CN1797074A - LCD display element and its drive method - Google Patents
LCD display element and its drive method Download PDFInfo
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- CN1797074A CN1797074A CN 200410011537 CN200410011537A CN1797074A CN 1797074 A CN1797074 A CN 1797074A CN 200410011537 CN200410011537 CN 200410011537 CN 200410011537 A CN200410011537 A CN 200410011537A CN 1797074 A CN1797074 A CN 1797074A
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 206
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Abstract
The invention provides a liquid crystal display component with good display characteristics, comprising: plural light sources emitting lights of different colors; a liquid display part able to selectively control light transmitting state and light screening state; and a control circuit, by time sharing, dividing a frame into plural subframes, making any number of light sources emit lights in each subframe and synchronously controlling the light transmitting and screening states of plural display regions of the liquid display part with light emission.
Description
Technical field
The present invention relates to a kind of liquid crystal display cells (LCD), particularly sequence mode liquid crystal display cells and driving method thereof.
Background technology
As prior art, known have a method of using color filter in order to make the liquid crystal display cells colorize.In using the liquid crystal display cells of color filter, use the back of the body illuminator of white light, make liquid crystal cells this white light of transmission optionally with color filter of three primary colors (red (R), green (G), blue (B)) for example, carry out colour demonstration thus.But in the method, owing to be the light that takes out selected wavelength region may from white light, so the utilization ratio of light is lower, and a zone can only show the color corresponding with the color filter color of this part.And, owing to need to make color filter, so production cost is also high.
Also propose to have a kind of sequence mode liquid crystal display cells.In the sequence mode liquid crystal display cells on the scene, the back of the body illuminator of display panels has a plurality of light sources that send different colours.One side makes the luminous action of these light sources timesharing sequentially repeatedly, one side is carried out the switching (printing opacity/shading) (switching of liquid crystal cell and the back of the body the luminous of illuminator are carried out simultaneously) of liquid crystal display cells according to the time of light source luminescent, utilize human eye to the integration capabilities of time (time secondary color synthetic) thus, make a display pixel show various Show Colors.
The light source of back of the body illuminator for example uses trichromatic light emitting diode (LED).The response time of LED is number nanosecond.As the light source of back of the body illuminator, the response time of the general before this cold-cathode tube (CCFL) that uses is 10 milliseconds approximately, so in contrast to this, and fast 3 more than the order of magnitude of the response time of LED.Therefore, switch each color and also can not bring uncomfortable colour to show even can realize timesharing to human eye.
Fig. 9 is the sequential chart of an example of the demonstration control of the expression liquid crystal display cells that makes use sequence mode.With reference to Fig. 9 a LCD drive method of sequence mode is described.
Shown in " light source " of going up most field among the figure, (red (R), green (G), blue (B)) is luminous according to the reiteration of red (R), green (G), blue (B) for three-color light source.Each light source order luminous once during call 1 frame.1 image duration T
fBe divided into a plurality of subframes, T during each subframe
sIn a part (T between light emission period
1) carry out the bright lamp of the light source of particular color.In order to carry out the superposition colour mixture from the light of a plurality of light sources, expect 1 image duration T
fFor example be (frame rate is more than the 50Hz) below 20 milliseconds.
When using three-color light source, 1 image duration T
fBe made as 20 milliseconds, Ts is about 6.67 milliseconds during the subframe.The response speed of nematic crystal is several milliseconds, for example is 2～5 milliseconds.Therefore, when using the liquid crystal display cells of nematic crystal, any light source (carries out the transition period T of the printing opacity shading of liquid crystal during all non-luminous in subframe
t) for example be 2～5 milliseconds.Therefore, the time T of a light source luminescent
1It is 1.67～4.67 milliseconds.
Among the figure, from the 2nd field (a) to the end field (h) expression be used to show the driving sequential chart of the liquid crystal cells of R (red), G (green), B (indigo plant), C (viridescent), M (dark red), Y (Huang), W (in vain) and these eight kinds of colors of BK (deceiving).In all sequential charts of (a)～(h), during (height) position, the liquid crystal cells of expression liquid crystal display cells was in the state of printing opacity above broken line was positioned at.During (low) position, the expression liquid crystal cells was in light, the lighttight state of blocking below broken line was positioned at.Switching the transition period that sees through with shading, transmitance gradually changes.Simple painted goes out the state with (just) position about the linear change connection in the drawings.
With reference to (a) sequential chart that shows R (red).Liquid crystal cells carries out being controlled so as to printing opacity in the initial subframe of rubescent look (R) light in 1 frame.Between the light emission period beyond during rubescent look (R) light (green-emitting (G) and blueness (B) light during), liquid crystal cells is controlled so as to the shading state.Redness (R) when therefore, liquid crystal cells shows according to time integral.
With reference to (b) sequential chart that shows G (green).Liquid crystal cells carries out being controlled so as to printing opacity in the 2nd subframe of green-emitting (G) light in 1 frame.Between the light emission period beyond during green-emitting (G) light, liquid crystal cells is controlled so as to the shading state.Green (G) when therefore, liquid crystal cells shows according to time integral.
With reference to (c) sequential chart that shows B (indigo plant).Liquid crystal cells turns blue in 1 frame and is controlled so as to printing opacity in the last subframe of look (B) light.Between the light emission period beyond during the look that turns blue (B) light, liquid crystal cells is controlled so as to the shading state.Blueness (B) when therefore, liquid crystal cells shows according to time integral.
