CN201060351Y - LCD device of multi-domain vertical orientation mode - Google Patents

Abstract

The utility model discloses a liquid crystal display device with a multi-domain vertical orientation mode, comprising an upper baseplate, a lower baseplate, and a liquid crystal layer filled between the upper and lower baseplates. A common electrode is formed on the upper baseplate surface, and a slit or a heave is formed on the common electrode. A display area of the lower baseplate contains a plurality of sub-pixel areas, and a pixel electrode is arranged in a sub-pixel. The slit or the heave is formed on the pixel electrode; wherein, the sub-pixels are divided into at least two areas with a certain area ratio, and the gaps between the common electrode and the pixel electrode in at least two areas are not the same to each other.

Description

The liquid crystal indicator of multi-domain vertical orientation mode

Technical field

The utility model relates to a kind of liquid crystal indicator, particularly relates to a kind of liquid crystal indicator that can improve the multi-domain vertical orientation mode of aberration.

Background technology

(Liquid Crystal Display is one of the main flow display technique of present widespread use LCD), feature such as have that power consumption is little, thin thickness, in light weight and operating voltage are low in liquid crystal display.Display panels generally comprises upper substrate, infrabasal plate and is filled in liquid crystal layer between the upper and lower base plate; Viewing area on the infrabasal plate 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; Upper substrate has common electrode (except the IPS liquid crystal display pattern) and coloured filter; On the electrode of upper and lower base plate, have alignment film material, make liquid crystal molecule obtain orientation; Form electric field between the pixel electrode of infrabasal plate and the common electrode of upper substrate, under effect of electric field, the ordered state of liquid crystal molecule changes, thereby the transmitance of backlight is changed, and forms pattern displaying.

The liquid crystal display pattern that is applied to the TV aspect at present is mainly MVA (Multi-domainVertical Alignment; Multi-domain vertical alignment) pattern.The MVA liquid crystal display mostly is and utilizes protrusion or gap electrode to form the multi-domain vertical alignment display mode, to utilize protrusion to form the MVA display mode is example, under the situation that does not have electric field to exist, liquid crystal molecule is vertical orientated under the effect of alignment film, shown in Figure 1A, this moment, display had good black attitude.Liquid crystal molecule is applied certain voltage, and liquid crystal is turned to gradually by the homeotropic alignment state and is arranged in parallel, and shown in Figure 1B, the liquid crystal indicator transmitance changes, thereby realizes that GTG shows.In this process,, promptly form the multi-domain vertical alignment display mode owing to the dip plane of protrusion or because the tilting electric field that strip shaped electric poles forms triggers the orientation that liquid crystal molecule forms a plurality of directions.In this case, the observer is the shown picture of view screen under each visual angle, and observed GTG unanimity does not have the generation of phenomenons such as gray-scale inversion, has shown good viewing angle characteristic, as shown in Figure 2.

Though the GTG unanimity that the MVA display mode shows aspect the angle of squint is compared with the GTG of positive view directions, then has GTG direction interdependence.Show on the concrete color that the color of positive view directions and angle of squint direction is then not quite identical, and aberration can take place.Transmitted light intensity by LCD changes formula,

$I=I_0{\sin }^{2}2\mathrm{\φ}{\sin }^2\left[\frac{\mathrm{\π}}{\mathrm{\λ}}(n_{\mathrm{eff}}-n_0)d\right]$

Wherein, I is a transmitted light intensity, I ₀Be incident intensity, λ is a lambda1-wavelength, and d is the thickness of liquid crystal cell, and Φ is the position angle of liquid crystal molecule.Its effective refractive index $n_{\mathrm{eff}}=\frac{n_0{n}_{\mathrm{<figure-callout\; id="2"\; label="e\; n\; e"\; filenames="Y20072007218000141.png,Y20072007218000142.png"\; state="\{\{state\}\}">e</figure-callout>}}}{\sqrt{n_e^{}}},$ N here ₀, n _e, θ is respectively the polar angle of ordinary refractive index, extraordinary refractive index and the liquid crystal molecule of liquid crystal molecule.n ₀, n _e, θ and Φ definition as shown in Figure 3.

From this formula as can be seen, the effective refractive index of liquid crystal molecule is relevant with the polar angle of liquid crystal molecule, and under different visual angles, the polar angle of liquid crystal molecule performance is inequality, then can cause the variation of transmitted light intensity.The concrete ability drop that sees through that shows as, angle of squint direction the and just color that showed of view directions is inconsistent causes aberration, thereby influences angular field of view and image quality the angle of squint under.

