JP2001183624A - Method for driving display of liquid crystal panel, liquid crystal display device, and clock and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of realizing a display mode permitting to give an analog-like and elegant impression. SOLUTION: After a display output Dout is switched off and display contrast Lout becomes 0 and a display pattern has disappeared, a display gray level Vout also becomes a low gray level after a prescribed time, and a liquid crystal driving voltage drops. Thereafter, although the display output Dout is switched on to display another display pattern, the display gray level Vout then remains low, therefore, the display pattern does not appear. Immediately or in a prescribed time after the display output is switched on, the display gray level Vout gradually increases to reach a normal gray level before long.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display driving method for a liquid crystal panel, a liquid crystal display device, a clock and an electronic apparatus, and more particularly to a display control technique for a liquid crystal panel.

[0002]

2. Description of the Related Art In general, a liquid crystal display device provided with a liquid crystal panel may be commercialized as a display device by itself, or may be attached to a display unit of a watch or electronic equipment. . In particular, when the liquid crystal display device is incorporated in various devices such as a wristwatch and a mobile phone, the liquid crystal panel has a specific meaning on the display area of the liquid crystal panel, for example, running out of batteries, types of display modes and operation modes, presence or absence of an incoming call. It is configured to display a display pattern composed of characters, symbols, figures, and the like for indicating such as. in this case,
When it is particularly important to draw the user's attention, the display pattern may be flashed, a notification sound may be emitted by an electronic buzzer or the like, or a vibrator or the like built in the device may be operated. .

In a liquid crystal panel, a pixel area of a specific shape formed in advance to display a specific pattern shape (an area of a shape usable only for expressing one or a plurality of display patterns) is formed in a display area. ) Is formed, and a dot matrix type in which pixel regions of the same shape are simply arranged regularly in a dot matrix shape so that an arbitrary display pattern can be expressed by a combination of pixel regions. There is also a panel.

[0004]

However, in the display mode of the conventional liquid crystal display device, since the display pattern is basically realized by an optical on / off switching operation in each pixel region, the display pattern is erased. When the display pattern flashes, the presence or absence of the display is only repeated, so that the display mode is digital and often gives a mechanical impression, and the display mode has elegance. Difficult to add.

[0005] In particular, in the case of a liquid crystal display device provided with various devices, since the display area and the number of pixel regions are limited, it is not possible to sufficiently secure the definition of the display mode. There is a problem that the display pattern becomes coarse, giving a particularly digital and mechanical impression.

Accordingly, the present invention is to solve the above-mentioned problem, and an object of the present invention is to change a display pattern to a pixel area in a display area when the display pattern is switched or when attention is paid to specific display contents. Provided is a liquid crystal display device that can realize a display mode that can give an analog and elegant impression by controlling display contents by a special method that has not been conventionally performed, instead of a method of turning on and off in units of It is in.

[0007]

According to the present invention, there is provided a liquid crystal panel display driving method for forming a predetermined display pattern on a display area of a liquid crystal panel. When erasing the display pattern displayed on the display area, the contrast of the display pattern is gradually reduced in a visible manner in the process of erasing the display pattern, or the display pattern is displayed on the display area. Is displayed, the control is performed such that the contrast of the display pattern is gradually increased in a visible manner in the appearance process of the display pattern.

According to the present invention, the contrast of the display pattern gradually decreases or increases in a visually recognizable manner in the process of erasing or appearing the display pattern. Also, by reducing or increasing the contrast of the display pattern, an analog and elegant impression can be given to the viewer. In particular, since an analog display mode can be realized on the liquid crystal panel, the degree of impression given to the viewer when changing the display mode or operation mode or displaying a display pattern that calls attention is greatly improved. Becomes possible.

In this case, it is preferable that the period for gradually decreasing or increasing the contrast of the display pattern is set in the range of 0.5 to 3.0 seconds, and particularly, in the range of 0.8 to 1.2 seconds. It is desirable to set.

