CN103901659A - Light filter plate for liquid crystal display panel in IPS (in-plane switching) mode and liquid crystal display device - Google Patents
Light filter plate for liquid crystal display panel in IPS (in-plane switching) mode and liquid crystal display device Download PDFInfo
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- CN103901659A CN103901659A CN201210581700.5A CN201210581700A CN103901659A CN 103901659 A CN103901659 A CN 103901659A CN 201210581700 A CN201210581700 A CN 201210581700A CN 103901659 A CN103901659 A CN 103901659A
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Abstract
The invention discloses a light filter plate for a liquid crystal display panel in an IPS (in-plane switching) mode and a liquid crystal display device. The light filter plate comprises a substrate, shading patterns, light filter layers, a flat layer and photo spacers. The shading patterns and the light filter layers are positioned on the substrate and have overlap regions; the flat layer covers the shading patterns and the light filter layers; the photo spacers are positioned on the flat layer and are positioned above the overlap regions of the light filter layers and the shading patterns, and the distances from the edges of the bottoms of the photo spacers to the edges of the shading patterns in the direction parallel to the surface of the substrate are larger than or equal to 3 micrometers and are smaller than or equal to 6 micrometers. According to the technical scheme, the light filter plate and the liquid crystal display device have the advantages that poor liquid crystal orientation of the light filter plate can be prevented; poor display of the liquid crystal display device can be prevented after an array substrate of the liquid crystal display device clings to the light filter plate and voltages are applied to electrodes.
Description
Technical field
The present invention relates to demonstration field, relate in particular to filter, liquid crystal indicator for IPS mode liquid crystal display panel.
Background technology
In recent years, along with developing rapidly of information communication field, increasing to the demand of various types of display devices.The display device of main flow mainly contains at present: liquid crystal indicator (LCD), plasm display device (PDP), el display device (ELD) and vacuum fluorescent display device (VFD) etc.Such as, because liquid crystal indicator has: the advantage such as light, thin, volume is little, power consumption is little, radiation is low, is widely used in various data processing equipments, TV, notebook computer, mobile phone, personal digital assistant etc.Liquid crystal indicator mainly comprises: the liquid crystal layer between tft array substrate, color filter, tft array substrate and color filter.
Fig. 1 is the cross-sectional view of color filter in the TN mode LCD of prior art, with reference to figure 1, mainly comprise for the color filter 10 of liquid crystal indicator at present: transparent glass substrate 11, shielding pattern layer (BM layer) 12, chromatic filter layer (RBG layer) 13, common electrode layer (ITO layer) 14, spacer (Photo Spacer, PS) 15.Wherein chromatic filter layer 13 covers in the open area of shielding pattern layer 12, and has certain lap with shielding pattern layer 12.Shielding pattern layer 12, the normal Pigments method that adopts light blockage coating of chromatic filter layer 13 are manufactured, concrete technology is: first by liquid light blockage coating at substrate surface, then by the exposure mask plate with given pattern, use close induction type (Proximity) exposure machine to expose, then through developing and bake process formation anticipation pattern.
Along with the development of liquid crystal indicator production industry, consumer improves day by day to liquid crystal indicator quality requirements, promote liquid crystal indicator towards high-resolution, high resolving power, the fine future developments such as wide viewing angle, from TN technology to IPS(In-Plane Switching, plane is switched) technical development.
Fig. 2 is the cross-sectional view of color filter in the IPS mode LCD of prior art, with reference to figure 2, the filter 20 of IPS mode LCD comprises: transparent glass substrate 21, be positioned at shielding pattern layer (BM layer) 22 on substrate 21, be positioned at chromatic filter layer (RBG layer) 23 on shielding pattern layer 22 and substrate 21, be positioned at flatness layer (the over coating on chromatic filter layer 23, inspection claims OC layer) 26, be positioned at spacer (Photo Spacer is called for short PS) 25 on flatness layer 26, be positioned at the ITO screen layer 24 at substrate 21 back sides.RBG pixel in its chromatic filter layer 23 covers in the open area of shielding pattern layer 22, and has certain lap with shielding pattern layer 22.In the filter of using in IPS display mode, due to the requirement of light-shielding pattern graph thinning, RBG pixel inevitably overlaps on light-shielding pattern, higher in order to reduce this overlapping picture element ox horn causing, and on shielding pattern layer 22 and chromatic filter layer 23, is provided with flatness layer 26.Spacer 25 is arranged on flatness layer 26, and is positioned at the top of RBG pixel overlay region on light-shielding pattern.
