WO2010073427A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2010073427A1 WO2010073427A1 PCT/JP2009/003743 JP2009003743W WO2010073427A1 WO 2010073427 A1 WO2010073427 A1 WO 2010073427A1 JP 2009003743 W JP2009003743 W JP 2009003743W WO 2010073427 A1 WO2010073427 A1 WO 2010073427A1
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- liquid crystal
- crystal display
- display surface
- region
- display device
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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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
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
- G02F1/133555—Transflectors
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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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
- G02F1/1323—Arrangements for providing a switchable viewing angle
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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
- G02F1/133391—Constructional arrangement for sub-divided displays
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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
- G02F2203/00—Function characteristic
- G02F2203/02—Function characteristic reflective
Definitions
- the present invention relates to a liquid crystal display device.
- the transmissive liquid crystal display device is configured to transmit light from a backlight to a liquid crystal display panel formed by bonding a pair of substrates and perform image display using the transmitted light.
- a reflection type and a transflective liquid crystal display device are conventionally known.
- the reflection type liquid crystal display device is configured to reflect the light of the front light and the external light incident on the liquid crystal display panel on a substrate opposite to the incident side and display an image by the reflected light.
- the transflective liquid crystal display device is configured to display an image using both the transmitted light and the reflected light.
- a reflective layer for reflecting light is provided for each pixel of the liquid crystal display panel.
- the surface of each of these reflective layers is formed in a uniform concavo-convex shape in each pixel in order to scatter light incident from the surroundings and reflect it uniformly on the front side of the liquid crystal display device, in order to enable bright display
- the concavo-convex shape of each reflective layer is configured so that the reflectance of light in the normal direction of the display surface is relatively high (see, for example, Patent Document 1).
- the present invention has been made in view of such points, and an object of the present invention is to improve display quality by suppressing variation in luminance in a curved liquid crystal display device.
- the reflection layer provided for each pixel has a reflectance in the normal direction of the display surface of the light reflected by each of the reflection layers so that the reflection direction of the display surface is curved. It was made to comprise so that it might become higher than the center part of the curve direction in both ends.
- a liquid crystal display device includes a first substrate in which a plurality of pixels are defined and a reflective layer is provided for each pixel, and a second substrate disposed opposite to the first substrate. And a display surface for displaying an image by each of the pixels, wherein the display surface is curved in one direction, wherein each of the reflective layers is the display surface of the light reflected by each of the reflective layers.
- the display surface is configured such that the reflectance in the normal direction is higher at both ends in the bending direction than at the center in the bending direction on the display surface.
- the bending direction is a direction along the bending of the display surface.
- each of the reflective layers has a reflectance in the normal direction of the display surface of light reflected by each of the reflective layers so as to be higher at the both ends of the curved direction on the display surface than at the central portion in the curved direction. It is configured. As a result, the reflectance of the light reflected by each reflective layer to the front side of the liquid crystal display device is increased at both ends in the bending direction on the display surface with respect to the central portion in the bending direction. In the apparatus, variations in luminance are suppressed, and display quality is improved.
- Each of the reflective layers has a concavo-convex surface, and the concavo-convex shape of each of the reflective layers is such that the reflectance of each of the reflective layers is higher than the center of the curved direction at both ends in the curved direction on the display surface. You may be comprised so that it may become high.
- each reflective layer causes the reflectance in the normal direction of the display surface in each reflective layer to be higher at the both ends of the curved direction on the display surface than at the center in the curved direction.
- the display area formed by the plurality of pixels is provided in a central portion of the display surface in the bending direction, and a first area where the reflectance of each reflective layer is a first reflectance, and both sides of the first area
- the reflectance of light in the normal direction of the display surface in each reflective layer increases stepwise from the central portion in the bending direction toward the both ends in the bending direction on the display surface.
- variation in luminance is satisfactorily suppressed.
- Each of the pixels may have a reflective region in which the reflective layer is provided and a transmissive region in which the reflective layer is not provided.
- each pixel has a reflective region and a transmissive region.
- the uneven shape of each reflective layer may be configured such that the reflectance of each reflective layer is lower on the peripheral side of the display surface than on the front side of the display surface.
- the image display is visually recognized from the peripheral side of the display surface. It becomes difficult. In this way, by visually degrading the visibility on the peripheral side of the display surface so that only the user on the front side can see it, it is possible to prevent others from seeing the display.
- the reflection layer provided for each pixel has a reflectance in the normal direction of the display surface of the light reflected by each of the reflection layers at the both ends of the curve direction on the display surface. Since it is configured to be higher than the central portion, in a curved liquid crystal display device, variations in luminance can be suppressed and display quality can be improved.
- FIG. 1 is a plan view schematically showing the liquid crystal display device according to the first embodiment.
