WO2011070866A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011070866A1 WO2011070866A1 PCT/JP2010/068998 JP2010068998W WO2011070866A1 WO 2011070866 A1 WO2011070866 A1 WO 2011070866A1 JP 2010068998 W JP2010068998 W JP 2010068998W WO 2011070866 A1 WO2011070866 A1 WO 2011070866A1
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- liquid crystal
- crystal display
- display device
- reflective
- pixel electrode
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
Definitions
- the present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device suitable for a reflective liquid crystal module.
- Liquid crystal display devices are widely used in electronic devices such as monitors, projectors, mobile phones, and personal digital assistants (PDAs), taking advantage of their thin and light weight and low power consumption.
- PDAs personal digital assistants
- a transmission type, a reflection type, a semi-transmission type (a reflection / transmission type), and the like are known.
- the transmissive liquid crystal display device performs display by guiding light from the back side of a backlight or the like provided on the back side of the liquid crystal display panel to the inside of the liquid crystal display panel and emitting it to the outside.
- the liquid crystal display device having a reflection type there are the reflection type and the semi-transmission type as described above. Is displayed only by being guided to the inside of the liquid crystal display panel and reflected, and has excellent visibility in a relatively bright environment such as outdoors.
- the transflective liquid crystal display device performs reflective display using light from the front side in a bright environment, and performs transmissive display using light from the back side in a relatively dark environment such as indoors. Is. That is, the reflective liquid crystal display device has both excellent visibility in a bright environment and the transmissive liquid crystal display device has excellent visibility in a dark environment.
- a liquid crystal display device having a reflection type function a liquid crystal display device that efficiently scatters external light within a limited reflective pixel electrode area and has a wide viewing angle and a high reflectance is desired.
- a reflection type liquid crystal display device in which a large number of fine convex portions are formed on a substrate and a relatively good reflectance can be obtained is disclosed (for example, see Patent Documents 1 and 2).
- the above-described liquid crystal display device has room for improvement in that the reflectance is sufficiently improved by a simple method.
- FIG. 14 is a schematic plan view showing the size of the reflective pixel electrode and the arrangement of the irregularities in the liquid crystal display device.
- the reflective pixel electrode 516 having a conventional size has a large reflective pixel electrode area, and has a large number of convex portions 568 (the number of concave and convex portions) arranged in the reflective pixel electrode for improving the reflectance.
- the high-definition reflective pixel electrode 514 has a smaller reflective pixel electrode area and a smaller number of protrusions 568, and the transflective reflective pixel electrode 512 is usually a reflective pixel electrode.
- the area is further smaller, and the number of the convex portions 568 arranged is still smaller (FIG. 14).
- the reflective electrode area per pixel is small. There was room for improvement to make a liquid crystal display device that is small but excellent in reflectivity.
- the present invention has been made in view of the above situation, and an object thereof is to provide a liquid crystal display device having a sufficiently improved reflectance.
- the inventors of the present invention have made various studies on a liquid crystal display device excellent in reflectance, and have focused on the size and arrangement location of the convex portions in the reflective pixel electrode. Then, it has been found that the conventional liquid crystal display device in which as many irregularities as possible are irregularly formed cannot sufficiently improve the reflectance. And by arranging predetermined irregularities inside the peripheral area of the reflective pixel electrode so that the inclined surface of the peripheral area of the reflective pixel electrode from the outer periphery of the reflective area can be effectively used as a scattering surface for external light, The inventors have found that a liquid crystal display device having a high reflectance can be manufactured, and have conceived that the above-mentioned problems can be solved brilliantly, and have reached the present invention.
- the present invention is a liquid crystal display device including a pair of substrates and a liquid crystal layer sandwiched between the pair of substrates, wherein at least one of the pair of substrates includes an insulating layer and a reflective display.
- a reflective pixel electrode to be used, and the insulating layer has a flat portion around the reflective pixel electrode, a convex portion under the reflective pixel electrode, and a gap between the flat portion and the convex portion.
- the convex portion has a slope portion that slopes downward from the flat portion, and the convex portion has an average diameter of 1 to 50 ⁇ m, and the height of the apex portion of the reflective pixel electrode layer provided on the convex portion is:
- the liquid crystal display device has a height equal to or higher than the flat portion.