In another aspect of the present invention, a display driving method for a liquid crystal panel is a method for driving a liquid crystal panel for forming a predetermined display pattern on a display area of the liquid crystal panel.
When erasing the display pattern on the display area, the contrast of the display pattern is substantially periodically increased or decreased in a visible manner in the process of erasing the display pattern, or the display pattern is caused to appear on the display area. At that time,
In the process of appearance of the display pattern, the contrast of the display pattern is substantially periodically increased and decreased in a visible manner.

According to the present invention, by controlling the contrast of the display pattern to increase or decrease substantially periodically in a visually recognizable manner, the degree of impression of the display pattern can be increased, and at the same time, the periodicity of the contrast can be increased. Since the change can be made analog and elegant, it is possible to realize a display mode with a softer impression than the display mode of the conventional digital liquid crystal panel, so that a novel impression different from the conventional display mode is visually recognized. Can be given to others.

In this case, it is preferable to set the contrast increasing / decreasing cycle of the display pattern in a range of 0.5 to 3.0 seconds, and particularly in a range of 0.8 to 1.2 seconds. Is desirable.

Still another aspect of the present invention is a display driving method for a liquid crystal panel for forming a predetermined display pattern on a display area of the liquid crystal panel. When erasing the displayed display pattern, in the process of erasing the display pattern, the contrast of the display pattern is decreased as a whole while being periodically increased or decreased in a visually recognizable manner, or the display pattern is displayed on the display area. Is characterized in that, in the appearance process of the display pattern, the contrast of the display pattern is generally increased and decreased substantially periodically in a visually recognizable manner.

According to the present invention, the display pattern can be erased or made to appear by gradually decreasing or increasing the contrast together with the periodic change of the contrast. Therefore, the degree of impression when the display pattern is erased or increased can be further increased. Will be possible.

In this case, it is preferable to set the contrast increasing / decreasing cycle of the display pattern in a range of 0.5 to 3.0 seconds, and particularly, in a range of 0.8 to 1.2 seconds. Is desirable. Further, it is preferable that the period for gradually decreasing or increasing the contrast of the display pattern as a whole falls within a range of 2 to 10 times the above-mentioned increase / decrease cycle, and particularly, 3 to 10 times.
It is desirable to make it five times.

A still further method of driving a liquid crystal panel according to the present invention is a method of driving a liquid crystal panel for forming a predetermined display pattern on a display area of the liquid crystal panel. While the predetermined display pattern is being displayed, the contrast of the display pattern is increased or decreased substantially periodically in a visually recognizable manner.

In this case, it is preferable to set the contrast increasing / decreasing cycle of the display pattern in a range of 0.5 to 3.0 seconds, and particularly in a range of 0.8 to 1.2 seconds. Is desirable.

In the present invention, it is preferable that the minimum value of the contrast in the contrast increase / decrease cycle is set in a range in which the display pattern can be visually recognized. According to the present invention, since the minimum value of the contrast in the contrast increase / decrease cycle is set in the visible range of the display pattern, the display pattern temporarily disappears while the contrast of the display pattern is increasing / decreasing. Since the display pattern does not occur, the recognition degree of the display pattern is improved as compared with the conventional blinking display.

In the present invention, it is preferable that the contrast of the display pattern is controlled by controlling a voltage applied to the liquid crystal panel. By controlling the liquid crystal panel contrast by controlling the supply voltage to the liquid crystal panel, processing for display data becomes unnecessary, and contrast control can be performed independently of display output switching control. The complexity of the content can be suppressed.

Next, in the liquid crystal display device of the present invention, a liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and sending control data and display data to the liquid crystal driving circuit. Control means, wherein the control means is configured to output a contrast command for controlling the contrast of a display pattern, and the liquid crystal driving circuit directly or indirectly controls the display area based on the contrast command. When erasing the display pattern displayed on the upper, when gradually reducing the contrast of the display pattern in a visible manner in the process of erasing the display pattern, or when causing the display pattern to appear on the display area, In the process of appearance of the display pattern, the display pattern is operated to gradually increase the contrast of the display pattern in a visually recognizable manner. It is characterized in.