- FIG. 2 is a cross-sectional view schematically showing the liquid crystal display device along the line II-II in FIG.
- FIG. 3 is a plan view schematically showing a display area of the liquid crystal display panel.
- FIG. 4 is a plan view schematically showing a part of the thin film transistor substrate of the first embodiment.
- FIG. 5 is a cross-sectional view of a portion corresponding to the position along the line XX of FIG. 4 in the first region of the first embodiment.
- 6 is a cross-sectional view of a portion corresponding to a position along the line XX in FIG. 4 in the second region of the first embodiment.
- FIG. 7 is a cross-sectional view of a portion corresponding to the position along the line XX in FIG. 4 in the third region of the first embodiment.
- FIG. 8 is a plan view schematically showing a part of the thin film transistor substrate of the second embodiment.
- FIG. 9 is a cross-sectional view of a portion corresponding to a position along line YY in FIG. 8 in the first region of the second embodiment.
- FIG. 10 is a cross-sectional view of a portion corresponding to a position along line YY in FIG. 8 in the second region of the second embodiment.
- FIG. 11 is a cross-sectional view of a portion corresponding to a position along the YY line of FIG. 8 in the third region of the second embodiment.
- FIG. 12 is a perspective view schematically showing the liquid crystal display device of the third embodiment.
- FIG. 13 is a plan view schematically showing a part of the thin film transistor substrate of the fourth embodiment.
- FIG. 1 is a perspective view schematically showing a liquid crystal display device S of the present embodiment.
- FIG. 2 is a cross-sectional view schematically showing the liquid crystal display device S along the line II-II in FIG.
- FIG. 3 is a plan view schematically showing the display area 2 of the liquid crystal display panel 1.
- FIG. 4 is a plan view schematically showing a part of the thin film transistor substrate 10.
- 5 to 7 are cross-sectional views of portions corresponding to positions along the line XX in FIG. 4 in each of the areas A, B, and C of the display area 2. In FIG. 1, the polarizing plates 43 and 44 are not shown.
- the liquid crystal display device S includes a liquid crystal display panel 1 and a backlight 5 disposed on the back side (lower side in FIG. 2) of the liquid crystal display panel 1.
- the liquid crystal display panel 1 is configured by bonding a thin film transistor substrate 10 as a first substrate and a color filter substrate 30 as a second substrate disposed on the backlight 5 side so as to face each other through a liquid crystal layer 40. ing.
- the display region 2 is configured in a portion where the thin film transistor substrate 10 and the color filter substrate 30 face each other with the liquid crystal layer 40 interposed therebetween, and an image is displayed on the surface of the display region 2 on the color filter substrate 30 side.
- a display surface 2s for displaying is provided.
- the substrates 10 and 30 constituting the liquid crystal display panel 1 have flexibility, and the liquid crystal display panel 1 is fixed in a deformed state as a whole.
- the liquid crystal display panel 1 has one direction (in the drawing) over the entire long side direction (lateral direction in the drawing) so that the display surface 2 s becomes a concave curved surface.
- the curvature of the display surface 2s is, for example, about 1/500 to 1/50 (1 / mm).
- the arrows in FIG. 1 indicate the bending direction of the liquid crystal display panel 1 (display surface 2s).
- the bending direction means a direction along the bending of the liquid crystal display panel 1.
- the liquid crystal display panel 1 is curved in the long side direction, but the liquid crystal display panel 1 may be curved in the short side direction (vertical direction in FIG. 1).
- the liquid crystal display panel 1 is not limited to the above-described one, and the rectangular display surface 2s may be configured to bend in an oblique direction.
- the thin film transistor substrate 10 and the color filter substrate 30 are formed in, for example, a rectangular shape or the like. As shown in FIG. 2, alignment films 41 and 42 are provided on the surface on the liquid crystal layer 40 side. Polarizing plates 43 and 44 are provided on the opposite surface. Between the thin film transistor substrate 10 and the color filter substrate 30, a frame-shaped sealing material 45 made of epoxy resin or the like is provided so as to surround the display region 2, and a liquid crystal material is enclosed inside the sealing material 45. Thus, the liquid crystal layer 40 is configured.
- the liquid crystal display device S of the present embodiment is a transflective liquid crystal display device, and each pixel 11 transmits light from the backlight 5 and a reflective region 11r that reflects external light incident from the color filter substrate 30 side.
- the reflective region 11r is arranged on the upper side in the column direction (vertical direction in FIG. 4) of each pixel 11, and the transmissive region 11t is below the reflective region 11r in the column direction of each pixel 11. Arranged on the side.
- This thin film transistor substrate 10 has a thin glass substrate 12 shown in FIG. 5, and extends on the glass substrate 12 in parallel to each other in the row direction (lateral direction in the drawing) of each pixel 11 as shown in FIG.