- the liquid crystal display device of the present invention can use the inclined surface portion as a scattering surface of external light together with the reflection by the convex portion (uneven portion) in the reflective pixel electrode, and can be simply The reflectance can be improved.
- the flat portion is usually provided on the gate bus line and the source bus line, and in the transmissive region when there is a transmissive region.
- the average diameter of the convex portions is 1 to 50 ⁇ m. By setting it within this range, a good reflectance can be obtained.
- the average diameter of the convex portion means an average value of the maximum outer diameter and the minimum outer diameter of the convex portion when the substrate main surface is viewed in plan.
- the interval between the convex portions is preferably 1 to 10 ⁇ m. If it is less than 1 ⁇ m or exceeds 10 ⁇ m, the reflectivity may not be sufficient.
- the height of the apex portion of the reflective pixel electrode layer provided on the convex portion is equal to or higher than the height of the flat portion, based on the height from the main surface of the substrate having the insulating layer. This means that the height of the apex portion of the reflective pixel electrode layer provided on the surface is equal to or higher than the height of the flat portion of the insulating layer around the reflective pixel electrode. It is desirable that the height of the apex portion of the reflective pixel electrode layer be the same as the flat portion of the surrounding insulating layer.
- a transparent film is usually provided on the color filter (CF) side.
- the ITO electrode is formed on the upper layer, and the cell thickness of the reflection part is made half the cell thickness of the transmission part). At that time, if the convex portion becomes lower than the peripheral flat portion, it is necessary to increase the thickness of the transparent film accordingly.
- the distance between the flat part on the TFT substrate side and the transparent film on the CF side becomes extremely narrow, and a small protrusion (foreign matter or the like) tends to cause a leak between the TFT and the CF, resulting in point defects.
- the height of the apex of the convex portion is equal to or higher than the height of the flat portion.
- the convex portions are irregularly arranged in a region inside the slope portion in the reflective pixel electrode.
- the irregular arrangement of the protrusions is not limited to the case where the protrusions are arranged at regular intervals in the vertical or horizontal direction of the pixel. Thereby, it is possible to sufficiently prevent light interference.
- the angle of the reflecting surface that is efficient with respect to the reflection of outside light in other words, the angle of the slope and the convex is 30 ° to 60 °, more preferably 45 ° to 60 ° with respect to the main surface of the substrate. Is an angle. By setting it within such a range, the regular reflection component and the low-angle side reflection component can be distributed and reflected with good balance with respect to the front light. In addition, it is difficult to form a convex portion (concave / convex portion) finer than this in the current process.
- the reflective pixel electrode usually has a distance d (d is preferably 1 ⁇ m or more) from the outer periphery of the reflective region, the region that occupies a part of the flat portion when the main surface of the substrate is viewed in plan.
- An area extending to the inside also referred to as a reflection pixel electrode peripheral area in the present specification
- an area inside the distance d from the outer periphery of the reflection area is also referred to as a reflection pixel electrode peripheral area in the present specification.
- the configuration of the liquid crystal display device of the present invention is not particularly limited by other components as long as such components are essential. A preferred embodiment of the liquid crystal display device of the present invention will be described in detail below.
- the slope portion may be provided in an amount of 1 ⁇ m or more from the end of the flat portion when the substrate main surface is viewed in plan.
- region which has a larger influence regarding scattering of external light to the distance d inside can be taken, and a reflectance can be improved more.
- the area of one reflection region in one pixel is four times or more the average area of one or more convex portions provided in the one reflection region. Is mentioned. Thereby, the reflectance can be further improved.
- the area of the one reflection region means the area of the portion occupied by only one reflection region when there is only one reflection region in one pixel when the substrate main surface is viewed in plan view.
- a reflective region When a reflective region is divided into two or more in one pixel, it means an area of a portion occupied by one of the divided reflective regions.
- the average area of the protrusions is provided in one or more reflection areas (one reflection area in the pixel or one of the reflection areas divided into two or more in the pixel). The average value per convex part of the convex part area is said.
