CN101373290B

CN101373290B - LCD device

Info

Publication number: CN101373290B
Application number: CN2007100765465A
Authority: CN
Inventors: 姚绍民; 李铁; 李宁
Original assignee: BYD Co Ltd
Current assignee: Shenzhen Holitech Optoelectronics Co Ltd
Priority date: 2007-08-22
Filing date: 2007-08-22
Publication date: 2010-06-16
Anticipated expiration: 2027-08-22
Also published as: CN101373290A

Abstract

The invention discloses an LCD (liquid-crystal display) including an upper glass base plate, an upper transparent conductive thin film, a TOP insulating and protecting layer, a color filtering film and a lower glass base plate. The lower surface of the upper glass base plate is coated with the upper transparent conductive thin film; the transparent conductive thin film is coated with the TOP insulating and protecting layer; the lower surface of the upper glass base plate is coated with the insulating and protecting layer; the upper surface of the lower glass base plate is coated with the color filtering film including a black matrix and red, green and blue sub-pixels, wherein the black matrix is distributed at the periphery and between the adjacent red, green and blue sub-pixels; and the height difference between the black matrix distributed at the periphery and the red, green and blue sub-pixels is smaller than 0.05 microns. The height difference between the black matrix distributed at the periphery and the red, green and blue sub-pixels is reduced, so that the deformation of the LCD in hot pressing is reduced, the phenomenon of cell thickness badness thereof is reduced, and the local display badness expressed by the cell thickness quality is difficult to perceive by eyes.

Description

A kind of LCD

Technical field

The present invention relates to the structure of LCD.

Background technology

Universal day by day along with lcd products, liquid crystal display device has become the basic device that occupies critical role in information and the electronics industry, LCD has developed into a huge industry, wherein, colorful ultra-twist nematic phase (Color Super Twisted Nematic, be called for short CSTN) be to have added that by supertwist nematic phase (Super Twisted Nematic is called for short STN) structure the structure of color filter film realizes colored the demonstration.Be widely used in fields such as mobile phone, MP3/MP4, wireless phone, game machine, electronic dictionary, instrument and meter.

At present, in the manufacturing process of CSTN LCD, occur the even phenomenon of box thickness ununiformity easily, can influence the display effect of display.At the phenomenon of box thickness ununiformity, provide following check and analysis determination methods: adopt the RETS-1100 box thick/the thickness tester, the real box data of test LCD panel adopt 25 methods, test point is selected in that black surround BM inside keeps to the side to get a little and the centre, as shown in Figure 1.Test and set the thick tester parameter of box before the real box, as the ne value of liquid crystal and no value, PI tilt angle, rubbing angle etc.

Wherein, Δ n (liquid crystal birefringence rate)=ne (directional light)-no (vertical light), the root condition that rubs of the affects rotation effect of its difference; Near interfacial liquid crystal molecule is not to be parallel to dividing surface fully, but shape has a certain degree, and this angle just is called pre-hectare of angle, and it affects the threshold property acuity of LCD and vision etc.; The angle of rubbing angle decision liquid crystal molecule on the PI layer arranged, and it influences the LCD display effect.

The thick criterion of box inner box, as following table:

Press the thick classification of product box	Criterion	Standard deviation δ ²⁵
Press the thick classification of product box	Criterion	Standard deviation δ ²⁵	5.0μm STN	4.80 ± 0.10um (real box)	≤0.018
5.5μm STN	5.40 ± 0.20um (real box)	≤0.018	5.0μm STN	4.80 ± 0.10um (real box)	≤0.018

30

When the box thick (box spacing extreme difference) of product value is above greater than 0.05um, the color relation of its emergent light can change to some extent, usually judge the thick quality situation of box of product according to a preliminary estimate with human eye, if the box of LCD is thick deviation is arranged, for example: 0.05um, change color (wavelength variations 10nm＞human eye sensitivity) will take place in emergent light, and human eye will be experienced the demonstration bad phenomenon, as shinny, local bulk obfuscation in part etc.

Existing electrical measurement post is lighted with non-illuminating state according to the limit sample sample comparison of formulating and is confirmed that (illuminating state is: the state that voltage effect LCD opens liquid crystal molecule rotation light path; The bright state of non-electricity is: no-voltage effect liquid crystal molecule can't rotate the light path closing state).The difference of testing actual Δ n*d for≤10nm is a non-defective unit, wherein, Δ n*d value is the root condition that rubs that makes LCD box generation rotation effect, Δ n: liquid crystal birefringence rate, d: the thick value of box, the thick 5.5um that generally is given as of CSTN product box, perhaps still because of processing procedure difference, the thick value of its true box is different for 5.0um..

