JP2001282162A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the response speed of a liquid crystal panel seam as if it is quick even when a liquid crystal panel whose response speed is slow by changing the changeover timing and the contents of a display. SOLUTION: When a reset temperature is detected by a temperature detecting circuit 906, data in which a part which is to be rewritten at time performing display next is erased in preset timing by a CPU 902 are transmitted to a driver IC 904 to be displayed on a display element 905 and when displaying time is changed, the data are displayed with the display element 905.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a liquid crystal panel, such as a table clock, a wristwatch, a stopwatch and the like.

[0002]

2. Description of the Related Art Conventionally, electronic devices that display numbers, characters, and other information using a flat display device such as a liquid crystal display device have been widely known. For example, now, considering an electronic device using a liquid crystal display device,
For example, as shown in FIG. 8, the electronic device includes a pair of polarizing plates 20 on both sides of a liquid crystal cell 21 in which a liquid crystal 202 is sandwiched between an upper glass 202 and a lower glass 203 on the viewer side.
1 and 204 are arranged. The pair of polarizing plates 52 and 53 are arranged such that their azimuths are perpendicular to each other. Now, when the background is displayed using the external light (the liquid crystal cell 21 is turned off), as shown by the arrow P, the linearly polarized light in the direction parallel to the paper of the external light, that is, natural light, passes through the polarizing plate 201. , The polarization direction is twisted by 90 ° by the liquid crystal cell 21 in the OFF state, and becomes linearly polarized light in a direction perpendicular to the paper surface. The linearly polarized light is irregularly reflected on the surface of the reflecting plate 206 after transmitting through the polarizing plate 205, and a part of the irregularly reflected light is displayed outside after sequentially transmitting through the polarizing plate 205, the liquid crystal cell 21 and the polarizing plate 201. , Is recognized as a white background.

When information such as numbers is displayed using external light (the liquid crystal cell 21 is turned on), as shown by an arrow Q, linearly polarized light parallel to the plane of the drawing is extracted from the external light by the polarizing plate 201. And is transmitted through the liquid crystal cell 21. At this time, since the liquid crystal cell 21 is in the ON state, the polarization direction of the linearly polarized light is maintained in a direction parallel to the paper surface without being twisted, and thus the linearly polarized light is absorbed by the polarizing plate 205. As a result, this part is recognized as black.

[0004]

In the above-mentioned conventional electronic equipment, if the response speed of the liquid crystal is sufficiently fast with respect to the time required for rewriting the time, the switched display data is displayed on the display panel. If the response time of the liquid crystal is not sufficient for the time required to rewrite the time, try to display before the rewriting completely disappears. Was displayed, and it was not possible to correctly recognize the time change.

In the above-described case, the conventional electronic device detects the temperature of the display layer as disclosed in, for example, Japanese Patent Application Laid-Open No. H02-179609, and outputs a driving signal for driving the liquid crystal in accordance with the detected temperature.
For example, a response is made at an appropriate response speed by changing a drive frequency or a drive voltage. When this method is used, the circuit becomes complicated to change the drive frequency and drive voltage in addition to temperature detection, and the current consumption increases due to the change in drive frequency and drive voltage. Had occurred.

In order to increase the response speed as a liquid crystal material, a liquid crystal material having a low viscosity is generally selected. However, the amount of the liquid crystal material having a low viscosity requires a high threshold voltage or sharpness. It tends to be worse, and it has been difficult to keep the current consumption low and to use it for a high-resolution panel. For this reason, for example, when lowering the current consumption, high-speed response and higher resolution are abandoned, and when higher resolution is required, lowering the current consumption is sacrificed.

[0007] The present invention has been made in view of the above problems, and has a high response speed even if the response speed of the liquid crystal panel is not sufficiently fast without complicating the circuit or increasing current consumption. It is an object of the present invention to correctly recognize switching of the display of resolution.

[0008]

In order to achieve the above object, an electronic apparatus according to the present invention is an electronic apparatus having a liquid crystal panel for display, and includes elements necessary for displaying the liquid crystal panel. Changing the mounted circuit board, the connection means for electrically connecting the liquid crystal panel to the circuit board on which the elements necessary for displaying the liquid crystal panel are mounted, and changing the time for switching between display data and display of the liquid crystal panel. And a circuit board on which elements that can be mounted are mounted.

[0009] It is preferable to be able to switch the display data and the display of the liquid crystal panel when the user feels discomfort in switching the display, so that the apparent response speed can be increased.

[0010] By detecting the temperature in the vicinity of the liquid crystal panel and changing the time for switching the display data between the display data in accordance with the detected temperature, the apparent response without bothering the user and increasing the current consumption. This is preferable because the speed can be increased.

The use of a thermistor as the temperature detecting means is preferable in that the temperature can be accurately detected.

It is preferable that the number of external components such as a thermistor can be reduced by detecting the output voltage of the driver that changes in accordance with the temperature and correlating the output voltage with the temperature.