With reference to (d) sequential chart that shows C (viridescent).C (viridescent) is that the look superposition by green (G) light and blueness (B) light obtains.Liquid crystal cells is controlled so as to printing opacity from the 2nd subframe of carrying out green-emitting (G) light to the continuing phase of the last subframe of the look that turns blue (B) light in 1 frame.Between light emission period in addition, liquid crystal cells is controlled so as to the shading state.Dark green (C) when therefore, liquid crystal cells shows according to time integral.
With reference to (e) sequential chart that shows M (dark red).M (dark red) is that the look superposition by red (R) light and blueness (B) light obtains.Liquid crystal cells is carrying out between the light emission period of last subframe of the initial subframe of rubescent look (R) light and the look that turns blue (B) light (and from during the look that turns blue (B) light of the last subframe of frame the continuing phase during rubescent look (R) light of the initial subframe of the frame of back) and is being controlled so as to printing opacity in 1 frame.Between light emission period in addition, liquid crystal cells is controlled so as to the shading state.Peony (M) when therefore, liquid crystal cells shows according to time integral.
With reference to (f) sequential chart that shows Y (Huang).Y (Huang) is that the look superposition by red (R) light and green (G) light obtains.Liquid crystal cells is controlled so as to printing opacity from the initial subframe of carrying out rubescent look (R) light to the continuing phase of the 2nd subframe of carrying out green-emitting (G) light in 1 frame.Between light emission period in addition, liquid crystal cells is controlled so as to the shading state.Yellow (Y) when therefore, liquid crystal cells shows according to time integral.
With reference to (g) sequential chart that shows W (in vain).W (in vain) is that the look superposition by red (R) light, green (G) light and blueness (B) light obtains.Liquid crystal cells often is controlled so as to printing opacity.White (W) when therefore, liquid crystal cells shows according to time integral.
With reference to (h) sequential chart that shows BK (deceiving).Liquid crystal cells is controlled so as to light tight usually.Therefore, liquid crystal cells shows black (BK).
Make the use serial method like this, do not use color filter, and drive color light source and liquid crystal cells, can carry out colour and show by timesharing.Make under the situation that the liquid crystal display cells of sequence mode shows at red (R) that use frame rate as 50Hz, green (G), blue (B) three-color light source, can show red (R), green (G), blue (B), dark green (C), dark red (M), yellow (Y), white (W) and black (BK) eight kinds of colors.By adjusting the time of liquid crystal printing opacity, can show multiple color a viewing area.In addition, under the situation of the back of the body illuminator of the LED that uses red (R), green (G), blue (B), flow through the electric current of each LED, can adjust colour balance by control.
Illustrated that more than each liquid crystal cells is carried out printing opacity/shading controls the situation that shows eight kinds of colors, if but shades of colour is adopted middle tone, also can synthesize many medium tones.
But, watch display part (dark green (C), dark red (M), yellow (Y), white (the W)) one side that obtains by the superposition colour mixture more than the dichromatism to blink under the situation of eye in one side, or the situation that sight line is staggered from the display part is inferior, observe the phenomenon of the color moment separation of each light source sometimes, promptly so-called colour break-up phenomenon.For example, with sight line under the situation about staggering of white (W) display part, seem red (R), green (G), blue (B) colour band sometimes and be the holder shape of tail continuously.Obviously produce the colour break-up phenomenon around during dim light.For example, when nighttime driving is equipped with the automobile of a sequence mode monitor, with sight line when monitor staggers, produce violent colour break-up sometimes.
In order to improve the display quality of liquid crystal display cells, propose to use the fast liquid crystal of response speed, for example strong dielectric liquid crystal has carried out the liquid crystal display cells of optimizing (for example, with reference to patent documentation 1 and 2) to structure and control.
Summary of the invention
The objective of the invention is to, a kind of the have liquid crystal display cells of good display characteristic and the driving method that can realize the liquid crystal display cells of good display characteristic are provided.
According to a liquid crystal display cells that viewpoint provides of the present invention, have: a plurality of light sources that glow color is different; Can optionally control the liquid crystal display part of light transmission state and shading state; And control circuit, a frame timesharing is divided into a plurality of subframes, in each subframe, make the light source luminescent of any amount, with light transmission state, the shading state of a plurality of viewing areas of the described liquid crystal display part of this luminous synchro control.
This liquid crystal display cells since do not rely on observer's vision the time secondary color synthesis demonstration, so be can not produce colour break-up, and can realize the liquid crystal display cells of good demonstration.
In addition, the driving method of the liquid crystal display cells that other viewpoints according to the present invention provide, liquid crystal display cells has: a plurality of light sources that glow color is different; Can optionally control the liquid crystal display part of light transmission state and shading state; And control circuit, one frame timesharing is divided into a plurality of subframes, in each subframe, makes the light source luminescent of any amount, with light transmission state, the shading state of a plurality of viewing areas of the described liquid crystal display part of this luminous synchro control, comprise:, make the step of the light source luminescent that forms desired color in each subframe; In each subframe, the viewing area of expectation is controlled to the step of light transmission state, by control, make in other subframes, to be controlled so as to the shading state, and in certain subframe, make the light source of multiple color simultaneously luminous in the viewing area that certain subframe forms light transmission state.
The driving method of this liquid crystal display cells is not owing to rely on the time secondary color synthesis of observer's vision, so can realize can not producing the good demonstration of colour break-up.
