CN102062978A

CN102062978A - Liquid crystal display panel

Info

Publication number: CN102062978A
Application number: CN2010105413943A
Authority: CN
Inventors: 蔡正晔; 黄泰翔; 杉浦规生
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2010-11-10
Filing date: 2010-11-10
Publication date: 2011-05-18

Abstract

The invention relates to a liquid crystal display panel, which comprises a base plate, a plurality of pixel structures arranged on the base plate, an opposite base plate positioned on the opposite side of the base plate, and a liquid crystal layer positioned between the base plate and the opposite base plate. Each pixel structure comprises a scanning line, a data wire, an active component, a pixel electrode and a common electrode. The common electrode and the pixel electrode are insulated with each other and are arranged alternately with each other. The pixel electrode and the common electrode consist of a bottom electrode and a top electrode positioned above the bottom electrode respectively, and the width (W1) of the top electrode is small than the width (W2) of the bottom electrode. The liquid crystal layer comprises liquid crystal molecules, wherein the liquid crystal molecules have optical anisotropy in an electric field and have optical isotropy under a condition without the electric field.

Description

Display panels

Technical field

The present invention relates to a kind of display panels, and particularly relevant for a kind of display panels that improves the concealed wire phenomenon.

Background technology

Along with showing the flourish of science and technology, consumption is popular more and more higher for the requirement of display image display quality.Consumption is popular except the specification to the resolution (resolution) of display, contrast (contrast ratio), visual angle (viewing angle), gray-scale inversion (grey level inversion), color saturation (color saturation) requires to some extent, and the specification requirement in reaction time (response time) of display is also day by day improved.

In order to satisfy the popular demand of consumption, the numerous and confused exploitation that drops into blue phase (blue phase) LCD of the relevant dealer of display with rapid answer characteristic.With blue phase (blue phase) liquid crystal of eurymeric is example, and it needs a transverse electric field to operate so that it has the function of light valve.The someone adopts the electrode design of coplane conversion IPS (In-Plane Switching) display panel to drive eurymeric blue phase liquid crystal molecule in blue phase (blue phase) LCD at present.

Yet, in the electrode design of conventional co-planar conversion display panel, its electrode top has many zones not have transverse electric field, and makes have many liquid crystal molecules to be driven smoothly in blue phase (blue phase) LCD, and then causes the generation of concealed wire phenomenon.Hold above-mentionedly, how to improve the phenomenon of concealed wire in blue phase (blue phase) LCD, real be one of problem of developer institute desire solution.

Summary of the invention

The invention provides a kind of display panels, it can improve the concealed wire phenomenon in the known display panels.

The present invention proposes a kind of display panels, and it comprises substrate, be arranged on a plurality of dot structures on the substrate, at the subtend substrate and the liquid crystal layer between substrate and subtend substrate of substrate subtend.Each dot structure comprises sweep trace, data line, active member, pixel electrode and common electrode.Active member and sweep trace and data line electrically connect.Pixel electrode and active member electrically connect.Common electrode and pixel electrode are electrically insulated and are arranged alternately each other.Pixel electrode and common electrode are made of bottom electrode and the top electrode that is positioned on the bottom electrode, and the width of top electrode (W1) is less than the width (W2) of bottom electrode.Liquid crystal layer comprises liquid crystal molecule, and wherein liquid crystal molecule has the optical anisotropy and be tropisms such as optics under no current field condition in electric field.

Based on above-mentioned, in display panels of the present invention,, make that the regional percentage of no transverse electric field reduces in the display panels by the particular design of pixel electrode and common electrode.Thus, the not driven probability of liquid crystal molecule that is arranged in display panels then can reduce, and then has improved the phenomenon of concealed wire in the known liquid crystal panel.

