WO2006075564A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2006075564A1 WO2006075564A1 PCT/JP2006/300119 JP2006300119W WO2006075564A1 WO 2006075564 A1 WO2006075564 A1 WO 2006075564A1 JP 2006300119 W JP2006300119 W JP 2006300119W WO 2006075564 A1 WO2006075564 A1 WO 2006075564A1
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- liquid crystal
- light
- crystal display
- display device
- pixel
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
-
- 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
-
- 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
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/52—RGB geometrical arrangements
Definitions
- the present invention relates to a transflective liquid crystal display device capable of both reflective display and transmissive display.
- Liquid crystal display devices are widely used in liquid crystal televisions, monitors, mobile phones, and the like as flat panel displays having features such as thinness and light weight.
- Various methods have been proposed for realizing colorization of liquid crystal display devices, but the practical methods are the color filter method and the field sequential method.
- the color filter method spatially combines a liquid crystal element having an optical shutter function and a color filter in which the colored areas of the RGB three primary colors are reduced to a level that cannot be recognized by the human eye. This is a method for displaying full color by mixing RGB color information.
- the field sequential method has a configuration in which a backlight capable of sequentially emitting light in three colors of RGB and a liquid crystal element that displays color information according to the emission color of the knocklight are stacked.
- This is a system that performs full-color display by temporally mixing RGB color information by shortening the period of sequential light emission to the RGB of the light, about 16 msec, to a level that cannot be recognized by the human eye.
- Patent Document 1 discloses a liquid crystal display device that is capable of power-colored display by reflecting ambient light that is a field sequential method.
- Patent Document 2 discloses a liquid crystal display device including a reflective region composed of colored pixels and a transmissive region without colored portions.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-61747
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2004-177726
- the color filter type liquid crystal display device generally has a very low light utilization efficiency of 10% or less.
- the main reason for the significant decrease in usage efficiency is the low light transmittance of the color filter. For example, when an absorptive color filter is used, only about 30% of light can be used depending on the density of the color filter.
- the field sequential method is a method that performs color display using the emission color of the knocklight, and does not require a color filter. Therefore, the light use efficiency is more than three times higher than that of the color filter method. It is possible to realize a liquid crystal display device that can display high brightness with very little power consumption. However, the liquid crystal display device using the field sequential method can only perform transmissive display using the light of the knock light in order to perform color display using the emission color of the knock light.
- a liquid crystal display device of a mopile device typified by a mobile phone
- display is performed using light from a backlight.
- the surrounding light is reflected on the surface of the display device, so that the contrast is lowered and the visibility is not significantly deteriorated.
- display is performed by reflecting ambient light with a reflecting plate disposed in a pixel of a liquid crystal cell.
- a liquid crystal display device is generally called a transflective liquid crystal display device.
- the mopile device operates with a limited battery, it is an important issue to reduce the power consumption of the liquid crystal display device, and the light use efficiency is high and the reflective display by ambient light is possible. A display device is desired!
- Patent Document 1 a liquid crystal display device capable of both transmissive display and reflective display as described in Patent Document 1 is considered.
- Patent Document 1 since the reflection mode and the transmission mode cannot be displayed simultaneously, it is necessary to select one of the modes by switching the driving method of the liquid crystal element depending on the brightness of the surrounding environment. there were.
- the display mode can be switched using the LCD
- Patent Document 2 has a problem that the use efficiency of the backlight is poor and the power consumption increases.
- An object of the present invention is to provide a liquid crystal display device that has high visibility, low power consumption, and low cost regardless of the brightness of the surrounding environment.
- the liquid crystal display device of the present invention includes: 1 picture element includes a pixel that becomes a light reflection region and a pixel that becomes a light transmission region, and is arranged in the pixel that becomes a light transmission region.
- the liquid crystal element is characterized in that it is driven to display color information corresponding to the emission color of the backlight.
- transmissive display by the field sequential method and reflective display by ambient light can be displayed simultaneously.
