JPH07168541A - Contrast control device for displaying display - Google Patents

Abstract

PURPOSE:To provide a contrast control device for a displaying display capable of maintaining always an optimum contrast automatically without the operation of an user even though the display mode of the displaying display is changed over. CONSTITUTION:When the display mode of an LCD display 1 is changed over, an optimum contrast value stored in a VIDEO BIOS ROM 4 is set to a contrast adjusting means 5 by a CPU 3 and the means 5 is controlled with it and then the contrast of the LCD display 1 is adjusted to be in a state optimum to the changed-over display mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contrast control device for a display for adjusting the contrast of a display such as an LCD display provided in a notebook personal computer (hereinafter referred to as a personal computer).

[0002]

2. Description of the Related Art Conventionally, as for the contrast of an LCD / display, as shown in FIG. 7, the supply voltage from a liquid crystal driving power source 8 is varied by a contrast adjusting volume 9 so that the user can see it most easily. It was adjusted (that is, the optimum contrast was obtained). Note that FIG.
In the figure, 1 is an LCD display, 2 is an LCD display controller, and 7 is a power supply for logic circuits.

[0003]

However, in the notebook type personal computer and the like, the display mode of the LCD / display (the mode depending on the difference in display resolution, the mode depending on the difference in the number of gradations, the inversion / non-inversion display mode of the pixel, the orientation) There are many up / down or left / right reversed display modes, etc., and the visibility of the display on the display changes for each display mode. Therefore, each time the display mode is switched, the display in that display mode is changed. I had to readjust the contrast so that the information above was most legible. In particular, in a laptop computer, etc., the display mode of the display for display is often switched during use, and the user must adjust the contrast each time the display mode is switched. Had a problem that it was very troublesome.

The present invention has been made in view of the above problems of the above-mentioned prior art, and an object thereof is to allow a user to operate even if the display mode of the display for display is switched. It is an object of the present invention to provide a contrast control device for a display for display, which can always automatically maintain the optimum contrast without doing so.

[0005]

In order to achieve the above object, the present invention provides a contrast adjusting volume 9 shown in FIG.
Is replaced with, for example, an electronic volume (which indicates a resistance value according to a value set in a register) 10 shown in FIG. 5, and an appropriate value is set in the electronic volume 10.
Contrast adjusting means for adjusting the contrast, a contrast value storing means for storing an optimal contrast value for each preset display mode of the display, and a display mode for switching the display. And a control unit for controlling the contrast adjustment unit by setting the optimum contrast value stored in the contrast value storage unit in the contrast adjustment unit.

Brightness adjusting means for adjusting the brightness of the display for display, brightness value storage means for storing an optimum brightness value for each display mode of the display for display set in advance, and the display for display It is preferable to further include second control means for controlling the brightness adjusting means by setting the optimum brightness value stored in the brightness value storing means in the brightness adjusting means when the display mode is switched.

Further, temperature measuring means for measuring the ambient temperature of the display for display, and the optimum contrast value or brightness value set in the contrast adjusting means or the brightness adjusting means based on the measured value of the temperature measuring means are corrected. It is preferable to provide a correction means for

[0008]

When the display mode of the display for display is switched, the optimum contrast value stored in the contrast value storage means is set in the contrast adjusting means by the control means, and the contrast adjusting means is controlled. The contrast is automatically adjusted to the optimum state for the switched display mode.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a contrast control device for a display for display according to a first embodiment of the present invention, in which 1 is an LCD display (display for display), which is an LCD display controller. Controlled by 2. 3 is LCD
A CPU (Central Processing Unit) which is a control means for controlling the entire system including the display controller 2. LCD among the programs executed by the CPU 3
The optimum contrast value for each display mode of the LCD / display 1 that is preset with a program for performing basic control of the display 1 is VIDEO / B.
It is stored in the IOS / ROM (storage means) 4. Reference numeral 5 is a contrast adjusting means, and by setting an appropriate value by software control, the LCD display 1
To adjust the contrast. Reference numeral 7 is a logic circuit power source, and 8 is a liquid crystal driving power source.

