CN102799030B - Liquid crystal display substrate and manufacturing method thereof - Google Patents
Liquid crystal display substrate and manufacturing method thereof Download PDFInfo
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- CN102799030B CN102799030B CN201210314953.6A CN201210314953A CN102799030B CN 102799030 B CN102799030 B CN 102799030B CN 201210314953 A CN201210314953 A CN 201210314953A CN 102799030 B CN102799030 B CN 102799030B
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Abstract
The invention provides a liquid crystal display substrate and a manufacturing method thereof. The liquid crystal display substrate comprises a TFT (Thin Film Transistor) substrate, a CF (Color Filter) substrate and a liquid crystal clamped between the TFT substrate and the CF substrate, wherein the liquid crystal display substrate is provided with a display area and a cutting area which are cut into a plurality of small substrates; an alignment film is arranged on the CF substrate or the TFT substrate and comprises a molecular main chain parallel to the CF substrate and a photosensitive sensing side chain perpendicular to the molecular main chain; a dye side chain parallel to the photosensitive sensing side chain is arranged in the cutting area; and an included angle between the dye side chain and the substrate is identical with a pretilt angle of the liquid crystal. According to the invention, after the liquid crystal display substrate is aligned by ultraviolet light, the pretilt angle of the liquid crystal can be obtained by measuring the brightness change of linearly polarized light of the alignment film, the problem that the online detection of the pretilt angle of the liquid crystal cannot be realized after the light alignment project is ended and before the box forming project is finished is solved and the online feedback and error correction can be carried out.
Description
Technical field
The present invention relates to a kind of liquid crystal display and manufacture method thereof of ultraviolet light orientation.
Background technology
Traditional CRT monitor relies on the phosphor powder that cathode-ray tube (CRT) electron emission clashes on screen to show image, but the principle of liquid crystal display is then completely different.Usually, liquid crystal display (LCD) device has upper substrate and infrabasal plate, has certain intervals each other and faces mutually.The multiple electrodes be formed on two substrates are facing each other.Liquid crystal is clipped between upper substrate and infrabasal plate.Voltage is applied on liquid crystal by the electrode on substrate, then changes the arrangement of liquid crystal molecule according to acted on voltage thus display image, because liquid crystal indicator described above not utilizing emitted light, it needs light source to show image.Therefore, liquid crystal indicator has and is positioned at liquid crystal panel backlight below.Control the light quantity from backlight incidence according to the arrangement of liquid crystal molecule thus show image.As shown in Figure 1, accompany color membrane substrates 104, common electrode 105, liquid crystal layer 106 and array base palte 107 between upper strata polaroid 101 and lower floor's polaroid 109, liquid crystal molecule is the material with refractive index and dielectric constant anisotropy.Array base palte 107 is formed pixel electrode 108, thin film transistor (TFT) (TFT) 114, array sub-pixel 111, sweep trace 110, signal wire 112 etc.Signal wire 112 is connected to the drain electrode of TFT, and pixel electrode 108 is connected to source class, and sweep trace 110 is connected to grid.The light that backlight 113 sends, through lower polaroid 109, becomes the polarized light with certain polarization direction.Thin film transistor (TFT) 114 controls institute's making alive between pixel electrode 108, and this voltage acts on liquid crystal to control the polarization direction of polarized light, polarized light forms monochromatic polarized light through after corresponding color film 102, if polarized light can penetrate upper strata polaroid 101, then demonstrates corresponding color; Electric field intensity is different, and the deflection angle of liquid crystal molecule is also different, through light intensity different, the brightness of display is also different.Motley image is shown by the combination of the different light intensity of RGB three kinds of colors.
In order to make liquid crystal molecule have stable original state, need to use alignment film.Alignment film needs to carry out the arrangement that orientation process could control liquid crystal molecule effectively, and alignment technique mainly contains friction (Rubbing) type and the large class of non-model control (Non-Rubbing) type two.The bad problem that non-model control orientation can avoid mechanical friction to bring to alignment film.