According to the present invention, can provide liquid crystal display cells with good display characteristic and the driving method that can realize the liquid crystal display cells of good display characteristic.
Description of drawings
Fig. 1 is the approximate vertical view of display part of the liquid crystal display cells that uses in preliminary experiment of expression comparative example.
Fig. 2 is the table of an example of control of luminous and liquid crystal aligning state of the liquid crystal display cells of expression the 1st embodiment.
Fig. 3 is the vertical view of display part of the liquid crystal display cells of expression the 2nd embodiment.
Fig. 4 (A) is to be low light level pencil attitude at preceding light modulation, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 72km/h (low speed) shows, and (B) table of content of luminous and liquid crystal aligning state of the demonstration of (A) is carried out in expression control.
Fig. 5 (A) forms the strong beam state at preceding light modulation, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 83km/h (middling speed) shows, and (B) table of content of luminous and liquid crystal aligning state of the demonstration of (A) is carried out in expression control.
Fig. 6 (A) forms the strong beam state at preceding light modulation, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 106km/h (at a high speed) shows, and (B) table of content of luminous and liquid crystal aligning state of the demonstration of (A) is carried out in expression control.
Fig. 7 is the summary section of the liquid crystal display cells of expression the 3rd embodiment.
Fig. 8 (A) is the vertical view of a pixel of expression point type active matrix liquid crystal display device, (B) is the cut-open view along the 8B-8B line of (A).
Fig. 9 is the sequential chart of an example of the demonstration control of the expression liquid crystal display cells that makes use sequence mode.
Among the figure: D1～D4 viewing area; 1a～1g viewing area; 2a～2g viewing area; 3a～3g viewing area; Light modulation status display area before 4; 5 " speed " literal viewing area; 6 " km/h " literal viewing area; 11 polarizing films; 12 glass substrates; 13 common electrodes; 14 alignment films; 15 liquid crystal layers; 16 alignment films; 17 field electrodes; 18 glass substrates; 19 polarizing films; 20 light guide plate light diffusing boards; The 21LED array; 22 display panels; 13 control device; 24 back of the body illuminators; 25TFT; 26 display parts; 27 pixel electrodes.
Embodiment
Can the application's inventors realize good demonstration in order to confirm to produce colour break-up under which kind of situation, do not produce colour break-up under which kind of situation, carried out preliminary experiment.
The application's inventors at first as a comparative example, have made the liquid crystal display cells according to the state of orientation (printing opacity/shading state) of its luminous and liquid crystal of sequential control shown in Figure 9, and have observed its display quality.
As liquid crystal display cells, (Twisted Nematic-Liquid Crystal Display TN-LCD), uses the LED of red (R), green (G), blue (B) to the twisted nematic liquid crystals display element of use common-black type pattern as light source.Configuration is carried out the synthetic control device of controlling of time-division color according to sequential shown in Figure 9 on LCD and LED, has made the TN-LCD of the field sequence mode that comprises them.
Fig. 1 is the approximate vertical view of the display part of the liquid crystal display cells that uses in the preliminary experiment of expression comparative example.The display part forms 4 viewing area D that comprise the part that do not overlap each other
1～D
4At each viewing area D
1～D
4In, the state of orientation that can independently change liquid crystal also independently shows.In comparative example, 4 viewing area D have been carried out making
1～D
4The identical control of liquid crystal aligning state.
1 image duration T
fBe made as 16.5 milliseconds (establish frame rate and be about 60.6Hz), bundle T image duration
sBe made as 5.5 milliseconds.Because employed TN-LCD has for the performance that rises and descend and all can respond in about 2 milliseconds, so any light source (is carried out the transition period T of the printing opacity shading of liquid crystal during all non-luminous
t) be made as 2.5 milliseconds, each LED of red (R), green (G), blue (B) luminous during T
1Be made as 3.0 milliseconds.
Carry out time sequence control, observe the display part of TN-LCD, at viewing area D based on (a)～(h) of Fig. 9
1～D
4Produced colour break-up when showing dark green (C), peony (M), yellow (Y), white (W).Particularly when display white (W), colour break-up is obvious, and the observer blinks at every turn and at the moment can both feel the separation of color.And when observing under the state of the house that this TN-LCD is turned off the light than dimness, colour break-up is obvious.
Then, to each viewing area D of the display part of liquid crystal display cells shown in Figure 1
1～D
4Carried out the control of the state of orientation of liquid crystal.At viewing area D
1, D
2, D
3And D
4In, respectively according to the state of orientation of Fig. 9 (a) and (b), (c) and sequence change liquid crystal (h).As a result, at viewing area D
1～D
4In, confirm the demonstration of red (R), green (G), blue (B) and black (BK) respectively simultaneously continuously.Under the various conditions of blinking eyes or the house being dimmed out, observe, unconfirmed to colour break-up.Distinguish if do not rely on the color of time-division synthetic (color based on human eye is synthetic), show, also do not produce colour break-up even in picture, carry out shades of colour.
Then, make viewing area D
1～D
4The liquid crystal aligning state identical, in 100 initial image durations, according to the state of orientation of the sequential control liquid crystal of Fig. 9 (a).In the 2nd, the 3rd and the 4th 's 100 image durations, control according to (b), (c) and the sequential (h) of Fig. 9 respectively.In addition, between each 100 image duration, make the shading state that is oriented to of liquid crystal in 2 image durations.