Next, the operation of the contrast control device for a display for display according to this embodiment having the above-mentioned structure will be described.
When the CPU 3 draws information on the LCD / display 1 or changes its display mode in response to a request from an application program or the like, the V
This is performed by executing a program stored in the IDE / BIOS / ROM 4 and transferring a command or data to the LCD / display / controller 2 by the program.

A novel point of the contrast control device for a display according to the present embodiment, which is different from the conventional one, is L
The optimum contrast value for each display mode of the CD / display 1 is stored in the VIDEO / BIOS / ROM 4. When changing the display mode of the LCD / display 1, the CPU 3 transfers a command for switching to the new display mode to the LCD / display controller 2 and, at the same time, sets the optimum contrast value for the new display mode to VIDEO.・ BIOS ・ RO
It is taken out from M4, and the taken out contrast value is set in the contrast adjusting means 5. The contrast adjusting means 5 is controlled by the CPU 3 to adjust the contrast of the LCD / display 1 so as to be in the optimum state for the switched display mode. As a result, the contrast of the LCD / display 1 becomes the optimum state for the switched display mode.

According to the contrast control device for a display for display of the present embodiment, even if the display mode of the LCD / display 1 is frequently switched, the optimum contrast is always maintained, and the user can display the display on the LCD / display 1. It is not necessary to adjust the contrast each time the mode is switched, and the inconvenience is released.

Further, as the contrast adjusting means 5,
The electronic volume 10 shown in FIG. 5 is used, or a transistor 12 is used instead of the electronic volume 10 as shown in FIG. 6, for example, and an analog output corresponding to a digital value set by the CPU 3 is used. It is also possible to adjust the contrast by controlling the voltage. In addition, in FIG. 6, 11 is a D / A converter.

(Second Embodiment) In the above-described first embodiment, the display state of the LCD / display 1 is maintained in the optimum contrast state by adjusting only the contrast of the LCD / display 1. The contrast is closely related to the brightness, and the display quality of the display for display is improved by adjusting the brightness and the contrast in pairs. Further, in the case of a semi-transmissive display for display, when an application operating in a certain display mode is always used outdoors, the backlight may be off (the brightness value is the minimum value).

A second embodiment, which is an improvement of the first embodiment described above in view of the above points, will be described with reference to FIG. Figure 2
FIG. 6 is a block diagram showing a configuration of a contrast control device for a display for displaying according to a second embodiment of the present invention,
In the figure, the same parts as those in FIG. 1 of the first embodiment described above are designated by the same reference numerals.

The difference of this embodiment from the first embodiment is that a brightness adjusting means 6 is added to the configuration of FIG. The brightness adjusting unit 6 adjusts the brightness of the LCD / display 1.

The basic operation of the contrast control device for a display according to the present embodiment is the same as that of the first embodiment, but particularly in the case of the present embodiment, an optimum contrast value is previously set for each display mode. VIDEO / BIOS / ROM4
The optimum brightness value for each display mode is also stored in advance in the VIDEO / BIOS / ROM 4. When changing the display mode of the LCD / display 1, the CPU 3 transfers a command for switching to the new display mode to the LCD / display / controller 2, and at the same time, the contrast value and the brightness which are optimum for the new display mode. Value VI
It is taken out from the DEO / BIOS / ROM 4, and the taken out contrast value and brightness value are set in the contrast adjusting means 5 and the brightness adjusting means 6. As a result, the contrast adjusting means 5 is controlled by the CPU 3 to adjust the contrast of the LCD / display 1 to be in the optimum state for the switched display mode, and the brightness adjusting means 6 is controlled by the CPU 3 to control the LCD. -Adjust the brightness of the display 1 to the optimum state for the switched display mode.
As a result, the contrast of the LCD / display 1 becomes the optimum state for the switched display mode.