- liquid crystal display device it is desirable to provide a colored layer that transmits light of a specific wavelength in the light reflection region.
- this condensing element can be a lenticular lens or a microlens array provided on the substrate on the backlight side.
- the light emitted from the knocklight is collected in the transmission region, and the light utilization efficiency is increased.
- the pixels serving as the light reflecting region are three types of pixels including R, G, and B color filters, and the pixels serving as the light transmitting region include an image including a transparent layer. By using it as a prime, full color display becomes possible.
- the transmissive display and the reflective display are displayed at the same time, it is not necessary to switch between the transmissive mode and the reflective mode as in the conventional example. It is possible to provide a low-cost liquid crystal display device that can display high brightness with power consumption.
- FIG. 1 is a schematic perspective view of a transflective liquid crystal display device of the present invention.
- FIG. 2 is a schematic cross-sectional view of a display panel and a backlight according to the present invention.
- FIG. 3 is a schematic plan view of a transparent substrate of the present invention.
- FIG. 4 is a schematic plan view of a transparent substrate according to another embodiment of the present invention.
- FIG.5 This is a display example when the transparent layer and G color filter are arranged side by side.
- FIG. 6 A display example when the transparent layer and G color filter are arranged diagonally.
- FIG. 7 is a schematic cross-sectional view of a display panel and a backlight according to another embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view of a display panel and a backlight according to another embodiment of the present invention.
- FIG. 9 is a schematic plan view showing microlenses according to another embodiment of the present invention using contour lines.
- FIG. 10 is a schematic plan view showing microlenses according to another embodiment of the present invention using contour lines.
- FIG. 11 is a drawing showing the amount of light transmitted through the display panel with respect to the area ratio of the lens formation region.
- FIG. 12 is a schematic plan view of a transparent substrate according to another embodiment of the present invention.
- FIG. 13 is a schematic plan view of a transparent substrate according to another embodiment of the present invention.
- FIG. 14 is a schematic plan view of a transparent substrate according to another embodiment of the present invention.
- FIG. 15 is a schematic plan view of a transparent substrate according to another embodiment of the present invention.
- FIG. 16 is a schematic cross-sectional view of a backlight according to the present invention.
- FIG. 17 is an enlarged view of the prism of the present invention.
- FIG. 18 is a diagram showing a time transition of display intensity of each pixel of the present invention.
- FIG. 19 Schematic diagram of a transparent substrate of a field sequential liquid crystal display device of a comparative example It is a top view.
- FIG. 20 is a cross-sectional view taken along the line XX in FIG.
- FIG. 21 is a schematic perspective view of a backlight of a comparative example.
- FIG. 22 is a diagram for explaining the reflective display in FIG.
- FIG. 23 is a diagram for explaining the reflective display in FIG. Explanation of symbols
- FIG. 1 is a schematic perspective view of a transflective liquid crystal display device of the present invention.
- the transflective liquid crystal display device includes a backlight 50 and a display panel 100 provided on the front surface (emission surface) side of the backlight 50.
- FIG. 2 is a schematic cross-sectional view of the display panel 100 and the backlight 50.
- a liquid crystal layer 6 having a liquid crystal element is sandwiched between the pair of transparent substrates 1 and 2.
- a color filter layer 7 including a red (R) color filter, a green (G) color filter, a blue (B) color filter, and a transparent layer (W) is provided on the surface of the transparent substrate 1 on the liquid crystal layer 6 side.
- the R, G, and B color filters are colored layers that transmit only light of a corresponding color (specific wavelength).
- the transparent layer W is a transparent layer that hardly absorbs light.
- the R, G, and B color filters and the transparent layer W are arranged in a matrix as shown in FIG.
- a black matrix 7 a for shielding a gap between patterns is formed at a portion of the color filter layer 7 that partitions the R, G, and B color filters and the transparent layer W.
- a transparent overcoat layer made of acrylic resin or epoxy resin (not shown) is formed on the surface of the color filter layer 7 on the liquid crystal layer 6 side, and a transparent electrode 3 made of an ITO thin film is formed thereon. It is formed.
