JP2009258382A - Display control method and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rewrite a display part at good timing by immediately rewriting a display screen only when external pressure is applied to a display surface of the display part and the display surface is discolored. <P>SOLUTION: When receiving an external pressure detection value from an external detection part (step S105), a control IC determines whether the external pressure detection value exceeds a threshold or not (step S107), and when the external pressure detection value exceeds the threshold (determined as Yes in the step S107), starts a rewrite preparation state of a cholesteric LCD 16 (step S108). Then the control IC monitors whether the external pressure detection value becomes the threshold and less or not (step S109), and when the external pressure detection value becomes the threshold and less, (determined as Yes in the step S109), reads display data from a RAM 143 (step S110) and redraws the display data on the cholesteric LCD 16 (step S111). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display control method for a display device including a display unit having memory characteristics.

  As a display device including a display unit having a memory property, a display device in which the display unit is configured using cholesteric liquid crystal is known. The cholesteric liquid crystal can maintain the display state of the display unit without always supplying power, but has a property that the display surface changes color when an external pressure is applied to the display screen.

  FIG. 14 shows a display example when a cholesteric liquid crystal display device is used as the electronic shelf label 100, for example.

  The electronic shelf label 100 has a structure in which a cholesteric liquid crystal display unit 101 is housed and held in a housing 102, and the entire front surface of the housing 102 is a display surface (transparent display window) 103. Then, for example, product information as shown in FIG. In this state, as shown by hatching in FIG. 7B, when a person or the like presses the display surface 103 with a fingertip, when the finger or the like is released, as shown in FIG. Only the selected portion 104 is discolored (that is, it is in a state where the color is white and missing). Therefore, it is necessary to secure a sufficient distance between the display surface of the cholesteric liquid crystal and the display surface 103 of the housing 102 that protects the display surface. That is, even if the display surface 103 of the housing 102 is pressed and bent by a human finger or the like, it is necessary to secure a distance that does not allow the display surface 103 of the housing 102 to touch the display surface of the cholesteric liquid crystal. There has been a problem that there is a limit to thinning the device.

  In addition, since the cholesteric liquid crystal itself cannot recognize the discoloration of the display screen, when the display screen is discolored, the display content cannot be read. For this reason, when the display screen changes color, it is necessary to redraw immediately. Conventionally, the restoration (redrawing) of the display content must be performed manually by the user after confirming the restoration of the display content. It was an expensive work.

  In view of this, various redrawing techniques have been proposed in the past in order to avoid leaving the display content unreadable when the display screen changes color (for example, Patent Documents 1 and 2). Etc.).

  The device described in Patent Document 1 is in a crossing position by applying a pulse voltage to a scanning electrode and a signal electrode arranged in a matrix with respect to a liquid crystal display element in which a liquid crystal exhibiting a cholesteric phase is sandwiched between transparent substrates. In an information display device that displays information by selecting a liquid crystal in a planar state or a focal conic state, information (image data) is stored in a memory and rewritten at a predetermined timing by a clock timer built in the signal controller (re-displayed). To draw).

In addition, in the digital camera using a memory card to which a liquid crystal display element having a display screen using a memory liquid crystal is attached, a recorded image is scanned for a predetermined time when the stored image is reproduced. A timer used to determine whether there is no image is started, and an image with the maximum frame number is displayed and stored. Thereafter, when a predetermined time elapses without any key operation, the display state is updated (redrawn).
JP 2000-147465 A JP 2000-278572 A

  In any of the above-mentioned Patent Documents 1 and 2, the display screen is automatically updated (redrawn) by periodically rewriting the display screen using a timer. That is, there is a problem that wasteful power consumption occurs because the display screen is regularly updated (redrawn) regardless of whether the display screen has changed color. For this reason, electronic shelf labels driven mainly by batteries have a problem that the frequency of battery replacement increases and the burden on the user increases.

  Further, in the periodic update, there is a problem that even if the display screen changes color in the meantime, the display content cannot be read until the next update.

  The present invention was devised to solve such a problem, and its purpose is to solve the above-mentioned problem by rewriting the display screen immediately only when the display surface of the display section is changed in color by external pressure. An object of the present invention is to provide a display control method and a display device for a display device including a display unit having a characteristic.