- the liquid crystal display device of the present invention is a form in which the area of one reflection region in one pixel is less than four times the area of only one protrusion provided in the one reflection region. Can be mentioned. Thereby, the reflectance can be further improved.
- the liquid crystal display device of the present invention is a transflective liquid crystal display device in which a reflective region is divided into two or more in one pixel. Is particularly preferable in that it can be made sufficiently high.
- liquid crystal display device of the present invention can be particularly suitably applied to a high-definition liquid crystal display device and / or a transflective liquid crystal display device.
- the upper limit of the pixel pitch in the longitudinal direction of the pixel is preferably 200 ⁇ m or less. More preferably, it is 170 ⁇ m or less.
- the lower limit is preferably 50 ⁇ m or more. More preferably, it is 100 ⁇ m or more.
- the upper limit of the pixel pitch in the short direction of the pixel is preferably 60 ⁇ m or less. More preferably, it is 50 ⁇ m or less.
- the lower limit is preferably 20 ⁇ m or more. More preferably, it is 30 ⁇ m or more.
- the pixel pitch refers to the length per pixel in the pixel row, for example, the distance between the midpoints of the long sides of the pixels in the longitudinal direction of the pixels, or the shortness of the pixels in the short direction of the pixels. This is the distance between the midpoints of the sides.
- the reflectance can be sufficiently improved.
- FIG. 1 is a schematic cross-sectional view of a reflective liquid crystal display device according to Embodiment 1.
- FIG. 3 is a schematic plan view showing a reflective pixel electrode of a TFT substrate of the reflective liquid crystal display device according to Embodiment 1.
- FIG. 3 is a schematic plan view illustrating pixels of a reflective liquid crystal display device according to Embodiment 1.
- FIG. 4 is a schematic cross-sectional view along the line AA ′ in FIG. 3.
- FIG. 4 is a schematic cross-sectional view along the line BB ′ in FIG. 3. It is a cross-sectional schematic diagram which shows the convex part of a liquid crystal display device.
- 6 is a schematic plan view illustrating pixels of a transflective liquid crystal display device according to a modification of Embodiment 1.
- FIG. 9 is a schematic diagram illustrating a difference in height of reflective pixel electrodes in a transflective liquid crystal display device according to a modification of the first embodiment. It is a plane schematic diagram which shows arrangement
- the “reflection region” refers to a region (area) where the reflective pixel electrode is disposed inside the insulating layer flat portion when the main surface of the substrate is viewed in plan.
- the “transmission area” refers to an area that contributes to transmissive display. That is, light used for transmissive display passes through the liquid crystal layer in the transmissive region, and light used for reflective display passes through the liquid crystal layer in the reflective region.
- the transflective liquid crystal display device has the reflective region and the transmissive region.
- “reflective pixel electrode” refers to an electrode provided for driving a liquid crystal used for reflective display.
- the substrate having the reflective pixel electrode in the reflective liquid crystal display device and the substrate having both the transmissive and reflective pixel electrodes in the transflective liquid crystal display device are usually substrates on which TFTs are disposed, Also called TFT side substrate. Further, since the substrate facing the TFT substrate is usually a substrate on which a color filter (CF) is disposed, it is also referred to as a CF side substrate.
- CF color filter
- FIG. 1 is a schematic cross-sectional view of a reflective liquid crystal display device according to the first embodiment.
- FIG. 2 is a schematic plan view showing the reflective pixel electrode of the TFT substrate of the reflective liquid crystal display device according to the first embodiment.
- the reflective liquid crystal display device according to the first embodiment wires source bus lines 42 and gate bus lines 52 across the upper layer of the glass substrate 12 and switches to the intersections.
- a thin film transistor to be an element is formed, and a substrate (TFT substrate) having a reflective pixel electrode 34 and an insulating layer (resin layer having a thickness of 2 to 5 ⁇ m) 36 arranged in a matrix, a common electrode 20 and RGB (red, red, A liquid crystal layer 32 is sandwiched between a counter electrode side substrate (CF substrate) having a green / blue color filter 24.
- a retardation plate 26 and a polarizing plate 28 are laminated on the display surface side of the glass substrate 22 on the CF substrate side. Note that the gate electrode 13, the source electrode 11, and the drain electrode 15 of the thin film transistor are connected to the gate bus line 52 and the source bus line 42, respectively.