But, in prior art, after being fitted, color filter and tft array substrate make after liquid crystal indicator, often there is the phenomenon of liquid crystal indicator light leak.
Summary of the invention
The problem that the present invention solves is the phenomenon that light leak appears in IPS mode LCD.
For addressing the above problem, the invention provides a kind of filter for IPS mode liquid crystal display panel, comprising:
Substrate;
Be positioned at light-shielding pattern and filter layer on described substrate, described light-shielding pattern and described filter layer have overlapping region;
Flatness layer, covers described light-shielding pattern and filter layer;
Be positioned at the spacer on described flatness layer, and described spacer is positioned at the top, overlapping region of filter layer and light-shielding pattern, in parallel substrate surface direction, the distance at described spacer bottom margin and described light-shielding pattern edge is more than or equal to 3 μ m, is less than or equal to 6 μ m.
Optionally, described spacer top dimension is more than or equal to 5 μ m, is less than or equal to 20 μ m, and described spacer top and bottom size difference are less than or equal to 5 μ m.
Optionally, described filter layer at least comprises R color filter layer, G color filter layer and B color filter layer, and the filter layer of adjacent two kinds of colors has lap with the overlapping region of light-shielding pattern, and described spacer is positioned at described lap top.
Optionally, the live width of described light-shielding pattern is more than or equal to 15 μ m, is less than or equal to 25 μ m.
Optionally, the distance of described spacer bottom surface and described light-shielding pattern end face, for being more than or equal to 2 μ m, is less than or equal to 5 μ m.
Optionally, also comprise: the screen layer that is positioned at described substrate back.
Optionally, the material of described screen layer is ITO.
Optionally, described spacer comprises master space post, secondary spacer, and the height of described master space post is greater than the height of described secondary spacer.
The present invention also provides a kind of liquid crystal indicator, comprises described filter.
Compared with prior art, the present invention has the following advantages:
The filter of the technical program, in parallel substrate surface direction, the distance at spacer bottom margin and light-shielding pattern edge is more than or equal to 3 μ m, is less than or equal to 6 μ m.In this distance range, there will not be the bad problem of LCD alignment, when by after the array base palte of liquid crystal indicator and filter laminating, during to electrode application voltage, reduce to occur that liquid crystal indicator shows bad problem.
In specific embodiment, described spacer top dimension is more than or equal to 5 μ m, is less than or equal to 20 μ m, and the dimension difference at spacer bottom and top is less than or equal to 5 μ m, and the distance at spacer bottom margin and light-shielding pattern edge is more than or equal to 3 μ m, be less than or equal to 6 μ m.Meeting in the dimension difference of spacer top and bottom and the distance situation at spacer bottom margin and light-shielding pattern edge, can better reduce the bad problem of LCD alignment.
Brief description of the drawings
Fig. 1 is the cross-sectional view of color filter in the TN mode LCD of prior art;
Fig. 2 is the cross-sectional view of color filter in the IPS mode LCD of prior art;
Fig. 3 is the cross-sectional view of color filter in the IPS mode LCD of the specific embodiment of the invention.
Embodiment
Inventor finds through research, cause the former of IPS mode LCD light leak in prior art because:
Different from traditional TN pattern, the electrode that IPS mode LCD applies driving voltage is all arranged on tft array substrate surface, and liquid crystal molecule turns at the plane internal rotation that is parallel to tft array substrate and filter.Under tradition TN pattern, general control interval column top is to light-shielding pattern Edge Distance.In order to improve colored optical filtering substrates product quality, meet the requirement of the high-precision refinement of IPS mode LCD, on colored optical filtering substrates, the size of light-shielding pattern constantly reduces.With reference to figure 2, now, spacer 25 is apart from also corresponding the reducing of distance at light-shielding pattern edge, but in IPS mode LCD, due to planar left rotation and right rotation of liquid crystal molecule, if spacer bottom margin is too small apart from light-shielding pattern Edge Distance x, in liquid crystal molecule when rotation, can easily be subject to the impact of filter layer and light-shielding pattern lap projection and deflection is not good causes orientation bad.And if spacing keeps enough large, just can not occur.
