JPH03198026A - Liquid crystal display device, back light control system, and information processor - Google Patents

Abstract

PURPOSE:To save a power by lighting only a part required for display by dividing a back light into plural areas, and enabling each divided area to be lit individually and/or luminance control to be applied. CONSTITUTION:The back light 16 is divided into the plural areas, and also, each divided part is provided so as to be lit individually and/or to apply the luminance control individually. The necessity of the display is judged with the display mode of display data, and the control of the back light is performed by performing lights-out or luminance reduction on the divided part of the back light not being used and the divided part equivalent to a part where no display data exists on a screen with a set display mode. Thereby, all required data can be displayed, and the lights-out or reduction of liminance is applied to the back light corresponding to an unrequired display area, which reduces power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device having a backlight, and particularly relates to a backlight control method.

[Prior Art] A small computer such as a laptop type computer equipped with a liquid crystal display device as a display device is small and does not take up much space.
Demand is increasing for reasons such as being lightweight, making it easy to carry, and consuming less electricity. In addition, the liquid crystal display devices used in these computers etc.
Backlit types with clear displays are becoming mainstream.

FIG. 2 is a block diagram showing an example of the main configuration inside a conventional laptop computer.

In the figure, a liquid crystal display device 15 includes a liquid crystal display panel 17 and a backlight 16 that illuminates the liquid crystal display panel 17 from behind. 18 is the backlight 16
This is the power source for lighting.

In addition, 10 is a CPU (central processing unit) such as a microprocessor that controls information processing and system operation.
, 11 is a ROM that stores instructions for the CPU10, and 12 is a RAM that stores data. Reference numeral 13 denotes a display signal generation unit that generates signals necessary for driving the liquid crystal display device 15, and reference numeral 14 denotes a display memory in which data necessary for displaying on the display device 15 is stored.

Further, 4, 5.6 are signals for driving the liquid crystal display device 15, which are display data, frame signal FLM, and clock signal, respectively.

By the way, the display signal generation section 13 shown in FIG. 2 supports many types of display modes depending on the software used. These display modes are broadly divided into two types: vertical 480 dot display and vertical 350 dot display.

FIG. 3(a) shows an example of the display state of the liquid crystal display device 15 in each display mode of 480 vertical dots and FIG. 3(b) 350 dots.

In the figure, 20 is a display portion, and 21 is a non-display portion.

In this way, in order to display 480 dots vertically,
An 80-dot liquid crystal display panel is used.

On the other hand, using this vertical 480 dot liquid crystal display panel,
When in the vertical 350 dot display mode, the display is performed by centering.

[Problems to be Solved by the Invention] In the above conventional technology, when a vertical 350 dot display mode is executed using a vertical 480 dot liquid crystal display panel, non-display areas 21 are generated at the top and bottom, which are unnecessary for display. Even though it is a small portion, it is brightly lit by the backlight 16.

Therefore, there is a problem in that unnecessary power is consumed due to unnecessary lighting of the non-display portion 21.

Further, depending on the usage of the information processing device, only a portion of the screen of the liquid crystal display panel 17, for example, the upper half, may be used. In this case as well, there is a problem in that unnecessary illumination of the display screen is performed, resulting in wasted power consumption.

In particular, when an information processing device is driven using a battery as a power source, reducing power consumption has become a major issue.

An object of the present invention is to provide a liquid crystal display device and a backlight control method that can reduce power consumption by turning off or dimming the backlight of unnecessary parts of the liquid crystal display device. be.

[Means for solving the problem] The above purpose is to divide the liquid crystal display panel into multiple regions and illuminate them with a backlight, and to illuminate each region when there is no display data other than black in that region. This is achieved by turning off or lowering the brightness of the backlight that illuminates that area.

According to the present invention, a liquid crystal display device used for this purpose includes a liquid crystal display panel and a backlight that illuminates the liquid crystal display panel, and the backlight is divided into a plurality of regions, and each divided portion is individually divided. There is provided a liquid crystal display device characterized in that it is provided so as to be capable of blinking and/or brightness control.

[Operation] The backlight according to the present invention is divided into a plurality of regions, and each divided portion can be blinked and/or brightness controlled individually. Therefore, only the parts necessary for display can be lit.

Whether or not it is necessary for display can be determined by the display mode of the display data and by detecting the presence or absence of display data on the screen corresponding to each divided portion.