- the TFT substrate has an insulating layer 36 on the upper layer of the gate electrode 13, the source electrode 11, the drain electrode 15, the source bus line 42, and the gate bus line 52 (the upper layer of the glass substrate 12 when no electrode and wiring are arranged).
- the insulating layer 36 has a convex portion under the reflective pixel electrode 34 (a metal film having good reflectivity: aluminum or silver is preferable). Thereby, a reflective area can be enlarged.
- the reflective pixel electrode 34 is electrically connected to the lower drain electrode 15 through the contact hole 30.
- the insulating layer 36 has a flat portion 38 around the reflective pixel electrode 34, and further has a slope portion inclined downward from the flat portion between the flat portion 38 and the convex portion.
- the average diameter of the convex portions is 1 to 50 ⁇ m. Preferably, it is 8 to 20 ⁇ m.
- the average diameter of the convex portion means an average value of the maximum outer diameter and the minimum outer diameter of the convex portion when the substrate main surface is viewed in plan.
- the interval between the convex portions is 1 to 10 ⁇ m.
- the height of the apex portion of the reflective pixel electrode layer 34 provided on the convex portion is higher than the height of the flat portion 38.
- the height of the apex portion of the reflective pixel electrode layer 34 provided on the convex portion may be the same as the height of the flat portion.
- FIG. 3 is a schematic plan view illustrating pixels of the reflective liquid crystal display device according to the first embodiment.
- FIG. 4 is a schematic sectional view taken along the line AA ′ in FIG.
- FIG. 5 is a schematic sectional view taken along the line BB ′ in FIG.
- the area of the reflection region 64 shown in FIG. 3 is four times or more the average area of the projections 68 provided in the reflection region 64, and the projections 68 extend from the outer periphery of the reflection region 64 (flat portion of the insulating layer). They are irregularly arranged in the region 66 inside the distance d (d is 1 ⁇ m or more).
- the convex portions 68 are irregularly arranged in a region 1 ⁇ m or more inside from the outer periphery of the reflective region 64 in FIG.
- the convex portion 68 by arranging the convex portion 68 in the region 1 ⁇ m or more from the outer periphery of the reflective region 64, the slope portion 72 inclined downward from the flat portion as shown in FIGS. 4 and 5 is formed from the end portion of the flat portion. 1 ⁇ m or more is provided, and the reflectance can be improved by effectively using the inclined surface portion 72 as a scattering surface for external light.
- the convex portions 68 irregularly it is possible to sufficiently prevent light interference. As shown in FIGS.
- the insulating layer 36 has a substantially same convex portion 68 (uneven portion) continuously.
- the concavo-convex portion preferably has a comb structure.
- the angle of the slope part 72 and the convex part 68 which incline below from a flat part is 30 degrees or more with respect to a board
- the convex portion 68 (concave portion) is disposed in a region 1 ⁇ m or more from the outer periphery of the reflective region 64, and the manufacturing method thereof is as follows.
- a convex portion 68 and a slope portion 72 inclined downward from the flat portion between the flat portion and the convex portion 68 are formed, and the upper layer has good reflectivity.
- a reflective film electrode 34 is formed by sputtering a metal film and performing pattern formation by photolithography. That is, the insulating layer 36 has a structure having a convex portion 68 below the reflective pixel electrode 34.
- the gap between the reflective regions where the reflective pixel electrode 34 is not formed (the source bus line and the gate bus line when the main surface of the substrate is viewed in a plan view, and the region overlapping with the transmissive region when there is a transmissive region) is insulated.
- Layer 36 remains flat (flat portion 38 of insulating layer 36).
- the reflective pixel electrode 34 has a structure surrounded by the flat portion 38, in other words, the insulating layer 36 has a flat portion around the reflective pixel electrode 34. As shown in FIGS. 4 and 5, the reflective pixel electrode 34 may be disposed on a part of the flat portion 38.
- FIG. 6 is a schematic cross-sectional view showing the convex portion of the liquid crystal display device.
