Radio paging receiver

Abstract: A radio paging receiver to enable a user to readily and quickly access desired display information even when received display information cannot be displayed at one time. The receiver includes an optical coordinate information reader such as an optical mouse. The information reader has light emitting source of two different wavelengths and light receiving lens for detecting the lights of the two different wavelengths. Also, a plate having two different non-reflective patterns is provided. One of the pattern is non-reflective to one of the two wavelengths, and another pattern is non-reflective to another wavelength. Therefore, when the user puts and moves the receiver on the plate, the receiver can detect a direction and an amount of the moving by detecting reflected light by the plate. Whereby, the receiver shifts the display position in the total received display information.

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio paging receiver with a display function and simplified control of the positioning of information on the display screen. 2. Description of the Related Art To better understand the present invention, a brief reference will be made to a prior art radio paging receiver having, for example, an LCD display. In prior art radio paging receivers with a display function the display size is limited to facilitate transportability. As illustrated in Fig. 1, the quantity Q1 of information that can be displayed at one time on the LCD display of a pager is limited while there has been an increase in the total quantity Q of information received by radio paging receivers and stored therein. For this reason, as shown in Fig. 2, it becomes necessary to perform control so as to shift the information displayed on the LCD and enable all the message information stored in the pager to be displayed. Namely, the read position in the information memory of the pager storing the information to be displayed must be shifted in the horizontal direction A and vertical direction B to move the read position from P1 to the desired storage position P2. Fig. 3 is a block diagram illustrating the configuration of a prior art radio paging receiver with a display function. In Fig. 3, message signal is received by a radio section 2 via an antenna 1 and sent to a decoder 3. When the decoder 3 detects that an address contained in the received message signal is coincident with an address stored in the decoder 3, the decoder 3 outputs an alert signal to an alert driver 5. The driver 5 drives a speaker 6 or a vibrator 7 to generating an alert according to selection of an user. Further, by a command of a CPU 8, the received information contained in the received signal is displayed on an LCD 11 through an LCD driver 10. Also, scroll keys 4, a memory 9 and a reset switch 13 are connected to the CPU 8. According to this prior art, the control to shift the information displayed on the LCD 11 vertically and horizontally with respect to the information stored in the pager memory was achieved by turning ON and OFF the scroll keys 4. When one of the scroll keys 4 is in an ON state, a "01" signal is repeated, the number of that "01" signal (this number corresponds to bit number) is read in by the LCD driver 10 under the control of the CPU 8, and display information is controlled by a command of the CPU 8 in such a way that so much shifting should be accomplished at so many bits. Therefore, as shown in Fig. 2, shifting in the horizontal direction is controlled with scroll keys for the horizontal direction, and shifting in the vertical direction is controlled with other scroll keys for the vertical direction. Therefore, in order to find out which part of received information is the most important, the searching had to be accomplished by pressing the scroll keys for the horizontal direction and that for the vertical direction one at a time. This involved much trouble in operation, and posed a major problem to the access to information and the grasp of its total content. WO91/16771 describes a selective call radio receiver in which a voice message contained in a received signal is stored in a memory for subsequent playback on a display. The receiver includes at least one movement tracking device, either in the form of a knob on the side of the receiver or in the form of a ball located on the bottom of the receiver. The display includes a zoom window identifying a portion of the message. Upon activation of a "zoom-in" button, the portion of the message in the zoom window occupies the entire display. Different portions of the message may be shown by movement of the movement tracking device. US 4 364 035 describes an optical mouse for controlling a cursor on a display. A detector comprises a housing containing a light source and photodetector. The housing is gripped in the hand and pushed in any direction on a surface on which is formed a passive, position-related array of two groups of lines. A counter receives electrical signals from the photodetector, representing reflection from the lines, to count lines during detector motion over the surface to derive a position signal for the cursor. SUMMARY OF THE INVENTION An object of the present invention is to solve the aforementioned problem, and to provide a radio paging receiver with a display function which significantly simplifies the operation to display information and significantly facilitates the access to information and the grasp of its total content. According to a first aspect the present invention provides a radio paging receiver with a display function for receiving a radio signal including an address