CN101916006A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN101916006A CN101916006A CN 201010253748 CN201010253748A CN101916006A CN 101916006 A CN101916006 A CN 101916006A CN 201010253748 CN201010253748 CN 201010253748 CN 201010253748 A CN201010253748 A CN 201010253748A CN 101916006 A CN101916006 A CN 101916006A
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Abstract
The invention provides a liquid crystal display device, which comprises a first substrate, a second substrate and a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein the side, facing the liquid crystal layer, of the first substrate is provided with a functional membrane layer which has a plurality of convex parts and/or concave parts and also provided with a flattened medium layer covering the functional membrane layer and a metal reflecting layer on the flattened medium layer. The functional membrane layer comprises one or more than two of a gate metal layer, a gate insulated layer, a semiconductor layer, a source-drain metal layer and an insulated protective layer. The liquid crystal display device and the manufacturing method thereof can avoid single-angle mirror reflection of a smooth plane to improve the reflectivity of diffuse reflection and expand a reflection view angle. In addition, compared with technology for improving backlight brightness, the method can ensure high visuality of a liquid crystal display used indoor and outdoor in the sun without increasing the overall power consumption of the liquid crystal display.
Description
Technical field
The present invention relates to technical field of flat panel display, particularly a kind of liquid crystal indicator and preparation method thereof.
Background technology
LCD (LCD) is as a kind of flat-panel monitor, have clear picture accurately, plurality of advantages such as thin thickness, in light weight, radiationless, low energy consumption and operating voltage be low, be applied in the every field widely at present.Usually, LCD has two substrates that contain electrode, and be arranged on liquid crystal layer between the two substrates, control the deflection that the electric field intensity that is applied to this liquid crystal layer is controlled liquid crystal molecule by the electrode on the two substrates, and then the transmissivity of adjustment incident light, to realize to the bright and dark control of display pixel.
(Thin Film Transistor, TFT) LCD has increasing use to thin film transistor (TFT) in the modern life, mobile phone display screen for example, Note Book display screen, MP3, MP4 display screen, GPS display screen, LCD-TV display screen etc.Along with the development of TFT-LCD technology, people are also more and more higher to its performance demands, not only require it to have good visuality when indoor light is softer, and also need it to have good visibility under the strong out of doors sunshine.
Common full-transparency type TFT LCD can not satisfy above-mentioned requirements, when using out of doors, because the strong reflection of sunlight, need to improve the surface brightness of TFT LCD, perhaps make one deck and reduce catoptrical material on the surface of TFT display screen, just can have good visuality, reach the requirement of using out of doors.As a rule, improving surface brightness can only be by improving the brightness of TFT LCD backlight, yet the raising of TFT liquid crystal display device backlight lightness has but increased the overall power of device, power system to device is had higher requirement, for example mobile phone must use high-octane battery could satisfy request for utilization.
So, how could under the situation that does not increase device power consumption, make the TFT LCD satisfy when using under the indoor and outdoor sunlight and all have good visuality, become the emphasis problem that these those skilled in the art pay close attention to.People have invented total reflection and semi-transparent semi TFT LCD in practice, and in total reflection and semi-transparent semi TFT LCD, its gordian technique is exactly how to promote reflectivity and spread reflection visual angle, in other words, to avoid the single angle direct reflection of smooth flat exactly.Therefore, the TFT LCD to total reflection or semi-transflective reflective type has the inevitable requirement that irreflexive structure just becomes market.
Summary of the invention
The problem that the present invention solves provides a kind of liquid crystal indicator with diffuse reflective structure, can promote irreflexive reflectivity.
For addressing the above problem, the invention provides a kind of liquid crystal indicator, comprising: first substrate, second substrate and be clipped in liquid crystal layer between described first substrate and second substrate, described first substrate has functional film layer towards the one side of described liquid crystal layer; Wherein, have a plurality of lug bosses and/or a plurality of depressed part in the described functional film layer; It is characterized in that, also comprise:
Be covered in planarized dielectric layer on the described functional film layer and the metallic reflector on the described planarized dielectric layer.