(the viewing area D in the display part
1～D
4) in, order has been carried out the demonstration of red (R), green (G), blue (B) and black (BK).Do not produce under this situation yet and follow the colour break-up of blinking eye or house illuminance reduction etc.
In the liquid crystal display cells of sequence mode on the scene, in multiple color luminous repeatedly of 1 infraframe sequential, during any colour light emitting only, for example only comprising 1 subframe during in the part between light emission period at least during, make liquid crystal form light transmission state, perhaps during certain colour light emitting whole, for example during whole in 1 frame, make liquid crystal form the shading state, even when using response speed, also can carry out can not producing the good demonstration of display quality of colour break-up thus for several milliseconds liquid crystal display cells.
The application's inventors have made the liquid crystal display cells with control content control device different with the liquid crystal display cells of comparative example, as the liquid crystal display cells of the 1st embodiment.Use TN-LCD and the LED identical with comparative example, and setting and comparative example and confirm example identical 1 image duration T
fT during (frame rate), the subframe
s, transition period T
t, and luminous T
1
In the liquid crystal display cells of the 1st embodiment, make the light emitting control of LED different with the situation of comparative example.Switch printing opacity/shading the liquid crystal aligning state control only make have only any colour light emitting during, make liquid crystal form light transmission state, perhaps during any colour light emitting whole, make liquid crystal form the shading state.
In comparative example, make 3 LED sequentially bright one by one lamp in 1 frame of rubescent look (R), green (G), blue (B) light.Therefore, can carry out the glow color (three primary colors) that the colored color that shows is limited to LED.In the 1st embodiment, in 1 frame between the light emission period of at least one subframe, make luminously simultaneously and carry out while superposition colour mixture (color is synthesized simultaneously) more than or equal to 2 trichromatic LED, obtain glow color (mixed luminescence look) thus.In addition, in each subframe,, make them see through (incident), in picture, carry out the demonstration of multiple color simultaneously to the viewing area that differs from one another by the different respectively light of the color of superposition colour mixture acquisition simultaneously.
The balance of the luminous intensity of simultaneously luminous LED more than or equal to 2 can be able to easily change by luminous range content, so can show multiple color.But the number of colors that can show simultaneously is for only Duoing 1 quantity than the sub-frame number in 1 frame.By forming the shading state, can show black (BK) at whole light emission period chien shih liquid crystal.
In addition, the sub-frame number in 1 frame is not limited to 3, can be divided into 2 or more than or equal to 4.Be divided under the situation of a plurality of subframes, the number of colours quantitative change that can show simultaneously is many, but for prevent the flicker, can not prolong 1 frame during T
fSo, one sub-image duration T
sShorten, so the fluorescent lifetime T of LED
1Shorten, show deepening.And, because time (the transition period T that the printing opacity shading of liquid crystal conversion is spent
t) also shorten, so according to circumstances produce the problem that can not follow response speed of liquid crystal.Be divided under 2 the situation, owing to can prolong T between the light emission period of LED
1So, can realize the demonstration that becomes clear.
Fig. 2 is the table of an example of control of luminous and liquid crystal aligning state of the liquid crystal display cells of expression the 1st embodiment." 1 " expression LED in " lighting lamp state of light source " in the table is luminous, and " 0 " expression is not luminous.The state of orientation of the liquid crystal cells printing opacity of " 1 " expression liquid crystal display cells in " show state of liquid crystal ", the state of orientation of " 0 " expression liquid crystal cells shading.In addition, in the liquid crystal display cells of the 1st embodiment, for each viewing area D of display part shown in Figure 1
1～D
4Liquid crystal can distinguish independent its state of orientation of control.
T between the light emission period of subframe 1 (initial subframe)
1, all LED of red (R), green (G), blue (B) are luminous.Therefore, back of the body illuminator sends white (W) light.
At this moment, liquid crystal and luminous synchronous is controlled so as at viewing area D
1Be the state of orientation of printing opacity, at other viewing areas D
2, D
3, D
4In be lighttight state of orientation.
T between the light emission period of subframe 2 (the 2nd subframe)
1, green (G) LED is luminous.Therefore, send green (G) light from back of the body illuminator.
At this moment, liquid crystal and luminous synchronous is controlled so as at viewing area D
2Be the state of orientation of printing opacity, at other viewing areas D
1, D
3, D
4In be lighttight state of orientation.
T between the light emission period of subframe 3 (the 3rd subframe)
1, the LED of red (R) and green (G) is luminous.Therefore, send yellow (Y) light from back of the body illuminator.
At this moment, liquid crystal and luminous synchronous is controlled so as at viewing area D
3Be the state of orientation of printing opacity, at other viewing areas D
1, D
2, D
4In be lighttight state of orientation.
During the state of orientation of and liquid crystal luminous, carry out four kinds of colors simultaneously in display part shown in Figure 1 and show according to control shown in Figure 2, that is, and viewing area D
1Display white (W), viewing area D
2Show green (G), viewing area D
3Show yellow (Y), viewing area D
4Show black (BK).
Under the situation of the liquid crystal display cells of the 1st embodiment, each viewing area D
1～D
4Be controlled so as to T between the light emission period that comprises 3 any subframes in the subframe
1At least a portion during in, liquid crystal is in light transmission state (viewing area D
1～D
3), perhaps during comprising all to carry out whole during luminous (for example all subframes), liquid crystal cells is in the shading state.
