JPH046593A - Driving method and multiple gradation control method of liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain brightness characteristics matching human visual sense characteristics similarly for any color by providing a liquid crystal driving means which inputs the multi-gradation (multi-color) display data of an input interface signal and a display synchronizing signal and converts them into the driving signal of the liquid crystal display device to make a display. CONSTITUTION:An eight-level liquid crystal driving signal generating means 101 which inputs the Red(R) signal 100, Green(G) signal 101, and Blue(B) signal 102 of the display data of the interface signal generates liquid crystal display data 107 and the liquid crystal display device driving signal. In an X driving means 115, a data shift means 800 inputs liquid crystal display data 107 by one line with a data shift clock 111 and generates a shift data output 800. Further, a one-line latch means 802 latches the shift data 801 with a horizontal clock 110 and outputs display data 803. Further, an eight-level voltage selecting means 804 selects an eight-level liquid crystal impressed voltage. Consequently, a multi-gradation (multi-color) display which is free from flickering is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multicolor display system, and more particularly, to a multicolor display system using a color liquid crystal panel or the like.

[Conventional technology]

A conventional liquid crystal display device converts an input interface signal into a driving signal for driving a liquid crystal display family, and applies the driving signal to a liquid crystal display means such as Hitachi $1HD66107T. Images are displayed by capturing two levels of display data of the signals for one line in the vertical direction of the screen and outputting it to the liquid crystal panel as a liquid crystal drive power source. However, in such conventional liquid crystal display devices, display on and display off are expressed using two levels of liquid crystal driving power supply, and multicolor display is not considered.

A conventional liquid crystal display device is illustrated below using FIGS. 2 to 7.
I'll explain it to you.

FIG. 2 is a block diagram showing a conventional liquid crystal display device.

In FIG. 2, 200 is the Red signal of the display data of the input interface signal, and 2O1 is the area
n signal, 202 is a Blue signal. Each of these display data is 1-bit data. 103 is a water turbine synchronization signal among the synchronization signals of the input interface signals;
104 is a vertical synchronizing signal, and 105 is a dot clock synchronized with display data.

203 is a two-level liquid crystal drive signal generating means, which generates liquid crystal display data 204 and a liquid crystal drive signal. 1
08 is a line start clock, and 109 is a vertical shift clock. 110 is a horizontal clock, 1
11 is a data shift clock. 205 is a liquid crystal AC clock. 113 is a Y (axial direction) drive means.

114 is a Y drive signal.

206 is an X (axial direction) driving means, and 207 is one line data. 208 is a display off power supply on the positive side of the liquid crystal drive power supply; 209 is a positive on power supply; 21
0 is a minus side on power supply, 211 is a minus side off power supply, and is generated by the power supply circuit -212. 122 is a liquid crystal panel.

FIG. 3 is a block diagram showing details of the X drive means 206 in FIG. 2.

In FIG. 3, 300 indicates the liquid crystal display data 204,
Data shift means 301 takes in one line by data shift clock 111, and shift data 301 is the output of data shift means 300. 302 latches the shift data 301 using the horizontal clock 110. 1 line latch means, and 303 is display data that is the output of the 1 line latch means 302.

304 is display data 303 and liquid crystal alternating clock 112
From this, the liquid crystal drive power supply is given as display data for the liquid crystal,
This is a two-level liquid crystal voltage selection means.

X-Di to X-Dm are 1-line data 207 that are data lines for 1 line when the number of horizontal display pixels on the liquid crystal display screen is m pixels.

FIG. 4 shows the X drive means 206 and Yt! in FIG. This relates to the operation when the driving means 113 drives the liquid crystal panel 122. It is a timing diagram of each signal.

In FIG. 4, (a) is a horizontal clock 110,
This is a clock that is generated in synchronization with each horizontal scanning period on the display screen. 3(b) is a data shift clock 111, which has a much higher repetition frequency than the horizontal clock 110, and is a data shift clock 111 of the data shift means 3 in FIG.
It is used to shift the liquid crystal display data 204 taken into 00 within the data shift means 300. (C
) is a timing diagram showing the liquid crystal display data 211,
It is synchronized with the data shift clock 111.