According to another liquid crystal display device of the present invention, there is provided a liquid crystal panel having a predetermined display area, a liquid crystal drive circuit for driving the liquid crystal panel, and control data and display data transmitted to the liquid crystal drive circuit. Control means for sending a contrast command for controlling a contrast of a display pattern, and the liquid crystal driving circuit directly or indirectly controls the display based on the contrast command. When erasing the display pattern displayed on the area, the contrast of the display pattern is substantially periodically increased or decreased in a visible manner in the process of erasing the display pattern, or the display pattern appears on the display area. When making the display pattern appear, the contrast of the display pattern is increased or decreased substantially periodically in a visible manner. Characterized in that it operates so that.

Still another liquid crystal display device of the present invention is a liquid crystal panel having a predetermined display area, a liquid crystal drive circuit for driving the liquid crystal panel, and control data and display data provided to the liquid crystal drive circuit. Control means for sending a contrast command for controlling the contrast of the display pattern, and the liquid crystal drive circuit erases the display pattern displayed on the display area. In doing so, in the process of erasing the display pattern, the contrast of the display pattern is reduced as a whole while being increased or decreased substantially periodically in a visually recognizable manner, or when the display pattern appears on the display area,
In the appearance process of the display pattern, the contrast of the display pattern is increased or decreased substantially periodically in a visually recognizable manner so as to increase as a whole.

According to still another liquid crystal display device of the present invention, there is provided a liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and control data and display data for the liquid crystal driving circuit. Control means for sending a contrast command for controlling the contrast of the display pattern, and the liquid crystal drive circuit directly or indirectly based on the contrast command, During display of the display pattern on the display area, the contrast of the display pattern is increased or decreased substantially periodically in a visually recognizable manner.

In the present invention, it is preferable that the minimum value of the contrast in the contrast increase / decrease cycle is set in a range in which the display pattern can be visually recognized.

In the present invention, it is preferable that the contrast command controls a supply voltage supplied from a driving power supply circuit to the liquid crystal driving circuit.

Next, a timepiece according to the present invention includes the above-mentioned liquid crystal display device, and controls the change of the contrast of the display pattern by the contrast command when the display mode on the display area is changed or when a specific display pattern is displayed. It is characterized by having such a configuration.

According to another aspect of the invention, there is provided an electronic apparatus including the liquid crystal display device, wherein when the display mode on the display area is changed or when a specific display pattern is displayed, the contrast of the display pattern is changed and controlled by the contrast command. It is characterized by having such a configuration.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a liquid crystal panel display driving method and a liquid crystal display device according to the present invention. The present embodiment can be applied to a digital clock and various electronic devices in which a display area of a liquid crystal panel is arranged on a time display section of a wristwatch.

FIG. 1 is a configuration block diagram showing a schematic configuration of the liquid crystal display device of the present embodiment. The liquid crystal panel 10 has a substantially rectangular display area 10a.
It is composed of a passive matrix type liquid crystal display panel using TN type liquid crystal. A liquid crystal driving circuit 11 is connected to the liquid crystal panel 10, and the liquid crystal driving circuit 11
(Microprocessor unit) 12. The MPU 12 has a control input unit 1
The MPU 12 is configured to be able to perform an operation on the operation state of the MPU 12 by manually operating the control input unit 13 or by introducing an external control signal. The driving power supply circuit 14 is M
The liquid crystal driving voltage Vc based on the control signal from the PU 12
1 to Vc5 are output to the liquid crystal drive circuit 11.

The liquid crystal drive circuit 11 supplies a common potential and a segment potential to the liquid crystal panel 10 at a predetermined timing. The liquid crystal panel 10 has, for example, 17 common terminals COM0 to COM16 and 40 segment terminals S
68 corresponding to a pixel region having EG0 to SEG39
It has 0 (40 × 17) display segments. The liquid crystal drive circuit 11 outputs a predetermined common signal to each of the common terminals COM0 to COM16, and outputs a predetermined segment signal to each of the segment terminals SEG0 to SEG39. In accordance with the number of display segments, the liquid crystal drive circuit 11 outputs a plurality of common signals synchronized with a predetermined frame period for time-division driving, and supplies the supplied segment potential during a display period determined by the common signals. , A voltage is applied to each display segment, and the display mode of each display segment is thereby determined.

