WO2005008323A1 - 液晶表示装置、バックライト装置 - Google Patents
液晶表示装置、バックライト装置 Download PDFInfo
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- WO2005008323A1 WO2005008323A1 PCT/JP2004/010094 JP2004010094W WO2005008323A1 WO 2005008323 A1 WO2005008323 A1 WO 2005008323A1 JP 2004010094 W JP2004010094 W JP 2004010094W WO 2005008323 A1 WO2005008323 A1 WO 2005008323A1
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- WIPO (PCT)
- Prior art keywords
- sheet
- optical sheet
- liquid crystal
- optical
- linear expansion
- Prior art date
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 91
- 230000003287 optical effect Effects 0.000 claims abstract description 164
- 230000005540 biological transmission Effects 0.000 claims description 41
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 229930182556 Polyacetal Natural products 0.000 claims description 3
- 229920006324 polyoxymethylene Polymers 0.000 claims description 3
- 229920002292 Nylon 6 Polymers 0.000 claims description 2
- 229920005668 polycarbonate resin Polymers 0.000 claims description 2
- 239000004431 polycarbonate resin Substances 0.000 claims description 2
- 229920005990 polystyrene resin Polymers 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 19
- 230000003068 static effect Effects 0.000 abstract description 19
- 230000037303 wrinkles Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000004417 polycarbonate Substances 0.000 description 7
- 229920000515 polycarbonate Polymers 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 5
- 229920001225 polyester resin Polymers 0.000 description 5
- 239000004645 polyester resin Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000003457 Shi epoxidation reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
-
- 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
- G02F1/133507—Films for enhancing the luminance
-
- 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
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
-
- 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
- G02F2203/60—Temperature independent
Definitions
- Liquid crystal display device backlight device
- the present invention relates to a backlight device having an optical sheet, and a liquid crystal display device.
- Fig. 6 (a) shows an example of a simple configuration of a backlight device used for a liquid crystal display device.
- the backlight device shown in FIG. 6 (a) includes a light source 11, a housing 12 that accommodates the light source 11 and has an open surface in front of which the light source 11 is radiated, and a light source light provided on the open surface.
- a direct-type backlight device comprising: an optical member 13 that transmits light to convert the light into light having a desired luminance distribution.
- the optical member 13 is formed of, for example, a prism sheet (optical sheet 14) for effectively guiding the light from the light source to the open surface, a diffusion plate (optical plate 15) for diffusing the light from the light source to improve the utilization efficiency.
- a liquid crystal panel (not shown) force S is provided on the open surface side of the housing 12, thereby forming a liquid crystal display device.
- the peripheral end of the optical member 13 is provided with some space x, y on the open surface of the housing 12. This is because the optical member 13 expands due to thermal expansion due to radiant heat from the light source 11 and heat rise due to various circuit driving when the backlight device is used for a liquid crystal display device. It has a space for the escape.
- the optical member 13 is also used in a large size, and the optical member 13 is thin as an optical sheet. What has low rigidity is used.
- the size of the liquid crystal display device having the configuration shown in FIG. 6 is increased, as shown in FIG. 7, a situation occurs in which the optical sheet 14 having a small thickness and rigidity forms a radius due to its own weight.
- a method is considered in which the space y shown in FIG. 6B is eliminated and the optical member 13 is sandwiched and held down. Cause ⁇ is formed.
- paper in this specification refers to a state in which the optical sheet has not stopped its radially extended state.
- the screens thus generated are partially blackened in the display unit ( ⁇ , portions) and not so, and portions (brightness, portions). This is the cause of uneven brightness.
- the optical sheet 14 is bent, the optical sheet 14 comes into contact with the liquid crystal panel.
- the touched portion becomes bluish on the screen (blue spots), causing color unevenness. This is a very serious problem in providing a high-quality liquid crystal display device.
- Patent Document 1 The configuration described in Patent Document 1 will be described with reference to FIG. While the thin and rigid optical sheet 14 shown in FIG. 6 is sandwiched between the relatively thick and rigid optical plates 16a and 16b, the heat of the optical sheet 14 and the optical plates 16a and 16b is formed on the open side of the housing 12.
- the optical member 14 is pressed down by the elastic member 17 designed so as not to hinder the expansion of the optical sheet 14 and the optical plates 16a and 16b due to heat. According to such a configuration, it is possible to prevent the formation of a shear due to its own weight and also to prevent the formation of a shear due to thermal expansion.