Description of drawings

Fig. 1 is the display panels diagrammatic cross-section of one embodiment of the invention;

Fig. 2 is the vertical view of substrate of the display panels of Fig. 1;

Fig. 3 A, Fig. 3 B, Fig. 3 C, Fig. 3 D are the local pixel structural profile synoptic diagram of one embodiment of the invention;

Fig. 4 uses interelectrode electric force lines distribution synoptic diagram together for the pixel electrode of one embodiment of the invention;

Fig. 5 is the synoptic diagram that concerns of the driving voltage of display panels of known display panels and one embodiment of the invention and penetrability.

Wherein, Reference numeral

100: display panels 110: substrate

120: dot structure 122: pixel electrode

122 ': strip

pixel electrode pattern

122a, 124a: top electrode

122b, 124b: bottom electrode 124: common electrode

124 ': strip common electrode pattern 130: liquid crystal layer

132: liquid crystal molecule 140: the subtend substrate

SL: sweep trace DL: data line

T: active member G: grid

CH: passage S: source electrode

D: drain electrode GI, BP: insulation course

TH: contact hole W: spacing

W1, W2: width S 1, S2, S3, S4: surface

E1, E2: electric field Ta, Tb, Tc, Td, Te: penetrability

Va, Vb, Vc, Vd, Ve: saturation voltage

Embodiment

Fig. 1 is the diagrammatic cross-section of display panels according to an embodiment of the invention.Fig. 2 is the vertical view of substrate of the display panels of Fig. 1.One of them dot structure that Fig. 1 and Fig. 2 only show this display panels is that example illustrates.Generally speaking, display panels is that the dot structure by a plurality of arrayed is constituted, and those skilled in the art should understand the structure of display panels of the present invention according to this instructions and the description of the drawings.Please be simultaneously with reference to Fig. 1 and Fig. 2, the display panels 100 of present embodiment comprises substrate 110, a plurality of dot structure 120, liquid crystal layer 130 and subtend substrate 140.

Substrate 110 mainly is the usefulness that is used for carrying dot structure 120, and its material can be glass, quartz, organic polymer or light tight/reflecting material (for example: conductive material, wafer, pottery or other material applicatory) or other material applicatory.

A plurality of dot structures 120 are arranged on the substrate 110.Each dot structure 120 of present embodiment can comprise sweep trace SL, data line DL, active member T, pixel electrode 122 and common electrode 124.

Sweep trace SL and data line DL are arranged on the substrate 110.Sweep trace SL and data line DL setting interlaced with each other.In other words, the bearing of trend of the bearing of trend of data line DL and sweep trace SL is not parallel, and preferably, the bearing of trend of data line DL is vertical with the bearing of trend of sweep trace SL.In addition, sweep trace SL belongs to different retes with data line DL.Based on the consideration of electric conductivity, sweep trace SL and data line DL generally are to use metal material.But, the invention is not restricted to this, according to other embodiment, sweep trace SL and data line DL also can use other conductive materials.For example: the oxides of nitrogen of the nitride of alloy, metal material, the oxide of metal material, metal material or metal material and other are led the stack layer of material.

Active member T and sweep trace SL and data line DL electrically connect.More specifically, the active member T of present embodiment can comprise grid G, channel C H, source S and drain D.In the present embodiment, the subregion of sweep trace SL is as grid G.Channel C H is positioned at the top of grid G.The subregion of data line DL is as source S.Source S and drain D are positioned at the top of channel C H.Above-mentioned active member T is to be that example illustrates with the bottom grid film transistor, but the invention is not restricted to this.According to other embodiment, above-mentioned active member T is also with the top grid type thin film transistor (TFT).According to present embodiment, the grid G of active member T top more is coated with insulation course GI, and it can be described as gate insulator again.In addition, more be coated with another insulation course BP above active member T, it can be described as protective seam again.The material of insulation course GI, BP (for example: the stack layer of monox, silicon nitride, silicon oxynitride or above-mentioned at least two kinds of materials), organic material or above-mentioned combination can be inorganic material.