The MPU 12 includes a CPU (Central Processing Unit) (not shown), storage means (memory), a clock signal for operating the CPU, an oscillator for forming various timing signals and control signals, and data and control signals. Input / output means for exchanging signals. Based on the display program and predetermined parameters recorded in the storage means, and various setting values inputted through the input / output means, M
The PU 12 sends liquid crystal driving data (display data and control data) to the liquid crystal driving circuit 11. The storage means includes a ROM for storing a display program and predetermined parameters, and a RAM for recording temporary data, control parameters, input / output data, and the like.

FIG. 6 shows a memory map of an input / output memory for recording liquid crystal driving data formed by the MPU 12. This input / output memory has an address F00 in units of 4 bits of four registers D0 to D3.
A display memory area from 0H to F24EH and a control memory area from addresses FF60H to FF62H in units of 4 bits of four registers D0 to D3 are set.

Each data bit in the display memory area corresponds to each display segment of the liquid crystal panel. When a certain data bit is 1, the liquid crystal drive circuit 11 turns on the corresponding display segment of the liquid crystal panel 10, When the data bit is 0, the liquid crystal drive circuit 11 turns off the corresponding display segment of the liquid crystal panel 10.

In the control memory area, the address FF6
The four bits of the registers S00 to S03 at 0H are control bits for switching the drive duty of the liquid crystal panel by the registers S03 and S02, the control bit for switching the reference voltage of the liquid crystal panel by the register S01, and the register S01 by the register S01 for the liquid crystal panel. The control bits for turning on and off the power are recorded. Regarding the four bits of the registers S10 to S13 in the address FF61H, S13 is a general-purpose register, S12 is a control bit for turning off all display segments of the liquid crystal panel, and S11 is turning on all display segments of the liquid crystal panel. S10 is a control bit for recording a control bit for selecting a display memory area at the time of low duty driving (１ ／ duty driving).

In the control memory area, the address FF6
The 4 bits of the registers LC0 to LC3 in 2H are control bits for adjusting the liquid crystal driving voltages Vc1 to Vc5 to adjust the display contrast of the liquid crystal panel. The present embodiment is configured so that the display contrast of the liquid crystal panel can be adjusted to 16 gradations by using these control bits. For example, the gradations 0 to 16 represented by the control bits set the reference voltage Vc1 to 0.
It is set at equal potential intervals within the range of 975 to 1.200 v. The other liquid crystal driving voltages Vc2 to Vc5 all have a predetermined relationship with respect to the reference potential Vc1, for example, a potential that is a constant multiple.

Each control bit in the above-mentioned control memory area is controlled according to a display program stored in the MPU 12, and according to the value of each control bit, the liquid crystal driving circuit 1
1 and the driving power supply circuit 14 operate. Therefore, the operation state of the liquid crystal driving circuit 11 and the driving power supply circuit 14 changes in real time by rewriting the value of the control bit, and as a result, the display mode of the liquid crystal panel 10 changes.

FIG. 2 is a graph showing a temporal change of one of the display modes of the present embodiment. In this graph, the display output Dout schematically indicates whether or not a predetermined display segment is driven by the common signal and the segment signal so as to be turned on. When the display output Dout is high, The liquid crystal drive circuit 11 operates so that the display data corresponding to the display segment is 1 and the display segment is turned on. When the display output Dout is low, the display data corresponding to the display segment is 0. This indicates that the liquid crystal drive circuit 11 is operating to turn off the display segment. The display gradation Vout indicates the gradation set by the control bits LC0 to LC3, and indicates that as the gradation increases, the liquid crystal driving voltages Vc1 to Vc5 output from the driving power supply circuit 14 increase. . Further, the display contrast Lout indicates the contrast value of the corresponding display segment in the display area of the liquid crystal panel 10.