Depending on the result of this determination, the backlight can be controlled by blinking or changing the brightness for each divided portion of the backlight. In other words, depending on the set display mode, the divided parts of the backlight that are not used for display or the divided parts of the backlight that correspond to the part where there is no display data on the screen are turned off or the brightness is reduced. Control the lights.

This allows all necessary display data to be displayed and backlights corresponding to unnecessary display areas to be turned off or dimmed, significantly reducing backlight power consumption while providing a clear display. It becomes possible.

[Example] Hereinafter, an example of the present invention will be described with reference to one drawing.

Note that the same components and signals will be given the same reference numerals, and redundant explanation will be omitted.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

The embodiment shown in the figure includes an information processing device main body, a liquid crystal display device 15, and a backlight control means 1 for controlling the backlight of the liquid crystal display device 15.

The main body of the information processing apparatus includes a CPU ROM II, a RAM 12, a display signal generation section 13, and a display memory 14, similar to that shown in FIG. 2 described above.

The liquid crystal display device 15 includes a liquid crystal display panel 17, a backlight 16 that illuminates the panel 17 from behind, and a liquid crystal display element drive circuit 80 (a 15th
(see figure).

As shown in FIG. 15, the liquid crystal display panel 17 includes transparent insulating substrates 81 and 85, transparent electrodes 82 and 84 disposed on opposing surfaces thereof, and a liquid crystal disposed between them. layer 83.

The backlight 16 includes transparent electrodes 86 and 90, insulating layers 87 and 89 disposed on opposing surfaces thereof, and a light emitting layer 88 disposed between these insulating layers 87 and 89. It consists of In this embodiment, this backlight 16 is provided by insulating walls 91 and 92.
It is divided into three areas arranged in parallel in the horizontal direction. The transparent electrode 9o is connected as a common electrode to one terminal of the power source 18, and the central part of the three divisions of the transparent electrode 86 is connected directly, and the outer part is connected to the backlight control switch 2.
The configuration is such that it is connected to the other terminal of the power supply 18 via the terminal.

Note that as the light-emitting layer 88, for example, an electroluminescent element can be used. Of course, it is not limited to this.

The liquid crystal display device 15 of this embodiment uses a liquid crystal display panel 17 with 480 vertical dots in order to realize a 480 vertical dot display. As a result, the display signal generating section 13 can be set to any of the two modes, 480 vertical dot display mode and 350 vertical dot display mode.

In the case of vertical 350 dot display mode, centering is performed and the central display part 2 is
0 and the non-display portions 21° 21 above and below it, one screen is divided into three parts. Therefore.

The above-mentioned backlight 16 is divided into three parts as shown in FIG.
It is preferable to carry out the process corresponding to the three divisions shown in ).

Note that FIG. 3(a) is an example of a display screen in the vertical 480-dot display mode, and only the display portion 2o is displayed.

The backlight control means 1 includes a pack light control switch 2 that turns on and off the power supply to the upper and lower regions of the backlight 16 divided into three parts, and controls their blinking;
The backlight control register 3 stores a command for determining whether the backlight control switch 2 is turned on or off.

The backlight control switch 2 can be configured with a semiconductor switch, for example.

The backlight control register 3 can be of the following two types.

The first method is to provide a register at a new address.

Normally, switching between the two types of display modes described above is carried out by, for example, B
IOS (Basic Input 0output
This is done by calling the system. BIO
8 analyzes the parameters at the time of calling and initializes the display system registers and memory related to the corresponding display mode, so the user does not need to be aware of the set values of the registers.

Therefore, by adding a program to the BIOS to set the register 3 in correspondence with each display mode,
The user can control the backlight without being aware of it.

(Left below) The second method utilizes existing registers related to the settings of the vertical 480-dot display mode and the vertical 350-dot display mode.

As such a register, there is a register indicating the number of vertical display lines. CPU10 stores vertical 35 in this register.
In case of 0 dot display mode.

349 and in vertical 480 dot display mode,
Set 479. For example, CPU10.

A register is provided which becomes 1'1'' when 349 is set in this register, and 110'1 when other values are set, and this is used as the backlight control register 3.

According to this second method, the backlight control register can utilize an already used address instead of a new address. Furthermore, in this case, there is no need to change BIO8.

Next, the operation of this embodiment will be explained.

Prior to execution of the application, CPUl0
According to O8, the display mode setting for the application program to be executed is performed, that is, the CPU
First, l0 sets the backlight control register 3 corresponding to the 1 display mode. With this setting, the backlight control switch 2 is set to be turned off in the vertical 350 dot display mode and turned on in the vertical 480 dot display mode.