(d) is the horizontal clock 110 like (,), but
Keep the time scale small. (e) shows that the first line, second line, third line, etc. of X-D1 to X-Dn of the one-line data 207 are synchronized with the horizontal clock 110. (f), (g), and (h) are each YIlli! Ys output by the moving means 113
There is a dynamic multiplier signal 114.

That is, (f) is display line data Y-Di that indicates that the first line should be displayed, and (g) is display line data Y-D2 that indicates that the second line should be displayed.

FIG. 5 shows the operation of the liquid crystal alternating current clock 205. (a) is the line start clock 108, 1
This is a clock that occurs every frame. (b) is the fourth
This is the same horizontal clock 110 as in Figures (a) and (d). (
C) is the same line start clock 108 as in (a), but with a smaller time scale. (d) is a liquid crystal alternating current clock 205, which is a clock that is inverted every frame.

Figure 6 shows the cases when the display is on and the display is off.

This is an application waveform of liquid crystal driving power applied to one liquid crystal pixel. From FIG. 5, since the liquid crystal alternating clock 2o5 is inverted every frame, the liquid crystal alternating clock for one liquid crystal pixel is (a). (b) shows a display off level 208 on the plus side with respect to the GND level (d) of the liquid crystal drive power supply, (f) shows a display off level 211 on the minus side, and (c) shows a display on level 209 on the plus side.
(e) is the display on level 210 on the negative side.

FIG. 7 shows the pixel configuration of the liquid crystal panel 122.

700 is an R pixel, 701 is a 0 pixel, and 702 is an 8 pixel.
One dot 603 is composed of three pixels.

Hereinafter, in order to explain the operation, FIG. 2 will be referred to again.

In FIG. 2, two-level liquid crystal drive signal generation means 203
is from the input interface signal.

Line start clock 108, which is a drive signal for liquid crystal;
Vertical shift clock 109. Generates a horizontal clock 110 and a data shift clock 111.

Liquid crystal display data 204 synchronized with the data shift clock 111 is generated.

The X driving means 206 includes liquid crystal display data 204, data shift clock 111. A horizontal clock 110 is applied, and a vertical shift clock 109 is applied to the Y driving means 113.
and the line start clock 108 are applied, and the liquid crystal display data 204 is displayed on the liquid crystal panel 122.

XS moving means 206. The operation of the Ylii motion means 113.

This will be explained below using FIGS. 3, 4, 5, and 6.

In FIG. 3, the data shift means 300 takes in data for one line during one horizontal period in accordance with the data shift clock 111 after outputting the first horizontal clock 110 if it is the first, as seen in the fourth section. Shift data 3
Output as 01.

This shift data 301 is latched by the 1-line latch means 302 with the horizontal clock 110, and the display data 303
becomes. In the two-level liquid crystal voltage selection means 304, this display data 303 and the liquid crystal drive power supply AC clock 2
05, the liquid crystal drive power supply is set to 1 line data 207 (
X-Di to X-Dm). That is, the X driving means 206 converts the data one line before the line of liquid crystal display data 204 currently taken into the data shift means 300 into the liquid crystal panel 122 as one line data 207 via the two-level liquid crystal voltage selection means 304. Output to.

The operation of the two-level liquid crystal voltage selection means 304 of the X driving means 206 in FIG. 3 will be explained using FIG. 6.

In FIG. 6, when the liquid crystal drive AC clock 205 is "high", the power level is on the positive side as seen from the GND level (d) (when the display is off (b)).

When the display is on, (C)) is selected, and when the display is 40-'', the negative power level ((f) when the display is off, (e) when the display is on) is selected, and the LCD drive power supply is changed to AC. Therefore, one line data 207 is outputted as a liquid crystal driving power source converted to AC for each frame.
As shown in the timing diagrams (f), (g), and (h) in the figure,
The above 1 line data 2 is added to the line that is ``high''.
07 is displayed on the liquid crystal panel 122.