For solving the aberration problem of angle of squint, can utilize capacity coupled method or double T FT method of driving to form the above display mode in 8 farmlands, liquid crystal molecule is reached unanimity at the effective refractive index of each view directions performance, then the transmitance difference under the different visual angles diminishes, and aberration can improve.

The utility model content

The technical matters that the utility model solves is to provide a kind of liquid crystal indicator with multi-domain vertical orientation mode, and the aberration of liquid crystal display angle of squint direction is improved.

Based on above-mentioned purpose, the utility model provides a kind of liquid crystal indicator of multi-domain vertical orientation mode, comprises a upper substrate, an infrabasal plate; One liquid crystal layer is filled between the upper and lower base plate; Described upper substrate surface is formed with common electrode, is formed with slit or projection on the common electrode; The viewing area of described infrabasal plate includes a plurality of subpixel area, is provided with pixel electrode in the sub-pixel, is formed with slit or projection on the pixel electrode; Wherein said sub-pixel is divided at least two zones with certain area ratio, and has at least the common electrode in two zones and the gap between the pixel electrode different.

Based on above-mentioned design, the liquid crystal indicator of multi-domain vertical orientation mode of the present utility model is because the common electrode and the gap between the pixel electrode that have at least two zones to form in each sub-pixel are different, then sub-pixel is under the driving of identical voltage, the electric field intensity of each zone performance is not identical entirely, liquid crystal molecular orientation performance in the same sub-pixel is different, therefore can form the effect that multidomain shows, thereby improve aberration.

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

Figure 1A is the liquid crystal molecular orientation synoptic diagram of MVA pattern when not applying electric field;

Figure 1B is the liquid crystal molecular orientation synoptic diagram of MVA pattern when applying electric field;

Fig. 2 is the display frame of observing the MVA pattern under different visual angles;

Fig. 3 A is the synoptic diagram of liquid crystal molecule state definition;

Fig. 3 B is the synoptic diagram of liquid crystal molecule refractive index definition;

Fig. 4 A is the structural representation of the common electrode of upper substrate side among the utility model embodiment;

Fig. 4 B is the structural representation of pixel electrode among the utility model embodiment;

Fig. 5 is the schematic top plan view of sub-pixel structure among the utility model embodiment;

Fig. 6 A is the form synoptic diagram of 14 region liquid crystal molecules under electric field driven among the utility model embodiment;

Fig. 6 B is the form synoptic diagram of 15 region liquid crystal molecules under electric field driven among the utility model embodiment;

Fig. 7 be under the different voltages transmitance with the variation relation figure of view angle theta;

Fig. 8 A is the V-T curve map when positive visual angle and angle of squint 60 are spent under the 4 farmland display modes;

Fig. 8 B is the V-T curve map when positive visual angle and angle of squint 60 are spent under the 8 farmland display modes;

Fig. 9 is the schematic top plan view of sub-pixel structure among the utility model embodiment;

Figure 10 is the schematic top plan view of sub-pixel structure among the utility model embodiment.

Among the figure:

10. infrabasal plate 11. projectioies (or slit) 12. pixel electrodes

14, different zone, 15,16 gaps

20. upper substrate 21. projectioies (or slit) 22. common electrodes

30. liquid crystal layer 31. liquid crystal molecules

Embodiment

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

Fig. 4 A is the structural representation of the common electrode of upper substrate side among the utility model embodiment; 4B is the structural representation of pixel electrode among the utility model embodiment.

With reference to Fig. 4 A, 4B, the liquid crystal indicator of the vertical display mode of multidomain of the present utility model comprises a upper substrate 20, an infrabasal plate 10 and is filled in liquid crystal layer 30 between upper and lower base plate 10 and 20; The viewing area of described infrabasal plate 10 includes a plurality of subpixel area, is provided with pixel electrode 12 and TFT device (not shown) in the sub-pixel, is formed with slit or projection 11 on the pixel electrode 12; Described upper substrate 20 surfaces are formed with common electrode 22, are formed with slit or projection 21 on the common electrode 22.Slit that forms on the described pixel electrode 12 or projection 11, relative with slit or projection 21 dislocation on the common electrode 22.Pixel electrode 12, common electrode 22 materials are indium tin oxide or indium-zinc oxide.

With reference to Fig. 4 B, sub-pixel is divided into two zones that area is different, is respectively 14 and 15 zones.Common electrode 22 and the gap between the pixel electrode 12 in described two zones 14,15 are different.Described sub-pixel is divided into the different zone of area, can be two zones, also can be zone more than two, and its region shape or number can design as required.