- FIG. 3 shows a schematic plan view of the transparent substrate 2.
- the source node line 15 and the gate bus line 16 form a matrix, and the TFT 10 is formed at the intersection.
- the TFT10 is schematically indicated by a symbol.
- a step is formed in a region corresponding to the R, G, B color filter by the transparent resin 17, and further, a high light reflectivity is formed thereon. !, A1 thin film is formed as the reflective electrode 5. Since the surface of the transparent resin 17 has minute irregularities, the light incident on the reflective electrode 5 is scattered and reflected. In addition, in the region corresponding to the transparent layer W of the transparent substrate 2 on which the TFT array is formed, a transparent electrode 4 made of an ITO thin film is formed without using a transparent resin. The transparent electrode 4 and the reflective electrode 5 function as pixel electrodes for driving the corresponding liquid crystal layer 6.
- the source electrode of the TFT 10 is connected to the source bus line 15, and the gate electrode is connected to the gate bus line.
- the drain electrode is connected to the pixel electrode (transparent electrode 4 and reflective electrode 5).
- the transparent substrates 1 and 2 thus obtained are coated with an alignment film (not shown) and subjected to an appropriate liquid crystal alignment treatment by a rubbing method. Thereafter, the transparent substrates 1 and 2 are laminated so that the electrodes face each other so as to sandwich the liquid crystal layer 6.
- R, G, B, and W regions surrounded by the source bus line 15 and the gate bus line 16 are defined as pixels (pixel R, pixel G, pixel B, and pixel W), respectively.
- Pixel R, pixel G, pixel B, and pixel W are collectively called one picture element.
- the pixel R, the pixel G, and the pixel B may be referred to as a light reflection region
- the pixel W may be referred to as a light transmission region.
- an OCB mode capable of high-speed driving is used.
- polarizing plates 9 are bonded to the surfaces of the transparent substrates 1 and 2 that are not on the liquid crystal layer 6 side.
- a lenticular lens is provided as a condensing element 8 on the surface of the transparent substrate 2 that is not on the liquid crystal layer 6 side.
- the lenticular lens is a lens in which a bowl-shaped lens is formed in an array. The vertex of the lenticular lens is formed to coincide with the center of the light transmission region.
- the lenticular lens can be formed by a known method. Specifically, for example, it is formed by the steps described below.
- a mold master in which a desired lenticular lens shape is precisely formed is prepared.
- An ultraviolet curable resin is sealed between the mold master and the transparent substrate 2 of the liquid crystal display panel 100.
- the encapsulated fat is irradiated with ultraviolet rays and cured.
- the UV-cured resin is completely cured, gently release the mold.
- an ultraviolet curable resin that is highly cured and has high transparency and small birefringence is preferably used.
- an ion exchange method, a photolithography method, a heat dripping method, or the like can be used.
- the force is not limited to the case where a lenticular lens is used as the condensing element 8, but a microlens array in which, for example, a bowl-shaped lens is formed in an array may be used.
- FIG. 4 is a schematic plan view.
- the microlens is a bowl-shaped lens with a curvature in the top, bottom, left, and right, so that light is effective.
- the microlens array is arranged in a grid shape, and the apex of the microlens array is formed so as to coincide with the center of the light transmission region.
- the R, G, B color filters and the transparent layer W are arranged in a square shape, and a microlens array is formed so as to coincide with the center of the pixel W which is a light transmission region.
- the arrangement order of the R, G, B color filters and the transparent layer W is not particularly limited, but the transparent layer W having high luminance and the G color filter having high visibility are adjacent to each other vertically or adjacently. It is preferable to arrange them side by side. This is because text displays and images with many straight lines look clearer.
- a white straight line (white straight line) is displayed on a black background
- the transparent layer W and the G color filter are arranged side by side as shown in FIG. 5
- the line width generated by the pixels to be lit is the same in 1) and 2).
- the line width is almost equal with the forces 1) and 2) that make the line width narrower than the line width caused by the pixel to be lit due to the difference in the visibility of the color. appear.