Under the situation of the color beyond the color that shows led light source, be not as in the past the field serial method, the timesharing of carrying out multiple glow color is luminous, time synthesis by observer's eyes, make the people see their secondary colour in the display part, but, directly on the display part, show from carrying on the back the light that illuminator penetrates the secondary colour that is formed by a plurality of light sources while superposition colour mixtures.That is, the illuminant colour of back of the body illuminator and the demonstration look of display part are directly identical, and do not rely on observer's recognition reaction.
No matter be when the demonstration of the liquid crystal display cells of simultaneously simultaneously observing or under dim environment, observe the 1st embodiment nictation, under various environment, all do not observe colour break-up.
By the state of orientation of luminous and liquid crystal is controlled to, make certain subframe in 1 frame from the light transmission viewing area that back of the body illuminator penetrates, make light not see through this viewing area in other colors that penetrate from back of the body illuminator of this frame, can realize good demonstration.
In the liquid crystal display cells of the 1st embodiment, illustrated and used 3 LED to show the situation of multiple color, but the quantity of LED is not limited to 3.For example, can use 2 LED to obtain the Show Color that three looks add (black (BK)) of the same colour.For example, can use yellow (Y) and blue (B) LED, carry out the demonstration of yellow (Y), blue (B) and white (W) this three look and black (BK).
Then, the application's inventors have made the liquid crystal display cells as structure liquid crystal display cells, that have the display part of second fact Example and the control content control device different with the liquid crystal display cells of comparative example and the 1st embodiment.But the policy of control is identical with the 1st embodiment.
Promptly, about luminous control, not as comparative example, make redness (R), green (G) and the bright lamp of blue (B) LED order in each subframe in 1 frame, and according to every frame repeatedly should the action luminous, but identical with the 1st embodiment, make the bright lamp of each led light source, penetrate from back of the body illuminator so that be presented at the light of the color of display part.And, the control of liquid crystal is in certain viewing area, only have only any colour light emitting during, for example only comprising the part between light emission period at least in the sub-image duration during, make liquid crystal form light transmission state, perhaps during any colour light emitting whole, for example during whole in 1 frame, make liquid crystal form the shading state.
Use the twisted nematic identical with comparative example etc. (Twisted Nematic, TN) liquid crystal and LED, 1 image duration T
fT during (frame rate), the subframe
s, transition period T
t, and light emission period between T
1Be set at identical with comparative example.
In the liquid crystal display cells of the 2nd embodiment, by control, the multiple color that can free selection can show simultaneously, and selected color combination is changed along with the process of time.The liquid crystal display cells of the 2nd embodiment is the liquid crystal display cells that can show multiple Show Color.
Fig. 3 is the vertical view of display part of the liquid crystal display cells of expression the 2nd embodiment.The liquid crystal display cells of the 2nd embodiment for example is installed on vehicle etc.Near the central portion of display part, be formed with the group field viewing area 1a～1g, 2a～2g, the 3a～3g that are divided into 3 units that adjoin each other,, can show a numeral, can show 3 figure place numerals by them by making wherein several bright lamps respectively.Left side in the viewing area that can show 3 figure place numerals forms " speed " literal viewing area 5, light modulation status display area 4 before above the right side, forming, and below the right side, form " km/h " literal viewing area 6.
Near the speed of 3 numeral vehicles the central portion.Expression speed is come by bright lamp in " speed " literal viewing area 5.Display speed unit is come by bright lamp in " km/h " literal viewing area 6.Light modulation was in the strong beam state before preceding light modulation status display area 4 was represented by bright lamp, was in low light level pencil attitude by light modulation before the expression of turning off the light.
Each field (viewing area 1a～1g, 2a～2g, the 3a～3g) utilize different colours to show that can represent the viewing area of 3 bit digital according to the velocity variations of vehicle.The speed of vehicle is controlled so as to for example shown in green numeral when low vehicle speeds, is shown as yellow numeral when driving at moderate speed, shown in red numeral when running at high speed.
Use Fig. 4～Fig. 6 that the control and the demonstration of the liquid crystal display cells of the 2nd embodiment are described.In the liquid crystal display cells of the 2nd embodiment, the state of car speed that changes along with effluxion and preceding light modulation is controlled as the part of input.1 frame is divided into 3 subframes, simultaneously picture (display part) is divided into 3 indication ranges.Utilize the luminous of initial subframe, can carry out the demonstration of " speed " literal viewing area 5 and " km/h " literal viewing area 6.Utilize the luminous of the 2nd subframe, can represent that the numeral of car speed shows.Utilize the luminous of the 3rd subframe, the demonstration of light modulation status display area 4 before can carrying out.In addition, the meaning of " 0 " and " 1 " in Fig. 4 (B), Fig. 5 (B) and Fig. 6 (B) " lighting lamp state of light source " and " show state of liquid crystal " is with shown in Figure 2 identical.
Fig. 4 (A) is that light modulation is a low light level pencil attitude before being illustrated in, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 72km/h (low speed) shows, Fig. 4 (B) are the tables of content of state of orientation of the luminous and liquid crystal of the expression control demonstration that is used to carry out Fig. 4 (A).
In the liquid crystal display of Fig. 4 (A), show " speed " with white (W), show " 72 " with green (G), show " km/h " with white.
With reference to Fig. 4 (B), in order to carry out the demonstration of Fig. 4 (A), T between the light emission period of subframe 1 (the 1st subframe)
i, make all LED of redness (R), green (G) and blue (B) luminous.Therefore, send white (W) light from back of the body illuminator.