Described first substrate comprises reflector space and transmission region, and described planarized dielectric layer is positioned at reflector space.
The surface undulation degree of described planarized dielectric layer is less than the surface undulation degree of described functional film layer.
The thickness of described planarized dielectric layer is half of thickness that is positioned at the liquid crystal layer of viewing area outside the planarized dielectric layer.
Described functional film layer comprises the more than one or at least two combinations in gate metal layer, gate insulator, semiconductor layer, source-drain electrode metal level and the insulating protective layer.
In described a plurality of lug boss, the combination difference of the functional film layer that at least two lug bosses comprised;
And/or,
In described a plurality of depressed part, the combination difference of the functional film layer that at least two depressed parts comprised.
In described a plurality of lug boss, have difference in height between the adjacent lug boss, in described a plurality of depressed parts, adjacent depressed part has depth difference; Wherein, described planarized dielectric layer is covered on described a plurality of lug boss and a plurality of depressed part, and the surface undulation degree that described difference in height or depth difference are caused reduces.
Have thin film transistor region on described second substrate, described metallic reflector expands to described thin film transistor region top.
The functional film layer of adjacent protrusion portion is a complementary structure.
Described lug boss and/or depressed part are point-like, circle, ellipse, polygon, irregularly shaped or their combination.
Compared with prior art, technique scheme has the following advantages:
Liquid crystal indicator provided by the invention, by (for example being arranged in the liquid crystal panel, tft array substrate is towards liquid crystal layer one side) functional film layer in a plurality of lug bosses and/or a plurality of depressed part, thereby the side to light at tft array substrate forms diffuse reflective structure, can avoid the single angle direct reflection of smooth flat, be covered in its surface undulation degree of planarized dielectric layer on described a plurality of lug boss and/or a plurality of depressed part less than the surface undulation degree of lug boss and depressed part, can reach well-regulated mild transition, the metallic reflector that forms on the planarized dielectric layer just has more suitable surface gradient then, thereby improves irreflexive effect.
Description of drawings
Shown in accompanying drawing, above-mentioned and other purpose, feature and advantage of the present invention will be more clear.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing, focus on illustrating purport of the present invention by physical size equal proportion convergent-divergent.
Fig. 1 is the sectional view of liquid crystal indicator in the embodiment of the invention;
Fig. 2 is the part sectioned view of liquid crystal indicator tft array substrate in the embodiment of the invention;
Fig. 3 is the vertical view of liquid crystal indicator tft array substrate in the present embodiment;
Fig. 4 is the part sectioned view of liquid crystal indicator in the embodiment of the invention;
Fig. 5 is the vertical view of tft array substrate among Fig. 4.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Set forth a lot of details in the following description so that fully understand the present invention, implement but the present invention can also adopt other to be different from alternate manner described here, so the present invention has not been subjected to the restriction of following public specific embodiment.
Secondly, the present invention is described in detail in conjunction with synoptic diagram, when the embodiment of the invention is described in detail in detail; for ease of explanation; the sectional view of indication device structure can be disobeyed general ratio and be done local the amplification, and described synoptic diagram is example, and it should not limit the scope of protection of the invention at this.The three dimensions size that in actual fabrication, should comprise in addition, length, width and the degree of depth.
Just as described in the background section, has good visuality when using under the indoor and outdoor sunlight for making total reflection or semi-transparent semi TFT LCD satisfy, how when promoting reflectivity and spread reflection visual angle, not consume more power, become the emphasis problem of common concern in the industry.
The inventor discovers, can be by irreflexive structure being set to avoid the single angle direct reflection of smooth flat, based on this, the present invention proposes a kind of liquid crystal indicator and preparation method thereof, concaveconvex structure by being arranged at liquid crystal panel inside also covers the planarized dielectric layer on concaveconvex structure, avoid single angle direct reflection to form diffuse reflection, thereby promote irreflexive reflectivity and spread reflection visual angle.