In addition, if spacer bottom when excessive, also can cause liquid crystal molecule rotation time, can easily be subject to the impact of filter layer and light-shielding pattern lap projection and deflection is not good causes orientation bad.Conventionally, top dimension and the bottom size of spacer are unequal, and bottom size is greater than top dimension.In the process of formation spacer, conventionally can not provide simultaneously need the spacer top dimension of formation and the value of bottom size, and only provide the value of top dimension, carry out the technique of spacer moulding according to the value of known top dimension, in the situation that top dimension is known, can control the value of the spacer bottom size of formation by the technique of reasonable control formation spacer.Therefore, after top dimension is fixing, by the dimension difference at reasonable control interval column bottom and top, just can control the value of bottom size, also just can avoid accordingly the excessive liquid crystal deflection that causes of bottom size not good.
Inventor has found to cause the reason of IPS mode LCD light leak through long-term experiment, and find, can make IPS mode LCD there is good performance by distance x and the spacer bottom at control interval column bottom and light-shielding pattern edge with the dimension difference at top.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.
Fig. 3 is the cross-sectional view of color filter in the IPS mode LCD of the specific embodiment of the invention, and with reference to figure 3, the present invention, for the filter 30 of IPS mode liquid crystal display panel, comprising:
Be positioned at light-shielding pattern 32 and filter layer 33 on described substrate 31, described light-shielding pattern 32 and described filter layer 33 have overlapping region.Wherein, in the specific embodiment shown in Fig. 3, filter layer 33 is positioned on light-shielding pattern 32 and substrate 31, that is to say, first on substrate 31, forms light-shielding pattern 32, then filter layer 33 is formed on light-shielding pattern 32 and substrate 31.But in the present invention, the upper-lower position relation of light-shielding pattern and filter layer can be exchanged, and light-shielding pattern can be positioned on filter layer, that is to say, can first on substrate 31, form filter layer, then light-shielding pattern is formed on filter layer.
Be positioned at the spacer 35 on described flatness layer 36, and described spacer 35 is positioned at the top, overlapping region of filter layer 33 and light-shielding pattern 32, in parallel substrate surface direction, the distance x at described spacer 35 bottom margins and described light-shielding pattern 32 edges is more than or equal to 3 μ m, is less than or equal to 6 μ m.In this distance range, can reduce the bad problem of LCD alignment, when by after the array base palte of liquid crystal indicator and filter laminating, during to electrode application voltage, reduce liquid crystal indicator and show bad problem.
In specific embodiment, filter 30 also comprises: the screen layer 34 that is positioned at substrate 31 back sides.Optionally, the material of this screen layer 34 is ITO(tin indium oxide).
In the present invention, filter layer at least comprises R color filter layer, G color filter layer and B color filter layer, and the filter layer of adjacent two kinds of colors has lap with the overlapping region of light-shielding pattern, and described spacer is positioned at described lap top.In this specific embodiment, filter layer 33 comprises R color filter layer, G color filter layer and B color filter layer, on same light-shielding pattern, there is the filter layer of two kinds of colors, and the filter layer of adjacent two kinds of colors has lap on the overlapping region of light-shielding pattern and filter layer, spacer 35 is positioned at this lap top.The filter layer of three kinds of colors is arranged by the mode of RGB.But in the present invention, the color of filter layer is not limited to R, G, tri-kinds of colors of B, can be according to the color that filter layer need to be set of display device display color.
In specific embodiment, described spacer top dimension c is more than or equal to 5 μ m, is less than or equal to 20 μ m, and the difference a-c of the size a of spacer bottom and the size c at top is less than or equal to 5 μ m, and the distance at spacer bottom margin and light-shielding pattern edge is more than or equal to 3 μ m, be less than or equal to 6 μ m.Meeting in the dimension difference of spacer top and bottom and the distance situation at spacer bottom margin and light-shielding pattern edge, can better reduce the bad problem of LCD alignment.
In specific embodiment, the live width L of described light-shielding pattern is more than or equal to 15 μ m, is less than or equal to 25 μ m.The distance b of spacer 35 bottom surfaces and described light-shielding pattern 32 end faces, for being more than or equal to 2 μ m, is less than or equal to 5 μ m, can control protruding height by command range b.In the time that live width L, size c, the size a of spacer bottom at spacer top and difference a-c, the spacer bottom margin of the size c at top of light-shielding pattern all meet the condition in specific embodiment to the distance b of distance x, spacer 35 bottom surfaces and described light-shielding pattern 32 end faces at light-shielding pattern edge, can the bad problem of the little LCD alignment of extraordinary solution.