- Patent Document 1 JP-A-10-105074
- the optical sheet and the optical plate are generally formed of a dielectric material such as plastic, and the optical plate and the optical sheet are attracted by static electricity generated on the surfaces of the optical plate and the optical sheet. There is also a problem that the elongation action of the sheet is hindered.
- the liquid crystal display device has a configuration that is contrary to the demand for a thinner liquid crystal display device as described above, and the feature of using a thin optical sheet cannot be utilized.
- FIG. 9B is a view of the optical sheet as viewed from the front.
- the shape of the hole 18 for suspending the optical sheet 14 is made slightly larger than the size through which the holder 19 can penetrate so that elongation due to heat is not hindered, and A design has been devised that takes into account the elongation rate of 14.
- many efforts have been made to prevent the radius of the optical sheet due to the weight of the optical sheet and the formation of the optical sheet from being thermally elongated, and to provide a high-quality liquid crystal display device.
- FIG. 1 is a diagram showing a backlight device having a configuration different from that of FIG. 6, and includes a light source 1, a housing 2, a reflection plate 3, a diffusion plate 5, a reflection polarizing sheet 6, a prism sheet, 7 and has.
- the liquid crystal display device is configured by providing the liquid crystal panel 8 in the direct type backlight device.
- the reflective polarizing sheet 6 and the prism sheet may be relatively thin and have low rigidity like the optical sheet 14 instead of the relatively high rigidity such as the optical plate 15 in FIG.
- a plurality of light sources 1 are provided in a housing 2, and a reflector 3 is provided on an inner surface of the housing 2 opposite to the open surface.
- a diffusion plate 5 for diffusing the light from the light source 1, and selectively reflecting / transmitting the diffused light.
- a prism sheet 7 for effectively guiding the light transmitted through the reflective polarizing sheet 6 to the liquid crystal panel 8, and a liquid crystal panel 8 for displaying an image using the light guided by the prism sheet 7. .
- a reflective polarizing sheet is often used in a liquid crystal television or the like.
- the reason that a reflective polarizing sheet is used is that when it is introduced into a backlight device, it can selectively transmit polarized light in a specific direction among the light emitted from the light source.
- the selectively reflected light has an effect of reusing light that selectively retransmits polarized light in a specific direction again out of light that has once again become unpolarized due to the diffuse reflection effect of a reflector or the like inside the backlight.
- a protective sheet made of plastic or the like is provided in a state of being attached thereto, and it is often necessary to remove the protective sheet in a production process.
- the integrated reflective polarizing sheet 6 and the protective sheet are made of the same plastic, and there are many dipoles having positive and negative charges inside. For this reason, the work of peeling off the protective sheet loses the opposing positively or negatively charged electric charge on the peeled surface of each sheet and generates static electricity.
- the light source 1 provided in the backlight device is a fluorescent tube
- a high-frequency (about 10100 kHz) high voltage is generally applied, and such a component is close to such a component.
- Leakage current flowing to nearby conductors metal materials such as metal frames and shield plates
- Electrons are likely to float, and are likely to induce static electricity.
- the shear phenomenon of the reflective polarizing sheet occurs stochastically. This is because the amount of electrostatic charge is extremely uncertain, and the amount of electrostatic charge varies depending on the charging conditions in the surrounding atmosphere and the above-mentioned transport management conditions.
- the present invention is directed to a backlight device that provides a high-quality liquid crystal display device by preventing luminance unevenness and color unevenness which are serious problems in a liquid crystal display device. It has been made by trial and error in order to prevent the formation of a seal on the provided optical sheet.
- the present invention has a first linear expansion coefficient that is different from the second direction in the first direction and the second direction.
- a backlight device comprising: one optical sheet; and a second optical sheet disposed adjacent to the first optical sheet, wherein the first optical sheet has a linear expansion coefficient in the first direction, and The linear expansion coefficient of the optical sheet in a direction corresponding to the first direction is approximated.
- the backlight device includes a first optical sheet having a linear expansion coefficient equal to or greater than a predetermined value in a first direction, and a second optical sheet disposed adjacent to the first optical sheet.
- a reflective polarizing sheet is used for the first optical sheet, and any one selected from the group consisting of a prism sheet, a wave sheet, a diffusion sheet, and an ITO sheet is used for the second optical sheet.
- the direction is a transmission axis direction of the reflective polarizing sheet.