  In order to solve the above problems, a display control method of the present invention is a display control method for a display device including a display unit having a memory property, and includes an external pressure detection step for detecting an external pressure with respect to the display unit, and the external pressure detection A first determination step for determining the presence or absence of an external pressure detected in the step; and a drawing step for redrawing display information on the display unit when it is determined that there is an external pressure in the first determination step. It is characterized by that.

  That is, according to the present invention, the external pressure on the display unit is detected, the presence / absence of the detected external pressure is determined, and the display information on the display unit is redrawn only when it is determined that there is an external pressure. That is, it is possible to reliably prevent the display contents from being left unreadable by immediately redrawing the display screen only when an external pressure is applied to the display surface of the display unit and the color is changed. Further, by redrawing only when the display surface of the display unit is changed in color by external pressure, battery consumption can be suppressed as much as possible, and the battery life can be extended. This also reduces the burden of battery replacement by the user. Furthermore, since the distance between the display surface of the cholesteric liquid crystal and the housing surface that protects the cholesteric liquid crystal can be shortened, the visibility is improved and the display device can be made thinner.

  The display control method of the present invention is a display control method for a display device including a display unit having a memory function, and is detected by an external pressure detection step for detecting an external pressure with respect to the display unit, and the external pressure detection step. A first determination step for determining the presence or absence of an external pressure, a second determination step for determining the release of the external pressure after determining that there is an external pressure in the first determination step, and an external pressure by the second determination step And a drawing step of redrawing the display information of the display unit when it is determined to be released.

  That is, according to the present invention, the external pressure on the display unit is detected, the presence / absence of the detected external pressure is determined, and after determining that the external pressure is present, the display information on the display unit is displayed when it is determined that the external pressure has been released. It is designed to redraw. Thus, by redrawing when the external pressure is released, it is possible to reliably redraw the display screen. That is, when redrawing is performed at the time when the external pressure is detected, if the external pressure is released after being pressed for a long time, the pressed position is still discolored. Such a problem does not occur.

  Here, the first determination step is configured to determine that there is an external pressure with an external pressure equal to or greater than a predetermined value, and the second determination step is configured to determine that the external pressure is released with an external pressure equal to or less than a predetermined value. Good.

  The drawing step may be configured to redraw the display information stored in the storage unit of the display device on the display unit. However, with regard to display information, for example, in the case of an electronic shelf label, the display information is stored in an external shelf label server, and the latest display information is acquired from this shelf label server and redrawing is performed. May be.

  The external pressure detection step may be configured to detect an external pressure based on a detection value of a sensor provided in a housing of the display unit. As a sensor in this case, there are a sensor that acquires data in an analog manner such as a strain gauge and a pressure sensor, and a sensor that acquires data digitally by turning on and off a switch. In addition, in a case where a touch panel is provided on the surface, the touch panel itself can be used as a sensor.

  Further, the display device of the present invention is a display device having a display unit having a memory property, a display control unit for drawing display information of the display unit, and an external pressure detection unit for detecting the presence or absence of an external pressure on the display unit The display control means redraws the display information on the display unit when it is determined that the external pressure is released after determining that the external pressure is present based on the detected value of the external pressure by the external pressure detection means. It is characterized by doing.

  According to the present invention, only when an external pressure is applied to the display surface of the display unit and the color is changed, the display screen is immediately redrawn, thereby reliably preventing the display content from being left unreadable. Can do. Further, by redrawing only when the display surface of the display unit is changed in color by external pressure, battery consumption can be suppressed as much as possible, and the battery life can be extended. This also reduces the burden of battery replacement by the user. Furthermore, since the distance between the display surface of the cholesteric liquid crystal and the housing surface that protects the cholesteric liquid crystal can be shortened, the visibility is improved and the display device can be made thinner. Furthermore, by detecting the external pressure on the display unit, determining the presence or absence of the detected external pressure, determining that the external pressure is present, and then redrawing the display information on the display unit when determining that the external pressure has been released. The display screen can be reliably redrawn. That is, when redrawing is performed at the time when the external pressure is detected, if the external pressure is released after being pressed for a long time, the pressed position is still discolored. Such a problem does not occur.

  Since the present invention is configured as described above, the display screen is immediately redrawn only when an external pressure is applied to the display surface of the display unit and the color is changed, so that the display content is left unreadable. It can be surely prevented. Further, by redrawing only when the display surface of the display unit is changed in color by external pressure, battery consumption can be suppressed as much as possible, and the battery life can be extended. This also reduces the burden of battery replacement by the user. Furthermore, since the distance between the display surface of the cholesteric liquid crystal and the housing surface that protects the cholesteric liquid crystal can be shortened, the visibility is improved and the display device can be made thinner.