According to the contrast control device for the display for display of this embodiment, the LCD display 1 is constituted by the contrast adjusting means 5 and the brightness adjusting means 6.
Since both the contrast and the brightness are adjusted, the display quality of the LCD display 1 is improved as compared with the first embodiment. In addition, it is possible to automatically perform on / off control of the backlight of the LCD / display 1, reducing the operational burden on the user, and forgetting to switch off the backlight when using it outdoors. Useless power consumption can be eliminated.

Similarly to the contrast adjusting means 5, the brightness adjusting means 6 can be realized by replacing the conventional brightness adjusting volume with an electronic volume or the like.

The optimum contrast value is a value when the user feels the most visible value among the values that can be set in the contrast adjusting means 5. The optimum brightness value is a value when the user feels the most visible value among the values that can be set in the brightness adjusting means 6. However, these values change depending on the display mode and use environment. In the present invention, the optimum value at that time is automatically reset in response to the change.

More specifically, the user selects each mode, and in each mode, the contrast, brightness, etc. are adjusted by the volume, etc., and the switch, etc. are pushed, the mode, brightness value and contrast value at that time are selected. May be stored. By doing so, the optimum value in each mode can be set.

(Third Embodiment) The display characteristics of the LCD / display 1 are greatly affected by changes in the ambient temperature of the LCD / display 1. Therefore, when a portable device such as a pen-input type personal computer is taken out from indoors, or immediately after the inverter for the backlight near the LCD / display 1 is turned from the off state to the on state ( I had to adjust the contrast to get a lot of heat.

A third embodiment (improvement of the second embodiment), which is an improvement of the first embodiment or the second embodiment described above in view of the above point, will be described with reference to FIG. FIG. 2 shows the third aspect of the present invention.
FIG. 3 is a block diagram showing a configuration of a contrast control device for a display for display according to an embodiment, in which the same parts as those in FIG. 2 of the second embodiment described above are denoted by the same reference numerals.

The present embodiment differs from the second embodiment in that the temperature measuring means 13 is added to the configuration of FIG. This temperature measuring means 13 is an LCD / display 1
The ambient temperature of is measured regularly.

The basic operation of the contrast control device for a display according to this embodiment is the same as that of the second embodiment, but particularly in the case of this embodiment, the temperature measuring means 13 is L
The ambient temperature of the CD / display 1 is regularly measured, and the measured temperature is monitored by the CPU 3. And
When a change in the ambient temperature of the LCD / display 1 is recognized, the CPU 3 appropriately increases or decreases the contrast value and the brightness value set in the contrast adjusting unit 5 and the brightness adjusting unit 6 according to the degree of the temperature change. LCD display 1 by (correction)
The contrast and brightness of the display state can be adjusted to the optimum state.

According to the contrast control device for a display for display of the present embodiment, the contrast and brightness of the LCD / display 1 are adjusted in accordance with the change in the ambient temperature of the LCD / display 1, so that it is like a pen input personal computer. Even in a device in which the usage environment changes drastically with temperature, the display quality of the LCD / display 1 can always be maintained in an optimum state without adjusting the contrast and brightness each time the usage environment changes.

(Fourth Embodiment) In the first to third embodiments described above, the LCD display controller 2 is used.
The conventional VIDEO, BIOS, and ROM 4 are used for the contrast adjusting means 5 and the brightness adjusting means 6 in order to carry out the present invention. The program for setting the brightness value must be extended. However, in some cases V
There are times when it is not possible to change the IDE / BIOS / ROM4.

A fourth embodiment (improvement of the third embodiment), which is an improvement of the above-described first to third embodiments in view of the above points, will be described with reference to FIG. FIG. 4 is a block diagram showing a configuration of a contrast control device for a display according to a fourth embodiment of the present invention. In the figure, the same parts as those in FIG. 3 of the third embodiment described above are designated by the same reference numerals. It is attached.