As shown in Figure 3, alignment film comprises some molecular backbones 10 and the photosensitive side chain 20 perpendicular to molecular backbone 10, and molecular backbone 10 is parallel to substrate.
Friction matching is the directed mechanical friction carrying out contact at macromolecule PI surface flannelette roller, friction macromolecule PI surface the energy of confession high polymer main chain 10 is aligned because of extension, and molecular backbone 10 is parallel to orientation substrate horizontally, thus control LCD alignment arrangement.The advantage of this method operates at normal temperatures, and fraction time is short, and production is high.Shortcoming is that PI material has high polarity, high-hydroscopicity, apt to deteriorate and cause orientation uneven when storing or transport; The problems such as the dust granules that friction causes, electrostatic are residual, brush mark easily reduce process yields.
Non-model control alignment technique comprises light orientation, ion beam orientation etc.The principle of light orientation utilizes the photochemical reaction of ultraviolet photopolymer monomer material to produce anisotropy, liquid crystal molecule and alignment film Surface molecular interactions, in order to reach the minimum steady state (SS) of energy, the stressed maximum direction arrangement that liquid crystal molecule defines along light orientation.Conventional light alignment technique is linear polarized uv polymerization technique (Liner Photo-polymerization by polarized UV light is called for short LPP), and nonlinear polarization ultraviolet light is also used in some light orientations.Ion beam orientation is, in evaporation mode, quasi cobalt carbon diaphragm (Diamond Like Carbon is called for short DLC) is attached to glass surface the earliest, forms the alignment film of oblique arrangement, to control liquid crystal molecular orientation.Although this technology has good orientation effect, production efficiency is low, and cost is very high again, in LCD field seldom use, is mainly used in liquid crystal on silicon (LCOS) micro-display device.In addition, argon (Ar) ion beam can also be utilized to carry out orientation process to PI film.
The process of light orientation as shown in Figure 2, before light orientation: be first coated with special material as alignment film PI on substrate; After light orientation: alignment film PI when using UV violet exposure again, the macromolecular material PI of alignment film is automatically towards the light-struck angle of UV; Form liquid crystal LC tilt angle: liquid crystal molecule LC pretilt angle automatic guide becomes the high molecular angle of alignment film.
By making liquid crystal molecule tilt along by the orientation molecular side chain direction of ultraviolet light oblique illumination, reach the effect of the initial orientation of liquid crystal molecule.
The light process of alignment schematic diagram of microcosmic as shown in Figure 3, the first step (before light orientation), the molecular backbone 10 one-tenth of the alignment film before carrying out ultraviolet light UV orientation is parallel to substrate level arrangement, and photosensitive side chain 20 is perpendicular to molecular backbone 10; Second step (after light orientation), after applying has the ultraviolet light UV at certain angle of inclination, light orientation reaction (as dimerization reaction, decomposition reaction, isomerization reaction, the reaction of light reorientation etc.) is occurred to the photosensitive side chain 20 of ultraviolet-sensitive, arranges along the vergence direction of light; 3rd step (forming the tilt angle of liquid crystal), in order to reach the minimum steady state (SS) of energy after liquid crystal molecule LC touches alignment film, the stressed maximum direction arrangement that liquid crystal molecule LC defines along light orientation, namely arranged in parallel with photosensitive side chain 20, at this moment the angle of it and substrate or main chain 10 is just called tilt angle α.
Measurement at present for tilt angle α after light orientation can only be measured by ellipsometry etc. after perfusion liquid crystal becomes box to complete, angle requirement whether up to specification is just known after this, if incongruent words, at this moment producing line has overstock a large amount of from light orientation engineering to the defective products become box engineering, can not realize on-line measurement and error correction.
Summary of the invention
The invention provides liquid crystal display substrate and the manufacture method thereof of the measurement liquid crystal pretilt angle of a kind of on-line measurement and error correction.