  Hereinafter, as an example of a display device that implements the display control method of the present invention, a case where it is applied to an electronic shelf label will be described with reference to the drawings.

<Embodiment 1>
FIG. 1 is a functional block diagram showing an electrical configuration of the electronic shelf label 1 according to the first embodiment.

  The electronic shelf label 1 includes a battery 11 as a power supply unit, an LCD power supply circuit 12 that generates LCD power, an input unit 13 including buttons and a touch panel, a control IC 14 that controls the electronic shelf label 1, an antenna 15, a display unit 16, A COMMON driver 17 and a SEGMENT driver 18 that drive the cholesteric LCD and cholesteric liquid crystal (memory liquid crystal) of the display unit 16, an RTC (Real Time Clock) 19 that measures time, and an external pressure detection unit 20 that detects an external pressure applied to the display unit 16. It consists of

  The control IC 14 is a CPU 141 for controlling the electronic shelf label 1, a ROM 142 for storing a control program, a data to be displayed on the display unit 16, a RAM 143 used as a communication transmission / reception buffer, a voltage of the battery 11 and an external pressure An A / D converter (ADC) 145 for detecting the external pressure applied to the display unit 16 by the detection unit 20, an RF circuit 146 that is a wireless communication unit, and an I / O that outputs control signals and LCD drive signals for the LCD power supply circuit 12. The circuit 147 is configured.

  The battery 11 is supplied to the LCD power circuit 12 and the control IC 14. The external pressure detection unit 20 is a sensor provided in a housing that protects the display unit 16, detects deformation of the housing, and supplies the detected value to the ADC 145.

  The LCD power supply circuit 12 is a circuit that converts the power supplied from the battery 11 into a power supply for driving the LCD. A power supply voltage suitable for LCD driving is generated based on the voltage of the battery 11 input to the control IC 14. In other words, the CPU 141 of the control IC 14 generates a control signal for generating an optimum voltage, and sends the control signal from the I / O circuit 147 to the LCD power supply circuit 12, so that the LCD power supply circuit 12 is suitable for driving the LCD. A power supply voltage is generated.

  The control IC 14 communicates with a shelf label controller 31 of a shelf label server (not shown) via the antenna 15 from the RF circuit 146. Further, the control IC 14 stores display data from the shelf label controller 31 in the RAM 143. Then, the current time is measured by the RTC 144, and when the predetermined time is reached, the control IC 14 reads out data of a necessary area to be displayed on the cholesteric LCD from the RAM 143, and from the I / O circuit 147, the COMMON driver 17 and the SEGMENT driver. 18 is output. Then, signals are sent from the COMMON driver 17 and the SEGMENT driver 18 to the cholesteric LCD, and information about the product is displayed (drawn) on the cholesteric LCD.

  Further, the control IC 14 determines the presence or absence of the external pressure detected by the external pressure detection unit 20. When the control IC 14 determines that the external pressure is present, the control IC 14 reads the display data stored in the RAM 143 and reads the COMMON driver 17 from the I / O circuit 147. Or output to the SEGMENT driver 18 to redraw the display information on the cholesteric LCD of the display unit 16. Such a redrawing processing procedure program is stored in the ROM 142 in advance.

  The external pressure detection unit 20 is disposed in a casing 50 portion of the electronic shelf label 1 described later, and a strain gauge, a pressure sensor, an on / off switch, and the like can be used.

  FIG. 2 is a cross-sectional view illustrating a schematic structure of the electronic shelf label 1 according to the first embodiment.

  The electronic shelf label 1 includes a battery 11, an LCD power supply circuit 12, a control IC 14, an antenna 15, a COMMON driver 17, a SEGMENT driver 18, and an RTC 19 on a bottom surface 50a in a casing 50 formed in a substantially rectangular parallelepiped shape with a small thickness. Is mounted in a state where the circuit board 51 is supported by the support legs 52, and a cholesteric LCD as the display unit 16 is disposed on the circuit board 51 via a support piece 53 that is also a spacer. It becomes the composition. A portion of the upper surface 50 b of the housing 50 that faces the display surface 16 a of the cholesteric LCD 16 is a display surface (transparent display window) 55 on the housing 50 side. As described above, since the portion of the cholesteric LCD 16 is discolored when an external pressure is applied to the display surface 16a, a certain gap t1 is provided between the display surface 16a of the cholesteric LCD 16 and the housing side display surface 55. However, when the casing-side display surface 55 is strongly pressed, it is inevitable that the casing-side display surface 55 comes into contact with the display surface 16a of the cholesteric LCD 16. In the first embodiment, in order to detect this contact, The external pressure detector 20 is arranged at 50.