Describe a specific embodiment of liquid crystal indicator of the present invention in detail below in conjunction with accompanying drawing, be outstanding characteristics of the present invention, do not provide in the accompanying drawing and the inevitable directly related part of inventive point of the present invention, for example, the pixel electrode of the concrete structure of liquid crystal molecule, colored filter substrate, tft array substrate, sweep trace and data line etc.
Fig. 1 is the sectional view of liquid crystal indicator in the present embodiment.As shown in Figure 1, described liquid crystal indicator comprises: the colored filter substrate that is oppositely arranged (also claims second substrate, down with) 20 and tft array substrate (also claim first substrate, down together) 10, be filled in the liquid crystal layer 107 between the two substrates, colored filter substrate 20 is first polaroid 120 on the one side of liquid crystal layer 107 dorsad, and tft array substrate 10 is the second polaroid (not shown) on the one side of liquid crystal layer 107 dorsad, and liquid crystal layer 107 is sealed in frame glue 101 between the two substrates.
Usually, liquid crystal indicator comprises viewing area and non-display area.Wherein, non-display area is positioned at the zone outside the viewing area.Liquid crystal layer 107 for example comprises TN type or STN type liquid crystal molecule, also can comprise the negative type liquid crystal molecule.
As shown in Figure 1, described colored filter substrate 20 comprises: second glass substrate 103, colour filter 108, black-matrix layer 109, common electrode layer 102; Wherein, described colour filter 108 is positioned at second glass substrate 103 on the one side of liquid crystal layer 107, and this colour filter 108 is made up of the red, green, blue color filter; Described black-matrix layer 109 is located between the red, green, blue color filter, and the red, green, blue color filter is spaced from each other; Described common electrode layer 102 covers colour filter 108 and black-matrix layer 109.
The tft array substrate 10 relative with described colored filter substrate 20 comprises: first glass substrate 100, cross one another data line that is provided with on the one side of liquid crystal layer 107 at described first glass substrate 100 and sweep trace (not shown) and by a plurality of pixel regions that data line and sweep trace limited; Described pixel region comprises pixel electrode 106, thin film transistor (TFT) 105 and memory capacitance (not shown).
Described tft array substrate 10 has the functional film layer (not shown) towards the one side of described liquid crystal layer; Wherein, have a plurality of lug bosses and/or a plurality of depressed part in the described functional film layer.Described functional film layer comprises the more than one or at least two combinations in gate metal layer, gate insulator, semiconductor layer, source-drain electrode metal level and the insulating protective layer.Circuit structures such as data line, sweep trace, thin film transistor (TFT) and memory capacitance in the described tft array substrate 10 also are made of the above-mentioned functions rete.
Liquid crystal indicator also comprises planarized dielectric layer and the metallic reflector on the described planarized dielectric layer, the below detailed description that is covered on the described functional film layer in the present embodiment.
Fig. 2 is the part sectioned view of tft array substrate in the present embodiment.As shown in the figure, adjacent lug boss A and lug boss B are positioned at the one side of first glass substrate 100 towards the liquid crystal layer (not shown), in other words, tft array substrate shown in the figure be positioned at not shown colored filter substrate below.Form depressed part C between described adjacent lug boss A and the lug boss B.
Lug boss A comprises gate metal layer 11, gate insulator 12, semiconductor layer 13 and source-drain electrode metal level 14 from bottom to top, also be, the functional film layer that constitutes lug boss A is the rhythmo structure of gate metal layer 11, gate insulator 12, semiconductor layer 13 and source-drain electrode metal level 14, has planarized dielectric layer 33 above the described functional film layer, also promptly, planarized dielectric layer 33 is covered on lug boss A, lug boss B and the depressed part C.
Lug boss B comprises gate metal layer 11, gate insulator 12, semiconductor layer 13, source-drain electrode metal level 14 and insulating protective layer 15; also promptly, the functional film layer of formation lug boss B is the rhythmo structure of gate metal layer 11, gate insulator 12, semiconductor layer 13, source-drain electrode metal level 14 and insulating protective layer 15.Because without any functional film layer, thereby form depressed part C between adjacent lug boss A and the lug boss B, its bottom is the surface of first glass substrate 100.
