CN201107514Y - LCD device for improving slant light leakage - Google Patents

Abstract

The utility model discloses an LCD device for improving incline light leakage. The device includes a first base plate and a second base plate that are arranged oppositely as well as a liquid crystal layer filled between the first base plate and the second base plate used for stopping beams from entering into a non-pixel area; the second base plate is formed with a drain beam and a light shielding beam thereof; wherein, a black matrix is also formed with at least one light shielding plate used for blocking incline beams.

Description

Improve the liquid crystal indicator of oblique light leakage

Technical field

The utility model relates to a kind of liquid crystal indicator, particularly relates to a kind of TN type liquid crystal indicator that can improve oblique light leakage.

Background technology

(liquid crystal display is a kind of flat-panel screens that is widely used LCD) to liquid crystal indicator, has low-power consumption, features such as thin external form, light weight and low driving voltage.Liquid crystal indicator generally comprise first substrate, second substrate and be filled in first substrate and second substrate between liquid crystal layer; Viewing area on second substrate comprises a plurality of subpixel area, is provided with thin film transistor (TFT) (TFT) and pixel electrode in it, and thin film transistor (TFT) serves as on-off element; Be formed with common electrode (except the IPS liquid crystal display pattern) on first substrate, be formed with alignment film on the electrode of upper and lower base plate, it is vertical orientated that liquid crystal molecule is obtained.Form electric field between the common electrode of the pixel electrode of second substrate and first substrate, the variation of electric field intensity can be modulated the orientation of liquid crystal molecule, thereby makes backlight realize the variation of transmitance, forms pattern displaying.First substrate also comprises black matrix (BM) with shaded effect and the look resistance layer with translucent effect.

The liquid crystal display pattern that is applied to computer monitor and small size TV aspect at present mainly is TN (Twist Nematic; Twisted nematic) pattern.For TN type liquid crystal indicator, the general stravismus light leak at visual angle up and down that all can take place, Fig. 1 is the principle schematic of existing liquid crystal indicator oblique light leakage, with reference to Fig. 1, liquid crystal indicator comprises first substrate 1 that is oppositely arranged, second substrate 2 and be filled in first substrate 1 and second substrate 2 between liquid crystal layer 3, first substrate 1 is provided with black matrix (BM) 11, define a plurality of sub-pixel area, be used to stop light to enter in the non-pixel region, and cut apart the look resistance layer that continues and make, to increase color contrast, be formed with R in the sub-pixel, G, B look resistance layer 12, the viewing area of second substrate 20 comprises a plurality of subpixel area, is provided with drain electrode line 21 and shading line 22 thereof in the sub-pixel.Owing to the existence of the oblique light in liquid crystal layer 30 (line of band arrow among the figure), after it also reflected by first substrate 10, human eye can be observed in bigger angle, thereby produces light leakage phenomena as can see from Figure 1.The method of its improvement generally has: 1. increase the wide cut of black matrix 11 on first substrate 10, but can reduce aperture opening ratio; 2. the drain electrode shading line of suitable length and width is set, as reduces the spacing of shading line and drain electrode line that drains, but can influence electric field and other distribution of TFT; 3. compensate film with certain phasic difference value is set; be applied to the optical compensating film that forms on the transparent support as the protective film of polaroid as using by the optical anisotropic layer that will comprise dish type (discotic) compound, but can increase its overall cost and can not prevent fully by the light leakage phenomena due to the thermal strain at two A+ up and down that use in the VA type liquid crystal indicator U.S. Pat 2006292372 and A-compensate film with at TN type liquid crystal indicator JP-A-7-191217 and EP-0911656A2.

The utility model content

The technical matters that the utility model solves is to provide a kind of oblique light leakage and liquid crystal indicator simple and reasonable, that need not to increase operation of improving.

Based on above-mentioned purpose, the utility model provides a kind of liquid crystal indicator that improves oblique light leakage, comprises first substrate, second substrate that are oppositely arranged; And be filled in liquid crystal layer between first substrate and second substrate; Be formed with black matrix on described first substrate; Be formed with drain line and shading line thereof on described second substrate; Also be formed with at least one shadow shield on the wherein said black matrix.

Described shadow shield seemingly meets following condition to the sub-pixel open region apart from d2 and shadow shield height h close:

$\frac{d2}{h}=d1*\tan \left(\mathrm{\φ}\right)$

Wherein d1 is the distance of the drain electrode shading line outside to the sub-pixel open region; φ is the angle of oblique light and normal.

Based on above-mentioned design, the liquid crystal indicator that improves oblique light leakage that the utility model provides is owing to be provided with the shadow shield of certain altitude on black matrix, can block oblique light, can't propagate into human eye, thereby reach the effect of improving oblique light leakage, liquid crystal indicator with this shadow shield structure can not reduce aperture opening ratio, the size that d2 rationally is set also can increase aperture opening ratio, and only need column bedding and padding (PS on first substrate, Photo Spacer) its reticle mask plate (Mask) figure of change gets final product in the processing procedure, need not to increase processing procedure and operation, do not increase cost.