  In the example shown in FIG. 2, the external pressure detection unit 20 is a strain gauge 20 a that is directly attached to the inside of the upper surface 50 b (that is, the outer peripheral portion of the upper surface 50 b) excluding the housing-side display surface 55 of the housing 50. The detected value of the strain gauge 20a is input to the control IC 14. Thereby, when the upper surface 50b of the housing 50 (ie, the housing-side display surface 55) is bent by being pressed, the amount of bending is detected by the strain gauge 20a.

  FIG. 3 shows another embodiment of the external pressure detector 20.

  The external pressure detector 20 of the present embodiment is a strain gauge 20a as in the above embodiment, but its arrangement position is different from that in the above embodiment. In other words, in the present embodiment, the strain gauge 20 a is directly attached to either the outside of the upper surface 50 b excluding the housing side display surface 55 of the housing 50 or the outside of the side surface 50 c of the housing 50. In addition, in FIG. 3, although attached to the outer side of the side surface 50c of the housing | casing 50, you may attach to the inner side of the side surface 50c. The detected value of the strain gauge 20a is input to the control IC 14. Thereby, when the upper surface 50b of the housing 50 (ie, the housing-side display surface 55) is bent by being pressed, the amount of bending is detected by the strain gauge 20a.

  FIG. 4 shows another embodiment of the external pressure detector 20.

  The external pressure detection unit 20 of the present embodiment is a pressure sensor 20b, and is attached and fixed to an upper portion of a support rod 61 provided upright on a bottom surface 50a of the housing 50, and is arranged so as to substantially contact the upper surface 50b of the housing 50. Has been. The detection value of the pressure sensor 20b is input to the control IC 14. Thus, when the upper surface 50b of the housing 50 (ie, the housing-side display surface 55) is bent by being pressed, this bending is detected by the pressure sensor 20b.

  5 and 6 show still another embodiment of the external pressure detection unit 20.

  The external pressure detection unit 20 of the present embodiment is an on / off switch 20c such as a limit switch. In FIG. 5, the external pressure detection unit 20 is attached and fixed to an upper portion of a support rod 62 standing on the bottom surface 50a of the housing 50. 50 is arranged so as to be substantially in contact with the upper surface 50b (or with a slight gap). The detection value (ON signal) of the ON / OFF switch 20c is input to the control IC 14. Accordingly, when the upper surface 50b (that is, the housing side display surface 55) of the casing 50 is bent to be bent, the bending is detected by the on / off switch 20c.

  On the other hand, in FIG. 6, the on / off switch 20c is directly attached to the inside of the upper surface 5b excluding the housing-side display surface 55 of the housing 50, and facing the on / off switch 20c. A switch operating rod 63 is erected on the bottom surface 50a of 50. The upper end portion of the switch operating rod 63 and the switch portion (operating portion) of the on / off switch 20c are arranged to face each other (or with a slight gap). The detection value (ON signal) of the ON / OFF switch 20c is input to the control IC 14. Accordingly, when the upper surface 50b (that is, the housing side display surface 55) of the casing 50 is bent to be bent, the bending is detected by the on / off switch 20c.

  FIG. 7 shows still another embodiment of the external pressure detection unit 20.

  The external pressure detection unit 20 of the present embodiment is a sensor 20d that is either a strain gauge or a pressure sensor, and is disposed on the circuit board 51 so as to come into contact with the cholesteric LCD 16 in a gap between the circuit board 51 and the cholesteric LCD 16. ing. Accordingly, when the upper surface 50b of the casing 50 (that is, the casing-side display surface 55) is pressed and bent, the sensor 20d detects this contact when it contacts the surface 16a of the cholesteric LCD 16.

  FIG. 8 shows still another embodiment of the external pressure detection unit 20.