Further, the Y driving means 113 shown in the second @ takes in the line start clock 108 with the vertical shift clock 109, thereby driving the first line Y-Dl of the liquid crystal panel 122.
is set to "high", and thereafter, every time the vertical shift clock 110 is input, the Y-D of the second line and the Y-D of the third line are set to "high".
3. Shift "U high" in the order of... Therefore,
As shown in FIG. 4, when the X@ driving means 2051 is outputting the 1st line data 201, Y-Di of the display line data 114 of the Yf driving means 113 is set to "high" and When the driving means 205 is outputting the first line data 213 of the second line, the YM driving means 11
Of the 3 display line data.

When Y-D2 is set to "high" and one line data 213 to each pixel is "high", the display is turned on.'
The display turns off when it is set to “low”.

The operation of color display will be explained using FIG. 7.

One line data 207 in FIG. 2 corresponds to the R pixel 70 in FIG.
0. GIf*701, B pixel 702 (7) One dot 603 is supplied by a combination of display on and display off.

Therefore, when one line of a liquid crystal display has 640 dots, the number of horizontal pixels m is three times 640 dots, so
m=1920, and one line data 207 in FIG. 3 becomes X-Dl to X-D1920. This one dot 60
Characters and figures are displayed in 8 colors by the 8 combinations in 3.

[Problem to be solved by the invention]

In the above conventional example, the display data is a 1-bit digital signal for each display color, and is 'high', n-low, display on,
The display can be turned off, and each display color can be multi-bit multi-bit.
Multi-gradation (multi-color) display using l (multi-color) display data was not considered.

Furthermore, when using an X drive means that can select n levels of liquid crystal applied voltage, no consideration was given to a multilevel jl (multicolor) control method for obtaining 2n levels of display color for each display color.

An object of the present invention is to realize a method for driving a liquid crystal display device using an X driving means that can select n-level liquid crystal applied voltages,
Multi-level display that allows flicker-free multi-gradation (multi-color) display with 2n levels for each display color! 1 (multicolor) control method.

[Means to solve the problem]

In order to achieve the above object, in the present invention.

A means is provided for converting 2n level multi-gradation (multicolor) display data of the input interface signal into liquid crystal display data weighted at n levels in the first frame and the second frame. .

Furthermore, when the display color of the input interface signal is color, the conversion means is configured so that each display color data is weighted differently.

Furthermore, for a display color with a low luminance level, the conversion means is configured such that the n-level liquid crystal display data obtained in the weighting process is different between the first frame drive and the second frame drive, and The display color with the highest brightness level is the first one. Second which frame iI! The converting means is configured so that the n-level liquid crystal display data obtained even during working hours is the same.

Furthermore, the conversion means is configured so that liquid crystal display data of the same level is not supplied to adjacent display pixels.

Further, an alternating means is provided for alternating the voltage applied to the liquid crystal alternately in two frames and alternately in vertical lines.

[Effect]

The means for converting multi-gradation II (multi-color) display data into weighted liquid crystal display data is configured to convert multi-gradation II (multicolor) display data into weighted liquid crystal display data when multi-gradation display data at a voltage selection level or higher of the X drive means is input. Multi-gradation display will be possible.

Furthermore, when the display color is color, the weighting of the conversion means is configured to be different from Red.

The brightness characteristics of Green and Blue displays become uniform.

Furthermore, by obtaining liquid crystal display data with a low brightness level through the weighting process, brightness characteristics matching human visual characteristics can be obtained.

Furthermore, by changing the alternating current method of voltage applied to the liquid crystal, a direct current component is not applied to the liquid crystal.

〔Example〕

FIG. 1 shows an embodiment of a circuit that implements the method for driving a liquid crystal display device of the present invention.

100 is Re of the display data of the interface signal.
d (hereinafter also referred to as R) signal, and 101 is Gr
een (hereinafter also referred to as G) signal.

Reference numeral 102 denotes a Blue (hereinafter also referred to as B) signal, each of which is input with 4 bits.