- the area of the convex portion is not the area of the apex portion of the convex portion, but the plane of the substrate main surface in the region including the inclined portion constituting the convex portion (the region indicated by a in FIG. 6). The area when viewed.
- FIG. 7 is a schematic plan view showing pixels of a transflective liquid crystal display device according to a modification of the first embodiment.
- FIG. 8 is a schematic diagram showing the height difference of the reflective pixel electrodes in the transflective liquid crystal display device according to the modification of the first embodiment.
- a reflective region 164 indicated by a one-dot chain line is divided into three in one pixel.
- One of the divided reflective regions 164 is provided with three convex portions 168, and the area of the reflective region 164 is more than four times the average area of the convex portions 168 provided in the reflective region 164 in that region.
- the convex portions 168 are irregularly arranged inside the distance d (d is 1 ⁇ m or more) from the flat portion of the insulating layer (the outer periphery of the reflection region). Note that the average area of the protrusions 168 is one or more provided in the reflection region (only one reflection region in the pixel or one of the reflection regions divided into two or more in the pixel). The average value per convex part of the convex part area is said.
- the remaining two divided reflection regions 164 are provided with only one convex portion 168.
- the area of the reflective region 164 is less than four times the area of the convex portion 168 provided in the reflective region 164, and from the central portion of the reflective pixel electrode and the flat portion of the insulating layer (the outer periphery of the reflective region).
- One projection 168 is formed inside the distance d (d is 1 ⁇ m or more). In the present embodiment, the reflectance can be further improved by adopting such a form.
- FIG. 13 a schematic diagram showing the height difference of the reflective pixel electrodes is measured.
- an improvement of about 7% was confirmed in the transflective liquid crystal display device of the present invention.
- a slope portion inclined downward from a flat portion provided at a distance d also referred to as a reflection pixel electrode peripheral region
- a convex portion 468 provided at a distance d from the outer periphery of the reflection region is greater than that of the inclined portion.
- the convex portions are irregular in the inner region of 1 ⁇ m or more from the flat portion of the insulating layer (the outer periphery of the reflective region). Deploy.
- one convex portion is provided in the central portion of the reflective pixel electrode 34 and in a region 1 ⁇ m or more from the flat portion of the insulating layer. Form one.
- FIG. 9 is a schematic plan view showing the arrangement of irregularities in the reflective pixel electrode according to one embodiment of the present invention.
- the reflective region 264 is provided with a convex portion 268a.
- the area of the reflective region 264 is four times or more than the average area of the convex portion 268a provided in the reflective region 264, and the flat portion (reflective portion) of the insulating layer is provided.
- the convex portions 268a are irregularly arranged in a region (region 266) that is 1 ⁇ m or more from the outer periphery of the region. This is an example of the above (1).
- FIG. 10 is a schematic plan view showing the arrangement of irregularities in the reflective pixel electrode according to one embodiment of the present invention.
- FIG. 11 is a schematic sectional view taken along the line AA ′ in FIG. Two substantially identical recesses are formed, and an inclined surface 372 inclined downward from the flat portion is provided on the outer periphery side of the reflection region (in other words, 1 ⁇ m or more from the outer periphery of the reflection region).