- a plurality of source bus lines 14 are provided so as to extend in parallel to each other in a direction intersecting with each gate bus line 13, and between the gate bus lines 13.
- Auxiliary capacitor bus line 15 is provided below each pixel 11 in the column direction (vertical direction in the figure).
- Each gate bus line 13 and each source bus line 14 define each pixel 11, and the gate bus lines 13 that form the intersections in the vicinity of the intersections between the gate bus lines 13 and the source bus lines 14.
- a thin film transistor 16 connected to the source bus line 14 is provided.
- each thin film transistor 16 includes a gate electrode 16g provided on the glass substrate 12 and configured by a part of the gate bus line 13, and a substantially entire surface of the glass substrate 12 so as to cover the gate electrode 16g.
- a semiconductor layer 16h provided so as to overlap the gate electrode 16g via a gate insulating film 17 provided on the source layer, and a source electrode 16s connected to one end side of the semiconductor layer 16h and connected to the source bus line 14.
- a drain electrode 16d connected to the other end of the semiconductor layer 16h.
- the auxiliary layer 18 overlaps the terminal layer 18 on the upper side in the column direction of each pixel 11 and the auxiliary capacitance bus line 15 on the lower side in the column direction of each pixel 11.
- a capacitor electrode 19 is provided integrally with the drain electrode 16 d of the thin film transistor 16 in each pixel 11.
- the thin film transistor substrate 10 is provided with an insulating film 20 so as to cover each source bus line 14, each thin film transistor 16, each terminal layer 18, and each auxiliary capacitance electrode 19.
- a pixel electrode 21 is provided for each pixel 11 on the top.
- contact holes 20 h are respectively formed on the terminal layers 18 and the auxiliary capacitance electrodes 19.
- the insulating film 20 is formed such that the surface of the reflection region 11 r of each pixel 11 has an uneven shape, and the uneven shape is, for example, a ridge shape in which concave portions and convex portions extend randomly. Has been.
- each pixel electrode 21 is provided in the reflective region 11r, which is a reflective layer made of a metal material having a high reflectance such as Al or Ag, and in the transmissive region 11t.
- the transparent electrode 21t is made of a metal material having high transmittance such as ITO (Indium Tin Oxide).
- ITO Indium Tin Oxide
- the reflective electrode 21r and the transparent electrode 21t are provided separately from each other.
- the reflective electrode 21r is connected to the terminal layer 18 via the contact hole 20h, and the transparent electrode 21t is connected to the auxiliary capacitance electrode 19 via the contact hole 20h. Are connected to each.
- each reflective electrode 21r reflects the uneven shape of the insulating film 20, and as shown in FIG. 4, the concave portions 22 and the convex portions 23 are formed in a bowl-shaped uneven shape extending randomly, and is incident from the periphery. Light is scattered and reflected to the front side of the liquid crystal display device S.
- the uneven shape of each reflective electrode 21r is such that the reflectance in the normal direction of the display surface 2s of the light reflected by each reflective electrode 21r is the center of the curved direction at both ends in the curved direction on the display surface 2s. It is comprised so that it may become higher.
- the display region 2 extends in the normal direction of the display surface 2 s in each reflective electrode 21 r from the central portion in the bending direction (vertical direction in the drawing) on the display surface 2 s toward both ends in the bending direction.
- a plurality of belt-like regions (first to third regions A to C) having different light reflectivities are arranged in parallel.
- the display area 2 is provided in the center of the display surface 2s in the bending direction, and the reflectance of light in the normal direction of the display surface 2s in each reflective electrode 21r is greater than 0% and less than 5%.
- a second region B provided on both sides of the first region A and having a reflectance of light in the normal direction of the display surface 2s of each reflective electrode 21r of 5% or more and less than 10%.
- a third region provided on the opposite side of each second region B from the first region A and having a reflectance of light in the normal direction of the display surface 2s of each reflective electrode 21r of 10% or more and less than 15%. C is included.
- the reflectance of light in the normal direction of the display surface 2s of each reflective electrode 21r in the plurality of strip-shaped regions A to C arranged in parallel is the uneven shape of each reflective electrode 21r for each of the strip-shaped regions A to C.
- the distribution range of the inclination angle ⁇ and the degree of the average inclination angle are adjusted according to the surface state of the insulating film 20, so that the display surface 2 s increases stepwise from the center in the bending direction toward both ends.
- each reflective electrode 21r in the first to third regions A to C of the present embodiment is such that the average inclination angle increases from the center in the bending direction on the display surface 2s toward both ends in the bending direction.
- the distribution range of the inclination angle ⁇ is adjusted.
- the inclination angle ⁇ of the concavo-convex shape of the reflective electrode 21r is the inclination angle between the bottom of the adjacent concave portion 22 and the top of the convex portion 23, that is, the adjacent concave portion 22 as shown in FIGS.