- the second optical sheet is formed of at least one material selected from the group consisting of a polycarbonate resin, a polystyrene resin, a polyacetal resin, and a nylon 6 resin.
- the invention is characterized in that the second optical sheet is arranged on the opposite side of the first optical sheet from a light source provided in the backlight device.
- a liquid crystal display device is characterized by comprising the backlight device and a liquid crystal panel irradiated with light from the backlight device.
- a liquid crystal display device is composed of the backlight device and the liquid crystal panel, a reflective polarizing sheet is used as the first optical sheet, and a transmission axis direction of the reflective polarizing sheet and a short side of the liquid crystal panel. It is characterized in that the directions are arranged in parallel.
- a liquid crystal display device is constituted by the backlight device and the liquid crystal panel, and the second optical sheet is a prism sheet or a wave sheet, and the arrangement direction of the prism or the wave is provided on the liquid crystal panel.
- the pixel is arranged to be rotated by a certain angle with respect to the vertical direction or horizontal direction which is the arrangement direction of the pixels, with the screen normal direction as an axis.
- the first optical sheet having a different linear expansion coefficient in two different directions has a larger linear expansion coefficient
- the second optical sheet adjacent to the first optical sheet having a larger expansion due to heat in the first direction Even in a situation where the optical sheet comes into close contact with the optical sheet due to static electricity, it is possible to prevent the formation of a seal on each optical sheet.
- first direction and the second direction in this specification are different directions.
- a liquid crystal display device shown in FIG. 1A will be described as an example.
- the configuration of the liquid crystal display device shown in FIG. 1A is as described above.
- the reflective polarizing sheet 6 and the prism sheet 7 are thin optical sheets having relatively low rigidity, and the normal directions of the respective surfaces. It is arranged adjacent to. In the ⁇ adjacent '' state, the reflective polarizing sheet 6 and the prism sheet 7 may be in contact with each other or may have a slight gap.In FIG. 1, a gap is provided for convenience of explanation. I have. Generally, they are in contact with each other (they can be separated).
- FIG. 1 (b) is a diagram showing an arrangement relationship between the reflective polarizing sheet 6 and the prism sheet 7 as viewed from the liquid crystal panel 8 side.
- the reflective polarizing sheet 6 is a multilayer structure of a thin film whose structure has orientation in a specific direction.
- the specific direction is the so-called transmission axis direction (first direction), and the linear expansion coefficient in the transmission axis direction is much larger than that in the reflection axis direction (second direction).
- first direction transmission axis direction
- second direction the linear expansion coefficient in the transmission axis direction
- D-BEF-M (registered trademark) manufactured by SLEM is used as the reflective polarizing sheet 6.
- Linear expansion coefficient of the transmission axis direction (first direction) of the sheet is about 7. 6 2 X 10- 5 ZK, the linear expansion coefficient of the reflection axis direction 2. a 29 X 10- 5 / ⁇ .
- the stiffness is small and is susceptible to the formation of the seal.
- an optical sheet having a large linear expansion coefficient in a specific direction such as the reflective polarizing sheet 6, which is thin and has relatively small rigidity
- a first optical sheet an optical sheet having a large linear expansion coefficient in a specific direction (transmission axis direction in the present embodiment), such as the reflective polarizing sheet 6, which is thin and has relatively small rigidity
- the thin optical sheet having a relatively small rigidity disposed adjacent to the first optical sheet is referred to as a second optical sheet (the prism sheet 7 in the present embodiment).
- the direction in which the linear expansion coefficient is large such as the transmission axis direction of the reflective polarizing sheet 6, is the first direction, and the linear expansion coefficient is small.
- the direction is defined as the second direction, and the horizontal direction when the reflective polarizing sheet 6 is arranged as shown in FIG. 1 (b) is the first direction (transmission axis direction), and the vertical direction is the second direction (reflection axis direction).
- the prism sheet 7 has substantially the same (slightly different) thermal expansion coefficients in each of the directions corresponding to the first direction and the second direction when it is disposed adjacent to the reflective polarizing sheet 6. The coefficient is smaller than that of the reflective polarizing sheet 6 in the transmission axis direction (first direction). Although the rigidity is small, it is generally slightly larger than that of the reflective polarizing sheet 6.