Pixel electrode 122 is arranged on the substrate 110, and electrically connects with the drain D of active member T.According to present embodiment, pixel electrode 122 is arranged on the insulation course GI, and pixel electrode 122 is to electrically connect with the drain D of active member T by contact hole TH.Pixel electrode 122 comprises metal conductive oxide material, metal or its combination.In the present embodiment, pixel electrode 122 for example is indium tin oxide, indium-zinc oxide, aluminium tin-oxide, aluminium zinc oxide, indium germanium zinc oxide, other suitable oxide, molybdenum (Mo), tantalum (Ta), chromium (Cr), tungsten (W), aluminium (Al), other suitable metal or the above-mentioned stack layer of the two at least.

Common electrode 124 is arranged on the substrate 110, and itself and pixel electrode 122 are electrically insulated.Particularly, common electrode 124 is arranged alternately each other with pixel electrode 122.Specifically, common electrode 124 can comprise a plurality of strip common electrode pattern 124 ', and pixel electrode 122 can comprise a plurality of strip pixel electrode pattern 122 ', and these strip pixel electrode pattern 124 ', 122 ' are arranged alternately each other, as shown in Figure 2.

In addition, each strip pixel electrode pattern 122 ' can be made of its bottom electrode 122b and the top electrode 122a that is positioned on the bottom electrode 122b, and each strip common electrode pattern 124 ' also can be made of its bottom electrode 124b and the top electrode 124a that is positioned on the bottom electrode 124b.In the present embodiment, common electrode 124 spendable materials and pixel electrode 122 spendable materials similar just no longer repeat at this.

What deserves to be mentioned is that

top electrode

122a, 124a can be identical or inequality with the employed material of bottom electrode 122b, 124b.Preferably, the employed material of

bottom electrode

122b, 124b is a light transmissive material, for example indium tin oxide or other metal oxides, and the employed material of

top electrode

122a, 124a is a metal material, for example molybdenum (Mo) or other metals.But the present invention is not as limit.

Subtend substrate 140 is positioned at the subtend of substrate 100.In the present embodiment, subtend substrate 140 for example is a colored filter substrate, and it can comprise colored filter and black-matrix layer.But the present invention is not as limit, and in other embodiments, subtend substrate 140 also can be the substrate of other suitable types.

Liquid crystal layer 130 is between substrate 100 and subtend substrate 140, and it is suitable for as a light valve.Liquid crystal layer 130 comprises liquid crystal molecule 132.In particular, liquid crystal molecule 132 has optical anisotropy (anisotropic) and be tropisms (isotropic) such as optics under no current field condition in an electric field.For example, liquid crystal molecule 132 for example is blue phase (blue phase) liquid crystal molecule, and when applying an electric field thereon the time, it has optical anisotropy (anisotropic), and when no electric field was applied thereto, it was tropisms (isotropic) such as optics.

In other words, the optical characteristics of moment ground change blue phase (blue phase) liquid crystal molecule can be come, so adopt the liquid crystal panel 100 of blue phase (blue phase) liquid crystal molecule can have performance of preferable reaction time (response time) by the size of extra electric field.But liquid crystal molecule 132 of the present invention is as limit, and in other embodiments, liquid crystal molecule is eurymeric liquid crystal molecule or other suitable liquid crystal molecules also.

The local pixel structural profile synoptic diagram that Fig. 3 A is illustrated for the hatching line I-I ' in Fig. 2.Please be simultaneously with reference to Fig. 2 and Fig. 3 A, in the present embodiment, pixel electrode 122 is made of bottom electrode 122b and the top electrode 122a that is positioned on its bottom electrode 122b, and common electrode 124 is made of bottom electrode 124b and the top electrode 124a that is positioned on its bottom electrode 124b.What be worth paying special attention to is that the width W 2 of

bottom electrode

122b, 124b is bigger than the width W 1 of top electrode 122a, 124a.Be preferably, the ratio W1/W2 of the width W 1 of

top electrode

122a, 124a and the width W 2 of

bottom electrode

122b, 124b is between 0.4～0.8, and wherein optimum range is 0.45～0.65.