In this embodiment, as shown in FIG. 2, when a certain display pattern disappears and another display pattern appears, the display output Dout is turned off, the display contrast Lout becomes 0, and the display contrast becomes 0. After the pattern disappears, the display gradation Vout also becomes a low gradation (for example, about 0 to 4) after a predetermined time, and the liquid crystal driving voltage decreases. After that, the display output Dout is turned on in order to make another display pattern appear.
Since out remains low, no display pattern appears. Immediately after the display output Dout is turned on or a predetermined time after that, the display gradation Vout gradually increases little by little (for example, by increasing the gradation by two steps), and eventually reaches a normal gradation (for example, about 12 to 16). ) Is reached. Along with this, the display contrast Lout also gradually increases, and eventually reaches the normal contrast.

Display gradation Vout and display contrast L
The period during which the out gradually increases is set within a range in which the viewer can sufficiently feel the change (increase) in the display contrast. That is, if the period is short, it is felt that the display is only turned on and off, and it becomes impossible to recognize a change in contrast. On the other hand, if the period is too long, it takes time until the display appears, which may be erroneously recognized as a failure, and the usability (the visibility of the display) deteriorates. Therefore, the above period is 0.5 to 3 seconds, particularly 0.8 to 3 seconds.
It is preferable to set within the range of 1.2 seconds.

In the above display mode, the display output Dou
The display gradation Vout is shifted to a low gradation immediately in conjunction with the OFF operation of t or within a predetermined time thereafter, and immediately or at a predetermined timing thereafter in conjunction with the ON operation of the display output Dout. The gradual increase operation may be started. In addition, the display gradation Vo by a program in advance.
The modulation timing of ut may be predetermined. Further, the display gradation Vout is synchronized with the display output Dout,
The display gradation Dout may be slowly increased only when the display output Dout shifts from the OFF state to the ON state, and may be configured by a program or a predetermined circuit configuration. In the above-described display mode, the change in the display contrast when another display pattern appears after a certain display pattern has been erased has been described, but when a new display pattern appears, it has nothing to do with the past display pattern. Alternatively, the display contrast may gradually increase from a low state to a high state in accordance with the appearance timing of a new display pattern.

Note that, contrary to the display mode shown in FIG. 2, it is also possible to control so that the display contrast Lout of the display pattern is gradually reduced when the display pattern is erased. In this case, the gradual decrease operation of the display gradation Vout may be started a predetermined time before the timing when the display output Vout shifts from the on state to the off state. Furthermore, the operation of gradually decreasing the display contrast when such a display pattern is erased and the operation of gradually increasing the display contrast when the above-described display pattern appears may be performed together.

Next, another display mode of the liquid crystal display device according to the present invention will be described with reference to FIG. FIG. 3 shows a display output D when a certain display pattern is erased and then another display pattern appears, as in FIG.
out, display gradation Vout, display contrast Lout
The change with time is shown. In this display mode, after the display output Dout switches from the off state to the on state, the display gradation Vout shifts from a low state to a state in which the display gradation Vout periodically increases and decreases for a predetermined period, and thereafter, the display gradation Vout changes to a high state. Will be maintained. As a result, the display contrast L
When the display pattern is switched according to the display gradation Vout or a new display pattern appears, the contrast periodically increases or decreases for a predetermined period, and the display pattern changes or the new display pattern changes. Emergence can be emphasized. In this case, the contrast of the display pattern is controlled to be increased / decreased instead of the conventional blinking operation (on / off control) of the display pattern. It is possible to provide an elegant display mode.

In the display mode shown in FIG. 3, as described above, the operation of increasing or decreasing the display contrast may be performed not when the display pattern appears but when the display pattern is erased. A contrast increase / decrease cycle may be generated both at the time of appearance and at the time of erasure.

In the case where the display contrast is periodically increased or decreased in this way, it is preferable that the contrast increase / decrease cycle is set to such an extent that a viewer can recognize it.
For example, the contrast increase / decrease cycle is preferably from 0.5 to 3.0 seconds, and particularly preferably from 0.8 to 1.2 seconds. This is because if the increasing / decreasing cycle is short, it cannot be distinguished from the blinking operation, and if the increasing / decreasing cycle is long, it becomes difficult to visually sense the effect of changing the contrast. Further, it is preferable that the increase or decrease of the display contrast is set to such an extent that the display pattern does not completely disappear and can be viewed thinly even at the contrast value at the time of decrease (that is, the minimum value of the contrast). By doing so, there is no period in which the display pattern cannot be completely visually recognized, so that the degree of recognition of the display pattern is improved as compared with the conventional blinking operation.