In this embodiment, the central region of the backlight divided into three parts is always connected to the power source 18, and the upper and lower regions are turned on and off by the switch 2.

As a result, in the vertical 480 dot display mode, the entire area of the backlight 16 divided into three parts is illuminated. On the other hand, vertical 3
In the 50-dot display mode, only the central region of the backlight 16 is lit. In addition, in the vertical 350 dot mode, the backlight off part corresponds to the non-display part 22, so all necessary information can be displayed, and only the top and bottom parts of the backlight are turned off, reducing power consumption accordingly. This gives rise to the advantage of

Display on the liquid crystal display device 15 with the backlight 16 turned on in accordance with the display mode is performed as follows.

First, data is read from the display memory 14, and this is
The display signal generator 13 generates display data, and the display data 4 is generated together with the frame signal 5 and the clock signal 6.
The signal is then sent to the instant-action circuit 80 for the liquid crystal display element. and,
'The liquid crystal display panel 1 is
At 7, display data is displayed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 8.

The second embodiment shown in FIG. 5 includes the same information processing device main body as the first embodiment, a liquid crystal display device 15, and a backlight control means 31.

The liquid crystal display device 15 of this embodiment has one side of the liquid crystal display panel.
Corresponding to the line, ■It is divided and configured for each line.

That is, although the backlight 16 shown in FIG. 15 described above is divided into three parts, the backlight 16 of this embodiment has a configuration further divided into three parts.

Here, the width of one horizontal line is set in units of several vertical pixels. However, one horizontal line is not limited to this, and even if the width is smaller than this (for example, one pixel),
It may also have a large width.

In this embodiment, the backlights 16 are A and B.

It is divided into a plurality of lines like C1..., and these lines are respectively backlight control switches 33a and 33b of a backlight control means 31, which will be described later.

33c, . . . By turning these switches 33a, 33b, 33c, . . . on and off, they are connected to the power source 18 and driven to emit light.

The backlight control means 31 performs dynamic blinking control on the backlight 16 subdivided into lines. The backlight control means 31 includes a display data detection means 32 for detecting the presence or absence of data other than black (i.e., display data) for each line of the display data 4 sent from the display signal generation section 13; Detection means 32
Backlight control switches 33a, 33b, and 33c are turned on and off and control the blinking of the 1st line, 2nd line, and 3rd line of the backlight, respectively.

It is composed of...

In addition, in the figure, 35 is a signal DISP indicating the valid period of display data. Also, 34a.

34b, 34c, . . . are signals ONA, ONB, OBC, .

FIG. 7 shows an example of a detailed circuit configuration of the display data detection means 32.

In FIG. 7, the display data detecting means 32 receives display data DA, DB in 4 bits each.

An OR circuit 301 that performs a logical sum on DC and DD, and signals Sl and S that sequentially activate each display line.
2. . . from the frame signal 5 and the DISP signal 35, and a circuit portion 310 that generates the signals SL, S2 .・
. . . and a switch control section 320 that controls on/off of the backlight control switches 33a, 33b, 33c, . . . using the output of the gate circuit 301.

The circuit portion 310 that generates the signal 81 etc. includes a set of two D flip-flop circuits 311 and 31 corresponding to each line.
2, inverters 313 and 314, an OR circuit 315, and a plurality of AND circuits 316 corresponding to each line.

The switch control unit 320 includes a plurality of NAND circuits 321 that performs a logical AND operation on the output data 40 of the OR circuit 301 and the output of the AND circuit 316 for each line;
A plurality of sets of two NAND circuits 322 and 323 constitute a flip-flop circuit set by the output of each NAND circuit 321 and detect the presence of display data other than black on the corresponding line, and each of the above-mentioned A plurality of inverters 324 are provided corresponding to the AND circuit 316 and invert the output thereof, and the output of the inverter 324 is used as a clock signal to latch the output of the NAND circuit 322, and the backlight control switches 33a, 33 b
, 33c, - signals 34a, 34b,
A D flip-flop circuit 32 that outputs...
5.

Next, the operation of this embodiment will be explained with reference to the display state example shown in FIG. 6 and the time chart shown in FIG. 8.