The invention provides a kind of liquid crystal display substrate, the liquid crystal that liquid crystal display substrate comprises TFT substrate, CF substrate and is located between TFT substrate and CF substrate, liquid crystal display substrate has the viewing area and cutting zone that cut into some little substrates, CF substrate or TFT substrate are provided with alignment film, described alignment film comprises the molecular backbone that is parallel to CF substrate and the photaesthesia side chain perpendicular to molecular backbone, in cutting zone, be provided with the dyestuff side chain parallel with photaesthesia side chain, the angle of the tilt angle of described dyestuff side chain and the angle between substrate and liquid crystal is identical.
The present invention provides again a kind of manufacture method of liquid crystal display substrate, liquid crystal display substrate is CF substrate, CF substrate has the viewing area and cutting zone that cut into some little substrates, CF substrate is provided with alignment film, described alignment film comprises the molecular backbone that is parallel to CF substrate and the photaesthesia side chain perpendicular to molecular backbone, comprises the following steps:
The first step: calculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light;
Second step: be provided with the dyestuff side chain parallel with photaesthesia side chain in cutting zone;
3rd step: before light orientation, with a Polarizer by the parallel rays polarization of incident light through, the polarization of light of the vertical direction of incident light filters, and brightness measuring device for camera records the brightness of the parallel rays polarized light of incident light;
4th step: after light orientation, dyestuff side chain and substrate have angle, and the major axis of parallel incident polarized light and dyestuff side chain forms angle, and parallel incident polarization luminance brightness decays, and brightness measuring device for camera records the brightness of the rear parallel incident polarized light of decay;
5th step: by the corresponding relation of the brightness decay of parallel incident polarized light and the liquid crystal pretilt angle of specification product, draw the tilt angle angle of liquid crystal.
The present invention provides again a kind of manufacture method of liquid crystal display substrate, liquid crystal display substrate is TFT substrate, TFT substrate has the viewing area and cutting zone that cut into some little substrates, be provided with alignment film on the tft substrate, described alignment film comprises the molecular backbone that is parallel to TFT substrate and the photaesthesia side chain perpendicular to molecular backbone, comprises the following steps:
The first step: calculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light;
Second step: be provided with the dyestuff side chain parallel with photaesthesia side chain in cutting zone;
3rd step: before light orientation, with a Polarizer by the parallel rays polarization of incident light through, the polarization of light of the vertical direction of incident light filters, and brightness measuring device for camera records the brightness of the parallel rays polarized light of incident light;
4th step: after light orientation, dyestuff side chain and substrate have angle, and the major axis of parallel incident polarized light and dyestuff side chain forms angle, and parallel incident polarization luminance brightness decays, and brightness measuring device for camera records the brightness of the rear parallel incident polarized light of decay;
5th step: by the corresponding relation of the brightness decay of parallel incident polarized light and the liquid crystal pretilt angle of specification product, draw the tilt angle angle of liquid crystal.
The present invention parallelly with it has dichroic dye side chain by other setting of the ultraviolet-sensitive side chain perpendicular to orientation molecular backbone on alignment film, liquid crystal pretilt angle can be learnt according to the measurement changed the brightness of the linearly polarized light by this alignment film after carrying out ultraviolet light orientation, to can not the problem of on-line checkingi liquid crystal pretilt angle before becoming box engineering to terminate after solving current light orientation engineering, online feedback and error correction can be carried out.