number and display information which may exceed the capacity of the display, the receiver comprising a display means, arranged on a first surface of said receiver, for displaying the display information, and characterised by further comprising an optical position sensor means, arranged on a second surface of said receiver opposite to said first surface, adapted to detect a direction in which the receiver is moved to detect which portion of the information is to be displayed on the display means when the display information exceeds the capacity of the display means, the portion of the information to be displayed being determined by the location of the information in a memory of said receiver, the optical position sensor means comprising a light emitting circuit for emitting light of two different wavelengths, a receiver circuit for receiving reflected light corresponding to the emitted light from said light emitting circuit, said reflected light being reflected by an optical reflective surface providing coordinate information, the optical reflective surface being provided on a plate upon which the receiver is placed to present the optical sensor means to the surface, said optical reflective surface comprising a grid pattern of reflective areas and non-reflective areas, said grid pattern comprising a first pattern of reflective areas and non-reflective areas for absorbing light of one wavelength and a second pattern of reflective areas and non-reflective areas for absorbing light of the other wavelength, wherein in said first pattern, the spacing between the non-reflective areas in a first direction is twice that between the reflective areas and in the second pattern, the spacing between the non-reflective areas in a second direction orthogonal to the first direction is twice that between the reflective areas, whereby the optical position sensor means optically reads and inputs coordinate information upon relative scanning movement between the optical position sensor means and the surface in a desired direction, said relative movement being produced by moving the receiver on the surface, and display control means for identifying said location in said memory to cause the information stored in a particular location to be displayed and for shifting the information displayed on the display means according to the input coordinate information corresponding to the relative scanning movement. A second aspect of the present invention provides a method of controlling a display arranged on a first surface of a radio paging receiver, the method comprising the step of receiving display information which exceeds the capacity of the display, and characterised by further comprising the steps of memorising said display information, providing an optically reflective surface which provides coordinate information in light reflected therefrom, the optical reflective surface being provided on a plate upon which the receiver is placed to present the optical sensor means to the surface, said optical reflective surface comprising a grid pattern of reflective areas and non-reflective areas, said grid pattern comprising a first pattern of reflective areas and non-reflective areas for absorbing light of one wavelength and a second pattern of reflective areas and non-reflective areas for absorbing light of the other wavelength, wherein in said first pattern, the spacing of the non-reflective areas in a first direction is twice that of the reflective areas and in the second pattern, the spacing of the non-reflective areas in a second direction orthogonal to the first direction is twice that of the reflective areas, irradiating the surface with light of two different wavelengths emitted from a second surface of said receiver opposite to said first surface so as to produce said coordinate information, producing relative movement between an optical position sensor means and said surface, said relative movement being produced by moving the receiver on the surface, detecting the direction and magnitude of the relative movement of the receiver and the surface by detecting light reflected by said surface, identifying memory locations in said memory to cause the information stored therein to be displayed, and shifting the information displayed on the display according to the coordinate information corresponding to the direction and magnitude of the relative movement detected in said detecting step. BRIEF DESCRIPTION OF THE DRAWINGS The above object and features of this invention will become more apparent from the following detailed description (which is by way of example only) taken in conjunction with the attached drawings. Fig. 1 shows the relationship between the quantity of display information and the total received information in the paging receiver with a display function; Fig. 2 represents the shifting of display information in a prior paging receiver with a display function; Fig. 3 is a block diagram of a prior art paging receiver; Fig. 4 is a block diagram of an embodiment of the present invention; Fig. 5 is a block diagram of the optical coordinate information reader of the optical position sensor of the embodiment; Fig. 6 is a perspective view of the optical coordinate information reader; Figs. 7A to 7C are diagrams for describing a pattern of the coordinate information plate; Figs. 8A and 8B show the concept for detecting the moving direction of the receiver; Fig. 9 is a flowchart for detecting the horizontal moving of the receiver; Fig. 10 is a flowchart for detecting the vertical moving of the receiver; Fig. 11 is a plan view showing an example of the use of the embodiment of