- the angle which the straight line which connects the bottom part of this and the top part of the convex part 23, and the surface parallel to the glass substrate 12 surface makes on the convex part 23 side is meant.
- the average inclination angle means an arithmetic average value of the inclination angles ⁇ between the bottoms of all adjacent concave portions 22 and the top portions of the convex portions 23 in the reflective electrode 21r.
- the concavo-convex shape of each reflective electrode 21r in the first region A is a relatively gentle concavo-convex shape as shown in FIG. 5, for example, the inclination angle ⁇ is 1.0 to 4.0 °. It is distributed in the range, and the average inclination angle is about 2.5 °. As shown in FIG. 6, the uneven shape of each reflective electrode 21r in each second region B is steeper than the uneven shape of each reflective electrode 21r in the first region A. For example, the inclination angle ⁇ is 4 The distribution is in the range of 0.0 to 7.0 °, and the average inclination angle is about 5.5 °. As shown in FIG.
- the uneven shape of each reflective electrode 21r in each third region C is a steeper uneven shape than the uneven shape of each reflective electrode 21r in each second region B.
- the inclination angle ⁇ Are distributed in the range of 7.0 to 10.0 °, and the average inclination angle is configured to be about 8.5 °.
- the thin film transistor substrate 10 is formed in a large area longer than the color filter substrate 30 in the long side direction of the liquid crystal display panel 1, and protrudes outward from the color filter substrate 30.
- the mounting unit 10a includes an integrated circuit chip 25 for driving a thin film transistor and the like, a flexible printed wiring board 26 for supplying power to the integrated circuit chip 25 and a signal from an external circuit to the liquid crystal display panel 1 and the like. Has been implemented.
- the color filter substrate 30 includes a glass substrate 31, and a plurality of color filters 32 are provided on the glass substrate 31 so as to overlap the pixel electrodes 21.
- a black matrix 33 is provided so as to partition.
- the thickness of the liquid crystal layer 40 on each reflective region 11r is made smaller than the thickness of the liquid crystal layer 40 on each transmissive region 11t so as to overlap the reflective region 11r of each pixel 11.
- a transparent layer 34 is provided. As a result, the thickness of the liquid crystal layer 40 on each reflective region 11r is reduced to about half the thickness of the liquid crystal layer 40 on each transmissive region 11t, and the liquid crystal layer 40 on each reflective region 11r and each transmissive region 11t.
- the optical path length of the light passing through is made substantially equal to improve the display quality.
- a common electrode 35 is provided on the color filter substrate 30 so as to cover each color filter 32 together with each transparent layer 34.
- the backlight 5 includes a plurality of optical sheets such as a light source such as a fluorescent lamp (cold cathode tube) and an LED (Light Emitting Diode), a light guide plate, and a prism sheet.
- a light source such as a fluorescent lamp (cold cathode tube) and an LED (Light Emitting Diode)
- a light guide plate and a prism sheet.
- Each of the light guide plate and each optical sheet is formed of a resin and has flexibility.
- the backlight 5 is entirely deformed and fixed in a curved shape along the liquid crystal display panel 1, and the light incident on the light guide plate from the light source is converted into the light guide plate.
- the light is emitted as uniform planar light from the emission surface to the liquid crystal display panel 1 side through each optical sheet.
- the transflective liquid crystal display device S is common to each pixel electrode 21 in the state where each pixel 11 reflects external light at the reflection region 11r and transmits light from the backlight 5 at the transmission region 11t.
- a voltage between the electrodes 35 and controlling the orientation of liquid crystal molecules for each pixel 11 a desired image is displayed on the display surface 2s (display region 2).
- the bus lines 13, 14, 15, the thin film transistor 16, the terminal layer 18, and the auxiliary capacitance electrode 19 are formed on one glass substrate 12.
- a positive photosensitive resin film was applied and formed on the glass substrate 12 using a spin coater or the like, and a prebake and a mask were used for about 2 minutes at a temperature of about 110 ° C. with respect to the photosensitive resin film.
- Each contact hole 20h is formed by sequentially performing an exposure process and a development process.
- the photosensitive resin film in which each contact hole 20h is formed is post-baked at a temperature of about 135 ° C. for about 8 minutes, and then each reflection region 11r of each strip-like region A to C in the photosensitive resin film. Irradiation of ultraviolet rays with irradiation energy matched to the concavo-convex shape of the insulating film 20 formed in each of the regions is sequentially performed using a mask.
- the region to be the first region A has a relatively low irradiation energy
- the region to be the second region B has an irradiation energy higher than the irradiation energy of the region to be the first region A
- the region to be the third region C is irradiated with ultraviolet rays with an irradiation energy higher than the irradiation energy of the region to be the second region B.