A driver IC necessary for driving the liquid crystal panel is mounted as a connection means for electrically connecting the liquid crystal panel to a circuit board on which elements necessary for displaying the liquid crystal panel for display are mounted. The use of the flexible substrate described above is more preferable than the case of using an anisotropic conductive rubber in that conduction of a liquid crystal panel having a narrower electrode pitch is easier.

The use of anisotropic conductive rubber as the connection means for electrical connection with the circuit board is preferable in that the space for electrical conduction of the circuit board can be reduced.

By using a heat seal connector as a connecting means for electrically connecting a liquid crystal panel to a circuit board on which elements necessary for displaying a liquid crystal panel for display are mounted, anisotropic conductive rubber is used. Is more preferable in that conduction of a liquid crystal panel having a narrower electrode pitch is more secure than when using.

It is preferable in that the display quality can be further improved by changing the voltage for driving the liquid crystal panel depending on the detected temperature.

It is preferable that the voltage for driving the liquid crystal panel can be changed from the outside so that the display quality can be further improved.

It is preferable to attach a belt for carrying to the case of the electronic device from the viewpoint of improving the portability of the electronic device.

It is preferable that the outer case of the electronic device has a waterproof structure since the reliability of the electronic device can be improved.

[0020]

(Embodiment 1) FIG. 1 shows a sectional structure of an electronic device module which is an embodiment of an electronic device according to the present invention. In this embodiment, as shown in FIG. 1, a panel frame 1, a liquid crystal panel 2, a circuit board 3 on which elements necessary for lighting the liquid crystal panel 2 are mounted, and a circuit for holding the circuit board 3 A board frame 4, a conductive rubber 5 for electrically connecting the circuit board 3 and the liquid crystal panel 2,
A battery 6 for supplying power to the circuit board, and screws 7 for fixing the circuit board frame 4 and the panel frame 1 are provided. Also, the circuit board 3 has an input means for gradually setting the time for rewriting the display contents and the display when the response speed is felt to be slow, and for setting the time for rewriting the display contents and the display stepwise. Necessary elements are mounted.

FIG. 2 is a functional block diagram showing a first embodiment of the electronic apparatus of the present invention.

When the liquid crystal panel has a response speed sufficient to rewrite the time, for example, the external switch 901 for changing the display method for gradually setting the display contents and the time for rewriting the display is in the off state. C
This is recognized by the PU 902. At this time, the CPU 902
Display data corresponding to the time data at that time is read from M903, and the display data is output to the driver IC 904 and displayed. When the displayed time is changed, the CPU 902 reads the display data corresponding to the changed time data from the RAM 903, outputs the display data to the driver IC, and displays the display data on the display element 905. I have.

When the response speed of the liquid crystal panel is not sufficient for rewriting the time, for example, the external switch 901 for changing the display method for setting the display contents and the time for rewriting the display stepwise is input only at the necessary stages. Then, the following processing is performed for that stage.

For example, if the liquid crystal panel is driven by writing 60 times to the liquid crystal panel per second, and the external switch 901 is input three times, the time display data is rewritten 57 times after rewriting the time display data. The normal time display data is displayed, and in the subsequent three times, the display element 905 displays the display data excluding the portion where the display content of the display data to be rewritten next changes. That is, 10:08 41 is displayed on the display element 905 57 times after 10:08:41 seconds, and then 10:08 4 is displayed on the display element 905 three times after excluding 1 of 41 seconds. Do. Then, at 10:08:42, display of 10: 0842 is performed by the display element 905. FIG. 3 shows a display example at this time.

This is because the response speed of the liquid crystal panel is normally on.
While the response speed when turning off from on and the response speed when turning off from on become almost the same speed as shown in FIG. 4, by changing the driving voltage, the driving speed is changed from FIG. As shown in FIG. 5, the response speed when turning from off to on is longer than the response speed when turning from on to off. The display panel is driven by driving the liquid crystal panel at a drive voltage having a response speed as shown in FIG. 5 and turning off the portion where the display data changes earlier than the timing at which the display data changes in a temperature region where the response speed slows down. For some people, it can be seen as if they are responding as shown in FIG. 6, so the apparent response speed may be about 1400 msec in FIG. 4 but about 1000 msec in FIG. become able to. Thus, it is possible to make a person watching the display panel feel that the response speed when switching the display data is apparently increased.

(Embodiment 2) FIG. 7 is a functional block diagram showing another embodiment of the electronic apparatus of the present invention.

When the output from the temperature detection circuit 906 is equal to or higher than a preset temperature, the CPU 902 sets the RA
Display data corresponding to the time data at that time is read from M903, and the display data is output to the driver IC 904 and displayed. When there is a change in the displayed time, the CPU 902 reads display data corresponding to the changed time data from the RAM 903, and outputs the display data to the driver IC for display.

On the other hand, when the output from the temperature detection circuit 906 is equal to or lower than the preset temperature, the same processing as that when the input from the external switch 901 described in the first embodiment is performed three times is performed.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to those embodiments and can be variously modified within the scope of the invention described in the claims.

For example, in the above-described embodiment, the case where the present invention is applied to a wristwatch is illustrated. However, the present invention can be applied to other electronic devices such as a stopwatch.