Described functional film layer covers planarized dielectric layer 33 towards the one side of liquid crystal layer, has metallic reflector 17 on the described planarized dielectric layer 33, in other words, planarized dielectric layer 33 is covered on lug boss A, B and the depressed part C, and metallic reflector 17 covers described planarized dielectric layer.The surface undulation degree of described planarized dielectric layer 33 is less than the surface undulation degree of described functional film layer, so can reach well-regulated mild transition, the metallic reflector 17 that forms on planarized dielectric layer 33 just has more suitable surface gradient then, thereby improves irreflexive effect.
Only show two lug bosses and a depressed part among Fig. 2, in fact, have a plurality of lug bosses and a plurality of depressed part in the described functional film layer of present embodiment, Fig. 3 is the vertical view of liquid crystal indicator tft array substrate in the present embodiment, as shown in Figure 3, a plurality of lug boss A1, A2 ... An arranges according to matrix form, a plurality of depressed part C1, C2 ... Cn also arranges according to matrix form, wherein, depressed part is between adjacent lug boss, and arrange lug boss and depressed part space.
Fig. 4 is the part sectioned view of liquid crystal indicator in the present embodiment, and Fig. 5 is the vertical view of tft array substrate among Fig. 4, and described tft array substrate comprises reflector space 61 and transmission region 51, and described planarized dielectric layer 33 is positioned at reflector space 61.Wherein reflector space 61 is coated with transparent planarized dielectric layer, 33 transmission regions 51 are the not covering of this planarized dielectric layer 33 then, so, utilizes the thickness of planarized dielectric layer, can effectively solve the problem of transmission region 51 and reflector space 61 optical path differences, thereby improve reflecting effect.Preferably, the thickness of described planarized dielectric layer is half of thickness that is positioned at the liquid crystal layer of viewing area outside the planarized dielectric layer.
As shown in Figure 5, described planarized dielectric layer 33 is arranged in reflector space 61, be covered in (gate metal layer 11, semiconductor layer 13 and source-drain electrode metal level 14 overlapping parts among the figure) on the TFT transistor, so utilize this planarized dielectric layer 33 can effectively reduce pixel electrode to data line 14 or to the coupling capacitance of gate line 11, so, metallic reflector 17 on the planarized dielectric layer 33 can cover the TFT transistor sites, can expand the area of pixel electrode like this, with the raising aperture opening ratio, thereby further improve reflectivity.
In the present embodiment, described each lug boss and/or depressed part are circular substantially, but are not limited to this, and among other embodiment of the present invention, each lug boss and/or depressed part also can be point-like, ellipse, polygon, irregularly shaped or their combination.The shape of each lug boss can be the same or different, and the shape of each depressed part can be the same or different, and the shape of lug boss and depressed part can be the same or different.
In the present embodiment, a plurality of depressed parts are positioned at the functional film layer on the tft array substrate, wherein, and the combination difference of the functional film layer that at least two depressed parts comprised.For example, depressed part C bottom is first glass substrate 100, and the bottom of another depressed part (not shown) that is adjacent is a gate metal layer, so, form depth difference between the adjacent depressed part, also can be formed with the spatial structure of stereovision, strengthen diffuse effect.And the depressed part that forms depth difference is not limited in position adjacent.
In the present embodiment, arrange depressed part and lug boss space, and in other words, depressed part is between two adjacent lug bosses, and boss is between two adjacent depressed parts.As optional mode, among other embodiment of the present invention, depressed part and lug boss are not limited to be spaced, depressed part and the lug boss specific distance of can being separated by, perhaps, in functional film layer, only have a plurality of lug bosses, also can in functional film layer, only have a plurality of depressed parts.
A plurality of lug boss A1, A2 ... An and a plurality of depressed part C1, C2 ... Cn is positioned at the NOT-circuit district, the alleged NOT-circuit district of this paper is meant, does not contain the viewing area of circuit structures such as sweep trace, data line, thin film transistor (TFT), memory capacitance and connecting through hole.For example, a plurality of rectangular areas of pixel electrode correspondence.