In the liquid crystal display device 15, the backlight 16 is dynamically controlled to blink by the backlight control means 31, and is turned on when there is data other than black in the display data 4 in any horizontal line, and turned off when there is no data other than black. do. As a result, as shown in FIG. 6, a non-lit portion 36 and a lit portion 37 of the backlight 16 are generated.

Next, the backlight control means 31 outputs ON A 34 a from the display data detection means 32.

Backlight control switches 33a, 33 corresponding to the respective horizontal lines are controlled by 0NB34b, 0NC34c, etc.
b, 33c, . . . on/off control.

In the lines that are ON, the backlight 16 is connected to the backlight power source 18 and turned on, and on the other lines, the backlight 16 is disconnected and turned off.

Next, the operation of the display data detection means 32 will be explained in more detail.

The OR circuit 301 performs a logical sum on the signals DA, DB, DC, and DD of each bit of the 4-bit display data 4. When the output data DATA4 is at "H" level, the display data 4 includes data other than black, and when it is "it L", it indicates that the display data 4 is all black.

In the circuit portion 310 that generates the signal 81 and the like, each flip-flop circuit 311 and 312 is reset by the FLM signal 5, which is a frame synchronization signal. And D
a signal Sl that sequentially activates the display lines such as the first line and the second line based on the ISP signal 35;
S2. ... is generated.

In the switch control unit 320, the NAND circuit 321 is
The above signal 81. S2. ... are respectively II H11
In the display line where , display data 4 is 'H
”, display data 4 includes data other than black, so when it becomes 'H', the corresponding 5ETI,
5ET2. . . . make each signal active.

Each of the plural sets of NAND circuits 322 and 323 outputs Ql, Q2 . The corresponding one becomes 11 HII and becomes set state. As a result, the presence of data other than black, that is, data to be illuminated by the backlight 16, is detected in the corresponding display line. Note that each NAND circuit 322 and 3
23 is reset by FLM signal 5.

The outputs Ql, Q2 . ···teeth,
Signals SL, S2. D whose clock is the inverted signal of ...
It is latched into flip-flop 325.

Backlight control signals ○NA34a and 0NB34b are output from each D flip-flop 325.

Each signal of Ql, Q2 . ... is a signal latched at the end of each line, and remains active until it is detected that there is no display data other than black in the line in frame units after the end of the line.

These backlight control signals ON A 34 a.

The ON/OFF control of the backlight control switches 33a, 33b, . . . is performed by the 0NB34b, .

As a result, each line of the backlight 16 is connected or disconnected to the power source 18 according to the on/off state of the corresponding switch 33a, 33b, . . . , and is turned on or off.

As described above, the backlight corresponding to the non-display line can be dynamically turned off, allowing all necessary information to be displayed and reducing power consumption.

Next, a third embodiment of the present invention will be described with reference to FIG. 9.

This embodiment includes an information processing device main body similar to those of the above-described embodiments, a liquid crystal display device 15 that can blink the backlight 16 in units of characters, and blinking control of each part of the backlight 16 of the liquid crystal display device 15. Backlight control means 31
It is composed of:

The liquid crystal display means 15 uses a backlight 16 whose light emitting parts are divided into a matrix so that each character displayed on the liquid crystal display panel 17 can be blinked. The size of the divided portions may be adjusted to match the minimum unit character, and for larger characters, adjacent divided portions may be blinked together.

The backlight 16 of this embodiment is provided with a plurality of X-direction electrodes and a plurality of Y-direction electrodes corresponding to each part divided into a matrix, and one of the opposing electrodes sandwiching the light-emitting layer is connected to the X-direction electrode. , and the other as the Y direction electrode. When the voltage of the power supply 18 is applied between both electrodes in the X direction and the Y direction,
The portion of the light emitting layer where these intersect each other emits light.

The backlight control means 31 has a character code 100. Attribute 101 indicating attributes such as character color, character clock 102 and DISP
Based on the signal 35, signals 111a and 1l detect the presence or absence of a display other than black for each character and control energization to each X-direction electrode and each Y-direction electrode of the backlight 16.
lb.

. . . , and 112a, 112b, . . . , a display data detection means 110 that outputs the signals 112a, 112b, .

115b, -- and 116a, 116b
, - backlight control switch 113 that turns on and off
a.

113b, ... and 114a, 114b
, -.

The display data detection means 110 of this embodiment is the fifth one described above.
In place of the display data 4 in the figure, a character clock 102, a character code 100 and an attribute 10
1, the presence or absence of a display other than black is detected for each character. According to this detection result, display data detection means 1
10, backlight control signals 111a, 11lb, .
and outputs 112a, 112b, -.