Further, depending on the temperature detected by the temperature detection circuit, the processing time for not displaying the portion to be rewritten can be changed in accordance with the characteristics of the liquid crystal, or the processing time can be changed according to the detected temperature.

Although the conductive rubber is used as a method for electrically connecting the liquid crystal panel to the circuit board, a flexible tape substrate or the like may be used instead.

[0033]

As described above, according to the present invention, even when the response speed of the liquid crystal panel becomes slow, the response speed can be felt fast without largely changing the driving frequency or driving voltage for driving the liquid crystal. Will be able to

Further, the response speed can be increased even if the amount of the liquid crystal material is increased in viscosity due to a low threshold voltage or an increase in steepness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a cross-sectional structure of an embodiment of an electronic device module which is an embodiment of an electronic device according to the invention.

FIG. 2 is a functional block diagram illustrating an embodiment of an electronic apparatus according to the invention.

FIG. 3 is a timing chart of display switching showing an embodiment of the electronic device according to the present invention.

FIG. 4 is a diagram illustrating a response speed when a liquid crystal panel is driven at a certain drive voltage, showing an embodiment of the electronic apparatus according to the present invention.

FIG. 5 is a diagram showing a response speed when a liquid crystal panel showing one embodiment of the electronic apparatus according to the present invention is driven at a certain driving voltage different from FIG. 4;

FIG. 6 shows an apparent response speed when a liquid crystal panel according to an embodiment of the present invention is driven at a certain driving voltage different from that in FIG. 4 and a display switching portion of the liquid crystal panel is turned off in advance. FIG.

FIG. 7 is a functional block diagram illustrating an embodiment of an electronic apparatus according to the invention.

FIG. 8 is a diagram schematically illustrating a main part of an embodiment of an electronic apparatus according to the invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel frame 2 Liquid crystal panel 21 Liquid crystal cell 201 Polarizer 202 Upper glass 203 Lower glass 204 Liquid crystal 205 Polarizer 206 Reflector 3 Circuit board 4 Circuit board frame 5 Conductive rubber 6 Battery 7 Screw 901 Display method changing external switch 902 CPU 903 RAM 904 Driver IC 905 Display element 906 Temperature detection circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/00 348 G09F 9/00 348G G09G 3/04 G09G 3/04 A D 3/20 3/20 A 3/36 3/36 F term (reference) 2H089 HA40 KA17 QA16 TA03 TA07 2H093 NC02 NC21 NC29 NC49 NC50 NC57 NC71 ND02 ND32 NE07 NE10 5C006 AB05 AF62 BB01 BF38 EB05 FA19 5C080 AA10 BB01 BB05 DD01 JJ02 KK05 BB05 BB05 BB05 EE32 EE36 EE40 EE42 EE45 FF03 FF05 FF06 LL07 LL10

Claims (13)

[Claims] 1. An electronic device having a liquid crystal panel for display, comprising: a circuit board on which elements necessary for displaying the liquid crystal panel are mounted; and an element necessary for displaying the liquid crystal panel. An electronic device, comprising: a connection unit for electrically connecting a circuit board to a liquid crystal panel; and a unit for changing a content displayed on the liquid crystal panel and a time for rewriting the display. 2. The electronic device according to claim 1, further comprising means for changing a voltage for driving the liquid crystal panel. 3. The electronic device according to claim 2, further comprising means for changing a voltage for driving the liquid crystal panel by an external input. 4. The electronic device according to claim 1, further comprising an external input switch for changing a content displayed on the liquid crystal panel and a time for rewriting the display. machine. 5. The electronic device according to claim 1, wherein the contents displayed on the liquid crystal panel and the time for rewriting the display are set to the temperature measured by the temperature measuring means near the liquid crystal panel. Electronic equipment characterized by changing according to. 6. The electronic device according to claim 5, further comprising a function of changing a voltage for driving the liquid crystal panel in accordance with the detected temperature. 7. The electronic device according to claim 5, wherein a thermistor is used as the temperature detecting means. 8. The electronic device according to claim 5, wherein the output voltage of the liquid crystal driving IC that changes according to the temperature is used as the temperature detecting means. 9. The electronic device according to claim 1, wherein the liquid crystal panel is electrically connected to a circuit board on which elements necessary for displaying a liquid crystal panel for display are mounted. As connection means for connecting to
An electronic device using a flexible substrate on which a driver IC necessary for driving a liquid crystal panel is mounted. 10. The electronic device according to claim 1, wherein a circuit board on which elements necessary for displaying a liquid crystal panel for display are mounted, and a liquid crystal panel are electrically connected. An electronic device characterized in that an anisotropic conductive rubber is used as a connecting means for connecting to a device. 11. The electronic device according to claim 1, wherein a circuit board on which elements necessary for displaying a liquid crystal panel for display are mounted, and a liquid crystal panel are electrically connected to each other. An electronic apparatus characterized in that a heat seal connector is used as a connection means for connecting to an electronic device. 12. The electronic device according to claim 1, wherein a belt for carrying the electronic device is attached to a case of the electronic device. 13. The electronic device according to claim 1, wherein an outer case of the electronic device has a waterproof structure.