CN100478746C - Field-sequential mode colour liquid crystal display - Google Patents
Field-sequential mode colour liquid crystal display Download PDFInfo
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- CN100478746C CN100478746C CNB2005100346462A CN200510034646A CN100478746C CN 100478746 C CN100478746 C CN 100478746C CN B2005100346462 A CNB2005100346462 A CN B2005100346462A CN 200510034646 A CN200510034646 A CN 200510034646A CN 100478746 C CN100478746 C CN 100478746C
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Abstract
The present invention relates to a field sequential mode color liquid crystal display. It includes the following several portions: liquid crystal display element; red, green and blue three groups of independent backlight sources; drive circuit for independently driving the above-mentioned display element and backlight sources; temperature inductor and correspondent control circuit. Said invention also provides its concrete working principle and operation method.
Description
Technical field
The present invention relates to a kind of field-sequential mode LCD.
Background technology
Adopted gradually in recent years Color Liquid Crystal Display mode---field-sequential mode liquid crystal display mode is different from traditional display mode at LCD panel internal configurations color filter film.Its advantage do not need to be the valency height, the color filter film that technology is numerous and diverse, and can reduce the energy loss that causes by color filter film absorption light, strengthen the color and the minimizing that show and control pixel.
But this field sequential liquid crystal display mode has its technical weakness, this display is by liquid crystal display cells, comprise three groups of RGBs independently the driving circuit of backlight and the above-mentioned LCD plate of drive and three groups of backlights of RGB form, when three groups of backlights of RGB are lighted respectively in certain sequence when work, the colour signal that is input to liquid crystal display cells is also corresponding with it, light a lamp time in cycle during no longer than 20 milliseconds at a RGB, and the shows signal of three groups of colors will be reduced into one group of original colorful image automatically in human brain.Because this mode requires response speed of liquid crystal faster than traditional, if the frame frequency that shows by image is that 70Hz calculates, the demonstration time of every kind of color has only 4.7 milliseconds, response speed of liquid crystal must be faster than this time.And the viscosity of liquid crystal material has the trend that descends and rise with ambient temperature, causes the response speed of liquid crystal material (particularly TN and stn liquid crystal material) obviously to descend when low temperature, is generally tens to the hundreds of millisecond, or even several seconds.Make response speed of liquid crystal when low temperature, can not satisfy the rapidly opened and closed requirement of field sequential liquid crystal display mode, and the LCD of present many occasions need be in outdoor application, comprise vehicle-mounted audio-video instrument, clock and watch, large-scale public information display screen etc. all need be worked under lower temperature sometimes, makes the field sequential liquid crystal display mode be difficult to drop into actual application.Though the response speed of many methods raising LCD is arranged, the problem that being difficult to when all effort all are not enough to really solve field sequential liquid crystal display mode low temperature in practicality normally shows at present.
Japanese documentation JP2002365611A discloses a kind of field-sequential mode colour liquid crystal display, this display has increased temperature sensor and correspondent control circuits on the basis of existing field-sequential mode colour liquid crystal display, when temperature sensor senses when environment temperature is higher or lower than a certain reference temperature, correspondent control circuits can improve or reduce the LCD frame frequency, make red by changing frame frequency, the proportional lengthening of demonstration time of green and Lan Sanse, thereby make LCD when environment temperature changes, this LCD also can keep showing preferably the time.But this frame frequency that reduces simply can easily reach the purpose that prolongs the demonstration time, and, frame frequency is impossible unrestrictedly to descend, and when frame frequency drops to 40Hz when following, flicker can appear in image.
Summary of the invention
The object of the present invention is to provide at lower temperature and do not reduce under the situation of frame frequency still can operate as normal field sequence LCD device.
Field-sequential mode colour liquid crystal display of the present invention is by liquid crystal display cells, comprise in three groups of the RGBs field-sequential mode colour liquid crystal display that independently driving circuit of backlight and above-mentioned liquid crystal display cells of drive and backlight is formed, temperature inductor and correspondent control circuits are set, make this temperature inductor when sensing environment temperature and be higher than predefined certain critical temperature, correspondent control circuits can make the shown two field picture of this liquid crystal display cells be made of the image that three groups of colors of RGB show respectively.And when this temperature inductor is being sensed environment temperature and is being lower than predefined certain critical temperature, the multiple color that correspondent control circuits can make the shown two field picture of this liquid crystal display cells be made up of three groups of backlights mixing of RGB under the situation that does not reduce frame frequency comprises red, green, blue, yellow, green grass or young crops, purple, white in the image that shows respectively of minimum a kind of maximum three kinds of colors constitute.And wherein the demonstration time of at least a color image will be longer than the demonstration time of any one color image in this critical temperature image that three groups of colors of RGB show respectively when above.
In order below critical temperature, to prolong the demonstration time of designated color image, considering that the multiple color of being made up of three groups of backlights of RGB comprises red at least, green, indigo plant, Huang, green grass or young crops, purple, during any three kinds of colors show respectively in white image construction one two field picture, can suitably adjust the time length of demonstration separately of three groups of colors, the demonstration time that needs the special color image of emphasizing is extended.But this method is not optimal selection.Because under the situation that does not reduce frame frequency, the demonstration time of other color images can reduce on the contrary.
The multiple color that can be made up of three groups of backlights of RGB when a two field picture comprises red, green at least, indigo plant, Huang, green grass or young crops, purple, white in during the shown image construction of any two kinds of colors, even do not reduce frame frequency, also can prolong the demonstration time of color image separately.
If change into multiple color that a two field picture can be made up of three groups of backlights of RGB comprise at least red, green, indigo plant, Huang, green grass or young crops, purple, during the shown image construction of any one color, even do not reduce frame frequency, the demonstration time of one group of color also can extend to original 3 times in white.And the type of drive of this state can be similar to the static drive mode of general T N, does not require that being closed in the frame time of liquid crystal finish, and it is many to allow response speed of liquid crystal to slow down, and this method is the most effective.
If reduce frame frequency simply certainly, can easily reach the purpose that prolongs the demonstration time, but frame frequency can not descend unrestrictedly, when frame frequency drops to 40Hz when following, flicker can appear in image.
If in critical temperature when up and down luminance variations is excessive, can be under the situation that does not change frame frequency the length of fluorescent lifetime by regulating every kind of color fluorescent tube control the size of briliancy.
Above-mentioned liquid crystal display cells below will not indicate the type of drive of using which kind of type no matter be that driven with active matrix LCDs and the simple LCDs that drives do not influence effect of the present invention.
Above-mentioned liquid crystal display cells can use the negative mode that shows, and also can use the mode that just shows, and during making alive, pixel is not light tight, shows black for the former.The latter is during making alive, pixel printing opacity, display backlight look.
The present invention is owing to adopted temperature inductor and correspondent control circuits in field-sequential mode colour liquid crystal display, make the field-sequential mode colour liquid crystal display that can't normally use at low temperatures inadequately because of response speed of liquid crystal when low temperature, can prolong the demonstration time of shades of colour image, reach the purpose of normal demonstration.
Description of drawings
Fig. 1 is the composition block scheme of field-sequential mode colour liquid crystal display of the present invention.
Fig. 2 is the liquid crystal display cells that uses among the 1st embodiment of the present invention and the synoptic diagram of backlight.
Fig. 3 is the displaying principle figure of field-sequential mode colour liquid crystal display when critical temperature is above that uses among the 1st embodiment of the present invention.
Fig. 4 is the displaying principle figure of field-sequential mode colour liquid crystal display when critical temperature is following that uses among the 1st embodiment of the present invention.
Fig. 5 is that field-sequential mode colour liquid crystal display of the present invention shows the temperature variant synoptic diagram of briliancy.
Fig. 6 is the displaying principle figure of field-sequential mode colour liquid crystal display when critical temperature is following that uses among the 2nd embodiment of the present invention.
Embodiment
The first embodiment of the present invention is the block scheme of novel field order LCD device shown in Figure 1, is made of following components, comprising: liquid crystal display cells 1; Comprise independently backlight 2 of three groups of RGBs; The driving circuit 3 of above-mentioned liquid crystal display cells of drive and backlight; Temperature inductor 4; Correspondent control circuits 5.
The liquid crystal display cells 1 of present embodiment as shown in Figure 2, have at 2 medial surfaces and enclose liquid crystal layer 8 between the glass substrate 7 of transparent conductive film 6, this transparent conductive film 9 has a plurality of pixels 9 that are arranged, and each leadedly is connected with external drive circuit 3, and each pixel 9 can be printed independently by driving circuit 3 and be added required voltage to control each pixel transmission light intensity.Place polaroid 10 in the glass substrate outside.
Three groups of RGBs independently backlight 2 by the red light of arranging according to the order of sequence 11, green light 12,13 3 groups of CCFL fluorescent tubes of blue lamp, reflecting plate 14, diffuser plate 15 is formed.And glow color, fluorescent lifetime and luminous order by driving circuit 3 control backlights.
The thickness of liquid crystal layer is controlled in 4um in the present embodiment, adopts the negative mode that shows of TN liquid crystal, uses the response speed wide temperature liquid crystal material of TN (40 ℃～90 ℃) faster.The frame frequency that shows a color image frame is 70Hz, and the critical temperature of temperature inductor 4 can be provided with at any time, is arranged on 0 ℃ earlier.
When temperature inductor 4 is sensed environment temperature and is higher than 0 ℃ Celsius of critical temperature, control circuit 5 the coloured image of external data base input resolve into three groups of RGBs independently signal and respectively input driving circuit 3 so that show, because the frame frequency of coloured image is 70Hz, the frame frequency time is about 14 milliseconds, if the image of three groups of colors of RGB respectively shows the identical time, about 4.7 milliseconds of each demonstration time, when the backlight of respective color is opened, the pixel that shows respective color also is opened by control seal making alive, when the image of three groups of colors of RGB shows respectively when finishing, the information by human eye will be reduced into the original image of a frame in human brain.Displaying principle so far and former field-sequential mode colour liquid crystal display are basic identical, and displaying principle figure sees Fig. 3.X pixel among the figure refers to any two different pixels in the liquid crystal display cells 1 with the X+1 pixel.
When environment temperature drops to when approaching 0 ℃ of critical temperature, can bright pixel show and feel that display brightness has significant decline, and when this temperature inductor when sensing 0 ℃ of environment temperature subcritical temperature, control circuit 5 is processed into one group of single yellow image signal and input driving circuit 3 to the processing of losing lustre of the coloured image of external data base input.And a demonstration time lengthening and demonstration time two field picture that makes yellow image about 14 milliseconds identical, both in a frame time, had only red and the green colored backlights source with anti-unlatching, the pixel of all images demonstration is simultaneously all opened.The original like this coloured image of seeing becomes single black matrix yellow image, but the display brightness of image is bright more many than the display brightness before 0 ℃ Celsius of critical temperature, even temperature is dropped to-30 ℃, yellow image can show clearly that still result of implementation is seen Fig. 4.The result of variations that shows briliancy is seen Fig. 5.
When environment temperature is returned to more than 0 ℃, display image is returned to original coloured image immediately, again the critical temperature of temperature inductor 4 is arranged on-30 ℃, like this will be before-30 ℃ without the above-mentioned processing of losing lustre, the result is difficult to see clearly between-30～0 ℃ or does not see any image fully and shows.So as long as show condition of poor when suitably critical temperature value being set avoiding low temperature with the temperature characterisitic of liquid crystal material.
Adopt the field order LCD device identical with the 1st embodiment, only revise the control section of control circuit 5, make when temperature inductor 4 when sensing 0 ℃ of environment temperature subcritical temperature, control circuit 5 is the Color Image Processing Cheng Hong of external data base input, blue two groups picture signal and input driving circuit 3.And making redly, the demonstration time of blue two picture group image signals respectively is 7 milliseconds.Promptly in a frame time preceding half section have only red backlight to open, have only blue backlight to open simultaneously in the second half section, and seal adds the voltage of corresponding signal on each pixel, the image three-colo(u)r that the original like this eight color color images of seeing become by red royal purple, and displaying principle figure sees Fig. 6.But the display brightness of image is brighter than the display brightness before 0 ℃ of critical temperature.Even temperature is dropped to-10 ℃, image three-colo(u)r still can clearly show.
Again the critical temperature of temperature inductor 4 is arranged on-10 ℃, like this will be before-10 ℃ without the above-mentioned processing of losing lustre, the result is difficult to see clearly or does not see any image fully and show between-10～0 ℃.So as long as show condition of poor when suitably critical temperature value being set avoiding low temperature with the temperature characterisitic of liquid crystal material.