Preferably, the functional film layer of adjacent lug boss is a complementary structure in the present embodiment, and in other words, the area of adjacent protrusion portion corresponding crucial rete separately complements one another.As shown in Figure 2, ascending being followed successively by of each crucial rete area of lug boss A: gate metal layer 11, semiconductor layer 13, source-drain electrode metal level 14; Descending being followed successively by of each crucial rete area of lug boss B: gate metal layer 11, semiconductor layer 13, source-drain electrode metal level 14.That is to say that each crucial rete area of lug boss A increases gradually from bottom to top, and each crucial rete area of lug boss B reduces gradually from bottom to top.Wherein, " crucial rete " refer to superpose each rete of composition function rete, for example: gate metal layer, gate insulator, semiconductor layer, source-drain electrode metal level or insulating protective layer.Owing to for complimentary fashion designs, can reduce lug boss spacing each other between adjacent protrusion portion, make lug boss more dense, compact on arranging on the plane, thereby strengthen irreflexive effect.
Liquid crystal indicator in the present embodiment, by a plurality of lug bosses and/or a plurality of depressed part in the functional film layer that is arranged on (tft array substrate is towards the liquid crystal layer one side) in the liquid crystal panel, thereby the side to light at tft array substrate forms diffuse reflective structure, can avoid the single angle direct reflection of smooth flat, to promote irreflexive reflectivity and spread reflection visual angle.
And, can not increase the overall power of LCD with respect to the technology that improves backlight illumination, the requirement that all has good visibility in the time of just can satisfying use under the indoor and outdoor sunlight.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. liquid crystal indicator comprises: first substrate, second substrate and be clipped in liquid crystal layer between described first substrate and second substrate, and described first substrate has functional film layer towards the one side of described liquid crystal layer; Wherein, have a plurality of lug bosses and/or a plurality of depressed part in the described functional film layer; It is characterized in that, also comprise:
Be covered in planarized dielectric layer on the described functional film layer and the metallic reflector on the described planarized dielectric layer.
2. liquid crystal indicator according to claim 1 is characterized in that, described first substrate comprises reflector space and transmission region, and described planarized dielectric layer is positioned at reflector space.
3. liquid crystal indicator according to claim 2 is characterized in that, the surface undulation degree of described planarized dielectric layer is less than the surface undulation degree of described functional film layer.
4. according to each described liquid crystal indicator of claim 1-3, it is characterized in that the thickness of described planarized dielectric layer is half of thickness that is positioned at the liquid crystal layer of viewing area outside the planarized dielectric layer.
5. liquid crystal indicator according to claim 1 is characterized in that,
Described functional film layer comprises the more than one or at least two combinations in gate metal layer, gate insulator, semiconductor layer, source-drain electrode metal level and the insulating protective layer.
6. liquid crystal indicator according to claim 1 is characterized in that,
In described a plurality of lug boss, the combination difference of the functional film layer that at least two lug bosses comprised;
And/or,
In described a plurality of depressed part, the combination difference of the functional film layer that at least two depressed parts comprised.
7. liquid crystal indicator according to claim 6 is characterized in that, in described a plurality of lug bosses, has difference in height between the adjacent lug boss, and in described a plurality of depressed parts, adjacent depressed part has depth difference; Wherein, described planarized dielectric layer is covered on described a plurality of lug boss and a plurality of depressed part, and the surface undulation degree that described difference in height or depth difference are caused reduces.
8. liquid crystal indicator according to claim 6 is characterized in that, has thin film transistor region on described second substrate, and described metallic reflector expands to described thin film transistor region top.
9. liquid crystal indicator according to claim 1 is characterized in that, the functional film layer of adjacent protrusion portion is a complementary structure.
10. liquid crystal indicator according to claim 1 is characterized in that, lug boss and/or depressed part are point-like, circle, ellipse, polygon, irregularly shaped or their combination.
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