  As shown in FIG. 8, the electronic shelf label 1 is usually attached to a store display case or the like via an attachment jig 71. That is, a pair of left and right (or top and bottom) hook-shaped locking portions 72 provided on the mounting jig 71 and left and right (or top and bottom) locking to the locking portions 72 provided on the bottom surface 50 a of the housing 50. ) A pair of hook-shaped locked portions 57 are provided, and the electronic shelf label 1 can be attached to a display case or the like by locking them together. Therefore, a slight gap P is generated between the bottom surface 50 a of the housing 50 and the mounting jig 71. Therefore, in this embodiment, the external pressure detection unit 20 is disposed in the gap P at the center of the bottom surface 50a of the housing 50. The external pressure detection unit 20 of the present embodiment is various sensors 20e such as a pressure sensor and an on / off switch. The detection value of the sensor 20e is input to the control IC 14. Accordingly, when the upper surface 50b of the housing 50 (that is, the housing-side display surface 55) is pressed and the entire housing 50 is bent, this bending is detected by the sensor 20e.

  FIG. 9 shows still another embodiment of the external pressure detector 20.

  In each of the above embodiments, a strain gauge, a pressure sensor, and an on / off switch are used as the external pressure detection unit 20. However, in this embodiment, as the input unit 13 disposed on the housing side display surface 55 of the housing 50. This is an embodiment in which the touch panel 13 a is used as the external pressure detection unit 20.

  In this case, the electronic shelf label 1 includes an input mode for inputting information from the touch panel 13a and a display mode. When inputting information from the touch panel 13a, the electronic shelf label 1 is switched from the display mode to the input mode for input. It will be. Therefore, in this embodiment, when the touch panel 13a is pressed in the display mode state, this is detected by the control IC 14.

  Next, redrawing processing of the cholesteric LCD 16 in the electronic shelf label 1 in which the external pressure detection unit 20 is arranged as described above will be described with reference to a flowchart shown in FIG. 10 and a timing chart shown in FIG. However, the timing chart shown in FIG. 11A is a timing chart when the external pressure detection unit 20 outputs an analog value as a detection value such as a strain gauge or a pressure sensor, and the timing chart shown in FIG. It is a timing chart in case the detection part 20 outputs a digital value as a detection value like an on / off switch.

  When the control IC 14 receives the display data transmitted from the shelf label controller 31 (step S101), the control IC 14 determines whether the received data is the display data transmitted to the own device, for example, by the ID code of the own device. Whether it is included or not is confirmed (step S102). If it is display data transmitted to the own apparatus, the display data is stored in the RAM 143 (step S103). Then, the current time is measured by the RTC 144, and when the predetermined time is reached, the control IC 14 reads display data to be displayed on the cholesteric LCD 16 from the RAM 143, and outputs it from the I / O circuit 147 to the COMMON driver 17 and the SEGMENT driver 18. To do. Then, signals are sent from the COMMON driver 17 and the SEGMENT driver 18 to the cholesteric LCD 16 to draw display data on the cholesteric LCD 16 (step S104). For example, the content shown in FIG. 14A is displayed on the cholesteric LCD 16.

  In this state, when the control IC 14 receives the detection value of the external pressure from the external detection unit 20 (step S105), it first determines whether or not its own device is in a rewriting preparation state (step S106), and the rewriting preparation state. If it is not (No in step S106), the external pressure detection value from the external detection unit 20 is set to a level that requires rewriting (a method for setting this threshold will be described later). It is determined whether or not it exceeds (step S107). As a result, when the external pressure detection value does not exceed the threshold value that needs to be rewritten (when it is determined No in step S107), although the housing side display surface 55 of the housing 50 is pressed, the cholesteric Since it can be determined that the display surface 16a of the LCD 16 has changed color, the process returns to step S101 without doing anything in this case.

  On the other hand, when the detected external pressure value exceeds the threshold value that requires rewriting (when determined Yes in step S107), the cholesteric LCD 16 is ready for rewriting (step S108). In other words, the cholesteric LCD 16 is ready for rewriting at the timing T1 in FIG. As a result, the determination in step S106 becomes Yes, and the control IC 14 next monitors whether or not the external pressure detection value has become equal to or smaller than the threshold value (step S109). When the detected external pressure value is equal to or less than the threshold value (when it is determined Yes in step S109), that is, when the timing T2 in FIG. 11A or 11B is reached, the control IC 14 displays on the cholesteric LCD 16. The displayed display data is read from the RAM 143 (step S110), and is output from the I / O circuit 147 to the COMMON driver 17 and the SEGMENT driver 18. Then, a signal is sent from the COMMON driver 17 and the SEGMENT driver 18 to the cholesteric LCD 16 to redraw the display data on the cholesteric LCD 16 (step S111). Thereby, for example, the display screen of the cholesteric LCD 16 in the state shown in FIG. 14C can be redrawn to the original display content as shown in FIG.