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Abstract
Description
反射画素電極層の頂点部の高さが、その周囲の絶縁層の平坦部と同じ高さにすることが望ましい。なぜなら、例えば半透過機種においては、透過部と反射部の光路長(又はΔn・d)をあわせるため(透過セル厚=反射セル厚×2)、通常はカラーフィルター(CF)側に透明の膜を形成する必要がある(その上層にITO電極を形成し、反射部のセル厚を透過部のセル厚の半分にする)。そのとき、凸部が周辺の平坦部よりも低くなると、その分透明膜の膜厚を高くする必要が生じる。そうすると、例えばTFT基板側の平坦部とCF側の透明膜との距離が極端に狭くなってしまい、小さな突起物(異物等)によって、TFTとCF間でリークが発生しやすく、点欠陥不良になる。以上のことから、凸部の頂点の高さは平坦部の高さ以上が望ましい。
外光の反射に対して効率的な反射面の角度、言い換えれば、上記斜面部及び凸部の角度は、基板主面に対して、30°~60°、より好ましくは45°~60°の角度である。このような範囲内とすることにより、正面光に対して、正反射成分と低角度側反射成分をバランスよく配分して反射させることができる。
なお、これ以上細かい凸部(凹凸部)は、現状のプロセスにおいては形成が困難となる。
本発明の液晶表示装置における好ましい形態について以下に詳しく説明する。
反射型液晶表示装置における反射画素電極を有する基板、及び、半透過型液晶表示装置における透過部と反射部との両画素電極を有する基板は、通常はTFTが配置される基板であることから、TFT側基板ともいう。またTFT基板に対向する基板は、通常はカラーフィルタ(CF)が配置される基板であることから、CF側基板ともいう。
図1は、実施形態1に係る反射型の液晶表示装置の断面模式図である。
図2は、実施形態1に係る反射型の液晶表示装置のTFT基板の反射画素電極を示す平面模式図である。
実施形態1に係る反射型液晶表示装置は、図1及び図2に示されるように、ガラス基板12の上層にソースバスライン42とゲートバスライン52とを交差して配線し、その交点にスイッチング素子となる薄膜トランジスタを形成し、マトリクス状に配置された反射画素電極34及び絶縁層(膜厚2~5μmの樹脂層が好ましい)36を有する基板(TFT基板)と共通電極20及びRGB(赤・緑・青)カラーフィルター24を有する対向電極側の基板(CF基板)とで液晶層32を挟持する。CF基板側のガラス基板22の表示面側には、位相差板26及び偏光板28が積層されている。なお、薄膜トランジスタのゲート電極13と、ソース電極11及びドレイン電極15とは、それぞれ、ゲートバスライン52とソースバスライン42とに接続されている。
図4は、図3中のA-A′線に沿った断面模式図である。
図5は、図3中のB-B′線に沿った断面模式図である。
図3に示される反射領域64の面積は、反射領域64に設けられた凸部68の平均面積の4倍以上であり、凸部68は、反射領域64の外周(絶縁層の平坦部)から距離d(dは、1μm以上である)内側の領域66に不規則配置されている。すなわち、凸部68は、図3における反射領域64の外周から1μm以上内側の領域に不規則配置されている。このように反射領域64の外周から1μm以上内側の領域に凸部68を配置することにより、図4及び図5に示すように平坦部から下方に傾斜する斜面部72が平坦部の端部から1μm以上設けられ、斜面部72を効果的に外光の散乱面として利用して反射率を向上することができる。また、凸部68を不規則配置することにより、光の干渉を充分に防ぐことができる。
図4及び図5に示すように、絶縁層36は、略同一の凸部68(凹凸部)を連続的に有する形態が好ましい。言い換えれば、凹凸部が櫛形構造であることが好ましい。また、平坦部から下方に傾斜する斜面部72及び凸部68の角度は、基板主面に対して、30°以上である。
本明細書中、凸部の面積は、凸部の頂点部分の面積ではなく、凸部を構成する傾斜部分を含めた領域(図6中、aで示される領域)について、基板主面を平面視したときの面積をいう。
図8は、実施形態1の変形例に係る半透過型の液晶表示装置における反射画素電極の高低差を示す模式図である。
実施形態1の変形例の半透過型液晶表示装置は、一点鎖線で示される反射領域164が1つの画素内で3つに分割されている。分割された反射領域164の1つには凸部168が3つ設けられ、当該領域においては、反射領域164の面積が反射領域164に設けられた凸部168の平均面積の4倍以上であり、絶縁層の平坦部(反射領域の外周)から距離d(dは、1μm以上である)内側に凸部168を不規則配置する。なお、凸部168の平均面積とは、反射領域(画素内の1つのみの反射領域、又は、画素内で2つ以上に分割された反射領域の中の1つ)に1つ以上設けられた凸部面積の凸部1つ当たりの平均値をいう。
図10は、本発明の一実施形態に係る反射画素電極における凹凸の配置を示す平面模式図である。反射領域364には凸部368が1つのみ設けられている。当該領域においては、反射領域364の面積が反射領域364に設けられた凸部368の面積の4倍未満であり、反射画素電極中央部でかつ、絶縁層の平坦部(反射領域の外周)から1μm以上内側の領域(領域366)に凸部368を1つ形成する。これは、上記(2)の形態の一例を示したものである。
図11は、図10中のA-A′線に沿った断面模式図である。略同一の凹部が2つ形成され、それぞれの反射領域外周側(言い換えれば、反射領域の外周から1μm以上)に、平坦部から下方に傾斜する斜面372が設けられている。