- the transparent layer W and the G color filter are arranged side by side as shown in FIG. 6
- the line width generated by the pixels to be lit is the same in 3) and 4).
- the line width is narrower than the line width caused by the pixels to be lit due to the difference in the visibility of the colors.
- Fig. 5 what is different from Fig. 5 is that the phenomenon that the line width perceived by human eyes becomes narrower differs between 3) and 4). In other words, the line widths of 3) and 4) look different.
- An asymmetric display is not preferable because it gives a strange feeling to the human eye.
- FIG. 7 is a cross-sectional view taken along the line Y1-Y1 in FIG. 4
- FIG. 8 is a cross-sectional view taken along the line Y2-Y2 in FIG.
- the main panel structure is the same as that of the above-described embodiment using a lenticular lens, and thus the description thereof is omitted.
- FIG. 9 and FIG. 10 are diagrams showing examples of the shape of the microlens array by contour lines.
- Fig. 9 there is an unformed area between the lenses, and in Fig. 10, all areas are A lens is formed.
- FIG. 11 is a graph showing the area ratio of the lens formation region and the amount of light transmitted through the display panel.
- the amount of light transmitted through the display panel decreases as the lens formation area is smaller, that is, as the lens non-formation area is larger. Therefore, it is preferable in terms of light collection efficiency that the lens is formed in all regions as shown in FIG. 10, rather than the region where no lens is formed as shown in FIG.
- the microlens array can be easily formed by the same method as the lenticular lens.
- the force of arranging the R, G, B color filters and the transparent layer W in a square shape is not limited to this, and may be a free arrangement.
- the transparent layer W since the microlens has an isotropic shape, the transparent layer W must have an isotropic shape as long as the transparent layer W has a shape. Force The condensing spot of the microlens overlaps the transparent layer w.
- the light is preferably transmitted through the transparent layer W efficiently. More specifically, the transparent layer W is preferably isotropically close and shaped like a circle, square, regular hexagon, regular octagon, etc.
- R, G, and B are arranged side by side in the horizontal direction (first direction), and the transparent layer W is either R or B so that the combined shape of the pixels RGBW is a rectangle.
- second direction direction orthogonal to the first direction.
- the brightness of the pixel G is high, so the pixel G appears to jump out of the RB line.
- the pixels are in a delta arrangement. Therefore, it is suitable for display devices specialized for image display, such as digital camera and camcorder monitors, in terms of definition.
- the brightness ratio of the reflection mode and the transmission mode can be controlled.
- the total area power W of the R, G, and B color filters is larger than the area W, the reflectance of ambient light increases, so that a bright reflection mode can be realized.
- the panel transmittance increases even if the area of the transparent layer W is small. Therefore, it is preferable in that the brightness of both the reflection and transmission modes can be increased.
- the area of the transparent layer W is larger than the total area of the R, G, and B color filters as in the structure shown in FIG. 15, for example, a bright transmission mode can be realized. This is especially preferred when the concentrating element 8 is not arranged for low cost.
- FIG. 16 is a schematic cross-sectional view of the backlight 50.
- the backlight 50 includes three light sources (see FIG. 1) of red LED 22, green LED 23, and blue LED 24, a light guide 21 that guides light emitted from the light source, a light reflection layer 25, and a prism sheet 26. Composed.
- the knock light 50 can emit light sequentially to RGB by sequentially emitting light of three colors, for example, three RGB colors are sequentially emitted at a period of about 16 msec (about 5 msec per color).
- the parallelism of the light emitted from the knock light 50 is high.
- the knocklight 50 described below can emit light with high parallelism in a predetermined direction.
- the red LED 22, the green LED 23, and the blue LED 24 are fixed to the light incident surface 21a of the light guide 21 so as not to leak light.
- the directivity of the LED is strong, it is preferable to use the light incident surface 21a as a scattering surface because the luminance uniformity becomes higher.