  Thereafter, the control IC 14 cancels the rewriting preparation state (step S112), returns to step S10 again, and returns to the state waiting for display data from the shelf label controller 31.

  Next, an example of a threshold setting method for determining the redrawing timing will be described for each case.

(1) When the external pressure detection unit 20 acquires data in an analog manner such as a strain gauge or a pressure sensor In this case, the external pressure detection unit 20 is attached to the case 50 of the actual electronic shelf label 1, and the case 50 External pressure detection when the housing side display surface 55 is actually pressed to bend the housing 50 and the housing side display surface 55 is subjected to an external pressure that is lightly in contact with the display surface 16a of the cholesteric LCD 16 (not discolored). The external pressure value of the unit 20 is acquired by performing a simulation or the like, and the acquired external pressure value is stored in the ROM 142 as a threshold value.

(2) When the external pressure detection unit 20 acquires data digitally such as an on / off switch Normally, the external pressure detection unit 20 is attached to the case 50 of the actual electronic shelf label 1 and no external pressure is applied to the case 50 In some cases, a gap is provided between the external pressure detection unit 20 and the upper surface 5b of the housing 50 to place the external pressure detection unit 20 in an off state. From this state, the housing side display surface 55 of the housing 50 is actually pushed to bend the housing 50, and the external pressure detection unit 20 is turned off immediately before the housing side display surface 55 contacts the display surface 16a of the cholesteric LCD 16. Set the position so that it is turned on. Accordingly, the determination in step S107 and step S109 in FIG. 10 in this case is whether or not the external pressure detection value is an ON signal. That is, the threshold value in step S107 and step S109 is the voltage value of the on signal.

(3) When the external pressure detection unit 20 is the touch panel 13a When using the touch panel 13a, no threshold is provided. Therefore, the determination in step S107 in FIG. 10 is whether or not an input signal of the touch panel 13a is input to the CPU 141 of the control IC 14 in the display mode. The determination in step S109 is whether or not the input of the input signal of the touch panel 13a to the CPU 142 is canceled in the display mode.

  In the first embodiment, the timing when the external pressure detection value exceeds the threshold (timing T1 in FIG. 11 (a) or (b)) and the external pressure detection value are equal to or less than the threshold as the redrawing process timing. In this case, the timing of both of the timings (timing T2 in FIG. 11 (a) or (b)) is observed, but the later timing, that is, the timing when the external pressure detection value is equal to or smaller than the threshold (FIG. 11). Only by referring to the timing T2) of (a) or (b), the rewriting preparation and the redrawing process may be continuously performed.

<Embodiment 2>
FIG. 12 is a functional block diagram showing an electrical configuration of the electronic shelf label 1 according to the second embodiment.

  The difference between the electronic shelf label 1 of the second embodiment and the electronic shelf label 1 of the first embodiment is that the setting of the threshold value can be post-registered on the user side. Therefore, in the second embodiment, the operation unit 13 is provided with a threshold setting switch 13b. Other configurations are the same as the configuration of the electronic shelf label 1 of the first embodiment shown in FIG. 1, and therefore, the same reference numerals are given to the same blocks here, and detailed description thereof is omitted.

  Here, the post-registration processing of the threshold value, which is a feature of the second embodiment, will be described with reference to the flowchart shown in FIG.

  In the post-registration process, the user first maintains the state in which the threshold setting switch 13b is pressed (step S121). As a result, the control IC 14 shifts to a threshold setting mode. In this state, the user presses the substantially central portion of the housing side display surface 55 of the housing 50 with a finger or the like to bend the housing upper surface 5 b including the housing side display surface 55. At this time, the control IC 14 receives the detection value of the external pressure from the external detection unit 20 (step S122), and whether or not the threshold setting switch 13b is turned off (that is, whether the finger or the like is released from the threshold setting switch 13b). Whether or not) is monitored (step S123).