At this moment, in the display part, be controlled in " speed " literal viewing area 5 and the state of " km/h " literal viewing area 6 printing opacities.
T between the light emission period of subframe 2 (the 2nd subframe)
1In, make green (G) LED luminous.Therefore, send green (G) light from back of the body illuminator.
At this moment, in the display part, be controlled to the state of 2a, 2b 8 viewing areas, 2c, 3a, 3b, 3d, 3e, 3g printing opacity.
T between the light emission period of subframe 3 (the 3rd subframe)
1In, make the LED of green (G) and blue (B) luminous.Therefore, send dark green (C) light from back of the body illuminator.
At this moment, in the display part, be controlled to the lighttight state in all display parts that makes.
For example, when controlling the state of orientation of luminous and liquid crystal like this, can realize the demonstration shown in Fig. 4 (A).
Fig. 5 (A) is that light modulation is the strong beam state before being illustrated in, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 83km/h (middling speed) shows, Fig. 5 (B) are the tables of content of state of orientation of the luminous and liquid crystal of the expression control demonstration that is used to carry out Fig. 5 (A).
In the liquid crystal display of Fig. 5 (A), show " speed " with white (W), show " 83 " with yellow (Y), show " km/h " with white, the demonstration of the sign of the bright lamp of light modulation before representing with dark green (C).
With reference to Fig. 5 (B), in order to carry out the demonstration of Fig. 5 (A), T between the light emission period of subframe 1 (the 1st subframe)
1, carry out the identical light emitting control of control with the subframe 1 shown in Fig. 4 (B).And the control of the state of orientation of liquid crystal is also identical with the control of the subframe 1 shown in Fig. 4 (B).
T between the light emission period of subframe 2 (the 2nd subframe)
1, make the LED of redness (R) and green (G) luminous.Therefore, send yellow (Y) light from back of the body illuminator.
At this moment, be controlled in the display part among 2a, 2b 12 viewing areas, 2c, 2d, 2e, 2f, 2g, 3a, 3b, 3c, 3d, the 3g, liquid crystal is the state of orientation of printing opacity.
T between the light emission period of subframe 3 (the 3rd subframe)
1, carry out the identical light emitting control of control with the subframe 3 shown in Fig. 4 (B).Therefore, send dark green (C) light from back of the body illuminator.
At this moment, only be controlled in the display part in preceding light modulation status display area 4, liquid crystal is the state of orientation of printing opacity.
For example, when controlling the state of orientation of luminous and liquid crystal like this, can realize the demonstration shown in Fig. 5 (A).
Fig. 6 (A) is that light modulation is the strong beam state before being illustrated in, the figure of the liquid crystal display that the driver's seat of the vehicle that travels with speed per hour 106km/h (at a high speed) shows, Fig. 6 (B) are the tables of content of state of orientation of the luminous and liquid crystal of the expression control demonstration that is used to carry out Fig. 6 (A).
In the liquid crystal display of Fig. 6 (A), show " speed " with white (W), show " 106 " with red (R), show " km/h " with white, the demonstration of the sign of the bright lamp of light modulation before representing with dark green (C).
With reference to Fig. 6 (B), in order to carry out the demonstration of Fig. 6 (A), T between the light emission period of subframe 1 (the 1st subframe)
1, carry out the identical light emitting control of control with the subframe 1 shown in Fig. 4 (B).And the control of the state of orientation of liquid crystal is also identical with the control of the subframe 1 shown in Fig. 4 (B).
T between the light emission period of subframe 2 (the 2nd subframe)
1, make redness (R) LED luminous.Therefore, send redness (R) light from back of the body illuminator.
At this moment, be controlled in the display part among 1b, 1c 13 viewing areas, 2a, 2b, 2c, 2d, 2e, 2f, 3c, 3d, 3e, 3f, the 3g, liquid crystal is the state of orientation of printing opacity.
T between the light emission period of subframe 3 (the 3rd subframe)
1, carry out the control of the state of orientation of light emitting control identical and liquid crystal with the control of the subframe 3 shown in Fig. 5 (B).
For example, when controlling the state of orientation of luminous and liquid crystal like this, can realize the demonstration shown in Fig. 6 (A).
In the liquid crystal display cells of the 2nd embodiment, the demonstration of " speed " literal viewing area 5 and " km/h " literal viewing area 6 is carried out in the control of the state of orientation of the luminous and liquid crystal by subframe 1.If vehicle is under steam, these two zones be controlled so as to continuous with white (W) show.
And the control of the state of orientation of the luminous and liquid crystal by subframe 2 shows the travel speed of vehicle.Travel speed is controlled so as to when using yellow (Y), high speed when using green (G), middling speed when low speed and shows with redness (R).
In certain frame, the light of the color different with the color of the light that sees through certain viewing area, if see through this viewing area in the later frame of this frame, then Show Color is changed.The modification of Show Color is as if the numeral of the liquid crystal display cells display speed of the 2nd embodiment shows control like that, can by make from certain frame from the beginning of the luminous light of the individual subframe of k (k is a natural number), with from the later frame of this frame from the beginning of individual luminous different the carrying out of light of subframe of k.And,, can carry out continuous demonstration if carry out identical in fact control at frame continuous more than two.
In addition, the control of the state of orientation of the luminous and liquid crystal by subframe 3, utilize dark green (C) to show before the lighting lamp state (strong or low light level bundle) of light modulation.