- the reflective polarizing sheet 6 and the prism sheet 7 are arranged adjacent to each other. Since the amount of extension of the polarizing sheet 6 in the transmission axis direction (first direction) is greater than the amount of extension of the prism sheet 7 in the direction corresponding to the transmission axis direction (first direction) of the reflective polarizing sheet 6, adhesion by electrostatic force is achieved. Accordingly, the elongation of the reflective polarizing sheet 6 in the transmission axis direction (first direction) is inhibited. Moreover, since the rigidity of the reflection polarizing sheet 6 is smaller than that of the prism sheet 7, a sheet is formed as shown in FIG.
- the formed screen causes uneven brightness on the display screen, and furthermore, the curved sheet comes into contact with the liquid crystal panel 8 to generate a bluish color stain.
- the reflective polarizing sheet 6 is in contact with the adjacent prism sheet 7 that has a large amount of elongation due to heat in the transmission axis direction (first direction). Focusing on the large difference in elongation between the optical sheets, we examined how the elongation rate (linear expansion coefficient) of each optical sheet could prevent the occurrence of shear.
- a sheet having a property of easily extending in one direction (transmission axis direction) such as the reflective polarizing sheet 6 is used, and when it is preferable to use this sheet in terms of optical characteristics, adjacent sheets are used. It is conceivable to change the seat design.
- the reflection polarizing sheet 6 of the prism sheet 7 is used.
- the prism sheet 7 is formed of a material having substantially the same extension as the transmission axis direction (first direction) of the reflective polarizing sheet 6 (first optical sheet) in the direction corresponding to the transmission axis direction (first direction). It was decided to. [0050] This is because, as described above, the reflective polarizing sheet 6 has different linear expansion coefficients in two directions, and the amount of extension in the transmission axis direction having a large linear expansion coefficient is a major factor that causes shear.
- the prism sheet 7 was formed of a material having a value close to the linear expansion coefficient of about 8 ⁇ 10 5 / K in the transmission axis direction of the reflective polarizing sheet 6.
- Plastic performance table (technical data: "Sumipex Technical Data small book (Sumitomo Chemical acrylic Division issued)" from)
- the thermal expansion coefficient is 6- 10 X 10- 5 about ⁇ of material (polystyrene (6- 8 X 10- 5 ⁇ ) , polyacetal (8. 1 X 10- 5 ⁇ ) polycarbonate (6. 6 X 10 "5 / ⁇ ), nylon 6 (8. 3 X 10" 5 / It is preferable to form them by K))) or the like.
- the prism sheet 7 was formed of a polycarbonate (PC) -based resin, and the occurrence of shear in the transmission axis direction (first direction) of the reflection / polarization sheet 6 was performed.
- a polyester resin as a comparative Target Sanpunore the Suriemu made prism sheet "RBE F90 / 50-8TJ (registered trademark)" 90 / 50-8T "type series (linear expansion coefficient 2. 25 X 1 0- 5 / Using ⁇ ), the number of occurrences of shear was considered.
- the reflection polarizing sheet 6 has a feature that the shear phenomenon occurs stochastically due to an uncertain factor such as static electricity, a frequency test (a test number of 20 Times).
- a frequency test (a test number of 20 Times).
- the number of shearing phenomena of the reflective polarizing sheet 6 that would affect the brightness unevenness of the liquid crystal screen was 1/20 when using a PC-based resin as the prism sheet. If the prism sheet 7 is made of PC resin, the linear expansion coefficient of the prism sheet 7 is closer to the linear expansion coefficient of the reflective polarizing sheet 6 in the transmission axis direction (first direction). It was confirmed that the frequency of causing the shiny phenomenon of the reflective polarizing sheet 6 was reduced.
- the difference in the extension amount between the prism sheet 7 and the reflective polarizing sheet 6 (the length in the first direction is 400 mm, and the temperature change range is 60 ° C-10 ° C (displayed when the power is turned on)
- the temperature change range assuming the maximum range of temperature rise change until the temperature environment of the device becomes constant)
- the polyester resin (PE) used for the prism sheet 7 can be compared.
- the linear expansion coefficient is 1 ⁇ 5- 3 X 10- 5 / ⁇ , if the average value is 2.25 elongation amount of X 10- 5 / kappa about 0. 45 mm by the following calculation formula and you calculated in (elongation The rate is obtained as 0.1.
- the linear expansion coefficient of the PC resin is 6.6 ⁇ 10—so K, and when calculated, the sheet under the same conditions has an elongation amount of about 1.3 lmm (elongation rate of 0.33).