106 is an 8-level liquid crystal drive signal generating means;
7 LCD display data and LCD display bag! Generate drive signals. 112 is a liquid crystal AC clock.

115 is X (axial direction)! ! ! 116 is one line data.

117 is a power supply circuit, 118 is an 8-level liquid crystal drive power source on the positive side, and 119 is an 8-level liquid crystal drive power source on the negative side. 120 is a voltage selector;
121 is an X driving means supply power source. 122 is a liquid crystal panel.

FIG. 8 shows a circuit for realizing the method for driving a liquid crystal display device according to the first aspect, and is a block diagram of the X@ moving means 115 in FIG.

In FIG. 8, 800 is a data shift means that takes in one line of liquid crystal display data 107 using a data shift clock 111, and 801 is shift data that is the output of the data shift means 800.

802 is a one-line latch means that latches the shift data 801 using the horizontal clock 110, and 803 is display data that is the output of the one-line latch means.

804 is an 8-level voltage selection means for selecting 8 levels of voltage applied to the liquid crystal.

FIG. 9 shows operational waveforms for driving the liquid crystal of this embodiment.

In the 91i1, (, ), (d) are the horizontal clock 1
07. (b) is the data shift clock 106. (
C) is display data 107 for liquid crystal.

(e), (f), and (g) are one line data 116.

FIG. 10 is a circuit for realizing the multi-gradation control method for a liquid crystal display device according to claims 2 to 5, and is a block diagram of the liquid crystal drive signal generating means 106 of FIG. 1.

1000 is a first decoder that weights the Red signal 100 of one display data, and 1001 is first decoded data. 1002 is a red signal 100
1003 is a second decoder that weights
This is second decoded data. A selector 1004 selects the first decoded data 1001 and the second decoded data 1003 and outputs the liquid crystal display data 1005.

A first decoder 1006 weights the green signal 101 of the display data.

1007 is first decoded data. 1008 is a second decoder that weights the Green signal 101, and 1009 is second decoded data.

A selector 1010 selects the first decoded data 1007 and the second decoded data 1009 to output the liquid crystal display data 1011.

1012 is a first decoder that weights the Blue signal 102 in one display data, and 1013 is a first
This is the decoded data. 1014 is the Blue signal 1
A second decoder that performs weighting of 02 and 1015
is the second decoded data. 1016 is the first decoded data 1013 and the second decoded data 101
This is a selector that selects 5 and outputs 1017 liquid crystal display data.

A flip-flop 1018 generates a frequency-divided signal 1019 of the horizontal synchronizing signal 103. A flip-flop 1019 generates a frequency-divided signal 1020 of the vertical synchronization signal 104. A flip-flop 1022 generates a frequency-divided signal 1023 of the dot clock 105.

Each branch signal 1019.1021.1023 is supplied to selectors 1oO4, 1010, and 1016.

FIG. 11 shows the weighting control of the liquid crystal display data 1005 by the decoding control of the Red signal 100 system decoders 1000 and 1002 of the liquid crystal drive signal generation means 106 of FIG.

The 12th [is the 10rj4 liquid crystal drive signal generating means 10
6 Green signal 101 series decoder", 006 and 1o
This figure shows weighting control of liquid crystal display data 1011 by decoding control of O8.

FIG. 13 shows the weighting control of the liquid crystal display data 1017 by the decoding control of the Blue signal 102 system decoders 1012 and 1014 of the liquid crystal drive signal generation means 106 of FIG.

FIG. 14 is a graph showing the luminance characteristics of 16 gradations for each of RlG and B in this example. The horizontal axis 1400 is the gradation number of 16 gradations, which is shown in Figs.
This matches the values of the R, G, and B input display data shown in FIG. The vertical axis 1401 is luminance, and the unit is cd/rd. 1402 is the brightness of G, 1403 is the brightness of R, 140
4 is the brightness of B.

FIG. 15 shows an embodiment of a circuit that implements the method for driving a liquid crystal display device according to claims 6 and 7.