For example, the width W 1 of

top electrode

122a, 124a can be 3 microns, and the width W 2 of

bottom electrode

122b, 124b can be 4～7 microns.More particularly, in one embodiment, the width W 1 of

top electrode

122a, 124a can be 3 microns, and the width W 2 of

bottom electrode

122b, 124b can be 4 microns, as shown in Figure 3A.In another embodiment, the width W 1 of

top electrode

122a, 124a can be 3 microns, and the width W 2 of

bottom electrode

122b, 124b can be 5 microns, shown in Fig. 3 B.In another embodiment, the width W 1 of

top electrode

122a, 124a can be 3 microns, and the width W 2 of

bottom electrode

122b, 124b can be 6 microns, shown in Fig. 3 C.In an embodiment again, the width W 1 of

top electrode

122a, 124a can be 3 microns, and the width W 2 of

bottom electrode

122b, 124b can be 7 microns, shown in Fig. 3 D.

In addition, in the present embodiment, these strip pixel electrode pattern 122 ' are all identical with spacing W between the contiguous strip common electrode pattern 124 ', as shown in Figure 2.For example, the spacing W between strip common electrode 124 patterns of pixel electrode 122 patterns and vicinity for example is 3 microns, shown in Fig. 3 A, Fig. 3 B, Fig. 3 C and Fig. 3 D.But the present invention is not as limit, and in other embodiments, the spacing W between strip common electrode 124 patterns of pixel electrode 122 patterns and vicinity also can be other suitable spacings.

Fig. 4 uses interelectrode electric force lines distribution synoptic diagram together for the pixel electrode of one embodiment of the invention.Please refer to Fig. 4, have the first transverse electric field E1 between the side surface S2 of the bottom electrode 124b of the common electrode 124 of the side surface S1 of the bottom electrode 122b of pixel electrode 122 and vicinity.Has the second transverse electric field E2 between the upper surface S4 of the bottom electrode 124b of the common electrode 124 of the upper surface S3 of the bottom electrode 122b of pixel electrode 122 and vicinity.In other words, the pixel electrode 122 by present embodiment and the design of common electrode 124 can make directly over the pixel electrode 122, the regional percentage reduction of no transverse electric field directly over the common electrode 124 and between pixel electrode 122 and the common electrode 124.Thus, directly over pixel electrode 122, the

common electrode

124 and 132 of the liquid crystal molecules between pixel electrode 122 and the common electrode 124 have higher probability to be driven, and then improve the phenomenon of concealed wire in the known display panels.

Fig. 5 is the synoptic diagram that concerns of the driving voltage of display panels of known display panels and one embodiment of the invention and penetrability.Please refer to Fig. 5, the curve a among Fig. 5 represents the driving voltage of known display panels and the relation of penetrability.Curve b, c, d, e represent the driving voltage of display panels of one embodiment of the invention and the relation of penetrability.

For example, it is 4 microns that curve b represents the width W 2 of bottom electrode 122b, the 124b of display panels 100, the width W 1 of

top electrode

122a, 124a be the spacing W between 3 microns and pixel electrode 122 and the common electrode 124 when being 3 microns driving voltage and the relation of penetrability.It is 5 microns that curve c represents the width W 2 of bottom electrode 122b, the 124b of display panels 100, the width W 1 of

top electrode

122a, 124a be the spacing W between 3 microns and pixel electrode 122 and the common electrode 124 when being 3 microns driving voltage and the relation of penetrability.It is 6 microns that curve d represents the width W 2 of bottom electrode 122b, the 124b of display panels 100, the width W 1 of

top electrode

122a, 124a be the spacing W between 3 microns and pixel electrode 122 and the common electrode 124 when being 3 microns driving voltage and the relation of penetrability.It is 7 microns that curve e represents the width W 2 of bottom electrode 122b, the 124b of display panels 100, the width W 1 of

top electrode

122a, 124a be the spacing W between 3 microns and pixel electrode 122 and the common electrode 124 when being 3 microns driving voltage and the relation of penetrability.