- On the bottom surface 21b of the light guide 21 is formed a fine force and prism having a surface in a direction perpendicular to the light guide direction.
- FIG. 17 shows an enlarged view of one prism.
- the angle formed by the prism surface 27a facing the light source side and the non-prism surface 27c is about 12 °
- the angle formed by the prism surface 27c facing the prism surface 27b not facing the light source and the surface 27c is 90 °. .
- the light guide 21 having a fine prism surface can be manufactured with high accuracy by a resin molding method using a mold master.
- a resin molding method using a mold master.
- highly transparent resin such as acrylic resin can be used.
- the pitch of the prism becomes shorter as the distance from the light source increases.
- the reflective layer 25 is a PET film formed with a metal thin film such as silver or aluminum, and the prism sheet 26 is a diamond art (trade name) manufactured by Mitsubishi Rayon Co., Ltd. Can be used.
- the surface of the prism sheet 26 on the light guide 21 side has an uneven shape.
- the light emitted to the reflection layer side 25 is reflected by the reflection layer 25 and emitted to the prism sheet 26 side.
- the light emitted from the light guide 21 enters the prism sheet 26 and is reflected in the normal direction of the light guide 21 by the unevenness of the prism sheet 26.
- the backlight 50 thus obtained was able to emit light with a high degree of parallelism, with a half-value angle of about ⁇ 10 °.
- the power of using LEDs that emit light to R, G, and B as the light source is not limited to this. LEDs that can emit light to R, G, and B are used with a single chip. Alternatively, other light sources such as a fluorescent tube may be used. Depending on the size of the light guide 21, there are many light sources.
- Figure 18 shows the time course of the display intensity of each pixel.
- the emission cycle of the RGB3 primary colors of the knocklight 50 is set to 1 frame, and in this embodiment, 1 frame is set to 16.5 msec.
- One frame consists of 3 fields, and R field, G field, and B field according to the emission color of backlight 50. If one frame is 16.5 msec, each field is 5.5 msec.
- a specific voltage is applied to the pixel electrode arranged in each pixel, and the liquid crystal element is driven.
- the color intensity of R is RT
- the color intensity of G is GT
- the color intensity of B is BT
- each pixel intensity of pixels G and B will be the same as the start of all fields.
- a voltage corresponding to RT, GT, and BT is applied to the liquid crystal element, and the ambient light that is always incident is reflected to display.
- a voltage corresponding to the color intensity RT is applied simultaneously with the start of the R field
- a voltage corresponding to the color intensity GT is applied simultaneously with the start of the G field
- a voltage corresponding to the color intensity BT is applied simultaneously with the start of the B field.
- the backlight 50 emits light corresponding to each color and performs display.
- the response time is defined as the time from when the voltage is applied to the liquid crystal element until the driving is completed, and the time during which the backlight 50 emits light is the light emission time
- the response time is approximately 4 msec in the OCB mode. Therefore, the emission time is about 1.5 msec.
- the color information periodically displayed in the pixel W is switched at such a high speed that it cannot be discerned by the human eye, so that the color information is temporally mixed and recognized as a color display.
- the liquid crystal display device manufactured as described above can perform both reflective display that reflects ambient light and transmissive display using the backlight 50 at the same time, and thus has high visibility regardless of the brightness of the surrounding environment.
- the longer the emission time of the knocklight 50 the higher the display luminance. Therefore, it is preferable that the response speed of the liquid crystal element is as fast as possible so that the liquid crystal element can be driven quickly. Also, in order to reduce the effect of color braking, it is preferable that the time of one frame is short.
- the light collecting element 8 is not always necessary. Without the light condensing element 8, the light of the knocklight 50 is not necessarily condensed on the transparent layer W, so that the transmission luminance is reduced, but it is not necessary to produce a fine light condensing element 8, so it is relatively low. A transflective liquid crystal device capable of performing good display at low cost can be obtained.
- FIG. 19 is a schematic plan view of a transparent substrate of a general field sequential type liquid crystal display device
- FIG. 20 is a cross-sectional view taken along the line XX of FIG.