1500 uses a flip-flop to generate a 2-divided signal 1501 of the vertical synchronizing signal 104; 1502 uses a flip-flop to generate a 4-divided signal 1503 of the vertical sync signal 104; A signal 1505 is generated.

A vertical line counter 1506 counts the number of lines in the vertical direction and generates count data 1507. 1508 is the least significant bit of the count data 1507. At the EOR gate 1509, the liquid crystal AC conversion signal 151o is generated in line units from the frame unit liquid crystal AC conversion signal 1505 and the least significant bit 1508 of the count data.
is generated. 1511 is a selector; 1512
is a selected liquid crystal alternating current signal, and 1513 is a flip-flop for synchronization.

16 and 17 show waveforms of the liquid crystal alternating current clock in this embodiment.

In FIG. 16, (a) and (c) are the line start clock 10g, and (b) is the horizontal clock 110. (
d) is the liquid crystal drive AC clock 112, which is inverted every two frames.

In Figure 17, (,) is line start clock 1
08, (b) is the horizontal clock 110, and 7 (c) is the liquid crystal drive AC clock 112, which is inverted every line.

In order to explain the operation of one embodiment of the circuit that implements the method for driving a liquid crystal display device according to the first aspect, reference will be made to FIG.

In FIG. 1, the liquid crystal drive signal generation means 106 generates a horizontal synchronization signal 103. which is a synchronization signal of an interface signal.
Vertical synchronization signal 104. A liquid crystal driving signal is generated from the dot clock 105 in the same manner as in the conventional method, and a Red signal 100. Gre
From the en signal 101 and the blue signal 102, liquid crystal display data 107 of 3 bits for each color, which is the information width of each pixel of the xs moving means 105, is generated. Note that the Red signal 100. A method for generating 3-bit liquid crystal display data from the Green signal 101 and Blue signal 102 will be described in detail later.

At the power supply port jll17, a positive 8-level liquid crystal drive power supply 118. LCD drive power supply 11 with 8 levels on the negative side
9 is output, and the
is supplied to the xm moving means 115. By applying positive and negative drive voltages to the liquid crystal pixels, deterioration of the liquid crystal is prevented.

The X @ driving means 115 includes a horizontal clock 110, a data shift clock 111, as well as an X driving means supply power source 121.
．． Then, liquid crystal display data 107 is given. The line start clock 108 and the vertical shift clock 109 are applied to the Y@ moving means 113 as in the conventional case, and the liquid crystal display data 107 is displayed on the liquid crystal panel 122.

In FIG. 8, the 3-bit liquid crystal display data 107 for each color generated by the liquid crystal drive signal generation means 106 shown in FIG. 3 bits of display data for each color is output as 8°3. The 8-level voltage selection means 804 selects 3-bit display data 8 from among the input 8-level X drive means supply power 121.
03 is selected, and the liquid crystal panel 12
2, one line data 116 is output.

Therefore, each data line X−D1 of one line data 116=
X-Dm has 8 levels of liquid crystal drive voltage on the positive side,
There are eight levels of liquid crystal driving voltage on the negative side. Using this difference in the amplitude of the applied voltage, multi-level X (multi-color) display colors are obtained.

In FIG. 9, (e)X of one line data 116
-Di is the liquid crystal driving power supply when the first data value of the liquid crystal display data 107 is 7', the liquid crystal driving power supply, (f)X-
D2 indicates that the second data value of the liquid crystal display data 107 is 5.
It shows that the liquid crystal drive power supply at the time of ' is given as liquid crystal display data.

The operation of the circuit for realizing the multi-gradation method for a liquid crystal display device according to claims 2 to 5 will be described below with reference to FIGS. 9 to 13.

In FIG. 9, the 4-bit Re of the interface signal
The d signal is sent to the first decoder 900, which performs weighting, and the second decoder 900, which performs weighting.
The decoder 902 outputs 3-bit data 901, 9
03, and the selector 904 outputs liquid crystal data 905.

Selection of data 901.903 is based on divided clock 919.903.
921.923, switching is performed for each frame and for each adjacent liquid crystal pixel.