- the difference in elongation in the transmission axis direction between the polyester resin and the reflective polarizing sheet is as follows. more formula, about 1. 07mm (elongation index difference 0.27, difference of linear expansion coefficient of 5. 37 X 10- 5 ZK).
- the prism sheet 7 is preferably formed of a PC-based resin rather than a polyester resin, thereby reducing the frequency of occurrence of the sheet of the reflective polarizing sheet 6.
- FIG. 10 shows the relationship between the frequency of shear in the temperature environment test and the difference between the linear expansion coefficient of the reflective polarizing sheet 6 in the direction of the reflection axis and the linear expansion coefficient of the prism sheet 7.
- the vertical axis represents the frequency of occurrence of shies
- the horizontal axis represents the difference in linear expansion coefficient between the prism sheet and the reflective polarizing sheet in the transmission axis direction.
- the occurrence mechanism of streaking occurs stochastically. Assuming that the raw frequency changes while increasing it, we assumed and created a curve along the power approximation formula as shown in the figure.
- the direction is the transmission axis direction (first direction) in the horizontal direction and the direction of the reflection axis (second direction) in the vertical direction as shown in FIG.
- the second direction reflection axis direction
- the first direction transmission axis direction
- the transmission axis direction (first direction) in the horizontal direction and the vertical direction In the arrangement method in which the direction of the reflection axis (second direction) is longer, the longer the length of the reflective polarizing sheet in the lateral direction and the longer the length of the adjacent optical sheet can be made to correspond to each other. The effect of suppressing this is high and is often the case.
- the reflective polarizing sheet 6 and the prism sheet 7 described in the present embodiment are the same as the prism sheet in which the reflective polarizing sheet 6 has a large elongation rate (linear expansion coefficient) in a specific direction (transmission axis direction). Since the rigidity is smaller than 7, the reflective polarizing sheet 6 is apt to become narrow due to two causes, elongation due to heat and close contact due to static electricity.
- the reflective polarizing sheet 6 is used as the first optical sheet and the prism sheet 7 is used as the second optical sheet.
- the first optical sheet is large in a specific direction (first direction).
- Linear expansion coefficient (over predetermined value: For example, linear expansion coefficient 5.0 X 10_ 5 / K (elongation amount is particularly problematic.) Case)
- the second optical sheet an optical sheet disposed adjacent to the first optical sheet is used.
- the formation of a sheet on a sheet can be effectively prevented, and is not limited to the optical sheet described in the present embodiment.
- the second optical sheet include a wave sheet, a diffusion sheet, and an ITO sheet.
- the wave sheet is used for the same purpose as the prism sheet 7, and can be used instead of the prism sheet 7.
- a diffusion sheet may be used instead of the prism sheet 7, and if it is used instead of the prism sheet 7 in Fig. 1 (a), it will be adjacent to the reflective polarizing sheet 6, so that the present invention is applied. Cope with power S.
- the ITO sheet is used to unify the ground of the optical sheet in the panel to the casing 2 and suppress the screen beat. Therefore, it is often the case that the ITO sheet is used in the configuration of FIG. 1 (a).
- the ITO sheet has a thin metal film attached to one side (panel side), and the metal sheet at the end holds it down to unify the housing 2 and the ground. It is difficult to completely remove, and it is preferable to prevent the formation of a screen by the present invention even when ⁇ ⁇ ⁇ is disposed adjacent to the first optical sheet.
- optical sheet as in the present invention, even if no static electricity is generated, no screen is formed (only the sheet is stretched by heat). Not too long.
- a reflective polarizing sheet is used for the first optical sheet
- a prism sheet or a wave sheet is used for the second optical sheet
- the second optical sheet 7 is used for the adjacent reflective polarizing sheet 6.
- the reason is to reduce color unevenness on the screen due to contact between the reflective polarizing sheet 6 and the liquid crystal panel 8. That is, for example, if the diffuser plate 5 is bent toward the liquid crystal panel side for some reason and the reflection / polarization sheet 6 is directly in contact with the liquid crystal panel 8, the difference between the partially contacted portion and the non-contact portion A color difference of the display screen occurs between them, causing color unevenness.
- the reflective polarizing sheet 6 has heat generated from the light source 1 and the like, but the way of transmitting heat to the liquid crystal panel 8 is different between the contact portion and the non-contact portion between the liquid crystal panel 8 and the reflective polarizing sheet 6. Occurs.