- a transparent electrode 3 made of an ITO thin film is formed on the surface of the transparent substrate 1 on the liquid crystal layer 6 side, and a TFT array for driving liquid crystal is formed on the surface of the transparent substrate 2 on the liquid crystal layer 6 side.
- the source bus lines 15 and the gate bus lines 16 form a matrix, and the TFT 10 is formed at the intersection.
- the drain electrode of the TFT is connected to the source bus line 15, the gate electrode is connected to the gate bus line 16, and the source electrode is connected to the pixel electrode 4.
- the pixel electrode 4 is made of an ITO thin film and is transparent and has a high light transmittance.
- FIG. 21 is a schematic perspective view of the knock light 51.
- knocklight 51 diffusion pattern
- the system uses a backlight that emits light.
- the light source uses LEDs that emit light in R, G, and B.
- the driving method of the liquid crystal element is the same as that of the pixel W described above. That is, in each pixel, a voltage corresponding to the color intensity RT is applied simultaneously with the start of the R field, a voltage corresponding to the color intensity GT is applied simultaneously with the start of the G field, and a color intensity BT is applied simultaneously with the start of the B field. A corresponding voltage is applied. Then, after the liquid crystal element is driven to a state where each color information can be displayed sufficiently, the backlight emits light corresponding to each color, and display is performed.
- the illumination is 1000 lux or more in a bright place and the illuminance is 1000 lux or less in a dark place under each environment. Observations were made. For example, when it is sunny and cloudy, it is a bright place outdoors and indoors, and it is a dark place indoors and at night. As a result of the comparison, the liquid crystal display device of the present invention provided with the light condensing element 8 showed good display in both the dark place and the bright place.
- the liquid crystal display device of the present invention that does not include the light condensing element 8 displays the same display as the liquid crystal display device of the present invention that includes the light condensing element 8 in a bright place, but has a little luminance in the dark place. A decrease was observed.
- the liquid crystal display device of the comparative example showed good display in a dark place, but was able to recognize almost no display image in a bright place.
- the liquid crystal display device of the present invention can be widely used for a liquid crystal television, a monitor, a mobile phone, a PDA, a notebook computer, and the like.
- a mopile device to effectively use a transflective configuration. it can.
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Priority Applications (2)
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US11/658,837 US8023074B2 (en) | 2005-01-12 | 2006-01-10 | Liquid crystal display unit |
JP2006552904A JP4642785B2 (ja) | 2005-01-12 | 2006-01-10 | 液晶表示装置 |
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JP2005-004740 | 2005-01-12 | ||
JP2005004740 | 2005-01-12 |
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US (1) | US8023074B2 (ja) |
JP (1) | JP4642785B2 (ja) |
KR (1) | KR100947680B1 (ja) |
CN (1) | CN100538468C (ja) |
WO (1) | WO2006075564A1 (ja) |
Cited By (4)
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CN102510428A (zh) * | 2011-12-21 | 2012-06-20 | 惠州Tcl移动通信有限公司 | 一种自动调节背光亮度的移动终端及方法 |
JP2012189625A (ja) * | 2011-03-08 | 2012-10-04 | Japan Display Central Co Ltd | 液晶表示パネル |
JP2015227911A (ja) * | 2014-05-30 | 2015-12-17 | 株式会社ジャパンディスプレイ | 表示装置及び方法 |
JP2016090812A (ja) * | 2014-11-05 | 2016-05-23 | 株式会社ジャパンディスプレイ | 表示装置 |
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Also Published As
Publication number | Publication date |
---|---|
KR100947680B1 (ko) | 2010-03-16 |
US8023074B2 (en) | 2011-09-20 |
US20090002597A1 (en) | 2009-01-01 |
CN100538468C (zh) | 2009-09-09 |
CN101061424A (zh) | 2007-10-24 |
JPWO2006075564A1 (ja) | 2008-06-12 |
JP4642785B2 (ja) | 2011-03-02 |
KR20070092731A (ko) | 2007-09-13 |
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