In response to this, each backlight control switch 113 a
, 113b, - and 114a, 114b.

... are turned on and off, and the power supply 18 is connected to the X-direction electrode and Y-direction electrode that intersect at the divided portion where illumination is required, respectively.

FIG. 11 schematically shows an example of the display state of a liquid crystal display device whose display state is controlled by the method of this embodiment.

In the figure, a portion 71 with characters is a backlight 1
6 and are individually illuminated with high brightness.

On the other hand, in the shaded areas 72 in the same figure where there are no characters, the backlight 16 is
Lights out, unlit.

Therefore, in this embodiment, each time a character is input and displayed, that part is individually illuminated by the backlight 16, so only the necessary part is illuminated and the other parts are turned off. , lower power consumption can be achieved. Also, on the screen,
Since only the portion where information is displayed is of high brightness, the relative contrast of the entire screen is improved.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 10.

This embodiment includes an information processing device main body similar to those of the above-described embodiments, a liquid crystal display device 115 that can blink the backlight 16 in units of rows, and a blinking control for each row of the backlight 16 of the liquid crystal display device 15. backlight control means 3
1.

The liquid crystal display device 15 is capable of blinking characters displayed on the liquid crystal display panel 17 line by line.

A backlight 16 whose light emitting portion is divided is used.

Adjust the size of the divided part to match the height of the minimum unit character.
For larger characters, adjacent divided parts may be blinked together.

The backlight 16 of this embodiment is constructed almost the same as that shown in FIG. 15 described above, and the transparent electrode 8
6 is provided in each row as a row direction electrode.

The backlight control means 31 includes a character code 100 indicating the type of character to be displayed, an attribute 101 indicating attributes such as character color, a character clock 102, and a DISP.
Display data detection means 109 detects the presence or absence of a display other than black for each row based on the signal 35, and outputs signals 103a, 103b, . . . for controlling energization of the row electrodes of the backlight 16; Backlight control switches 104a and 104b control on/off of each row direction electrode.

It is composed of...

The display data detection means 109 of this embodiment is the fifth
In place of display data 40 in the figure, character clock 1021 character code 100 and attribute 10
1, the presence or absence of display other than black is detected for each line. According to this detection result, display data detection means 109
outputs backlight control signals 103 a , 103 b , . . . to control energization of the row direction electrodes.

In response to this, each backlight control switch 104a
, 104 b, - turns on and off, and turns on the power supply 18,
Each is connected to the row direction electrode of the divided portion that requires illumination.

FIG. 12 schematically shows an example of the display state of a liquid crystal display device whose display state is controlled by the method of this embodiment.

In the same figure, a line portion 73 containing characters is illuminated line by line by the backlight 16 and has high brightness. On the other hand, the backlight 16 is turned off and is not illuminated in row portions 74 without a single character, which are indicated by diagonal lines in the figure.

Therefore, in this embodiment, the rows in which characters are input and displayed are individually illuminated by the backlight 16, so that only the necessary portions are illuminated and the other portions are turned off. Power consumption can be reduced.

Next, still another embodiment of the present invention will be described with reference to FIGS. 13 and 14.

The embodiment shown in FIG. 13 is a modification of the embodiment shown in FIG. 10 above.

In this embodiment, the presence or absence of characters to be displayed in the embodiment shown in FIG. It is modified to blink.

In this embodiment, the presence or absence of data other than black in the display data is detected for each character column, and based on this detection result, the illumination of the corresponding column of backlight is blinked.
Since the illumination is turned off for columns where no characters are displayed, power consumption can be reduced.

The embodiment shown in FIG. 14 is an example in which the backlight control of the present invention is applied to improve the visibility of the display.

Currently, as display devices become larger, development is progressing in two directions: increasing the density of information display and improving the visibility of information display. In order to improve the visibility of the latter information display, there is a method of widening the character spacing.

In this embodiment, in order to widen the space between characters on the display screen, a portion 77 where characters are displayed corresponds to a non-display portion 78 where no characters are always displayed.

The backlight is divided and only the portion corresponding to the display portion 77 is lit.

As a result, the portions necessary for character display (display lines) are reliably illuminated, and the portions unnecessary for displaying one character (line spacing) are turned off, making it easier to see the displayed character information. Furthermore, power consumption for the unlit portion is reduced.