Fig. 4; and Figs. 12A and 12B are flowcharts showing an operation of the embodiment of Fig. 4. Fig. 13 is a perspective view showing another arrangement of the optical coordinate information reader of the invention; Figs. 14A to 14C are diagrams for describing another pattern of the coordinate information plate; Figs. 15A and 15B show the concept for detecting the moving direction of the receiver; and Fig. 16 is a flowchart for detecting the vertical moving of the receiver; In the drawings, the same reference numerals denote the same structural elements. DESCRIPTION OF THE PREFERRED EMBODIMENT Next will be described the present invention with reference to drawings. The embodiment shown in Fig. 4 has a configuration provided with, in addition to an antenna 1, the radio section 2, the decoder 3, the alert driver 5, the loud speaker 6, the vibrator 7, the memory 9, the LCD driver 10, the LCD 11 and the reset switch 13 which are the same as in the configuration of the prior art shown in Fig. 3, a CPU 14 and an optical mouse coordinate information reader 12 which are directly relevant to the present invention. The information reader 12, as illustrated in Fig. 5, is provided with light receiving lens 121, a light receiving circuit 122, a light emitting circuit 123 and a light source 124. The information reader 12 works as an optical mouse for inputting coordinate information. As light source contained in the light emitting circuit 123, two LED's (Light Emitting Diodes) including an LED for horizontal control and another LED for vertical control are used, and the two LED's are varied in their color of light and wavelengths, serving the purpose of obtaining information on X and Y coordinates, respectively. In this case, one (wavelength W1) of the outgoing lights of the light emitting circuit 123 serves the purpose of obtaining information expressed by a coordinate information plate P corresponding to the X direction (the horizontal direction) of coordinate information, and the other (wavelength W2), that corresponding to the Y direction (the vertical direction). A concrete example of the information reader 12 is shown in Fig. 6 which is a perspective view of the bottom surface of the paging receiver 100 of the embodiment. In the information reader 12, arranged on the bottom surface of the receiver 100, two different light sources 124a and 124b and two different light receiving lenses 121a and 121b are arranged on the same surface. Each of the light sources 124a and 124b includes the above-mentioned two LED's having different wavelengths and are connected to the light emitting circuit 123. Also the lenses 121a and 121b are provided for guiding reflective lights to light receiving elements of the light receiving circuit 122 for receiving the reflected lights issuing from the outgoing lights from these light sources 124a and 124b. Namely, the information reader 12 has two pairs of light source and light receiving lens. Each pair can detect the reflected light of the above-mentioned two different wavelengths. Photodiodes are used as the receiving elements of the light receiving circuit 122. The outgoing lights coming incident at a right angle on a plate P shown in Fig. 5 from the light sources 124a and 124b of the light emitting circuit 123 are reflected by the plate P and detected by the light receiving elements through the light receiving lenses 121a and 121b. The plate P is formed to have a plurality of small areas in a grid pattern of reflective areas and non-reflective areas. Two different patterns are provided in the same plate P, one is for detecting the horizontal movement of the receiver 100, another is for detecting the vertical movement. Namely, the non-reflective area of the first pattern absorbs the light having the first wavelength, and the non-reflective area of the second pattern absorbs the light having the second wavelength. Therefore, if the output light of the light emitting circuit 123 irradiates the shaded non-reflective area, there will be no reception of light by the light receiving circuit 122, and no current will flow through the photodiodes, resulting in a "0" signal state. On the other hand, if the light emitting circuit 123 irradiates the reflective area, reflected light will be detected by the photodiodes of the light receiving circuit 122, and currents will flow, resulting in a "1" signal state. Therefore, the CPU 14 can recognize the moving direction of the receiver 100 on the plate P by detecting the combination of these signals. Next, an example of the pattern of the coordinate information plate P will be described referring to Figs. 7A to 7C. Figs. 7A and 7B respectively show the first pattern for horizontal direction detection and the second pattern for vertical direction detection. The white area is the reflective area, and the shaded area is the non-reflective area. Namely, the non-reflective area of the first pattern shown in Fig. 7A absorbs the light having the wavelength W1. Also, the non-reflective area of the second pattern (Fig. 7B) absorbs the second wavelength W2 light. Therefore, the actual plate P has the combined pattern with the first and second patterns as shown in Fig. 7C. The method for detection will be described referring to Figs. 8A to 10. As shown in Fig. 8A, assume that the information reader 12 shifts rightwardly as shown by arrow A1, the combination of the detected signals of the first wavelength W1 at two detecting points D1 and D2 changes. Three combinations of the detected signals are generated as the pager moves horizontally over the plate P. Therefore, the moving direction of the receiver 100 is detected by