Next, another display mode will be described with reference to FIG. In FIG. 4, similarly to the display modes shown in FIGS. 2 and 3, when a certain display pattern is erased and another display pattern appears, the display output Dout, the display gradation Vout, and the display contrast are displayed. The change of Lout with time is shown. In this display mode, when the display pattern appears, the display gradation Vout
Is increased and decreased as a whole, and the display contrast Lout is changed in accordance with the overall increase, so that the display contrast is finally controlled to the normal display contrast. In this case, when the display pattern is erased, not when the display pattern appears, the display gradation Vout is gradually decreased as a whole while periodically increasing and decreasing, and the display pattern gradually disappears while repeating the change in brightness. May be.

In this display mode, the impression of the display pattern is determined by the setting of the contrast increase / decrease cycle of the display pattern and the whole contrast increase or decrease period. The contrast increase / decrease cycle can be considered in the same manner as the display mode shown in FIG. 3 described above, and the entire contrast increase or decrease period is 2 to 10 times, particularly 3 to 10 times, the display mode shown in FIG. It is desirable to set it within the range of 5 times (that is, the contrast increase / decrease cycle is repeated 2 to 10, especially 3 to 5 cycles).
In addition, it is desirable that the minimum value of the contrast in the increase / decrease process be set in a contrast range that can be visually recognized by the viewer, as in the display mode illustrated in FIG.

Finally, still another display mode will be described with reference to FIG. FIG. 5 shows a temporal change of the display output Dout, the display gradation Vout, and the display contrast Lout similarly to FIGS. 2 to 4 described above. In this display mode, in order to indicate a specific display pattern, the display gradation Vout is periodically increased or decreased during a period from when the display output is turned on to when the display output is turned off. The display contrast of the pattern is configured to increase and decrease periodically. By doing so, the display pattern can be emphasized and shown, and the degree of recognition of the display pattern by the viewer can be increased.

Also in this display mode, it is preferable that the contrast increase / decrease cycle is set to such an extent that a viewer can recognize it. For example, the contrast increasing / decreasing cycle is preferably 0.5 to 3.0 seconds, and particularly preferably 0.1 to 3.0 seconds.
It is desirably 8 to 1.2 seconds. This is because if the increasing / decreasing cycle is short, it cannot be distinguished from the blinking operation, and if the increasing / decreasing cycle is long, it becomes difficult to visually sense the effect of changing the contrast. Further, it is preferable that the increase or decrease of the display contrast is set to such an extent that the display pattern does not completely disappear and can be viewed thinly even at the contrast value at the time of decrease (that is, the minimum value of the contrast). By doing so, there is no period in which the display pattern cannot be completely visually recognized, so that the degree of recognition of the display pattern is further improved as compared with the conventional blinking operation.

As a display pattern in the above-described embodiment, any pattern can be visually recognized, such as letters, symbols, numbers, and various figures (pictures).
It does not matter what. Further, the gradation of the display gradation on the control side (for example, the gradation value of the liquid crystal drive voltage in the case of the present embodiment) may be set based on the state of the display contrast realized in the liquid crystal panel. preferable. That is, according to the display characteristics of the liquid crystal panel,
By setting the change in the display gradation so as to obtain the desired change in the display contrast, it is possible to cause the viewer to recognize the graceful analog-like change in contrast.

The display driving method for a liquid crystal panel and the liquid crystal display device according to the present invention are not limited to the illustrated examples described above, and various changes can be made without departing from the gist of the present invention. Of course.

[0051]

As described above, according to the present invention,
In the process of erasing or appearing the display pattern, the contrast of the display pattern gradually decreases or increases in a visually recognizable manner, or the contrast of the display pattern increases or decreases substantially periodically. Also in the liquid crystal panel, an analog and elegant impression can be given to the viewer by reducing or increasing the contrast of the display pattern. In particular, since an analog display mode can be realized on the liquid crystal panel, the degree of impression and the degree of recognition given to the viewer when changing the display mode or operation mode or displaying a display pattern that calls attention are greatly increased. Can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram illustrating a schematic configuration of an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a view for explaining one display mode displayed on a display area of a liquid crystal panel realized by the embodiment;
4 is a graph for explaining the operation, which shows a temporal change of a display output, a display gradation, and a display contrast.