- the photosensitive resin film is subjected to final baking at a temperature of about 210 ° C. for about 60 minutes, so that the distribution range of the inclination angle ⁇ in the areas to be the strip-like areas A to C on the surface of the photosensitive resin film.
- corrugated shape from which the grade of an average inclination angle differs is formed. In this way, the insulating film 20 having a predetermined uneven surface is formed in the regions to be the strip regions A to C.
- a reflective electrode 21r is formed in each of the regions to be the reflective regions 11r of the insulating film 20. At this time, the surface of each reflective electrode 21r is formed in an uneven shape reflecting the uneven shape of the insulating film 20. Further, the thin film transistor substrate 10 is manufactured by forming the transparent electrodes 21t in the regions to be the transmission regions 11t of the insulating film 20, respectively. Then, an alignment film 41 is formed on the thin film transistor substrate 10 by a printing method or the like.
- the color filter substrate 30 is manufactured by forming the black matrix 33, the color filter 32, the transparent layer 34, and the common electrode 35 on the other glass substrate 31. Then, an alignment film 42 is formed on the surface of the color filter substrate 30 by a printing method. Next, the sealing material 45 is formed in a frame shape on the thin film transistor substrate 10 by drawing or printing using a dispenser or the like. Next, a predetermined amount of liquid crystal material is dropped onto a region surrounded by the sealing material 45 on the thin film transistor substrate 10. Subsequently, in the evacuated processing chamber, the thin film transistor substrate 10 and the color filter substrate 30 are aligned and arranged so that each pixel electrode 21 and each color filter 32 overlap each other, and both the substrates 10 and 30 are sealed. 45 and pasting together. Thereafter, the sealing material 45 is cured to bond the substrates 10 and 30 to each other. Thus, the liquid crystal display panel 1 is manufactured.
- a sealing material 45 is supplied in a frame shape to the thin film transistor substrate 10, and a liquid crystal material is dropped inside the sealing material 45, and then the thin film transistor substrate 10 and the color filter substrate 30 are bonded together.
- the manufacturing of the liquid crystal display panel 1 is described by taking the method as an example. However, a sealing material is applied and formed in a substantially frame shape having a cut to the thin film transistor substrate 10, and the thin film transistor substrate 10 and the color are formed through the sealing material.
- a liquid crystal display panel may be manufactured by a so-called vacuum injection method in which the filter substrates 30 are bonded to each other, and then a liquid crystal material is vacuum-injected from an injection port constituted by a cut in the sealing material, and then the injection port is sealed. .
- polarizing plates 43 and 44 are respectively attached to both sides of the liquid crystal display panel 1, and the integrated circuit chip 25 and the flexible printed wiring board 26 are mounted on the mounting portion 10a of the thin film transistor substrate 10, respectively.
- a backlight 5 prepared in advance is attached to the back side of the liquid crystal display panel 1, and the liquid crystal display panel 1 and the backlight 5 are deformed and fixed so that the display surface 2s is curved in a concave shape.
- the liquid crystal display device S shown is completed.
- the uneven shape of each reflective electrode 21r is such that the reflectance of the light reflected by each reflective electrode 21r in the normal direction of the display surface 2s is at both ends of the display surface 2s in the bending direction. It is comprised so that it may become higher than the center part of the curve direction.
- the reflectance of the light reflected by each reflective electrode 21r to the front side of the liquid crystal display device S can be increased at both ends in the bending direction on the display surface 2s relative to the center in the bending direction.
- variations in luminance can be suppressed and display quality can be improved.
- the display area 2 includes the first to third areas A to C, the normal direction of the display surface 2s in each reflective electrode 21r from the central portion of the display surface 2s toward the both ends thereof is obtained. Therefore, the variation in luminance can be satisfactorily suppressed in the curved liquid crystal display device S.
- FIG. 8 is a plan view schematically showing a part of the thin film transistor substrate 10 of the present embodiment.
- 9 to 11 are cross-sectional views of portions corresponding to positions along the YY line of FIG. 8 in each of the areas A, B, and C of the display area 2.
- the transflective liquid crystal display device S has been described.
- the reflective liquid crystal display device S will be described.
- each pixel electrode 21 is constituted by a reflective electrode 21r.
- Each reflective electrode 21r is connected to an auxiliary capacitance electrode 19 formed integrally with the drain electrode 16d of the thin film transistor 16 in each pixel 11 through a contact hole 20h.
- the liquid crystal display panel 1 of the present embodiment is curved so that the display surface 2s becomes a concave curved surface, and the display region 2 extends in the normal direction of the display surface 2s in each reflective electrode 21r. A plurality of band-like regions A to C having different light reflectivities are included. Then, as shown in FIG.