a flowchart shown in Fig. 9. On the other hand, as shown in Fig. 8B, assume that the information reader shifts downwardly as shown by arrow B1, the combination of the detected signals of the second wavelength W2 at two detecting points D1 and D2 changes. Three combinations of the detected signals are also generated as the pager moves vertically over the plate P. Therefore, the moving direction of the receiver 100 is detected by a flowchart shown in Fig. 10. However, in the case of this second pattern shown in Fig. 8B, when the reader 12 shifts horizontally, the same signal combinations are detected. So that after detection of the amount of horizontal moving, the difference between the detected amount of the vertical and the detected amount of the horizontal moving should be made to determine an actual amount of vertical moving. Next, the operation of the embodiment of Fig. 4 will be described referring to Figs. 11, 12A and 12B. When a user of the paging receiver 100 turns on a power switch (not shown), the receiver 100 enters a message waiting state. When the receiver 100 is paged and receives a display information (step S1), the receiver generates an alert (step S2). If the amount of the received display information is too large to display at one time (step S3), the user puts the receiver 100 on the plate as shown in Fig. 11 (step S4). The receiver 100 is arranged on the plate P with the LCD 11 face up and the optical coordinate information reader 12 face down. When the user operates the reset switch 13 (step S5), the light emitting circuit 123 and the light receiving circuit 122 are turned on (step S6). Therefore, the light sources output the outgoing lights to the plate P. At the same time, the display position in the initial position is set in the first position P1 of the received display information in the upper left corner as shown in Fig. 2. Then the user moves the receiver 100 on the plate to shift the displayed information (step S7). On the detection of moving of the receiver 100 in a horizontal direction and a vertical direction by the CPU 14 via optical coordinate information reader 12 (steps S8 and S10), the CPU 14 controls the display on the LCD 11 via the LCD driver 10 to shift the displayed information (steps S9 and S11). Namely, the change of the above-mentioned signal combination is read by the CPU 14, and the vertical and horizontal shifting quantities of display information are regulated under the control of the CPU 14, thereby enabling the information displayed on the LCD 11 to be shifted according to the position of that information in the pager memory. Along with rightward shifting on the plate P in the horizontal direction A (Fig. 2), the position of information to be displayed will also move correspondingly rightward, and along with downward shifting in the vertical direction B, the display position of information will be also move downward. Therefore, vertical and horizontal shifting will enable all the information stored in the pager memory to be readily and quickly confirmed. Then, if the user operates the reset switch 13 again (step S12), the light emitting circuit 123 and the light receiving circuit 122 are turned off (step S13). In the step S3, if the received display information can be displayed at one time, an ordinary display operation is executed (step S14). Next, another embodiment of the invention will be described referring to Figs. 13 to 15B. Another concrete example of the information reader 12 is shown in Fig. 13 which is a perspective view of bottom surface of the paging receiver 100 of the embodiment. In the information reader 12, the two pairs of the light source and the light receiving lens are arranged diagonally. Figs. 14A and 14B respectively show the first pattern for horizontal direction detection and the second pattern for vertical direction detection for this second embodiment. Therefore, the actual plate P in the second embodiment has the combined pattern with the first and second patterns as shown in Fig. 14C. The method for detection will be described referring to Figs. 15A to 15B. As shown in Fig. 15A, assume that the information reader 12 shifts along rightwardly as shown by arrow A2, the combination of the detected signals at the first wavelength W1 at two detecting points D1 and D2 changes. There are three combinations of the detected signals generated by the movement. Therefore, the moving direction of the receiver 100 is detected by the same flowchart shown in Fig. 9 in the first embodiment. On the other hand, as shown in Fig. 15B, assume that the information reader shifts along downwardly shown by arrow B2, the combination of the detected signals of the second wavelength W2 at two detecting points D1 and D2 changes. There are also three combinations of the detected signals generated by the movement. Therefore, the moving direction of the receiver 100 is detected by a flowchart shown in Fig. 16. As stated above, the present invention provides the benefit of making it possible to readily and quickly access information and grasp its total content by matching the output of coordinate reading by an optical mouse having a coordination on a display unit, and shifting the displayed position of information on the display unit. Although the present invention has been fully described by way of a preferred embodiment thereof with reference to the accompanying drawings, various changes and modifications will be apparent to those having skill in this field. Therefore, unless these changes and modifications otherwise depart from the scope of the present invention, they should be construed as included therein.

