  FIG. 5 , the control circuit  210  outputs the resistance control data to the resistance controller  241 , the resistance controller  241  outputs an instruction of closing the coupling element  2531 , the remaining coupling elements are still in an off state; at this moment, the resistance is divided into a first part resistance and a second part resistance; where an equivalent resistance value of the first part resistance  2521  is R1, an equivalent resistance value of the second partial resistance is R2, at this time, the equivalent resistance value of the resistance circuit  252  is formulated as R1*R2/(R1+R2). 
     In some embodiments, the resistance controller  241  is enabled to be coupled with each resistance  252  respectively through a plurality of coupling elements  253 . 
     In some embodiments, the resistance controller  241  is communicated with the resistance  252  by closing one of the plurality of coupling elements  253 , so that the resistance circuit  240  has corresponding different resistance value. 
     In some embodiments, the control circuit  210  controls the corresponding coupling element  253  to be closed according to the read resistance value data and adjusts the resistance value of the resistance  252  to be the same as or similar to the resistance value. 
     In some embodiments, the coupling element  253  may include a protection element which may be any one of a fuse, a temperature control semiconductor element and a thermosensitive semiconductor element, a stability of the driving device of the display panel may be improved by setting the protection element. 
     In some embodiments, the timing circuit  230  is configured to restart timing when the resistance control data read by the control circuit  210  is changed. 
     The memory circuit  220  may be an internal storage unit of the display device, such as a hard disk or a memory of the display device. The memory circuit  220  may also be an external storage device of the display device, such as a plug-in hard disk, a SMC (Smart Media Card), a SD (Secure Digital) card, a FC (Flash Card) equipped on the display device. 
     Further, the memory circuit  220  may also include the internal storage unit and the external storage device of the display device  10 . 
     In some embodiments, the memory circuit  220  is configured to store computer program and other programs and data needed by the display device. 
     In some embodiments, the memory circuit  220  may also be configured to temporarily store data that has been output or is ready to be output. 
     The so called control circuit  210  may be CPU (Central Processing Unit), and can also be other general purpose processor, DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FGPA (Field-Programmable Gate Array), or some other programmable logic devices, discrete gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor, or alternatively, the processor may also be any conventional processor and so on. 
     Referring to  FIGS. 3-5 , In some embodiments, the embodiment of the present disclosure provides a method of driving a display panel, including: 
     setting a control circuit  210 ; 
     setting a memory circuit  220  which is configured to be coupled with the control circuit  210  and store and output a plurality of resistance control data; 
     setting a timing circuit  230  which is coupled with the control circuit  210 ; 
     setting a resistance circuit  240  which is configured to be coupled with the control circuit  210  and includes a resistance controller  241 ; 
     The control circuit  210  is configured to read the resistance control data stored in the memory circuit  220 , and output the resistance control data to the timing circuit  230  and the resistance circuit  240 ; 
     The resistance circuit  240  is configured to adjust its own resistance value according to the received resistance control data; where the resistance controller is coupled with a plurality of switches, and each of the switches is correspondingly coupled with each resistance respectively; the control circuit  210  is configured to control the resistance circuit to close one or more switches in the plurality of switches to enable all or some resistances  252  in the resistance circuit  240  to be conductive, so that the resistance circuit has corresponding different resistance value. 
     In some embodiments, the control circuit  210  is configured to control the switch  243  to be closed and adjust the resistance value of the resistance  252  into the same as or similar to the resistance value according to the read resistance value data. 
     In some embodiments, the control circuit  210  is configured to control the corresponding coupling element  253  to be closed and adjust the resistance value of the resistance  252  into the same as or similar to the resistance value data according to the read resistance value data. 
     In some embodiments, the control circuit  210  is configured to control the resistance controller  241  to close one or more switches in the switches  243  or close one or more switches in the coupling element  253  according to the resistance value data. 
     In some embodiments, the method of driving display panel further includes: 
     a resistance circuit is configured to start timing and transmit a timing termination signal to the control circuit when the resistance circuit adjusts its own resistance according to the received resistance control data. 
     In some embodiments, the resistance control data includes resistance value data and timing data; 
     the timing circuit is configured to receive the timing data and perform timing, and output a feedback signal to the control circuit simultaneously. 
     In some embodiments, the driving method further includes: 
     setting the resistance controller and the switch as disconnected before the display panel is actuated. 
     In some embodiments, the method of driving display panel further includes: 
     coupling the resistance controller with the corresponding resistance respectively through the coupling element  253 . 
     In some embodiments, the display panel of the present disclosure may be such as a LCD (Liquid Crystal Display) panel, however, the display panel of the present disclosure is not limited herein and may also be an OLED (Organic Light Emitting Diode) display panel, a W-OLED (White Light Emitting Diode) display panel and a QLED (Quantum Dot Light Emitting Diode) display panel, a plasma display panel, a curved type display panel or other types of display panels. 
     According to the design of the clipping circuit, a voltage waveform clipping approach may be improved, and using the same circuit to output various different clipped voltage waveforms may be implemented, the number of clipping resistances is saved, and the voltage waveform needs not to be adjusted through a welding resistance, the efficiency of displaying is improved, and the cost of the display panel is saved. 
     The aforementioned embodiments are only optional embodiments of the present disclosure, and should not be regarded as being limitation to the present disclosure. Any modification, equivalent replacement, improvement, and the like, which are made within the spirit and the principle of the present disclosure, should all be included in the protection scope of the present disclosure.