- each reflective electrode 21r is formed in a bowl-shaped concavo-convex shape in which the concave portions 22 and the convex portions 23 extend at random, and the concavo-convex shape of each of the reflective electrodes 21r has an inclination angle ⁇ .
- the reflectance of light in the normal direction of the display surface 2s at each reflective electrode 21r is the center of the curved direction on the display surface 2s. It gradually increases from the part toward both ends.
- each reflective electrode 21r is also from the center of the display surface 2s in the bending direction toward both ends in the bending direction, as in the first embodiment.
- the distribution range of the inclination angle ⁇ is adjusted to increase the average inclination angle.
- the concavo-convex shape of each reflective electrode 21r in the first region A is a relatively gentle concavo-convex shape as shown in FIG. 9, for example, the inclination angle ⁇ is distributed in the range of 1.0 to 4.0 °, The average inclination angle is about 2.5 °.
- each reflective electrode 21r in each second region B is steeper than the concavo-convex shape of each reflective electrode 21r in the first region A, as shown in FIG.
- the distribution is in the range of 0.0 to 7.0 °, and the average inclination angle is about 5.5 °.
- the uneven shape of each reflective electrode 21r in each third region C is a steeper uneven shape than the uneven shape of each reflective electrode 21r in each second region B.
- the inclination angle ⁇ Are distributed in the range of 7.0 to 10.0 °, and the average inclination angle is configured to be about 8.5 °.
- liquid crystal display device S of the present embodiment are the same as those of the first embodiment, and a front light is attached to the front side (upper side in FIG. 1) of the liquid crystal display panel 1 as necessary.
- the display area 2 includes the first to third areas A to C, the display on each reflective electrode 21r from the center in the bending direction toward the both ends on the display surface 2s. Since the reflectance of light in the normal direction of the surface 2s increases stepwise, the same effect as in the first embodiment can be obtained.
- FIG. 12 shows Embodiment 3 of the present invention.
- FIG. 12 is a perspective view schematically showing the liquid crystal display device S of the present embodiment.
- the liquid crystal display panel 1 is curved so that the display surface 2s is a concave curved surface.
- the liquid crystal display panel 1 is as shown in FIG.
- the display surface 2s is curved in the long side direction so as to be a convex curved surface.
- the arrows in FIG. 12 indicate the bending direction of the liquid crystal display panel 1 (display surface 2s).
- the backlight 5 is also curved along the liquid crystal display panel 1.
- the liquid crystal display panel 1 is curved in the long side direction.
- the liquid crystal display panel 1 may be curved in the short side direction, and the rectangular display surface 2s is inclined. You may be comprised so that it may curve.
- the surface of each reflective electrode 21r is formed in a bowl-shaped uneven shape, and the distribution range of the inclination angle ⁇ in the uneven shape of each reflective electrode 21r.
- the degree of the average inclination angle is adjusted for each of the belt-like regions (first to third regions) A to C, so that the reflectance of light in the normal direction of the display surface 2s in each reflective electrode 21r is changed to the display surface. In 2s, the height increases stepwise from the center in the bending direction toward both ends.
- the display area 2 includes the first to third areas A to C, the display on each reflective electrode 21r from the central portion to the both ends in the bending direction on the display surface 2s. Since the reflectance of light in the normal direction of the surface 2s increases stepwise, the same effect as in the first embodiment can be obtained.
- FIG. 13 shows Embodiment 4 of the present invention.
- FIG. 13 is a plan view schematically showing a part of the thin film transistor substrate 10 of the present embodiment.
- each reflective electrode 21r is formed in a bowl-shaped concavo-convex shape in which the concave portions 22 and the convex portions 23 extend randomly, but in this embodiment, the bowl-like shape of each reflective electrode 21r.
- the concave-convex shape of the concave portion 22 and the convex portion 23 extend in parallel to each other in the row direction (lateral direction in the figure) inside the frame-shaped convex portion 23 and each pixel 11.
- each reflective electrode 21r of the present embodiment has fewer inclined surfaces facing the row direction side of each pixel 11, and the light reflectance of each reflective electrode 21r is on both sides of the display surface 2s.
- it is configured to be lower than the front side of the display surface 2s.
- Other configurations of the liquid crystal display device S of the present embodiment are the same as those of the second embodiment.
- the source bus line 14 and the drain electrode 16d are formed, and at the same time, the region which becomes each pixel 11 extends in the row direction and stripes in the column direction.
- a plurality of patterns arranged in a line are formed.
- the concave portions 22 and the convex portions 23 are formed to extend along each pattern, and the ladder is formed on the insulating film 20.
- a concavo-convex shape is formed.
- the surface of the reflective electrode 21r is configured in a ladder-like uneven shape reflecting the uneven shape of the insulating film 20.