  Then, when the user pushes the housing side display surface 55 to a state immediately before the housing side display surface 55 contacts the display surface 16a of the cholesteric LCD 16, the user releases the threshold setting switch 13b in the pushed state. Accordingly, since it is determined Yes in step S123, the control IC 14 receives this and stores the detected value of the external pressure received from the external detection unit 20 at that time in the ROM 142 or the like as a new threshold (step S124). Cancel the threshold setting mode. That is, the post registration process is terminated.

  The new threshold value set here may be registered in the RAM 143, for example, in order to distinguish it from the threshold value already registered in the ROM 142 as a default, or another non-volatile memory is prepared, You may make it memorize | store in this memory. When performing the redrawing process, the threshold value stored in the RAM 143 or another non-volatile memory may be used in preference to the threshold value already registered in the ROM 142 as a default value. .

  As described above, by allowing the user to freely change the setting of the threshold value, it is possible to perform the redrawing process at a timing suitable for the actual use site.

  In the said embodiment, although the electronic shelf label was illustrated as a display apparatus to which the display control method of this invention is applied, it is not limited to this electronic shelf label. Recently, since a cholesteric LCD is mounted on a display unit in an electronic book, a cellular phone, and the like, the book is used in all display devices including the cholesteric LCD as a display unit, such as the electronic book and the cellular phone. The display control method of the invention can be applied.

It is a functional block diagram which shows the electric constitution of the electronic shelf label concerning Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the electronic shelf label concerning Embodiment 1. FIG. It is sectional drawing which shows the other Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. It is sectional drawing which shows the further another Example of an external pressure detection part. 6 is a flowchart for explaining redrawing processing of an electronic shelf label according to the first embodiment. 3 is a timing chart for explaining the redrawing process of the electronic shelf label according to the first embodiment. It is a functional block diagram which shows the electric constitution of the electronic shelf label concerning Embodiment 2. FIG. 10 is a flowchart for explaining a threshold post-registration process, which is a feature of the second embodiment. It is explanatory drawing which shows the example of a display at the time of using the display apparatus of a cholesteric liquid crystal as an electronic shelf label.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic shelf label 11 Battery 12 LCD power supply circuit 13 Input part 13a Touch panel 13b Threshold setting switch 14 Control IC
15 Antenna 16 Display (Cholesteric LCD)
16a Display surface 17 COMMON driver 18 SEGMENT driver 19 RTC
20 external pressure detector 20a strain gauge 20b pressure sensor 20c on / off switch 20d, 20e sensor 31 shelf label controller 50 housing 50a bottom surface 50b top surface 50c side surface 55 display surface 141 CPU
142 ROM
143 RAM
145 A / D converter (ADC)
146 RF circuit 147 I / O circuit

Claims (6)

A display control method for a display device including a display unit having memory characteristics,
An external pressure detecting step of detecting an external pressure with respect to the display unit;
A first determination step of determining the presence or absence of the external pressure detected in the external pressure detection step;
A display control method for a display device, comprising: a drawing step of redrawing display information of the display unit when it is determined that there is an external pressure in the first determination step. A display control method for a display device including a display unit having memory characteristics,
An external pressure detecting step of detecting an external pressure with respect to the display unit;
A first determination step of determining the presence or absence of the external pressure detected in the external pressure detection step;
A second determination step of determining release of the external pressure after determining that there is external pressure in the first determination step;
A display control method for a display device, comprising: a drawing step of redrawing display information of the display unit when it is determined that the external pressure is released in the second determination step. The display control method for a display device according to claim 2, wherein the first determination step determines that there is an external pressure at an external pressure equal to or greater than a predetermined value,
The display control method for a display device, wherein the second determining step determines that the external pressure is released when the external pressure is equal to or less than a predetermined value. In the display control method of the display device according to any one of claims 1 to 3,
The display control method for a display device, wherein the drawing step redraws the display information stored in the storage unit of the display device on the display unit. In the display control method of the display device according to any one of claims 1 to 4,
The display control method for a display device, wherein the external pressure detection step detects an external pressure based on a detection value of a sensor provided in a housing of a display unit. In a display device including a display unit having a memory property,
Display control means for drawing display information of the display unit;
An external pressure detecting means for detecting the presence or absence of external pressure on the display unit;
The display control means redraws the display information of the display unit when it is determined that the external pressure is released after determining that the external pressure is present based on the detection value of the external pressure by the external pressure detection means. Display device.

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