Accompanying drawing explanation
Fig. 1 is the structural representation of available liquid crystal display (LCD) device;
Fig. 2 is the procedure chart of existing smooth orientation;
Fig. 3 is the microprocess schematic diagram of the process of alignment of light shown in Fig. 2;
Fig. 4 is the schematic diagram of light orientation of the present invention;
Fig. 5 is the structural representation of liquid crystal display substrate of the present invention;
Fig. 6 is the schematic diagram of the measurement liquid crystal pretilt angle before light orientation of the present invention;
Fig. 7 is the schematic diagram measuring liquid crystal pretilt angle after light orientation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
The present invention parallelly with it has dichroic dye side chain 30 by other setting of the UV photaesthesia side chain 20 perpendicular to orientation molecular backbone 10 on alignment film, the pretilt angle of liquid crystal can be learnt according to the measurement changed the brightness of the linearly polarized light by this alignment film after carrying out ultraviolet light UV orientation, to can not the problem of on-line checkingi liquid crystal pretilt angle before becoming box engineering to terminate after solving current light orientation engineering, online feedback and error correction can be carried out.
As shown in Figure 4, alignment film comprises some molecular backbones 10 and the some photosensitive side chain 20 perpendicular to molecular backbone 10, and molecular backbone 10 is parallel to substrate.
Photaesthesia side chain 20 on alignment film is other arranges the dyestuff side chain 30 parallel with photaesthesia side chain 20, and this dyestuff side chain 30 has dichromatism, and dyestuff side chain 30 is the compounds such as toluenesulfonic acid base, anthraquinonyl, phthalocyanine base.Because photaesthesia side chain 20 is perpendicular to molecular backbone 10 or substrate before light orientation, so dyestuff side chain 30 is also perpendicular to molecular backbone 10 or substrate.
After applying has the ultraviolet light UV at certain angle of inclination, light orientation reaction (as dimerization reaction, decomposition reaction, isomerization reaction, the reaction of light reorientation etc.) is occurred to the photosensitive side chain 20 of ultraviolet-sensitive, arranges along the vergence direction of light; Dyestuff side chain 30 is subject to extruding and the drive of photosensitive side chain 20, also can arrange along the vergence direction of light, and now the angle of dyestuff side chain 30 and substrate or main chain 10 is similar to the angle of liquid crystal LC and substrate or main chain 10; In order to reach the minimum steady state (SS) of energy after liquid crystal molecule LC touches alignment film, the stressed maximum direction arrangement that liquid crystal molecule defines along light orientation, namely arranged in parallel with photosensitive side chain 20, at this moment the angle of it and substrate or main chain 10 is just called tilt angle α.
Be illustrated in figure 5 the structural representation of liquid crystal display substrate, the liquid crystal that each large liquid crystal display substrate 300 comprises TFT substrate 100, CF substrate 200 and is folded between TFT substrate 100 and CF substrate, in the present embodiment, each liquid crystal display substrate 300 can be cut into the little substrate 600 of 2*2 block, the screen shot area edge 400 on substrate and edge of display area 102 is stayed after each little substrate 600 comprises exposure, wherein screen shot area edge 400 is exactly the edge cutting little substrate 600, and edge of display area 102 is edges that each little substrate 600 can show image.
The region do not overlapped at large liquid crystal display substrate 300 and four little substrates 600 is cutting zone 500, and this cutting zone 500 can be used for measuring the measurement zone of liquid crystal pretilt angle.
Described dyestuff side chain 30 is positioned at this cutting zone 500, after completing light orientation, the cutting zone 500 of TFT substrate 100 or CF substrate 200 is the tilt angle measurement zone shown in Fig. 4, and the screen shot area edge 400 of each little substrate 600 and edge of display area 102 are the viewing area shown in Fig. 4, because cutting zone 500 is finally cut, therefore the performance that dyestuff side chain 30 can not affect liquid crystal is set in cutting zone 500.
By measuring the angle between dyestuff side chain 30 in cutting zone 500 and substrate, need an a linear polarization plate 40 and measurement mechanism 50 twice, precalculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light, concrete measuring method is as described below.