- the fourth embodiment similarly to the second embodiment, in the curved liquid crystal display device S, it is possible to satisfactorily suppress the luminance variation and improve the display quality. Since the light reflectance of each of the reflective electrodes 21r can be made lower on both sides of the display surface 2s than on the front side of the display surface 2s due to the uneven shape of 21r, the image display is visible from both sides of the display surface 2s Can be difficult. In this way, the visibility is intentionally lowered on both sides of the display surface 2s so that only the user on the front side can see, so that the display cannot be seen by others.
- the concave and convex shape of the insulating film 20 is formed in a bowl shape in which the concave portion and the convex portion extend at random.
- the present invention is not limited to this, and the concave and convex shape of the insulating film 20 is An uneven shape in which a plurality of dot-like convex portions are randomly provided may be used, and various uneven shapes can be adopted.
- each reflective electrode 21r has a light reflectance that is lower on both sides of the display surface 2s than on the front side of the display surface 2s.
- 21r is configured, but the present invention is not limited to this, and in the transflective liquid crystal display device S, the surface of each reflective electrode 21r is formed in a ladder-like uneven shape as in the fourth embodiment. Thereby, the reflectance of light in each reflective electrode 21r may be lower on both sides of the display surface 2s than on the front side of the display surface 2s.
- the light reflectance of each reflective electrode 21r is reduced on both sides of the display surface 2s due to the uneven shape of each reflective electrode 21r. Since it can be made lower than the front side of the display surface 2s, it is difficult to visually recognize the image display from both sides of the display surface 2s, and it is possible to prevent others from seeing the display.
- the present invention is useful for a liquid crystal display device, and is particularly suitable for a curved liquid crystal display device in which it is desired to improve display quality by suppressing variations in luminance.
- region S Liquid crystal display device 2 Display area
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Abstract
Description
図1~図7は、本発明の実施形態1を示している。図1は、本実施形態の液晶表示装置Sを概略的に示す斜視図である。図2は、図1のII-II線に沿って液晶表示装置Sを概略的に示す断面図である。図3は、液晶表示パネル1の表示領域2を概略的に示す平面図である。図4は、薄膜トランジスタ基板10の一部を概略的に示す平面図である。図5~図7は、表示領域2の各領域A,B,Cにおいて、図4のX-X線に沿った位置に対応する部分の断面図である。尚、図1では偏光板43,44の図示を省略している。
次に、上記液晶表示装置Sの製造方法について説明する。
したがって、この実施形態1によると、各反射電極21rの凹凸形状は、それら各反射電極21rによって反射した光の表示面2sの法線方向への反射率が表示面2sにおいて湾曲方向の両端部でその湾曲方向の中央部よりも高くなるように構成されている。そのことにより、各反射電極21rによって反射した光の液晶表示装置Sの正面側への反射率を表示面2sにおいて湾曲方向の両端部でその湾曲方向の中央部に対して高めることができるため、湾曲状の液晶表示装置Sにおいて、輝度のばらつきを抑制でき、表示品位を向上させることができる。
図8~図11は、本発明の実施形態2を示している。尚、以降の各実施形態では、図1~図7と同じ部分については同じ符号を付して、その詳細な説明を省略する。図8は、本実施形態の薄膜トランジスタ基板10の一部を概略的に示す平面図である。図9~図11は、表示領域2の各領域A,B,Cにおいて、図8のY-Y線に沿った位置に対応する部分の断面図である。
したがって、この実施形態2によっても、表示領域2が第1~第3領域A~Cを含んでいることにより、表示面2sにおいて湾曲方向の中央部から両端部に向かって各反射電極21rにおける表示面2sの法線方向への光の反射率が段階的に高くなるため、上記実施形態1と同様の効果を得ることができる。