In this embodiment, the weighting processing contents of decoders 900 and 902 are shown in FIG. 10, the weighting processing contents of decoders 906 and 908 are shown in FIG. 11, and the weighting processing contents of decoders 912 and 914 are shown in FIG. 12. For example, in FIGS. 9 and 10, if the display data of the Red signal 100 is 19' expressed in 4 bits, the first
7' decoded data 901 represented by 3 bits is weighted by the decoder 900 and output as liquid crystal display data 905. In the second frame, the second decoder 902 weights 3' decoded data 903 represented by 3 bits and outputs it as liquid crystal data 905. Below, the processing of the Green signal 101 system is also performed by Bl
Processing of the UE signal 102 system is also performed in a similar manner, and 3-bit liquid crystal display data 911 and 917 are generated respectively.

In FIGS. 10 to 12, when the first decoded data and the second decoded data are the same, the liquid crystal drive power according to the data is given as the liquid crystal display data. This makes it possible to obtain eight levels of liquid crystal display brightness. If they are different, switch the liquid crystal drive power supply according to each and provide it as display data for the liquid crystal.

Get a brightness level in between. This results in an additional 8
This made it possible to obtain a level of LCD display brightness.

According to the embodiments described above, display colors having the 16-level liquid crystal display brightness characteristics shown in FIG. 14 can be obtained.

The operation of the circuit that realizes the method for driving a liquid crystal display device according to claim 6.7 will be explained using FIGS. 15 to 7.

In FIG. 15, a flip-flop 1500 generates a liquid crystal alternating current clock 1501 that is inverted every frame from a vertical synchronizing signal 104.

This liquid crystal AC clock 1501 is connected to the flip-flop 1
By dividing the frequency by 502, the liquid crystal alternating current clock 1503 is inverted every two frames as shown in FIG.
generate. A selector 1504 selects one of the frame-by-frame liquid crystal alternating clocks.

The vertical line counter 1506 is connected to the horizontal synchronization clock 10
3 is generated, and the output of the least significant bit thereof becomes a signal 1508 that is inverted for each line. This signal 1508 is.

The EOR gate 15o9 and the frame-by-frame liquid crystal AC conversion signal 1505 generate a line-by-line liquid crystal AC conversion clock 15 whose polarity is inverted on a frame-by-frame basis, as shown in FIG.
It becomes 10.

A selector 1511 selects a liquid crystal alternating clock 1512 for each frame or line, and a flip-flop 1513 outputs a liquid crystal alternating clock 112 synchronized with the data shift clock.

[Effects of the Invention] According to the present invention, different weighting is performed on the display data of each color of R, G, and B, so that it is possible to obtain brightness characteristics that match human visual characteristics for any color in the same way. There is an effect that it can be done.

In addition, in order to switch the weighting of display data for each frame, an X driving means having an 8-level luminance display capability is used to achieve 16-level luminance display. Figure 1 shows a liquid crystal display device according to an embodiment of the present invention. Block diagram, FIG. 2 is a block diagram of a conventional liquid crystal display device, FIG. 3 is a detailed block diagram of the X@ driving means shown in FIG. 2, and FIG. 4 is a detailed block diagram of the X@ driving means and Yl@l shown in FIG. 2. The drive means operation timing diagram, Figure 5 is the operation timing diagram of the conventional liquid crystal AC converting clock, and Figure 6 is the operation timing diagram of the conventional liquid crystal alternating current clock.
The operation timing diagram of the two-level liquid crystal voltage selection means shown in FIG. 7 is a pixel configuration diagram of the liquid crystal panel shown in FIG.
The figure is a detailed block diagram of the xg drive means shown in FIG. 1, FIG. 9 is an operation timing diagram of the 8-level voltage selection means shown in FIG. 8, and FIG. 10 is a detailed block diagram of the liquid crystal drive signal generation means shown in FIG. 1. 11 is a detailed diagram of the weighting of the Red signal, and FIG. 12 is a detailed diagram of the weighting of the Green signal.