As shown in Figure 6, before ultraviolet light orientation, with a line Polarizer 40 by the parallel rays of incident light L
l ∥polarized light through, by the vertical direction light L of incident light L
⊥polarized light filters, due to the parallel rays L of incident light L
∥ is inclinedshake the major axis of light perpendicular to dyestuff side chain 30, and dye materials carries out microabsorption to light, the most of light transmitted, and brightness measuring device for camera 50 records the parallel rays L of most of incident light L
∥the brightness of polarized light.Before ultraviolet light orientation, common incident light L, instead of ultraviolet light is because ultraviolet light can react to photosensitive side chain 20, and with dyestuff side chain 30 understand to common incident light L polarization through.
As shown in Figure 7, after ultraviolet light orientation, dyestuff side chain 30 is not perpendicular to substrate arrangement, but has certain angle with substrate, the parallel rays L of incident light L
∥the major axis shape of polarized light and dyestuff side chain 30 forms an angle, and dye materials carries out certain absorption to light, the parallel rays L of incident light L
∥polarized light brightness decays, and brightness measuring device for camera 50 records the parallel rays of the rear incident light L of decay
l ∥the brightness of polarized light.
Such as, can be 88 degree by the tilt angle of off-line measurement device measuring specification product, and the parallel rays L of incident light L after the decay of this on-line measurement measurement device of its correspondence
∥the brightness of polarized light is 100 units, and tilt angle is 89 degree of corresponding 110 units, tilt angle is 87 degree of corresponding 90 units etc., can set up the parallel rays L of tilt angle and the rear incident light L of decay
∥the relation table of the brightness of polarized light.So, just can by the parallel rays L of the incident light L of on-line measurement measurement device
∥the corresponding relation of polarized light brightness decay and liquid crystal pretilt angle, knows the tilt angle angle of liquid crystal in real time.
Be positioned at the inclination angle of the dyestuff side chain 30 of cutting zone 500 by on-line measurement, thus the tilt angle of liquid crystal LC can be known.
The method step that the present invention measures liquid crystal pretilt angle is as follows:
The first step: precalculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light.
Second step: be provided with the dyestuff side chain 30 parallel with photaesthesia side chain 20 in cutting zone 500.
3rd step: before light orientation, with a Polarizer 40 by the parallel rays polarization of incident light through, the polarization of light of the vertical direction of incident light filters, and brightness measuring device for camera 50 records the parallel rays L of incident light L
∥the brightness of polarized light.
4th step: after light orientation, dyestuff side chain 30 and substrate have certain angle, the major axis of parallel incident polarized light and dyestuff side chain 30 forms angle, and parallel incident polarization luminance brightness decays, and brightness measuring device for camera 50 records the brightness of the rear parallel incident polarized light of decay;
5th step: by the corresponding relation of the brightness decay of parallel incident polarized light and the liquid crystal pretilt angle of specification product, draw the tilt angle angle of liquid crystal.
In said method, alignment film can be arranged on CF substrate, also can arrange on the tft substrate.
The present invention parallelly with it has dichroic dye side chain by other setting of the ultraviolet-sensitive side chain perpendicular to orientation molecular backbone on alignment film, liquid crystal pretilt angle can be learnt according to the measurement changed the brightness of the linearly polarized light by this alignment film after carrying out ultraviolet light orientation, to can not the problem of on-line checkingi liquid crystal pretilt angle before becoming box engineering to terminate after solving current light orientation engineering, online feedback and error correction can be carried out.
Claims (3)
1. the manufacture method of a liquid crystal display substrate, liquid crystal display substrate is CF substrate, CF substrate has the viewing area and cutting zone that cut into some little substrates, CF substrate is provided with alignment film, described alignment film comprises the molecular backbone that is parallel to CF substrate and the photaesthesia side chain perpendicular to molecular backbone, it is characterized in that, comprise the following steps:
The first step: calculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light;
Second step: be provided with the dyestuff side chain parallel with photaesthesia side chain in cutting zone;
3rd step: before ultraviolet light orientation, with a Polarizer by the parallel rays polarization of incident light through, the polarization of light of the vertical direction of incident light filters, and brightness measuring device for camera records the brightness of the parallel rays polarized light of incident light;
4th step: after ultraviolet light orientation, dyestuff side chain and substrate have angle, and the major axis of parallel incident polarized light and dyestuff side chain forms angle, and parallel incident polarization luminance brightness decays, and brightness measuring device for camera records the brightness of the rear parallel incident polarized light of decay;
5th step: by the corresponding relation of the brightness decay of parallel incident polarized light and the liquid crystal pretilt angle of specification product, draw the tilt angle angle of liquid crystal.