In specific embodiment, all spacers on filter can be highly identical, regardless of master space post and secondary spacer.Also the spacer on filter comprises master space post, secondary spacer, and the height of master space post is greater than the height of secondary spacer.
Inventor passes through a large amount of experiments and draws, spacer bottom margin to the distance at light-shielding pattern edge is more than or equal to 3 μ m, and while being less than or equal to 6 μ m, liquid crystal indicator does not almost have light leakage phenomena.Following table is experimental result
× × expression LCD alignment seriously bad × expression LCD alignment bad zero represents that LCD alignment is good
Filter taking light-shielding pattern live width as 20 μ m is the manufacture method of example explanation filter of the present invention below:
Step 1: first transparent glass substrate is removed to surface organic matter by ultraviolet light scrubber and water washer, then transparent glass substrate is dried in dehydration fever dish, be cooled to afterwards room temperature in cold dish.Then, BM photosensitive compoistion is coated on glass substrate with slit coater, uses heat dish to carry out thermal pretreatment at 90 DEG C of temperature, be 115s preheating time.Then, using the close induction type exposure machine that high-pressure mercury-vapor lamp is housed, is 50mJ/cm at exposure energy
2, exposure spacing (GAP) is under the condition of 180 μ m, BM photosensitive compoistion to be exposed.Exposed and implemented to develop with conveyance type developing apparatus afterwards, utilizing potassium hydroxide is that hydraulic pressure is set in 0.2Mpa by developer solution, development 48s(second), then clean with pure water, obtain the light-shielding pattern after developing.Then, at the temperature of 230 DEG C, toast 30min(minute with baking oven), carry out afterwards the cooling processing of 5 minutes, finally form with light-shielding pattern.Test by testing apparatus, confirm that light-shielding pattern live width is 20 μ m.
Step 2, forms after light-shielding pattern, the substrate with light-shielding pattern cleaned by ultraviolet scrubber and water washer, then, oven dry and cooling in dehydration plate; Then, on slit coater, red photonasty light blockage coating liquid is applied on substrate, can adjusts by adjusting slit discharge-amount the thickness of red sensitization coating layer.Then at 85 DEG C to red photonasty photoresistance prewarming baking 115s, afterwards, using the close induction type exposure machine of high-pressure mercury-vapor lamp is 45mJ/cm at exposure energy
2, exposure spacing (GAP) under 180 μ m conditions, red photonasty photoresistance is exposed, obtain predetermined figure.Afterwards, in developing apparatus with potassium hydroxide be developer solution taking the developer solution of 1.0% concentration by hydraulic pressure be set in 0.2MPa, development time develops under the condition of 45s.Then at the temperature of 230 DEG C, toast 30min with baking oven.Finally obtain R color filter layer.
Repeating step two forms G color filter layer, B color filter layer on filter.On light-shielding pattern two in the lap width of color filter layer be 2 μ m.
Step 3, after completing the moulding of RBG filter layer pattern, the ox horn height that overlaps region between pixel is higher, will exert an influence to the height of spacer and LCD alignment, thereby affect the performance performance of liquid crystal display.Therefore use the thermmohardening planarization material (OC of slit coater on filter layer surface-coated one deck flat pixels surface, over coat), under the condition of 90 DEG C/115 seconds, carry out prebake conditions, after prebake conditions, under 230 DEG C/20min condition, toast, finally form flatness layer.Then by magnetic control sputtering plating equipment substrate back sputter layer of transparent conductive film (ITO), thickness is 200 μ m.