Claims: A radio paging receiver (100) with a display function for receiving a radio signal including an address number and display information which may exceed the capacity of the display, the receiver comprising: a display means (11), arranged on a first surface of said receiver (100), for displaying the display information; and characterised by further comprising: an optical position sensor means (12), arranged on a second surface of said receiver opposite to said first surface, adapted to detect a direction in which the receiver is moved to detect which portion of the information is to be displayed on the display means (11) when the display information exceeds the capacity of the display means (11) the portion of the information to be displayed being determined by the location of the information in a memory (9) of said receiver, the optical position sensor means (12) comprising: a light emitting circuit (123) for emitting light of two different wavelengths (W1, W2); a receiver circuit (122) for receiving reflected light corresponding to the emitted light from said light emitting circuit (123), said reflected light being reflected by an optical reflective surface providing coordinate information, the optical reflective surface being provided on a plate (P) upon which the receiver (100) is placed to present the optical sensor means (12) to the surface, said optical reflective surface comprising a grid pattern of reflective areas and non-reflective areas, said grid pattern comprising a first pattern of reflective areas and non-reflective areas for absorbing light of one wavelength and a second pattern of reflective areas and non-reflective areas for absorbing light of the other wavelength, wherein in said first pattern, the spacing between the non-reflective areas in a first direction is twice that between the reflective areas and in the second pattern, the spacing between the non-reflective areas in a second direction orthogonal to the first direction is twice that between the reflective areas; whereby the optical position sensor means (12) optically reads and inputs coordinate information upon relative scanning movement between the optical position sensor means (12) and the surface in a desired direction, said relative movement being produced by moving the receiver on the surface; and display control means (14) for identifying said location in said memory (9) to cause the information stored in a particular location to be displayed and for shifting the information displayed on the display means (11) according to the input coordinate information corresponding to the relative scanning movement. A radio paging receiver as claimed in Claim 1, wherein said receiver circuit (122) separately receives said reflected light of two different wavelengths to detect the direction of the relative movement. A radio paging receiver as claimed in Claim 2, wherein said optical position sensor means (12) has at least two pairs of a light emitting source (124) and a receiver lens (121). A radio paging receiver as claimed in Claim 3, wherein said pairs are arranged diagonally of rectangular coordinate axes to detect separately relative movement of said sensor means (12) and surface parallel to each of said axes and to provide coordinate information relative thereto. A radio paging receiver as claimed in Claim 4, wherein the optical reflective surface provides rectangular coordinate information. A radio paging receiver as claimed in Claim 5, wherein said optical reflective face is divided into a plurality of small areas in said grid pattern, some of said small areas being reflective of light of one said wavelength and non-reflective of light of the other said wavelength, other of said small areas being non-reflective of light of the one wavelength and reflective of light of the other wavelength. A radio paging receiver according to any preceding claim, wherein said non-reflective areas for absorbing light having the other wavelength extend diagonally with respect to the non-reflective areas for absorbing light having said one wavelength. A method of controlling a display arranged on a first surface of a radio paging receiver (100), the method comprising the step of: receiving display information which exceeds the capacity of the display; and characterised by further comprising the steps of: memorising said display information; providing an optically reflective surface which provides coordinate information in light reflected therefrom, the optical reflective surface being provided on a plate (P) upon which the receiver (100) is placed to present the optical sensor means (12) to the surface, said optical reflective surface comprising a grid pattern of reflective areas and non-reflective areas, said grid pattern comprising a first pattern of reflective areas and non-reflective areas for absorbing light of one wavelength and a second pattern of reflective areas and non-reflective areas for absorbing light of another wavelength, wherein in said first pattern, the spacing between the non-reflective areas in a first direction is twice that between the reflective areas and in the second pattern, the spacing between the non-reflective areas in a second direction orthogonal to the first direction is twice that between the reflective areas; irradiating the surface with light of two different wavelengths (W1, W2); emitted from a second surface of said receiver opposite to said first surface so as to produce said coordinate information; producing relative movement between an optical position sensor means and said surface, said relative movement being produced by moving the receiver on the surface; detecting the direction and magnitude of the relative movement of the receiver and the surface by detecting light reflected by said surface; identifying memory locations in said memory to cause the information stored therein to be displayed; and shifting the information displayed on the display according to the coordinate information corresponding to the direction and magnitude of the relative movement detected in said detecting step.

Inventors: FUJII TOMOHIRO, FUJII, TOMOHIRO, Fujii, Tomohiro, c/o Nec Corporation
Applicants: NIPPON ELECTRIC CO, NEC CORPORATION
Application year: 1993
Main classification: G08B5
IPC codes: G06F3, G08B5, G06F1