When display box webbing frame is thin partially, under driven,, be positioned at the easier distortion rotation of liquid crystal molecule at this place, so the frame of display is higher than other local display brightness because the ground square box spacing that product approaches partially is less than normal.When LCD local thickness is inhomogeneous, under power drives, can present local darker situation.

Wherein, the structure of LCD before hot pressing as shown in Figure 2, the structure after the hot pressing is as shown in Figure 3.Hot pressing fits together two glass that do not have a direct relation tightly and forms the LCD box, except main glass deformation, all deformation can take place at High Temperature High Pressure lower frame glue, box liner bedding and padding under hot pressing.Near the LCD frame distortion is bigger as shown in Figure 3, because being the marginal distribution of a lot of parts, frame region concentrates ground, its box spacing is restricted by several factors, such as the structure of color filter film, TOP layer area coverage, the deformation under hot pressing function of glue frame etc., will make the LCD box be difficult for deformation and reach the thick purpose of control enclosure at the effect lower frame near zone of external force if can improve this regional flatness.As Fig. 4, shown in Figure 5; TOP layer 1 is one deck insulating protective layer; because its insulativity; so need empty design at transfer printing conductiving point 3 places in the prior art; and the coverage rate that makes TOP layer 1 forms the breach 11 that bends inwards, and also the glue frame 2 that therefore causes being supported on the TOP layer 1 produces difference in this regional flatness.

As shown in Figure 6, from the manufacture craft of the color film glass of CF, the height of the black matrix" BM of color filter film all is the height that is lower than the RGB sub-pixel generally speaking.On technology, in the color filter film, the black matrix" BM at edge and the difference in height of RGB sub-pixel are difficult to control, also have highly uneven phenomenon in the centre.

Table one is to the test data of black matrix" (Black Matrix abbreviates BM as) on a plurality of test points in color filter film edge place in the existing LCD with RGB (RGB) sub-pixel difference in height and flatness.Wherein, the R-BM frame is the difference in height of R and the BM around it, is reference point with BM.G-R and B-R are respectively to be the difference in height that reference point records with R.When difference in height surpassed 0.05 micron, its color relation by the LCD outgoing can change to some extent.Difference in height at black matrix" BM of edge and red, green, blue sub-pixel is bigger as can be seen from Table I, when therefore LCD being carried out hot-pressing processing, occurs bigger deformation easily.

Table one

Summary of the invention

Technical matters to be solved by this invention is the shortcoming that overcomes prior art, provides a kind of box thick uniform LCD.

In order to solve this technical matters, the present invention proposes a kind of LCD, comprise top glass substrate, go up transparent conductive film, TOP insulating protective layer, color filter film, lower glass substrate; The described transparent conductive film of going up covers in described top glass substrate lower surface, and described TOP insulating protective layer covers on described transparent conductive film; Described color filter film is covered in described lower glass substrate upper surface, and described color filter film comprises black matrix" and red, green, blue sub-pixel, and described black matrix" is distributed between edge and each the adjacent red, green, blue sub-pixel; The difference in height of described black matrix" that is positioned at the edge and red, green, blue sub-pixel is less than 0.05 micron; Described TOP insulating protective layer coverage rate integral body is rule, symmetrical square.

Above-mentioned LCD, described between each adjacent red, green, blue sub-pixel the difference in height of black matrix" and red, green, blue sub-pixel less than 0.05 micron.

Above-mentioned LCD, described TOP insulating protective layer also can be for coverage rate integral body be rule, symmetrical square, and these square four jiaos are arc angling.

Adopt LCD of the present invention,, make that the distortion when LCD is subjected to hot pressing reduces owing to reduced the difference in height of black matrix" and red, green, blue sub-pixel.

The breach that insulating protective layer contracts in existing in the prior art causes the flatness of glue frame Support Position difference to occur, and stressed back box is thick to be produced bad in this position thereby make; The present invention is by changing the shape of insulating protective layer TOP layer, make it enclose the square of rule according to the glue frame, because no longer there is breach in the TOP layer, so it is uniform that the glue frame contacts with the face of TOP layer, the flatness of whole glue frame Support Position can not produce difference thus, has avoided causing local box thick bad; Further improve the flatness of LCD, thereby improved the performance of LCD.