FIG. 13 is a detailed diagram of the weighting of the Blue signal, FIG. 14 is a luminance characteristic diagram of the 16-gradation display according to this embodiment, and FIG. 15 is a block diagram of the circuit that generates the liquid crystal AC clock of this embodiment. 16 and 17 are operation timing diagrams of the liquid crystal alternating current clock shown in FIG. 15.

106... 8-level liquid crystal drive signal generation means, 113.
...Y drive means, 115...X drive means.

117...Electric circuit, 120...Voltage selector.

122...Liquid crystal panel.

Perforation No. 13 No.-Dt Me-D (Inertia-1) Mae-D Tsukasa No. 20 //3 No. 40 ((1) Horizontal 70・Nof data (b) -7to7o,,7 l-111go]"l "7f 1111go""L P01 mouth (a) lie; start 7o-v4 log" - Youeeeeeeeeeeee (d) lbeB (t-7o,,) 205 No. 60 No. 8 [21 No. 70 1 F- ItoN do soto (N x 3 strokes) No. 9 (a) Water"F7077//f) (b) Tape shift 7o-Noah ///"-1-111111-[ ]- ]]Chouguchijuchoshi--J1choguchishiku41-ρ2 Cノ)×-03 箪l0L2]! 75 [121 Original 11 Figure 140 1Il! 1Jp4゜No. 15 @ (Q) Lie;su f-door or7ttM reed 160''-1-1111111'']- No. 170 ((2) U4''-7-9-hD- t7 108 (b > Tree 5 Kuro・,) /lD +c) 2 females 1 mating 1 (Ihiku Otsu 7112"] --111111"1-111-1Kankawa-1 11 "old and new and methodical pressure one---U day"-

Claims (1)

[Claims] 1. An active matrix liquid crystal panel in which each display pixel section is composed of a switching element, a liquid crystal, and an additional capacitor, and a voltage of n levels (n is an integer) selected from the input liquid crystal display data. In a liquid crystal display device consisting of an X driving means that can obtain display colors with n-level luminance characteristics by applying voltage to each display pixel section, multi-gradation (multi-color) display data of input interface signals and display synchronization 1. A method for driving a liquid crystal display device, comprising: a liquid crystal driving means for inputting a signal, converting the signal into a driving signal for the liquid crystal display device, and performing display. 2. In the liquid crystal display device according to claim 1, a first conversion means converts input display data of 2n levels into n-level liquid crystal display data in which each level is weighted during the first frame drive; a second converting means for converting 2n-level input display data into n-level liquid crystal display data in which each level is weighted when driving the frame; and generated from the first converting means and the second converting means. A multi-gradation control method for a liquid crystal display device, characterized in that a selection means is provided for switching liquid crystal display data to be supplied to the X driving means during each frame drive to obtain a display color having a luminance characteristic of 2n level. 3. In the multi-gradation control method according to claim 2, the display color of the input interface signal is Red, Green, Blue.
A multi-gradation control method for a liquid crystal display device, characterized in that, in the case of color data of e, weighting processing of a conversion means for converting into liquid crystal display data is different for each display color. 4. In the multi-gradation control method according to claim 2, display colors with low luminance levels are obtained by applying different voltage levels to the liquid crystal in the first frame and the second frame through the weighting process. , the display color with a high brightness level is the first
A multi-gradation control method for a liquid crystal display device, characterized in that the same voltage level is applied to the liquid crystal in the first frame and the second frame to obtain display colors. 5. In the multi-gradation control method according to claim 2, even if display data of the same level is supplied to adjacent display pixels from the input interface signal, the weighting process of the conversion means for converting into the display data for liquid crystal is performed so that the A multi-gradation control method for a liquid crystal display device, characterized in that the converting means converts the liquid crystal display data after weighting processing to be different in matching display pixel portions. 6. A method for driving a liquid crystal display device according to claim 2, wherein the voltage applied to the liquid crystal is changed to AC for two frames. 7. The method of driving a liquid crystal display device according to claim 6, wherein the voltage applied to the liquid crystal is changed to alternating current for each vertical line.