With reference to Fig. 9, different zone 14,15, two gaps can rectangular shape in the described sub-pixel.

With reference to Figure 10, sub-pixel can be divided into three zones 14,15 and 16 and show, has the gap difference in two zones in three zones 14,15,16 at least.

The look resistance layer or the flatness layer (not illustrating among the figure) that can use half-tone mask plate or gray-tone mask version on upper substrate 20, to form to have different-thickness, thus different zone, gap between common electrode 22 and the pixel electrode 11 formed.

Fig. 5 is the schematic top plan view of the utility model embodiment one sub-pixel structure.

Show and have improvement place of the 4 farmlands demonstration of technology for the multidomain of better explanation the utility model structure, present embodiment utilizes the LCD simulation softward to make the demonstration of 4 farmlands respectively, and the multidomain of using the utility model structure shows (being shown as example with 8 farmlands), compares and compares.

Concrete simulation is set as follows:

The sub-pixel structure of employing software simulation as shown in Figure 5.On the common electrode 22 on upper substrate 20, the infrabasal plate 10, pixel electrode 12, be formed with slit 21 and 11 (also can use projection, that uses is the ITO slit) respectively so that produce the multi-domain vertical alignment liquid crystal display in this simulation.If be that 4 farmlands show, then all adopt identical gap, 4.0 microns of this simulation employings between two regional common electrodes 22 and the pixel electrode 12.If adopt the utility model device to show that to form 8 farmlands then the gap between regional 14 common electrodes 22 and the pixel electrode 12 is adopted 3.5 microns, 4.0 microns gap is adopted in zone 15, can realize that 8 farmlands show.

Under 4 above-mentioned farmland display modes, performance was identical when the liquid crystal molecule in two zones was subjected to electric field driven.Under 8 above-mentioned farmland display modes, the liquid crystal molecule 31 in two zones 14,15 is because the gap difference between common electrode 22 and the pixel electrode 12, under the effect of identical voltage, the electric field intensity difference that is subjected to, the electric field action that the liquid crystal molecule 31 in zone 14 is subjected to is higher, and then liquid crystal molecule 31 more tends to the arrangement of parallel substrate 10,20 directions; Zone 15 electric field action a little less than, the degree that liquid crystal molecule 31 trend parallel substrates 10,20 directions are arranged then forms 8 farmlands and shows not as zone 14.The signal of liquid crystal molecule state as shown in Figure 6.

Utilize software simulation, Fig. 7 has provided under the 3.5V voltage, and 4 domain modes and 8 domain mode transmitances are with the variation diagram of view angle theta.In Fig. 7,8 farmlands of the utility model device show that visual angle ± 60 degree are respectively 0.02527 and 0.01164 with the difference of 0 degree.The visual angle that 4 farmlands show ± 60 degree are respectively 0.027411 and 0.037537 with the difference of 0 degree.As can be seen, to be presented at the difference that positive visual angle and≤60 transmitance diversity ratio 4 farmlands of degree within the visual angles show little on 8 farmlands.

Fig. 8 has provided the demonstration of 4 farmlands and 8 farmlands show, transmitance was with the curve of change in voltage when positive visual angle and angle of squint 60 were spent.From Fig. 8 also as can be seen, 8 farmlands under the utility model structure show that angle of squint 60 degree are littler than the difference on 4 farmlands with the difference of facing the visual angle.Fig. 7,8 shows that 8 farmlands under the utility model structure show, the minimizing of the transmitance of its angle of squint direction and positive view directions transmitance difference, and then aberration is less.

Claims (3)

1. the liquid crystal indicator of a multi-domain vertical orientation mode comprises

One upper substrate;

One infrabasal plate;

One liquid crystal layer is filled between the upper and lower base plate;

Described upper substrate surface is formed with common electrode, is formed with slit or projection on the common electrode;

The viewing area of described infrabasal plate includes a plurality of subpixel area, is provided with pixel electrode in the sub-pixel, is formed with slit or projection on the pixel electrode;

Wherein said sub-pixel is divided at least two zones with certain area ratio, and has at least the common electrode in two zones and the gap between the pixel electrode different.

2. liquid crystal indicator according to claim 1 is characterized in that described pixel electrode, common electrode material are indium tin oxide.

3. liquid crystal indicator according to claim 1 is characterized in that the area at least two zones of described sub-pixel is unequal.

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