Under various environment, observed the demonstration of the liquid crystal display cells of the 2nd embodiment, unconfirmed to colour break-up.
In the above-described embodiments, 1 image duration T
fIn, even send under the situation of light (light of each subframe) of multiple color from back of the body illuminator, because the state of orientation of control liquid crystal makes it only see through the light of a certain color a viewing area, so can realize can not producing the demonstration of the liquid crystal display cells that look black, display characteristic is good.
Fig. 7 is the summary section of the liquid crystal display cells of expression the 2nd embodiment.For example, the liquid crystal layer 15 that is formed by twisted nematic liquid crystals in two alignment films 14,16 clampings.On alignment films 14,16, for example handle and give the inclination angle, come the orientation of the liquid crystal of the contact alignment films 14,16 that comprises in the standard solution crystal layer 15 thus by friction.
Form and contact the common electrode 13 of two alignment films 14,16 and the field electrode 17 corresponding respectively with each field display pixel.Between two electrodes, apply voltage, the state of orientation of the voltage change liquid crystal layer 15 that correspondence applies.By the change state of orientation, can make the light transmission that incides liquid crystal layer 15 or with its blocking.For clamping two electrodes, form glass substrate 12,18, on each glass substrate 12,18, form polarizing film 11,19.
Comprise liquid crystal layer 15, alignment films 14,16, common electrode 13, field electrode 17, glass substrate 12,18 and polarizing film 11,19, constitute display panels 22.Display panels 22 for example is often black pattern.
Have led array 21 and light guide plate light diffusing board 20 in polarizing film 19 sides that are formed at field electrode 17 sides, constitute the back of the body illuminator 24 that comprises them.
Led array 21 has the different a plurality of light sources of glow color in the one side relative with light guide plate light diffusing board 20.For example, sequentially arrange the LED that sends redness (R), green (G) and blue (B) trichromatic versicolor light repeatedly.The photoconduction light that light guide plate light diffusing board 20 sends each LED from this led array 21 is brought into play effect as light-emitting zone by diffusion upward to whole surface.Under the luminous situation of the LED of multiple color, light guide plate light diffusing board 20 can carry out the light of these colors while superposition colour mixture and penetrate.The light that penetrates incides the liquid crystal layer 15 of display panels 22.
Under the situation of the light transmission liquid crystal cells that penetrates from back of the body illuminator 24, utilize the color of the light that sees through to show.Under the situation of being interdicted, utilize black (BK) to show by liquid crystal cells.
As illustrating among the 1st and the 2nd embodiment, make the synchronous control of state of orientation of luminous and liquid crystal layer 15 of back of the body illuminator 24 by control device 23, make at T image duration
fIn only make a kind of light transmission of color or do not see through a viewing area.In addition, viewing area and the relation of the luminous subframe in this viewing area is fixed.Can change this relation as required.
Fig. 8 (A) is the vertical view of a pixel of expression point type active matrix liquid crystal display device, and Fig. 8 (B) is the figure along the 8B-8B line of Fig. 8 (A).Be that example is illustrated with the field liquid crystal display cells before this, but the liquid crystal display cells of embodiment also can be a type.
With reference to Fig. 8 (A), in a type active matrix liquid crystal display device, be provided with in pixel point display part 26 that the printing opacity/shading by liquid crystal cells shows and the TFT25 (Thin Film Transistor) that carries out the control of a display part 26.
With reference to Fig. 8 (B), with the difference of the liquid crystal display cells of the 2nd embodiment shown in Figure 7 be pixel electrode 27 and TFT25 to be set to replace field electrode 17.Other inscapes and function thereof are identical with the liquid crystal display cells of the 2nd embodiment.
Printing opacity/the shading of some display part 26 is to carry out according to the voltage that is applied between pixel electrode 27 and the common electrode 13.Apply voltage (drive signal) and pass to pixel electrode 27 by TFT25.If use some display part 26, can carry out the demonstration of different modes at the same area.Can set does not have overlapping a plurality of viewing areas, selects display mode, Show Color in each viewing area.
The light source of the liquid crystal display cells of embodiment can use the light source with multiple glow color.Except that LED, can use discharge tube and organic EL etc.
Use TN-LCD in an embodiment, but can use for example various LCD such as LCD of vertical orientating type.The LCD of preferred normal black pattern.This is because in normal white mode, the base part printing opacity beyond the display part, so the superposition colour mixture of the back of the body illuminator of the bright lamp of generation order, it is black to produce look in base part.But, for example,, also can use normal black pattern LCD in addition if the field liquid crystal display cells covers field part in addition by utilizing black matrix".
More than, according to embodiment the present invention has been described, but has the invention is not restricted to this.For example, industry personnel certainly carry out various changes, improvement, combination etc.
For example, as around the speed measuring instrument of automobile, be defined use color and also the purposes of discerning that do not allow to make a mistake aspect effective especially.
Claims (13)
1. a liquid crystal display cells is characterized in that having: a plurality of light sources that glow color is different; Can optionally control the liquid crystal display part of light transmission state and shading state; And control circuit, a frame timesharing is divided into a plurality of subframes, in each subframe, make the light source luminescent of any amount, with light transmission state, the shading state of a plurality of viewing areas of the described liquid crystal display part of this luminous synchro control.