FIG. 3 is a graph for explaining an operation showing a change over time of a display output, a display gradation, and a display contrast for explaining another display mode displayed on a display area of a liquid crystal panel realized by the embodiment. It is.

FIG. 4 is a view for explaining an operation showing a temporal change of a display output, a display gradation, and a display contrast for explaining still another display mode displayed on a display area of a liquid crystal panel realized by the embodiment. It is a graph.

FIG. 5 is an operation explanatory diagram showing a change over time of a display output, a display gradation, and a display contrast for explaining still another display mode displayed on a display area of a liquid crystal panel realized by the embodiment. It is a graph of.

FIG. 6 is a memory map showing the contents of a display memory area for storing display data for determining the operation of the liquid crystal drive circuit and a control memory area for storing control data in the embodiment.

[Explanation of symbols]

 Reference Signs List 10 liquid crystal panel 10a display area 11 liquid crystal drive circuit 12 MPU 13 control input unit 14 drive power supply circuit Dout display output Vout display gradation Lout display contrast Vc1 to Vc5 liquid crystal drive potential COM0 to COM16 common terminal SEG0 to SEG39 segment terminal

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H093 NA07 NA51 NC02 NC13 NC49 NC50 ND03 ND06 ND60 NF05 NF13 5C006 AA16 AF44 AF51 AF52 BB01 BF08 BF15 BF29 BF42 EC08 FA56 5C080 AA10 BB01 DD04 DD21 EE29 JJ49 JJ04 JJ04 KK04

Claims (20)