2. the manufacture method of a liquid crystal display substrate, liquid crystal display substrate is TFT substrate, TFT substrate has the viewing area and cutting zone that cut into some little substrates, be provided with alignment film on the tft substrate, described alignment film comprises the molecular backbone that is parallel to TFT substrate and the photaesthesia side chain perpendicular to molecular backbone, it is characterized in that, comprise the following steps:
The first step: calculate the relation between the angle of the liquid crystal pretilt angle of specification product and the brightness of incident ray polarized light;
Second step: be provided with the dyestuff side chain parallel with photaesthesia side chain in cutting zone;
3rd step: before ultraviolet light orientation, with a Polarizer by the parallel rays polarization of incident light through, the polarization of light of the vertical direction of incident light filters, and brightness measuring device for camera records the brightness of the parallel rays polarized light of incident light;
4th step: after ultraviolet light orientation, dyestuff side chain and substrate have angle, and the major axis of parallel incident polarized light and dyestuff side chain forms angle, and parallel incident polarization luminance brightness decays, and brightness measuring device for camera records the brightness of the rear parallel incident polarized light of decay;
5th step: by the corresponding relation of the brightness decay of parallel incident polarized light and the liquid crystal pretilt angle of specification product, draw the tilt angle angle of liquid crystal.
3. the manufacture method of liquid crystal display substrate according to claim 1 and 2, is characterized in that: described dyestuff side chain is the compound of toluenesulfonic acid base or anthraquinonyl or phthalocyanine base.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104714338A (en) * | 2013-12-16 | 2015-06-17 | 群创光电股份有限公司 | Liquid crystal display panel |
| WO2016026187A1 (en) * | 2014-08-20 | 2016-02-25 | 深圳市华星光电技术有限公司 | Method for measuring box thickness and pre-tilt angle of liquid crystal layer |
| US10754198B2 (en) * | 2015-03-18 | 2020-08-25 | Sharp Kabushiki Kaisha | Liquid crystal display device |
| CN105842889B (en) * | 2016-06-21 | 2019-09-06 | 京东方科技集团股份有限公司 | The detection device and method of light alignment substrates |
| CN107065238B (en) * | 2017-01-22 | 2020-07-03 | 京东方科技集团股份有限公司 | Alignment film surface detection device and method |
| CN109188784B (en) | 2018-10-29 | 2022-02-22 | 合肥鑫晟光电科技有限公司 | Display substrate, manufacturing method thereof and display device |
| CN113467131B (en) * | 2021-06-28 | 2022-05-24 | 北海惠科光电技术有限公司 | Alignment film manufacturing method |
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| JP2010230815A (en) * | 2009-03-26 | 2010-10-14 | Dic Corp | Method for measuring tilt angle of alignment layer, optical alignment layer, and optically anisotropic body |
| KR20110066052A (en) * | 2009-12-10 | 2011-06-16 | 엘지디스플레이 주식회사 | Method of fabricating alignment layer of liquid crystal display device and testing thereof |
| CN102317844A (en) * | 2009-05-15 | 2012-01-11 | 夏普株式会社 | Liquid crystal display device |
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| US6001277A (en) * | 1995-05-26 | 1999-12-14 | Hitachi Chemical Company, Ltd. | Liquid-crystal alignment film |
| JP2010230815A (en) * | 2009-03-26 | 2010-10-14 | Dic Corp | Method for measuring tilt angle of alignment layer, optical alignment layer, and optically anisotropic body |
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