The present embodiment differs from the third embodiment in that in the third embodiment, a program for setting the optimum contrast value and brightness value for the display mode is set in the contrast adjusting means 5 and the brightness adjusting means 6. This is to expand the function so that the LCD / display controller 2 can perform the same work as that performed by the CPU 3.

That is, in FIG. 4, the LCD display controller 2 stores in advance the optimum contrast value and brightness value for the display mode to be set in the contrast adjusting means 5 and the brightness adjusting means 6 for each display mode. The display mode of the LCD / display 1 at that time is recognized from the command or data transferred from the CPU 3, and the optimum contrast value and brightness value for the display mode are set in the contrast adjusting means 5 and the brightness adjusting means 6. It was made possible.

According to the contrast control device for a display for display of the present embodiment, the function of the LCD / display controller 2 is expanded to realize the VIDEO / B.
It is not necessary to change the IOS / ROM 4, and the conventional one can be used as it is.

[0033]

Since the present invention is configured as described above, it has the following effects.

According to the contrast control device of the display for display of claim 1, when the display mode of the display for display is switched, the control means causes the optimum contrast value stored in the contrast value storage means to the contrast adjusting means. Since the contrast adjustment means is set and the contrast of the display for display is automatically adjusted to the optimum state for the switched display mode, even if the display mode of the display for display is switched, The optimum contrast can always be maintained automatically, without having to operate.

According to the contrast control device for a display for display of the present invention, both the contrast and the brightness of the display for display are adjusted by the contrast adjusting means and the brightness adjusting means, so that the display quality of the display for display is improved. . In addition, it is possible to automatically control the on / off of the backlight of the display for display, which can reduce the operational burden on the user and waste the switch of the backlight when it is used outdoors. Power consumption can be eliminated.

According to the contrast control device for a display for display of the present invention, the contrast and brightness of the display for display are adjusted according to changes in the ambient temperature of the display for display. Even in a device whose usage environment changes drastically, the display quality of the display for display can always be ensured in an optimum state without adjusting the contrast and brightness each time the usage environment changes.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a contrast control device for a display for display according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a contrast control device for a display for display according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a contrast control device for a display for display according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a contrast control device for a display for display according to a fourth embodiment of the present invention.

5 is a diagram similar to FIG. 1 when an electronic volume is used as a contrast adjusting means.

FIG. 6 is a diagram similar to FIG. 1 when a transistor is used as a contrast adjusting means.

FIG. 7 is a block diagram showing a configuration of a conventional contrast control device for a display for display.

[Explanation of symbols]

1 LCD / display (display for display) 2 LCD / display controller (contrast value storage means, brightness value storage means, first and second control means) 3 CPU (first and second control means) 4 VIDEO / BIOS / ROM (contrast value storing means, brightness value storing means) 5 contrast adjusting means 6 brightness adjusting means 13 temperature measuring means

Claims (3)

[Claims] 1. A contrast adjusting means for adjusting the contrast of the display for displaying, a contrast value storing means for storing an optimum contrast value for each preset display mode of the display for displaying, and a contrast value of the display for displaying. And a control unit for controlling the contrast adjusting unit by setting the optimum contrast value stored in the contrast value storing unit in the contrast adjusting unit when the display mode is switched. apparatus. 2. A brightness adjusting means for adjusting the brightness of the display for display, a brightness value storage means for storing an optimum brightness value for each display mode of the display for display set in advance, and the display for display. 7. The second control means for controlling the brightness adjusting means by setting the optimum brightness value stored in the brightness value storing means in the brightness adjusting means when the display mode is switched. 1. A display contrast control device according to item 1. 3. A temperature measuring unit for measuring an ambient temperature of the display for display, and an optimum contrast value or brightness value set in the contrast adjusting unit or the brightness adjusting unit based on the measured value of the temperature measuring unit is corrected. The contrast control device for a display for display according to claim 1 or 2, further comprising: