CN103035217A - Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight - Google Patents

Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight Download PDF

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Publication number
CN103035217A
CN103035217A CN2012103909040A CN201210390904A CN103035217A CN 103035217 A CN103035217 A CN 103035217A CN 2012103909040 A CN2012103909040 A CN 2012103909040A CN 201210390904 A CN201210390904 A CN 201210390904A CN 103035217 A CN103035217 A CN 103035217A
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CN
China
Prior art keywords
led
light
scan mode
liquid crystal
mode
Prior art date
Application number
CN2012103909040A
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Chinese (zh)
Inventor
吴小平
周伟裕
罗天珍
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吴小平
周伟裕
罗天珍
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Priority to CN201120396019.4 priority Critical
Priority to CN201120396019 priority
Application filed by 吴小平, 周伟裕, 罗天珍 filed Critical 吴小平
Priority to CN2012103909040A priority patent/CN103035217A/en
Publication of CN103035217A publication Critical patent/CN103035217A/en

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Abstract

Provided is a liquid crystal display panel of a scanning type side light supplying Light-Emitting Diode (LED) backlight. When a plurality of LED light pipes which is arranged on the sidelight LED light source strips emit light in a scanning form, convergence process is conducted on a unidirection of the LED light source, and a scanning light strip is produced. The light strip can be in a stable and constant mode or a changeable mode, just misses an ascending and descending time range of a liquid crystal response, overcomes image trailing and worsening of contrast ratio and vision resolution ratio of a dynamic image, and the image trailing and worsening of contrast ratio and vision resolution ratio of a dynamic image are caused by relatively big residue of a liquid crystal image. Therefore, picture quality in high frequency portion is improved and the image trailing is thoroughly eliminated. The liquid crystal display panel of a scanning type side light supplying LED backlight is widely applied to a liquid crystal displayer.

Description

A kind of scan-type side is for the display panels of light LDE backlight

The invention belongs to electronic technology field: say definitely be a kind of with side for light formula backlight and in conjunction with the scanning work mode liquid crystal panel.

The present state of the art:

LCD TV belongs to inadequate natural endowment for the conditions of streaking of moving image, each massive plate TV manufacturer is all trying to explore effective solution route both at home and abroad, successively take various technical measures, for example be devoted to shorten the black and white response time in 2004-2005; Turn to GTG " overclocking " in 2005-2006, and with overdrive technique GTG was down to 4ms, 2ms, even 1ms; Rise 100/120Hz technology+MEMC technology in 2007 thereupon, effectively improved actual dynamic definition.So-called 100Hz/120Hz technology is exactly a technology of television image signal being carried out the frequency multiplication interleave in fact, is about to former 50-60Hz field frequency and changes into 120Hz.Concrete measure can be " inserting the field " technical approach, also can realize with the technical approach of " inserting frequently ".The former is black or the ash field of inserting in the picture of original image without image, to increase field frequency, and the latter is the correlativity according to picture scene content and front and back image, choosing relating dot carries out dynamic point-to-point pixel and estimates, regenerate the more accurate intelligent picture of a width of cloth brightness, contrast and continuity, between the image, field frequency is doubled before and after injecting.The 100Hz/120Hz technology is corresponding PAL/NTSC standard field frequency respectively.Field frequency (VerticalScanning Frequency) is called again " vertical scanning frequency ", refers to the number of times of screen-refresh p.s., and unit is Hz.Television system in the global range mainly contains PAL, NTSC and this three major types of SECAM at present, wherein pal mode is the radio and television standard system in China and Europe, the television format signal of standard is per second 25 frame pictures, every frame picture divides 2 field scans by televisor according to odd-numbered line and even number line, therefore televisor will be at 1 interscan in second, 50 field picture, i.e. 50Hz.In the TSC-system formula, TV signal has then comprised the picture of per second 30 frames, and televisor is according to 60 of per seconds, and namely the frequency of 60Hz is carried out image restoring.Realize real 100/120Hz technology, need to start with from soft, hard two indexs.In 100/120Hz technical development process, the technology such as simple doubly field, black plug field, Plug Grey field, dynamic GAMMA appearred once.Strictly speaking, these technology all can not well be improved motion blur, more fail to solve problem of motion judder.The 100/120Hz technology of now domestic and international many producers application, simultaneously prestowage the 120Hz liquid crystal display, the ME/MC chip circuit, by a series of accurate computings, intelligence generates excessive frame, and the 50Hz refresh rate of LCD TV is promoted to 100Hz, or the refresh rate of 60Hz is promoted to 120Hz, thereby effectively improved ghost, hangover when motion picture is play, basically can reach the result of broadcast of clear and smooth, but compare effect apart from still larger with PDP.

Purpose of the present invention:

Under the condition that does not increase cost: reach and to compare dynamic display effect without hangover with CRT and PDP, and local image quality is better.

Characteristics of the present invention:

Need not too rely on the response speed and the overshoot that improve liquid crystal material and drive liquid crystal light valve, do not sacrifice other aspects of image quality, only utilize the characteristic that reaches fast the high density strobe light emission of led light source, eliminate the smearing of motion video fully, improve simultaneously the high frequency partial image quality.

Many LED light pipes on the side view LED light source strip are namely luminous with the scanning form: and with the unidirectional convergence processing of led light source, can generate the scanning light belt, this light belt namely can be that the steady pattern also can be changing pattern, and can just miss liquid crystal response rising and fall time section, overcome the larger residual of liquid crystal image and cause streaking and worsen contrast and the vision addressability of the thin section of dynamic image; Thereby improved the image quality of HFS and thoroughly eradicated streaking; Can be widely used in the liquid crystal display, present technique be a kind of with side for light formula backlight and in conjunction with the scanning work mode liquid crystal panel.

Key problem in technology of the present invention just is:

This scan-type side is comprised of for photo structure, liquid-crystalline glasses composite component, housing, pixel driver plate, LED drive plate and light guide plate etc. the side-light type led light source for the display panels of light LDE backlight.

Basic functional principle: needing the led light source in the LED-backlit bar is unidirectional convergence, for reaching the convergence purpose: the envelope shape of led chip can be that planar package also can be sphere or aspheric encapsulation, the angle that makes LED bright dipping angle of divergence in the plane vertical with backlight plate is larger, and along with backlight plate namely: the angle of divergence is less in the parallel plane of light guide plate, and the light belt that many like this led chips form will can not diffuse into larger width; Comprise: successively scan mode or the scan mode of creeping; When LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping, backlight will produce the luminous zone that the scanning consistent with auspicious frequency is moved, if long side confession light mode, luminous zone will be that horizontal light belt vertical direction moves; If short brink supplies the light mode, luminous zone will be that the vertical band horizontal direction moves; The orientation of light belt and mobile direction will cooperate the mode that refreshes of liquid crystal pixel.Row refreshes mode with hydrous water zero diopter band, and row refresh mode and will cooperate vertical band; Because the response of liquid crystal needs the regular hour, when liquid crystal pixel refreshes line by line, needs at least several milliseconds time to respond, liquid crystal is in transient state before finishing target response; Thereby the reference position of light belt will with just drive the existing row refresh at voltage certain distance be arranged: i.e. between-line spacing; The corresponding line number of the width of light belt can be 1/2 to 1/30 of total line number; LED-backlit source bar namely can be that the steady pattern also can be changing pattern with the pattern of successively scan mode or the scan mode work of creeping; Particularly: the speed of scanning both can be at the uniform velocity also can be speed change; The width of light belt namely can be constant also can changing, the drive current for LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping can be identical line by line also can be different; Thereby during the liquid crystal pixel face that refreshed when light belt is inswept, liquid crystal pixel has been finished target response, enters the steady state (SS) that rises and descend and finish; New auspicious image will be without front auspicious residual and this auspicious underactuated part; Keep less hangover and dynamic image to blur.

Its essential characteristic is: the unidirectional convergence of the side-light type led light source of display panels; The LED-backlit bar is with scan mode work, comprising: successively scan mode or the scan mode of creeping; And the mode of operation of scan mode or the scan mode of creeping namely can be that the steady pattern also can be changing pattern successively: specifically come, scan mode is that LED is divided into many groups successively, lights successively for every group, and is luminous in turn; The scan mode of creeping is to light the initial set of LED in advance, then lights a small amount of LED pipe that closes on leading portion when knocking out a small amount of LED lamp of initial set back segment; The center section LED lamp of initial set keeps illuminating state, repeats successively.

Referring to of the unidirectional convergence of the led light source in the display panels: the envelope shape of each led chip can be that planar package also can be sphere or aspheric encapsulation; Planar package refers to encapsulate to obtain little shooting angle with high index of refraction; Also can be sphere or aspheric encapsulation; For aspheric situation, non-spherical surface by with the mean curvature of backlight formed curve that parallel plane plane is cut greater than this non-spherical surface by the mean curvature value of plane the cut formed curve vertical with the backlight plane.

The steady pattern of the mode of operation of described scan mode or changing pattern only be: the speed of scanning both can be at the uniform velocity also can be speed change; The width of light belt namely can be constant also can changing, the drive current for LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping can be identical line by line also can be different.

Replenish: the light that led light source sends passes liquid-crystalline glasses composite component or liquid crystal light valve sheet, the system that is comprised of power panel, drive plate, mainboard etc. generates the driving signal, drive liquid-crystalline glasses composite component or liquid crystal light valve sheet, modulate each pixel through the power of light, form image by the scattering of liquid-crystalline glasses composite component or with the liquid crystal light valve sheet by the camera lens projection again; Because the response time of liquid crystal compares slowly with CRT and PDP, the hangover of motion video results from the slow response time, when led light source with impulse form luminous and be synchronized with the image auspicious frequency the time, the luminous window of LED just miss liquid crystal response rising and fall time section, this time period also is the excessive phase of switching, brightness is by turning in vain black or turning the white time period by deceiving, to so that supply under the light in the full time period of light source just because of this time period, image has larger residual, causes streaking; On the other hand: the long image quality that will directly affect the HFS of image of the response time of liquid crystal; Image has larger residual contrast and the vision addressability that will worsen the thin section of dynamic image.

With regard to basic embodiment of the present invention, the invention will be further described below in conjunction with accompanying drawing:

Fig. 1 scan-type side is for the display panels organigram of light LDE backlight

Scanning light belt synoptic diagram in Fig. 2 backlight guide plate

Illustrate:

(1) led light source is for striation (side is for light)

(2) light guide plate

(3) non-spherical lens

(4) liquid-crystalline glasses composite component

(5) housing

(6) pixel driver plate

(7) composition such as LED drive plate

(8) LED scanning group

(9) scanning light belt

(10) scanning light belt

As shown in Figure 1:

This figure is the universal architecture of such liquid crystal panel; Be clear expression structure thought; This insignificant structure member not shown in FIG., and express with the isolation of components state.

Led light source is the linear alignment by the plurality of LEDs chip for striation (side is for light) (1), quantitatively can be monolateral/bilateral/three limits/quad type; Mode shown in this figure is two minor face modes.Non-spherical lens (3) so that light along larger with the angle of the vertical direction expansion of the light guiding surface (upper and lower surface) of light guide plate (2); And along less with the angle of the parallel direction expansion of the light guiding surface (upper and lower surface) of light guide plate (2); When backlight supplies striation (side is for light) when (1) is in the scanning work state (only some led chip that faces mutually each other is simultaneously luminous, and order is rotated); Because institute's isolychn, will can not cause scanning light belt expansion wide of light guide plate (2) along less with the angle of the parallel direction expansion of the light guiding surface (upper and lower surface) of light guide plate (2).

(4) be the liquid-crystalline glasses composite component, (5) are housing, and (6) are the pixel driver plates, and (7) are the LED drive plates.

As shown in Figure 2:

(8) be the LED scanning group, in the scanning work mode, only some is lit led light source simultaneously for the led chip in the striation (1), and successively displacement shows as the LED scanning group in crawling exercises; To produce in the light guide plate (2) 2 stacks to luminous zone: scanning light belt 1 (9) and scanning light belt 2 (10); The effect of non-spherical lens (3) is that dispersing to some extent of light reduced, and is unlikely to make beam spread wide.

Claims (4)

1. a scan-type side is for the display panels of light LDE backlight; This display panels is comprised of for photo structure, liquid-crystalline glasses composite component, housing, pixel driver plate, LED drive plate and light guide plate etc. the side-light type led light source; Basic functional principle: the led light source in the LED-backlit bar need to be unidirectional convergence, for reaching the convergence purpose: the envelope shape of led chip can be that planar package also can be sphere or aspheric encapsulation, the angle that makes the LED bright dipping along with backlight plate namely: the angle of divergence is larger in the vertical plane of light guide plate, and the angle of divergence is less in the plane parallel with backlight plate, and the light belt that many like this led chips form will can not diffuse into larger width; Comprise: successively scan mode or the scan mode of creeping; When LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping, backlight will produce the luminous zone that the scanning consistent with auspicious frequency is moved, if long side confession light mode, luminous zone will be that horizontal light belt vertical direction moves; If short brink supplies the light mode, luminous zone will be that the vertical band horizontal direction moves; The orientation of light belt and mobile direction will cooperate the mode that refreshes of liquid crystal pixel.Row refreshes mode with hydrous water zero diopter band, and row refresh mode and will cooperate vertical band; Because the response of liquid crystal needs the regular hour, when liquid crystal pixel refreshes line by line, needs at least several milliseconds time to respond, liquid crystal is in transient state before finishing target response; Thereby the reference position of light belt will with just drive the existing row refresh at voltage certain distance be arranged: i.e. between-line spacing; The corresponding line number of the width of light belt can be 1/2 to 1/30 of total line number; LED-backlit source bar namely can be that the steady pattern also can be changing pattern with the pattern of successively scan mode or the scan mode work of creeping; Particularly: the speed of scanning both can be at the uniform velocity also can be speed change; The width of light belt namely can be constant also can changing, the drive current for LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping can be identical line by line also can be different; Thereby during the liquid crystal pixel face that refreshed when light belt is inswept, liquid crystal pixel has been finished target response, enters the steady state (SS) that rises and descend and finish; New auspicious image will be without front auspicious residual and this auspicious underactuated part; Keep less hangover and dynamic image to blur; Its feature just is: the unidirectional convergence of the side-light type led light source of display panels; The LED-backlit bar is with scan mode work, comprising: successively scan mode or the scan mode of creeping; And the mode of operation of scan mode or the scan mode of creeping namely can be that the steady pattern also can be changing pattern successively.
2. referring to such as the unidirectional convergence of the led light source in claim 1 display panels: the envelope shape of each led chip can be that planar package also can be sphere or aspheric encapsulation; Planar package refers to encapsulate to obtain little shooting angle with high index of refraction; Also can be sphere or aspheric encapsulation; For aspheric situation, non-spherical surface by with the mean curvature of backlight formed curve that parallel plane plane is cut greater than this non-spherical surface by the mean curvature value of plane the cut formed curve vertical with the backlight plane.
3. refer to such as claim 1 display panels successively scan mode or the scan mode of creeping: scan mode is that LED is divided into many groups successively, lights successively for every group, and is luminous in turn; The scan mode of creeping is to light the initial set of LED in advance, then lights a small amount of LED pipe that closes on leading portion when knocking out a small amount of LED lamp of initial set back segment; The center section LED lamp of initial set keeps illuminating state, repeats successively.
As the steady pattern of the mode of operation of the described scan mode of claim 1 display panels or changing pattern only be: the speed of scanning both can be at the uniform velocity also can be speed change; The width of light belt namely can be constant also can changing, the drive current for LED-backlit source bar during with the work of successively scan mode or the scan mode of creeping can be identical line by line also can be different.
CN2012103909040A 2011-10-10 2012-09-28 Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight CN103035217A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201120396019.4 2011-10-10
CN201120396019 2011-10-10
CN2012103909040A CN103035217A (en) 2011-10-10 2012-09-28 Liquid crystal display panel of scanning type side light supplying Light-Emitting Diode (LED) backlight

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CN104167184A (en) * 2014-08-28 2014-11-26 郑州瑞合信电子科技有限公司 Method for automatically identifying scanning mode of LED unit plate and LED control card
CN108694914A (en) * 2018-07-30 2018-10-23 京东方科技集团股份有限公司 Backlight drive method and its device, readable storage medium storing program for executing and backlight

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CN104167184A (en) * 2014-08-28 2014-11-26 郑州瑞合信电子科技有限公司 Method for automatically identifying scanning mode of LED unit plate and LED control card
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CN108694914A (en) * 2018-07-30 2018-10-23 京东方科技集团股份有限公司 Backlight drive method and its device, readable storage medium storing program for executing and backlight

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