Can know clearly that by Fig. 5 maximum transmission degree (transmittance) Tb, Tc, Td and the Te of the display panels of one embodiment of the invention be the maximum transmission degree Ta height of more known liquid crystal panel all.In other words, the design of the dot structure of one embodiment of the invention can effectively promote liquid crystal panel penetrability (transmittance).Particularly, when the ratio W1/W2 of the width W 1 of top electrode (122a, 124a) and the width W 2 of bottom electrode (122b, 124b) between 0.45～0.65 the time, it promotes the best results of liquid crystal panel penetrability (transmittance).For example, compared to known display panels, it can effectively promote maximum transmission degree (transmittance) about 10%～15%.

In addition, by Fig. 5 also as can be known, all the saturation voltage Va than known display panels is low for the saturation voltage of the display panels of one embodiment of the invention (saturation voltage) Vb, Vc, Vd and Ve.In other words, the driving voltage that the display panels 100 of one embodiment of the invention can be lower drives.That is to say that the display panels 100 of one embodiment of the invention can the next power saving of more known display panels.

In sum, in display panels of the present invention, can utilize pixel electrode and the common electrode formed by its upper/lower electrode respectively, make directly over pixel electrode, the common electrode and between pixel electrode and the common electrode regional percentage of no transverse electric field reduce.Thus, directly over pixel electrode, the common electrode and the liquid crystal molecule between pixel electrode and the common electrode then have higher probability to be driven, and then improved the phenomenon of concealed wire in the known liquid crystal panel.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims

1. a display panels is characterized in that, comprising:

One substrate;

A plurality of dot structures are arranged on this substrate, and wherein each dot structure comprises: an one scan line and a data line; One active member, itself and this sweep trace and this data line electrically connect; One pixel electrode, itself and this active member electrically connects; Use electrode altogether, itself and this pixel electrode is electrically insulated, this pixel electrode and this common electrode are arranged alternately, and wherein this pixel electrode and this common electrode are made of a bottom electrode and the top electrode that is positioned on this bottom electrode respectively, and the width of this top electrode is less than the width of this bottom electrode;

One subtend substrate is positioned at the subtend of this substrate; And

One liquid crystal layer, between this substrate and this subtend substrate, this liquid crystal layer comprises liquid crystal molecule, wherein said liquid crystal molecule has the optical anisotropy and be tropisms such as optics under no current field condition in an electric field.

2. display panels according to claim 1 is characterized in that this liquid crystal molecule comprises the blue phase liquid crystal molecule.

3. display panels according to claim 1 is characterized in that, the width of this top electrode is 3 microns, and the width of this bottom electrode is 4～7 microns.

4. display panels according to claim 1 is characterized in that, this pixel electrode and this common electrode comprise metal conductive oxide material, metal or its combination.

5. display panels according to claim 1, it is characterized in that, this pixel electrode comprises a plurality of strip pixel electrode pattern, and this common electrode comprises a plurality of strip common electrode pattern, and these strip pixel electrode pattern and these strip common electrode pattern are arranged alternately.

6. display panels according to claim 5 is characterized in that, each strip pixel electrode pattern and each strip common electrode pattern are made of this bottom electrode and this top electrode respectively.

7. display panels according to claim 5 is characterized in that, these strip pixel electrode pattern are all identical with spacing between the contiguous strip common electrode pattern.

8. display panels according to claim 1, it is characterized in that, have one first transverse electric field between the side surface of this bottom electrode of the common electrode of the side surface of this bottom electrode of this pixel electrode and vicinity, have one second transverse electric field between the upper surface of this bottom electrode of the common electrode of the upper surface of this bottom electrode of this pixel electrode and vicinity.

9. display panels according to claim 1 is characterized in that, the ratio of the width of this top electrode and the width of this bottom electrode is between 0.4～0.8.

10. display panels according to claim 1 is characterized in that, the ratio of the width of this top electrode and the width of this bottom electrode is between 0.45～0.65.