[Claims] 1. A display driving method for a liquid crystal panel for forming a predetermined display pattern on a display area of a liquid crystal panel, wherein the display pattern is erased when the display pattern displayed on the display area is erased. In the erasing process, the contrast of the display pattern is gradually reduced in a visually recognizable manner,
Alternatively, when a display pattern is caused to appear on the display area, control is performed so as to gradually increase the contrast of the display pattern in a visible manner in a process of appearance of the display pattern, wherein the display driving of the liquid crystal panel is performed. Method. 2. The method according to claim 1, wherein the period for gradually decreasing or increasing the contrast of the display pattern is 0.5 to
A display driving method for a liquid crystal panel, wherein the display driving time is set within a range of 3.0 seconds. 3. A display driving method for a liquid crystal panel for forming a predetermined display pattern on a display area of a liquid crystal panel, wherein the display pattern is erased when the display pattern is erased on the display area. In, when the contrast of the display pattern is increased or decreased substantially periodically in a visually recognizable manner, or when the display pattern appears on the display area,
A display driving method for a liquid crystal panel, wherein a contrast of the display pattern is substantially periodically increased or decreased in a visible manner in the appearance process of the display pattern. 4. A display driving method for a liquid crystal panel for forming a predetermined display pattern on a display area of the liquid crystal panel, wherein the display pattern is erased when the display pattern displayed on the display area is erased. In the erasing process, the contrast of the display pattern is reduced as a whole while being increased or decreased substantially periodically in a visually recognizable manner, or when a display pattern appears on the display area, A display driving method for a liquid crystal panel, wherein the contrast of a display pattern is increased as a whole while being substantially periodically increased and decreased in a visible manner. 5. A display driving method for a liquid crystal panel for forming a predetermined display pattern on a display area of a liquid crystal panel, wherein a contrast of the display pattern is displayed while the predetermined display pattern is being displayed on the display area. A display driving method for a liquid crystal panel, wherein the number is substantially periodically increased and decreased in a visually recognizable manner. 6. The liquid crystal panel according to claim 3, wherein an increase / decrease cycle of the contrast of the display pattern is set within a range of 0.5 to 3.0 seconds. Display driving method. 7. The display pattern according to claim 3, wherein a contrast increase / decrease cycle of the display pattern is 0.5 to 3.0.
A display driving method for a liquid crystal panel, wherein the period is set within the range of seconds, and the period for gradually decreasing or increasing the contrast of the display pattern as a whole is within a range of 2 to 10 times the increase / decrease cycle. 8. A display driving method for a liquid crystal panel according to claim 3, wherein a minimum value of the contrast in a contrast increasing / decreasing cycle is set within a range in which the display pattern can be visually recognized. 9. The display driving method for a liquid crystal panel according to claim 1, wherein contrast control of the display pattern is performed by controlling a supply voltage to the liquid crystal panel. 10. A liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and control means for sending control data and display data to the liquid crystal driving circuit. The means is configured to output a contrast command for controlling the contrast of the display pattern, and the liquid crystal drive circuit directly or indirectly erases the display pattern displayed on the display area based on the contrast command. When the display pattern is erased, the contrast of the display pattern is gradually reduced in a visually recognizable manner, or when the display pattern appears on the display area, the display pattern appears in the appearance process of the display pattern. A liquid crystal display operable to gradually increase the contrast of a pattern in a visible manner. Location. 11. The method according to claim 10, wherein the period in which the contrast of the display pattern is gradually reduced or increased is 0.1.
A liquid crystal display device characterized by being set within a range of 5 to 3.0 seconds. 12. A liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and control means for sending control data and display data to the liquid crystal driving circuit. The means is configured to output a contrast command for controlling the contrast of the display pattern, and the liquid crystal drive circuit directly or indirectly erases the display pattern displayed on the display area based on the contrast command. When the display pattern is erased, the contrast of the display pattern is substantially periodically increased or decreased in a visually recognizable manner, or when the display pattern is caused to appear on the display area, Characterized by operating to increase or decrease the contrast of the display pattern substantially periodically in a visually recognizable manner. The liquid crystal display device that. 13. A liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and control means for sending control data and display data to the liquid crystal driving circuit. The means is configured to output a contrast command for controlling the contrast of the display pattern. The liquid crystal drive circuit, when erasing the display pattern displayed on the display area, in the process of erasing the display pattern. Lowering the contrast of the display pattern as a whole while increasing or decreasing it substantially periodically in a visually recognizable manner,
Alternatively, when a display pattern is caused to appear on the display area, an operation is performed such that the contrast of the display pattern is increased or decreased substantially periodically in a visible manner in a process of appearance of the display pattern. Characteristic liquid crystal display device. 14. A liquid crystal panel having a predetermined display area, a liquid crystal driving circuit for driving the liquid crystal panel, and control means for sending control data and display data to the liquid crystal driving circuit. The means is configured to output a contrast command for controlling the contrast of the display pattern, wherein the liquid crystal drive circuit is directly or indirectly based on the contrast command, during display of the display pattern on the display area, A liquid crystal display device operable to substantially periodically increase and decrease the contrast of the display pattern in a visible manner. 15. The liquid crystal according to claim 12, wherein an increase / decrease cycle of contrast of the display pattern is set in a range of 0.5 to 3.0 seconds. Display device. 16. The method according to claim 12, wherein
The increase / decrease cycle of the contrast of the display pattern is 0.5 to
The liquid crystal display device is set in a range of 3.0 seconds, and a period of gradually decreasing or increasing the contrast of the display pattern as a whole is set in a range of 2 to 10 times the increase / decrease cycle. . 17. The liquid crystal display according to claim 12, wherein a minimum value of the contrast in the contrast increasing / decreasing cycle is set in a range in which the display pattern can be visually recognized. apparatus. 18. The liquid crystal display according to claim 10, wherein the contrast command is to control a supply voltage supplied from a driving power supply circuit to the liquid crystal driving circuit. Liquid crystal display. 19. The liquid crystal display device according to claim 10, wherein the liquid crystal display device changes the display mode on the display area or displays a specific display pattern by the contrast command. A timepiece configured to change and control the contrast of a pattern. 20. The liquid crystal display device according to claim 10, wherein the display is performed by the contrast command when a display mode on the display area is changed or when a specific display pattern is displayed. An electronic device characterized by being configured to change and control the contrast of a pattern.