- a second optical sheet 7 typified by a prism sheet or a wave sheet is provided between the liquid crystal panel 8 and the reflection polarization sheet 6. Placed on the side. Accordingly, since the prism surface of the prism sheet 7 or the wave surface of the wave sheet has irregularities, the contact area with the liquid crystal panel 8 can be reduced, and thermal contact between the two can be minimized. Therefore, it is possible to prevent local heat transfer to the liquid crystal panel surface, and it is possible to prevent color spots and color unevenness on the display screen.
- the present embodiment has the following configuration.
- FIG. 4 is a view showing the relationship between the second optical sheet and the liquid crystal panel 8 according to the present example.
- the pixels constituting the liquid crystal panel are generally arranged in a matrix (two-dimensionally in the vertical and horizontal directions) as indicated by reference numeral 8a (see FIG. 4). Signs 8a_l and 8a_2 respectively).
- reference numeral 7a in FIG. 4 the arrangement direction of the prisms or waves is not aligned with the vertical direction or the horizontal direction, and is arranged with a constant rotation angle around the screen normal direction. (Reference numeral 7a-1 in FIG. 4).
- the transmission axis direction in which the thermal expansion is remarkable so as to correspond to the short side direction of the display screen.
- the thermal expansion of the reflective polarizing sheet 6 in the long side direction of the screen can be minimized by setting the short side direction as much as possible in the direction in which the thermal expansion is easily performed.
- the transmission axis of the polarizing glass facing the backlight among the polarizing glasses included in the liquid crystal panel 8 is set in the short side direction in accordance with the transmission axis of the reflective polarizing sheet 6.
- FIG. 5 is a diagram showing a configuration example of the backlight device according to the present embodiment.
- the liquid crystal display device has a light source 1, a housing 2, a reflector 3, a light guide 4, a reflective polarizing sheet 6, and a prism sheet 7.
- the backlight device is provided with a liquid crystal panel 8 to constitute a liquid crystal display device.
- the difference from FIG. 1 is that the light guide plate 4 is used to reduce the number of light sources 1.
- the liquid crystal display device includes, for example, a light source 1 disposed on each of both end surfaces of a backlight device, a light guide plate 4 for equalizing the light from the light source 1, and a light guide plate 4.
- a planar reflector 3 that is arranged on one side (rear side) of the light plate 4 and reflects light toward the light guide plate 4, a housing 2 for accommodating these, and is disposed on the other surface (front side) of the light guide plate 4
- Light guide plate 4 A reflective polarizing sheet 6 for selectively reflecting / transmitting light, a prism sheet 7 for effectively guiding the light transmitted through the reflective polarizing sheet 6 to the liquid crystal panel 8, and an image display is performed by the light guided by the prism sheet.
- the liquid crystal panel 8 is arranged. The light introduced into the light guide plate 4 from the end face where the light source 1 is arranged is emitted to the other surface (front surface) while totally reflecting inside the light guide plate 4.
- the material of the prism sheet 7 has substantially the same thermal expansion rate (linear expansion coefficient) as the transmission axis direction of the reflective polarizing sheet 8. Is preferably about 6-9 X 105 ZK.
- the specific material forming the prism sheet 7 is the same as that of the first embodiment, and the second optical sheet may include any of a prism sheet, a wave sheet, a diffusion sheet, and an IT sheet. ,. Also, as for the position of the sheet, similarly to the above, the state in which the sheet is sandwiched between the reflective polarizing plate 6 and the liquid crystal panel 8 can eliminate the color spots and unevenness of the liquid crystal panel 8. It is effective.
- the backlight device and the liquid crystal display device of the present invention can be applied to a liquid crystal television and the like.
- FIG. 1 (a) is a cross-sectional view showing a configuration example of the liquid crystal display device according to the first embodiment of the present invention.
- FIG. 2B is a diagram showing an arrangement relationship between the first optical sheet and the second optical sheet as viewed from the liquid crystal panel side in the liquid crystal display device according to the first embodiment of the present invention.
- FIG. 2 (a) is a front view showing a state where the first optical sheet and the second optical sheet are bent. (b) It is a top view showing a state when the first optical sheet and the second optical sheet are bent.
- FIG. 3 (a) is a front view showing a state where the first optical sheet and the second optical sheet when the present invention is applied are stretched. (B) It is a top view which shows the mode when the 1st optical sheet and the 2nd optical sheet at the time of applying this invention are extended.