Description of drawings

The real box test synoptic diagram of Fig. 1 liquid crystal panel

Fig. 2 is the structural representation before the LCD hot pressing;

Fig. 3 is the structural representation after the LCD hot pressing;

Fig. 4 covers the product synoptic diagram after the printing of prior art TOP insulating protective layer;

Fig. 5 is the design diagram of prior art TOP insulating protective layer galley;

Fig. 6 is the structural representation of prior art color filter film;

Fig. 7 is the structural representation of the CSTN LCD of the embodiment of the invention;

Fig. 8 is the design diagram of the TOP insulating protective layer galley of the embodiment of the invention;

Fig. 9 is the structural representation of the color filter film of the embodiment of the invention;

Figure 10 is the thick measurement transition diagram of the box of prior art;

Figure 11 is the thick measurement transition diagram of the box of the embodiment of the invention;

Figure 12 is the thick uniformity coefficient synoptic diagram of the box of the prior art and the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further illustrated.

Fig. 7 is the structural representation of this routine CSTN LCD, comprises top glass substrate 10, last transparent conductive film 20, TOP insulating protective layer 30, PI oriented layer 40, liquid crystal layer 50, following transparent conductive film 60, insulation course 70, color filter film 80, lower glass substrate 90.Seal with glue frame 100 around the liquid crystal 50, color filter film 80 comprises red sub-pixel 801, green sub-pixels 802, blue subpixels 803 and black matrix" 804, and black matrix" 804 is reaching between red sub-pixel 801, blue subpixels 802, the green sub-pixels 803 around the color filter film.

As shown in Figure 8.TOP bending design causes frame glue thickness distribution inequality, therefore, and in this example, TOP layer 30 coverage rate are designed to the square of rule, no longer there is the breach that bends inwards in edge 301, and on technology, the half tone frame line design load 0.26mm～0.30mm that is used to form glue frame 100 is advisable.After hot pressing, 100 deformation of glue frame have face to contact with TOP layer 30, because no longer there is breach in TOP layer 30, are uniformly so glue frame 100 contacts with the face of TOP layer 30, can not cause local box thick bad.

As shown in Figure 9, for BM design in the color filter film, the BM of edge is increased in this example, the section of BM and RGB is differed from less than 0.05um.Further the BM between each red sub-pixel 801, blue subpixels 802, green sub-pixels 803 is increased, the section difference that makes BM and RGB is less than 0.05um.

According to the test condition of following table, carried out fail-test with the two LCD products that adopt the technical solution of the present invention front and back respectively.

Pilot project	Test condition
Pilot project	Test condition	Thermophilic digestion	120℃、1.2～2.0ATM、100％RH、8H
Constant temperature and humidity	60℃、90％RH、8H	Thermophilic digestion	120℃、1.2～2.0ATM、100％RH、8H
Constant temperature and humidity	60℃、90％RH、8H	Cryopreservation	Temperature :-40 ℃; Preserve 24H

Please in conjunction with the thick test data of box before and after the improvement of Figure 10, Figure 11, shown in Figure 12 and following table, thick being well controlled of box that technical scheme of the present invention as can be known makes the CSTN LCD.Wherein, Figure 10, Figure 11 can significantly find out that from Figure 10 the thick value span of product box is very big for the thick measurement transition diagram of box (S1 → S10 is promptly from glass leads ends → sealing end) before and after improving, and extreme difference R reaches 22nm; Contrast Figure 11, the thick transition of box is mild, and extreme difference is controlled at 8nm with interior (susceptibility of human eye is approximately 10nm), and box is thick to have obtained good improvement control.Figure 12 is casing figure, shows to improve the thick flatness contrast of front and back box, and the flat more product that shows of casing is smooth more.

Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims

1. a LCD comprises top glass substrate, goes up transparent conductive film, TOP insulating protective layer, color filter film, lower glass substrate; The described transparent conductive film of going up covers in described top glass substrate lower surface, and described TOP insulating protective layer covers on described transparent conductive film; Described color filter film is covered in described lower glass substrate upper surface, and described color filter film comprises black matrix" and red, green, blue sub-pixel, and described black matrix" is distributed between edge and each the adjacent red, green, blue sub-pixel; It is characterized in that: the difference in height of described black matrix" that is positioned at the edge and red, green, blue sub-pixel is less than 0.05 micron; Described TOP insulating protective layer coverage rate integral body is rule, symmetrical square.

2. LCD according to claim 1 is characterized in that: described between each adjacent red, green, blue sub-pixel the difference in height of black matrix" and red, green, blue sub-pixel less than 0.05 micron.

3. LCD according to claim 1 and 2 is characterized in that: described TOP insulating protective layer coverage rate is whole to be rule, symmetrical square, and these square four jiaos are arc angling.