Adopt the field order LCD device identical with the 1st embodiment, only revise the control section of control circuit 5, make when temperature inductor 4 when sensing 0 ℃ of environment temperature subcritical temperature, control circuit 5 is the demonstration time lengthening to 10 of red image millisecond, the demonstration time of green and blue two picture group image signals respectively is 2 milliseconds, and the voltage that adds corresponding signal at the corresponding time period seal of each pixel, the original like this coloured image of seeing becomes the image that biases toward redness, but the display brightness of image is brighter than the display brightness before 0 ℃ of critical temperature, even temperature is dropped to-10 ℃, image still can clearly show.
Again the critical temperature of temperature inductor 4 is arranged on-10 ℃, like this will be before-10 ℃ without the above-mentioned processing of losing lustre, the result is between-10～0 ℃, be difficult to see clearly or do not see any image fully and show, so as long as show condition of poor when suitably critical temperature value being set avoiding low temperature with the temperature characterisitic of liquid crystal material.
Adopt the field order LCD device identical with the 1st embodiment, only revise the control section of control circuit 5, make when temperature inductor 4 when sensing 0 ℃ of environment temperature subcritical temperature, control circuit 5 only changes frame frequency into 50Hz from 70Hz, the time of every kind of color image demonstration is than the above duration of critical temperature like this, corresponding display brightness is also bright than the display brightness before 0 ℃ of critical temperature, even temperature is dropped to-10 ℃, image still can show.
Again the critical temperature of temperature inductor 4 is arranged on-10 ℃, like this will be before-10 ℃ without above-mentioned processing, the result is between-10～0 ℃, be difficult to see clearly or do not see any image fully and show, so as long as show condition of poor when suitably critical temperature value being set avoiding low temperature with the temperature characterisitic of liquid crystal material.
Claims (1)
1. field-sequential mode colour liquid crystal display, it comprises liquid crystal display cells (1), comprises the independently driving circuit (3) of backlight (2) and above-mentioned liquid crystal display cells of drive and backlight of three groups of RGBs; It is characterized in that: it also includes temperature inductor (4) and correspondent control circuits (5), make this temperature inductor (4) when sensing environment temperature and be higher than predefined certain critical temperature, correspondent control circuits (5) makes the shown two field picture of this liquid crystal display cells (1) be made of the image that three kinds of colors of RGB show respectively; And when this temperature inductor (4) is being sensed environment temperature and is being lower than predefined certain critical temperature, do not change frame frequency, correspondent control circuits (5) makes the shown two field picture of this liquid crystal display cells (1) be mixed the multiple color of forming by three groups of backlights of RGB (2), comprise red, green, blue, yellow, blue or green, purple, the image that one or both colors show respectively in white constitutes, and the demonstration time that will be longer than any one color image in this critical temperature image that three kinds of colors of RGB show respectively when above demonstration time of at least a color image wherein.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100346462A CN100478746C (en) | 2005-05-13 | 2005-05-13 | Field-sequential mode colour liquid crystal display |
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| CNB2005100346462A CN100478746C (en) | 2005-05-13 | 2005-05-13 | Field-sequential mode colour liquid crystal display |
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| CN1862323A CN1862323A (en) | 2006-11-15 |
| CN100478746C true CN100478746C (en) | 2009-04-15 |
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| TWI424416B (en) * | 2009-03-26 | 2014-01-21 | Chunghwa Picture Tubes Ltd | Display apparatus and driving method thereof |
| CN104240619A (en) * | 2013-06-18 | 2014-12-24 | 艾默生过程控制流量技术有限公司 | Display screen, transmitter with display screen and display control method of display screen |
| CN104111552B (en) * | 2014-08-08 | 2017-02-01 | 深圳市华星光电技术有限公司 | Multi-primary-color liquid crystal display and driving method thereof |
| CN115657372A (en) * | 2022-11-04 | 2023-01-31 | 武汉华星光电技术有限公司 | Display device and electronic apparatus |
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Owner name: SHENZHEN SANTECH DISPLAY CO., LTD. Free format text: FORMER OWNER: CHEN GUOPING Effective date: 20100906 |
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Effective date of registration: 20100906 Address after: 518000, 1, Baoan District Second Industrial Park, Longhua, Shenzhen, Guangdong Patentee after: Shenzhen SECCO display Co., Ltd. Address before: 518000 Longhua second Pine Industrial Park, Baoan District, Guangdong, Shenzhen Patentee before: Chen Guoping |
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Granted publication date: 20090415 Termination date: 20140513 |