図12は、本発明の実施形態3を示している。図12は、本実施形態の液晶表示装置Sを概略的に示す斜視図である。
したがって、この実施形態3によっても、表示領域2が第1~第3領域A~Cを含んでいることにより、表示面2sにおいて湾曲方向の中央部から両端部に向かって各反射電極21rにおける表示面2sの法線方向への光の反射率が段階的に高くなるため、上記実施形態1と同様の効果を得ることができる。
図13は、本発明の実施形態4を示している。図13は、本実施形態の薄膜トランジスタ基板10の一部を概略的に示す平面図である。
したがって、この実施形態4によると、上記実施形態2と同様に、湾曲状の液晶表示装置Sにおいて、輝度のばらつきを良好に抑制でき、表示品位を向上させることができることに加えて、各反射電極21rの凹凸形状によってそれら各反射電極21rの光の反射率が表示面2sの両側方側でその表示面2sの正面側よりも低くできるため、表示面2sの両側方側からは画像表示を視認し難くできる。このように正面側の使用者のみにしか視認できないように表示面2sの両側方側では視認性を故意に低下させることで、他者に表示を覗かれないようにすることができる。
上記実施形態1では、絶縁膜20の表面に凹凸形状を形成する方法として、絶縁膜20を構成する感光性樹脂膜に紫外線を照射した後にファイナルベークを行う方法を説明したが、本発明はこれに限られず、絶縁膜を構成する感光性樹脂膜に紫外線を照射した後に、その感光性樹脂膜を現像して絶縁膜の表面に凹凸形状を形成してもよく、絶縁膜の下層にその絶縁膜の表面を凹凸形状に構成するためのパターンを形成する等、その他の公知の方法によって絶縁膜20の表面に凹凸形状を形成してもよい。
B 第2領域
C 第3領域
S 液晶表示装置
2 表示領域
2s 表示面
10 薄膜トランジスタ基板(第1基板)
11 画素
11r 反射領域
11t 透過領域
21r 反射電極(反射層)
30 カラーフィルタ基板(第2基板)
Claims (5)
- 複数の画素が規定され、該各画素毎に反射層が設けられた第1基板と、
上記第1基板に対向して配置された第2基板と、
上記各画素によって画像表示を行う表示面とを備え、
上記表示面が一方向に湾曲した液晶表示装置であって、
上記各反射層は、該各反射層によって反射した光の上記表示面の法線方向への反射率が上記表示面において湾曲方向の両端部で該湾曲方向の中央部よりも高くなるように構成されている
ことを特徴とする液晶表示装置。 - 請求項1に記載の液晶表示装置において、
上記各反射層は、表面が凹凸状に形成され、
上記各反射層の凹凸形状は、該各反射層の上記反射率が上記表示面において湾曲方向の両端部で該湾曲方向の中央部よりも高くなるように構成されている
ことを特徴とする液晶表示装置。 - 請求項1又は2に記載の液晶表示装置において、
上記複数の画素が構成する表示領域は、上記表示面の湾曲方向の中央部に設けられて上記各反射層の反射率が第1の反射率である第1領域と、該第1領域の両側にそれぞれ設けられて上記各反射層の反射率が上記第1の反射率よりも高い第2の反射率である第2領域と、該各第2領域の上記第1領域とは反対側にそれぞれ設けられて上記各反射層の反射率が上記第2の反射率よりも高い第3の反射率である第3領域とを含む
ことを特徴とする液晶表示装置。 - 請求項1~3のいずれか1つに記載の液晶表示装置において、
上記各画素は、上記反射層が設けられた反射領域と、上記反射層が設けられていない透過領域とを有する
ことを特徴とする液晶表示装置。 - 請求項2に記載の液晶表示装置において、
上記各反射層の凹凸形状は、該各反射層の反射率が上記表示面の周辺側で該表示面の正面側よりも低くなるように構成されている
ことを特徴とする液晶表示装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP09834245.4A EP2372437B1 (en) | 2008-12-26 | 2009-08-05 | Liquid crystal display device |
BRPI0923628A BRPI0923628A2 (pt) | 2008-12-26 | 2009-08-05 | dispositivo de vídeo de cristal líquido. |
US13/141,088 US8477271B2 (en) | 2008-12-26 | 2009-08-05 | Liquid crystal display device |
JP2010543756A JP5095828B2 (ja) | 2008-12-26 | 2009-08-05 | 液晶表示装置 |
CN2009801464848A CN102224447B (zh) | 2008-12-26 | 2009-08-05 | 液晶显示装置 |
RU2011131059/28A RU2471216C1 (ru) | 2008-12-26 | 2009-08-05 | Устройство жидкокристаллического дисплея |
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PCT/JP2009/003743 WO2010073427A1 (ja) | 2008-12-26 | 2009-08-05 | 液晶表示装置 |
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US (1) | US8477271B2 (ja) |
EP (1) | EP2372437B1 (ja) |
JP (1) | JP5095828B2 (ja) |
CN (1) | CN102224447B (ja) |
BR (1) | BRPI0923628A2 (ja) |
RU (1) | RU2471216C1 (ja) |
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- 2009-08-05 EP EP09834245.4A patent/EP2372437B1/en active Active
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Also Published As
Publication number | Publication date |
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US8477271B2 (en) | 2013-07-02 |
EP2372437A1 (en) | 2011-10-05 |
CN102224447B (zh) | 2013-10-16 |
BRPI0923628A2 (pt) | 2016-01-19 |
US20110255039A1 (en) | 2011-10-20 |
EP2372437B1 (en) | 2018-10-10 |
JP5095828B2 (ja) | 2012-12-12 |
JPWO2010073427A1 (ja) | 2012-05-31 |
CN102224447A (zh) | 2011-10-19 |
RU2471216C1 (ru) | 2012-12-27 |
EP2372437A4 (en) | 2012-09-26 |
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