In order to illustrate further feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing.Wherein the only for reference and aid illustration usefulness of accompanying drawing does not constitute restriction of the present utility model.

Description of drawings

Fig. 1 is the principle schematic of available liquid crystal display device oblique light leakage;

Fig. 2 is the structural representation of sub-pixel among the utility model one embodiment;

Fig. 3 is the structural representation of sub-pixel among another embodiment of the utility model;

Fig. 4 is the following view of first substrate among Fig. 2.

Among the figure:

10. first substrate 11. is deceived matrix 12. look resistance layers 111. shadow shields

20. second substrate, 21. drain electrode lines, 22. shading lines

30. liquid crystal layer 40. backlights

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and exemplary embodiments.

Fig. 2 is the structural representation of the sub-pixel among the utility model embodiment one, and Fig. 4 is the following view of first substrate among Fig. 2.

With reference to Fig. 2, the liquid crystal indicator that improves oblique light leakage of Fig. 4 comprises first substrate 10 that is oppositely arranged, second substrate 20, and be filled in liquid crystal layer 30 between first substrate 10 and second substrate 20, be formed with on first substrate 10 and be used to stop light to enter the interior black matrix (BM) 11 of non-pixel region, black matrix 11 defines a plurality of sub-pixel area, in order to cut apart the look resistance layer that continues and make, to increase color contrast, be formed with red (R) in the sub-pixel area, green (G), blue (B) three kinds of look resistance layers 12, black matrix 14 is made by crome metal (Cr) usually, in order to reduce surface reflection, also available chromium oxide (CrOx) or black photosensitive resin are made.

Be formed with drain electrode line 21 and drain electrode shading line 22 on second substrate 20.The below of second substrate 20 is provided with backlight 40, is used for providing light source to display panel.Also can make column bedding and padding (PS) (not illustrating among the figure) on first substrate 10, be used to keep LCD device and keep normal box thick by exposure.

Respectively make the not shared same shadow shield of 111, two adjacent subpixels of a shadow shield on the black matrix 11 of sub-pixel both sides, promptly each black matrix 11 is provided with two shadow shields 111.Be formed with the shadow shield 111 with certain altitude h on the black matrix 11 at distance sub-pixel open region d2 place, oblique light is blocked, d1 is the distances of drain electrode shading line 22 outsides to the sub-pixel open region; θ prevents the angle of eye-observation to light leak in advance; φ roughly can estimate with following formula for the angle of oblique light and normal when human eye is observed under the θ angle and the relation of θ:

N wherein _LCIt is the liquid crystal layer mean refractive index;

Wherein there is following approximation relation between d1, d2 and the h:

$\frac{d2}{h}=d1*\tan \left(\mathrm{\φ}\right).$

Size that can be by d2 rationally is set is bad to avoid producing orientation, then according to the value of the size design shadow shield height h of d2, but must satisfy the height of shadow shield height h less than column pad P S; And all right further width of optimal design d2 on the basis of satisfying the condition that prevents oblique light leakage is to reach the effect that increases aperture opening ratio simultaneously.It is to carry out synchronously that the manufacturing process of shadow shield 111 can be carried out the PS photoetching at first substrate 10, need not increase processing procedure.

Use software to simulate according to this structure, can obtain to draw a conclusion: the bright attitude of the liquid crystal indicator of the utility model example structure descends 0.2% slightly than the liquid crystal indicator of existing structure, and influence is little; It is obvious that but its dark attitude is improved effect, the decline 11.1% before the ratio after the improvement improves, thus improved contrast and visual angle more significantly.

Fig. 3 is the structural representation of the sub-pixel of another embodiment of the utility model; Different with the foregoing description is the shared same shadow shields 111 of described two adjacent subpixels, promptly on each black matrix 11 shadow shield 111 is set, and is used to block oblique light.

Claims (4)

1. a liquid crystal indicator that improves oblique light leakage comprises

First substrate that is oppositely arranged, second substrate; And

Be filled in the liquid crystal layer between first substrate and second substrate;

Be formed with black matrix on described first substrate;

Be formed with drain electrode line and shading line thereof on described second substrate;

It is characterized in that also being formed with at least one shadow shield on the described black matrix.

2. liquid crystal indicator according to claim 1 is characterized in that being formed with two shadow shields on the black matrix of described each sub-pixel both sides.

3. liquid crystal indicator according to claim 1 is characterized in that the shared shadow shield of described two adjacent sub-pixels.

4. according to claim 2 or 3 described liquid crystal indicators, it is characterized in that described shadow shield seemingly meets following condition to the sub-pixel open region apart from d2 and shadow shield height h close:

$\frac{d2}{h}=d1*\tan \left(\mathrm{\φ}\right)$

Wherein d1 is the distance of the drain electrode shading line outside to the sub-pixel open region; φ is the angle of oblique light and normal.

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