Although this embodiment shows an example in which the light is turned off between rows, the light may be turned off between one column or between one character as well as between rows or columns.

By the way, in each of the above embodiments. In the backlight control method, only an example of blinking is shown, but instead of turning off the light, a configuration may be adopted in which the brightness is lowered.

In this case, it may be possible to selectively turn off the light and reduce the brightness, or when increasing the brightness of one screen, the brightness may be increased only for the portion necessary for display. Either case is effective in reducing power consumption.

Furthermore, the present invention is not limited to liquid crystal display devices, but can be widely applied to devices that perform illumination using a backlight for display.

Furthermore, in an information processing device that may be driven by a battery, the present invention reduces the display character size to display in a narrow range of the screen when the battery is turned on, and turns off or turns off the backlight of unused portions. It can be configured to lower the brightness.

Furthermore, in each of the embodiments described above, each part of the backlight may be turned on and off by manual operation.

[Effects of the Invention] According to the present invention, by turning off or dimming the backlight of unnecessary parts of the liquid crystal display device, it is possible to display all necessary information and reduce power consumption.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of a first embodiment of the present invention, FIG. 2 is a block diagram showing an example of the internal structure of a conventional laptop-type information processing device, and FIG. 3 is a block diagram showing an example of the internal structure of a conventional laptop-type information processing device. FIG. 4 is an explanatory diagram schematically showing the display state of the liquid crystal display device according to the embodiment shown in FIG. FIG. 6 is an explanatory diagram schematically showing the display state of the liquid crystal display device according to the second embodiment, FIG. 7 is a logic circuit diagram showing an example of display data detection means, and FIG. 8 is a block diagram showing the configuration. Time chart showing the operation of the display data detection means shown in FIG. 7, No. 9
The figure is a block diagram showing the configuration of a third embodiment of the invention, FIG. 10 is a block diagram showing the configuration of a fourth embodiment of the invention, and FIG. 11 is a liquid crystal display in the embodiment shown in FIG. FIG. 12 is an explanatory diagram schematically showing the display state of the device, FIG. 12 is an explanatory diagram schematically showing the display state of the liquid crystal display device in the embodiment shown in FIG. 10, and FIGS. An explanatory diagram schematically showing an example of a display state of a liquid crystal display device in another embodiment, and FIG. 15 is a cross-sectional view showing the structure of a liquid crystal display device in which a backlight is divided into three parts. DESCRIPTION OF SYMBOLS 1... Backlight control means, 2... Backlight control switch, 3... Backlight control register. 10... CPU, 11... ROM,
12...RAM. 13...Display signal generation section, 14...Display memory, 1
5...Liquid crystal display device, 16...Backlight, 17
...Liquid crystal display panel, 18...Power source, 31...Backlight control means, 32...Display data detection means,
33a. 33b, 33c,... Backlight control switch. 109, 110...Display data detection means. 104at 104b, 104c, ”・113a
. 113b, ---, 114a, 114b, ----
Backlight control switch, 81.85...Transparent insulating substrate, 82.84...Transparent electrode, 86.90...
Transparent electrode, 87.89... Insulating layer, 88... Light emitting layer. Figure 3 (a) (b) Figure 4 (a) (b)

Claims (1)

[Claims] 1. A liquid crystal display panel and a backlight illuminating the panel, the backlight being divided into a plurality of regions,
A liquid crystal display device characterized in that each divided portion is provided so that blinking and/or brightness can be controlled individually. 2. The liquid crystal display panel is divided into multiple regions and illuminated with a backlight, and each region is illuminated by turning off or turning off the backlight illuminating that region when there is no display data other than black in that region. A backlight control method characterized by lower brightness. 3. An information processing device main body that processes data and outputs display data, and a liquid crystal display device that performs display using a backlight, the backlight being divided into a plurality of regions,
Each divided portion is provided to be capable of blinking and/or brightness control individually, and the backlight control means detects the presence or absence of display data in a display area corresponding to each divided portion of the backlight and takes appropriate action. An information processing device characterized by having a function of controlling blinking or brightness of divided parts. 4. An information processing device main body that processes data and outputs display data, and a liquid crystal display device that performs display using a backlight, the backlight being divided into a plurality of regions,
Each part is provided so as to be able to blink and/or control the brightness individually, and the backlight control means is configured to turn off or turn off divided parts of the backlight that are not used for display, depending on the display mode of the data to be displayed. An information processing device characterized by having a function of reducing brightness.