Step 4, not only needs light-shielding pattern graph thinning technology in IPS display technique, also spacer miniaturization, two sections of changes have been proposed to requirement.Before spacer moulding, according to design experiences, under the measurable client's of obtaining specified altitude assignment, the top of spacer and the size of bottom are respectively 7 μ m, 10 μ m.Therefore in the time that spacer moulding designs with exposure mask plate, be 5um by spacer bottom margin apart from the spacing setting at light-shielding pattern edge.As step 2, by slit coater by water white photonasty light blockage coating on colored optical filtering substrates surface, under 90 DEG C/120s condition, carry out thermal pretreatment, in close induction type exposure machine, be then 44mJ/cm at exposure energy
2, exposure spacing is under 170 μ m conditions, to use above-mentioned exposure illumination and obtain miniaturization spacer by gray-tone mask (Gray-tone mask, be called for short GTM) technology, and it is poor between master space post and secondary spacer, to form the section of 0.5 μ m.By adjusting the adjustment of exposure technology parameter, the bottom size of realizing master space post, secondary spacer is 10 μ m, be configured in the overlapping region of filter layer and light-shielding pattern, the distance x of edge, acknowledgement interval column bottom to light-shielding pattern end is 5 μ m, finally by the baking of crossing 230 DEG C/30min, complete the production of colored optical filtering substrates.
Pass through above-mentioned steps, obtain the distance x=5 μ m of spacer bottom margin apart from light-shielding pattern end face, after filter and tft array substrate laminating, for having the fine liquid crystal indicator of good behaviour performance, the phenomenon ratios such as the light leak causing because orientation is bad after liquid crystal cell assembling are 0.
The present invention also provides a kind of liquid crystal indicator, comprises described filter.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and amendment to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection domain of technical solution of the present invention.
Claims (9)
1. for a filter for IPS mode liquid crystal display panel, it is characterized in that, comprising:
Substrate;
Be positioned at light-shielding pattern and filter layer on described substrate, described light-shielding pattern and described filter layer have overlapping region;
Flatness layer, covers described light-shielding pattern and filter layer;
Be positioned at the spacer on described flatness layer, and described spacer is positioned at the top, overlapping region of filter layer and light-shielding pattern, in parallel substrate surface direction, the distance at described spacer bottom margin and described light-shielding pattern edge is more than or equal to 3 μ m, is less than or equal to 6 μ m.
2. filter as claimed in claim 1, is characterized in that, described spacer top dimension is more than or equal to 5 μ m, is less than or equal to 20 μ m, and described spacer top and bottom size difference are less than or equal to 5 μ m.
3. filter as claimed in claim 2, it is characterized in that, described filter layer at least comprises R color filter layer, G color filter layer and B color filter layer, the filter layer of adjacent two kinds of colors has lap with the overlapping region of light-shielding pattern, and described spacer is positioned at described lap top.
4. filter as claimed in claim 1, is characterized in that, the live width of described light-shielding pattern is more than or equal to 15 μ m, is less than or equal to 25 μ m.
5. filter as claimed in claim 1, is characterized in that, the distance of described spacer bottom surface and described light-shielding pattern end face, for being more than or equal to 2 μ m, is less than or equal to 5 μ m.
6. filter as claimed in claim 1, is characterized in that, also comprises: the screen layer that is positioned at described substrate back.
7. filter as claimed in claim 6, is characterized in that, the material of described screen layer is ITO.
8. filter as claimed in claim 1, is characterized in that, described spacer comprises master space post, secondary spacer, and the height of described master space post is greater than the height of described secondary spacer.
9. a liquid crystal indicator, is characterized in that, comprises the filter described in claim 1-8 any one.
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| CN104459860A (en) * | 2014-12-10 | 2015-03-25 | 深圳市华星光电技术有限公司 | Method for manufacturing color filter, color filter and liquid crystal panel |
| CN104570183A (en) * | 2014-12-26 | 2015-04-29 | 深圳市华星光电技术有限公司 | Filter, LCD (liquid crystal display) panel and manufacture method of filter |
| CN105044967A (en) * | 2015-08-11 | 2015-11-11 | 武汉华星光电技术有限公司 | Color filter substrate, manufacturing method of color filter substrate and liquid crystal display panel with color filter substrate |
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| CN105044967A (en) * | 2015-08-11 | 2015-11-11 | 武汉华星光电技术有限公司 | Color filter substrate, manufacturing method of color filter substrate and liquid crystal display panel with color filter substrate |
| WO2017024655A1 (en) * | 2015-08-11 | 2017-02-16 | 武汉华星光电技术有限公司 | Colour filter substrate and manufacturing method therefor, and liquid crystal panel |
| CN108873449A (en) * | 2018-06-20 | 2018-11-23 | 昆山龙腾光电有限公司 | Colored optical filtering substrates and liquid crystal display device |
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