12、22:ガラス基板
13:ゲート電極
15:ドレイン電極
20:共通電極
24:RGBカラーフィルター
26:位相差板
28:偏光板
30:コンタクトホール
32:液晶層
34:反射画素電極
36:絶縁層
38:平坦部
42、142、142、442:ソースバスライン
52、152、152、452:ゲートバスライン
62:凹凸領域
64、164、264、364、464:反射領域
66、166、266、366、466:反射領域の外周から距離d内側の領域
68、168、268、368、468、568:凸部
72、372:平坦部から下方に傾斜する斜面部
512:半透過型の反射画素電極
514:高精細の反射画素電極
516:従来の大きさの反射画素電極
Claims (4)
- 一対の基板と、該一対の基板間に挟持された液晶層とを備えた液晶表示装置であって、
該一対の基板の少なくとも一方は、絶縁層、及び、反射表示に用いられる反射画素電極を有し、
該絶縁層は、反射画素電極の周囲に平坦部を有し、反射画素電極下に凸部を有し、更に、該平坦部と該凸部との間に該平坦部から下方に傾斜する斜面部を有し、
該凸部は、その平均径が1~50μmであり、
該凸部の上に設けられた反射画素電極層の頂点部の高さが、該平坦部の高さ以上である
ことを特徴とする液晶表示装置。 - 前記斜面部は、基板主面を平面視したときに、前記平坦部の端部から1μm以上設けられている
ことを特徴とする請求項1に記載の液晶表示装置。 - 前記液晶表示装置は、1画素内の1つの反射領域の面積が、該1つの反射領域に1つ以上設けられた凸部の平均面積の4倍以上である
ことを特徴とする請求項1又は2に記載の液晶表示装置。 - 前記液晶表示装置は、1画素内の1つの反射領域の面積が、該1つの反射領域に1つのみ設けられた凸部の面積の4倍未満である
ことを特徴とする請求項1又は2に記載の液晶表示装置。
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US13/512,029 US20120281171A1 (en) | 2009-12-08 | 2010-10-26 | Liquid crystal display device |
JP2011545144A JP5425935B2 (ja) | 2009-12-08 | 2010-10-26 | 液晶表示装置 |
CN201080055723.1A CN102667587B (zh) | 2009-12-08 | 2010-10-26 | 液晶显示装置 |
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CN115774349B (zh) * | 2022-11-18 | 2024-07-19 | Tcl华星光电技术有限公司 | 显示面板及显示面板的制造方法 |
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JP2002328211A (ja) * | 2000-07-28 | 2002-11-15 | Matsushita Electric Ind Co Ltd | 反射板及びその製造方法、並びにそれを用いた表示装置 |
JP2009163273A (ja) * | 2009-04-23 | 2009-07-23 | Mitsubishi Electric Corp | 反射型液晶表示装置の製法 |
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US7215393B2 (en) * | 2000-07-28 | 2007-05-08 | Matsushita Electric Industrial Co., Ltd. | Reflective plate and display device using the plate |
JP2008003442A (ja) * | 2006-06-26 | 2008-01-10 | Mitsubishi Electric Corp | 液晶表示装置 |
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- 2010-10-26 CN CN201080055723.1A patent/CN102667587B/zh not_active Expired - Fee Related
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JP2002328211A (ja) * | 2000-07-28 | 2002-11-15 | Matsushita Electric Ind Co Ltd | 反射板及びその製造方法、並びにそれを用いた表示装置 |
JP2009163273A (ja) * | 2009-04-23 | 2009-07-23 | Mitsubishi Electric Corp | 反射型液晶表示装置の製法 |
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JP5425935B2 (ja) | 2014-02-26 |
CN102667587A (zh) | 2012-09-12 |
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