2. liquid crystal display cells according to claim 1, it is characterized in that, a plurality of viewing areas of described liquid crystal display part do not overlap each other, described control circuit is by being controlled to light transmission state to different viewing areas in each subframe, thereby make a viewing area only when arbitrary sub-frame, become light transmission state, perhaps when all subframes, become the shading state.
3. liquid crystal display cells according to claim 1 and 2 is characterized in that, described control circuit is carrying out identical in fact control more than or equal to two continuous frames.
4. according to each described liquid crystal display cells in the claim 1～3, it is characterized in that described a plurality of light sources are LED.
5. liquid crystal display cells according to claim 4 is characterized in that, described a plurality of light sources are made of red, green, blue LED.
6. according to each described liquid crystal display cells in the claim 1～5, it is characterized in that described liquid crystal display part is a common-black type.
7. according to each described liquid crystal display cells in the claim 1～6, it is characterized in that described liquid crystal display part is formed by field.
8. according to each described liquid crystal display cells in the claim 1～6, it is characterized in that described liquid crystal display part is by forming.
9. according to each described liquid crystal display cells in the claim 1～8, it is characterized in that described control circuit is divided into a plurality of subframes that comprise the 1st subframe and the 2nd subframe during a frame, in described the 1st subframe and described the 2nd subframe, make different light source luminescents.
10. according to each described liquid crystal display cells in the claim 1～9, it is characterized in that, establish n for more than or equal to 2 integer, establish k for more than or equal to 1 and during smaller or equal to the integer of n, described control circuit is divided into n subframe during a frame, in the k subframe of the k subframe of the 1st framing and the 2nd framing after described the 1st framing, make different light source luminescents.
11. the driving method of a liquid crystal display cells is characterized in that, this liquid crystal display cells has: a plurality of light sources that glow color is different; Can optionally control the liquid crystal display part of light transmission state and shading state; And control circuit, be divided into a plurality of subframes during with a frame, in each subframe, make the light source luminescent of any amount, light transmission state, shading state with a plurality of viewing areas of the described liquid crystal display part of this luminous synchro control comprise:
Make the step of the light source luminescent that forms desired color in each subframe;
Be controlled to the step of light transmission state in the viewing area of each subframe handle expectation,
By control, make in other subframes, to be controlled so as to the shading state, and in certain subframe, make the light source of multiple color simultaneously luminous in the viewing area that certain subframe forms light transmission state.
12. the driving method of liquid crystal display cells according to claim 11 is characterized in that, also comprises:
2nd subframe different with described the 1st subframe in described the 1st frame penetrates the step of the light of 2nd color different with described the 1st color; With
In described the 1st subframe,, make the light transmission of described the 2nd color and the step that shows in the zone different with the transmission region of described the 1st color.
13. the driving method according to claim 11 or 12 described liquid crystal display cells is characterized in that, also comprises:
The 2nd frame after described the 1st frame, the zone of the described liquid crystal display part that shows through the light of described the 1st color in described the 1st frame sees through the light of the color different with described the 1st color and the step that shows.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231410B (en) * | 2007-01-25 | 2011-08-17 | 斯坦雷电气株式会社 | Liquid crystal display device and its manufacture method |
| CN103207477A (en) * | 2013-04-19 | 2013-07-17 | 精电(河源)显示技术有限公司 | Liquid crystal display device and control method thereof |
| WO2018076610A1 (en) * | 2016-10-31 | 2018-05-03 | 京东方科技集团股份有限公司 | Display device and control method therefor |
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| JPH0580716A (en) * | 1991-09-20 | 1993-04-02 | Nippon Telegr & Teleph Corp <Ntt> | Color liquid crystal display system |
| JP3533475B2 (en) * | 1994-04-05 | 2004-05-31 | カシオ計算機株式会社 | Liquid crystal display |
| JP3559922B2 (en) * | 1998-12-15 | 2004-09-02 | 富士通株式会社 | Liquid crystal display |
| JP2000275605A (en) * | 1999-03-25 | 2000-10-06 | Toshiba Corp | Liquid crystal display device |
| JP2000347156A (en) * | 1999-06-02 | 2000-12-15 | Rohm Co Ltd | Liquid crystal display element |
| JP4166448B2 (en) * | 2000-10-06 | 2008-10-15 | シャープ株式会社 | Active matrix liquid crystal display device and driving method thereof |
| US7030848B2 (en) * | 2001-03-30 | 2006-04-18 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display |
| KR100778845B1 (en) * | 2001-12-29 | 2007-11-22 | 엘지.필립스 엘시디 주식회사 | Method for operating lcd |
| JP4218249B2 (en) * | 2002-03-07 | 2009-02-04 | 株式会社日立製作所 | Display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231410B (en) * | 2007-01-25 | 2011-08-17 | 斯坦雷电气株式会社 | Liquid crystal display device and its manufacture method |
| CN103207477A (en) * | 2013-04-19 | 2013-07-17 | 精电(河源)显示技术有限公司 | Liquid crystal display device and control method thereof |
| CN103207477B (en) * | 2013-04-19 | 2014-08-20 | 精电(河源)显示技术有限公司 | Liquid crystal display device and control method thereof |
| WO2018076610A1 (en) * | 2016-10-31 | 2018-05-03 | 京东方科技集团股份有限公司 | Display device and control method therefor |
| US10627698B2 (en) | 2016-10-31 | 2020-04-21 | Boe Technology Group Co., Ltd. | Display device and method for controlling a display device |
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