- FIG. 4 is a diagram showing an example of an arrangement relationship between a liquid crystal panel and a second optical sheet of a liquid crystal display device according to a second embodiment of the present invention.
- FIG. 5 is a sectional view showing a configuration example of a liquid crystal display device according to a third embodiment of the present invention.
- FIG. 6 (a) is a cross-sectional view illustrating a configuration example of a conventional liquid crystal display device.
- FIG. 4B is a cross-sectional view illustrating an arrangement relationship between the optical sheet and the housing.
- Garden 7 is a cross-sectional view showing a state where an optical sheet is bent in a conventional liquid crystal display device.
- FIG. 9 (a) is a cross-sectional view showing a state where an optical sheet is suspended in a conventional liquid crystal display device.
- (b) is a front view showing a state of an optical sheet used in a suspended state in a conventional liquid crystal display device.
- Garden 10 is a diagram showing the relationship between the frequency of occurrence of shear in a temperature environment test and the difference between the linear expansion coefficient of the reflective polarizing sheet in the direction of the reflection axis and the linear expansion coefficient of the prism sheet.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04747560A EP1653277A4 (en) | 2003-07-16 | 2004-07-15 | LIQUID CRYSTAL DISPLAY AND BACKLIGHT DEVICE |
US10/564,391 US20070189024A1 (en) | 2003-07-16 | 2004-07-15 | Liquid crystal display device and backlight unit |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-275140 | 2003-07-16 | ||
JP2003275140 | 2003-07-16 | ||
JP2004204443A JP2005050802A (ja) | 2003-07-16 | 2004-07-12 | 液晶表示装置、バックライト装置 |
JP2004-204443 | 2004-07-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005008323A1 true WO2005008323A1 (ja) | 2005-01-27 |
WO2005008323A8 WO2005008323A8 (ja) | 2005-03-31 |
Family
ID=34082353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/010094 WO2005008323A1 (ja) | 2003-07-16 | 2004-07-15 | 液晶表示装置、バックライト装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070189024A1 (ja) |
EP (1) | EP1653277A4 (ja) |
JP (1) | JP2005050802A (ja) |
TW (1) | TWI291061B (ja) |
WO (1) | WO2005008323A1 (ja) |
Cited By (3)
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JP2006318668A (ja) * | 2005-05-10 | 2006-11-24 | Sony Corp | 面状照明装置及び液晶表示装置 |
JP2007024913A (ja) * | 2005-07-12 | 2007-02-01 | Sharp Corp | 液晶表示装置 |
CN102472453A (zh) * | 2009-07-30 | 2012-05-23 | 夏普株式会社 | 边光式照明装置、液晶显示装置以及电视接收装置 |
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KR100637189B1 (ko) * | 2004-11-18 | 2006-10-23 | 삼성에스디아이 주식회사 | 평판표시장치 |
KR101263498B1 (ko) * | 2005-10-31 | 2013-05-13 | 엘지디스플레이 주식회사 | 백라이트 유닛 |
KR100793581B1 (ko) * | 2006-08-29 | 2008-01-14 | 엘지이노텍 주식회사 | 백라이트 유닛 및 이를 이용한 디스플레이 장치 |
CN101363995B (zh) * | 2007-08-08 | 2011-11-09 | 清华大学 | 背光模组 |
JP2011003506A (ja) * | 2009-06-22 | 2011-01-06 | Casio Computer Co Ltd | 面光源 |
JP6207117B2 (ja) * | 2011-07-19 | 2017-10-04 | スリーエム イノベイティブ プロパティズ カンパニー | 面光源装置 |
US9618689B2 (en) | 2012-09-28 | 2017-04-11 | Apple Inc. | Electronic devices with displays having attached optical films |
US11409157B2 (en) * | 2016-04-29 | 2022-08-09 | Dai Nippon Printing Co., Ltd. | Image source unit and display device |
JP6678638B2 (ja) * | 2017-12-28 | 2020-04-08 | 恵和株式会社 | バックライトユニット及び液晶表示装置 |
KR20210076657A (ko) | 2019-12-16 | 2021-06-24 | 엘지디스플레이 주식회사 | 표시장치 |
CN111505863A (zh) * | 2020-03-27 | 2020-08-07 | 深圳市晶泰液晶显示技术有限公司 | 一种防漏光的手机液晶显示屏 |
JP7468165B2 (ja) * | 2020-06-05 | 2024-04-16 | 船井電機株式会社 | 発光装置および表示装置 |
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Also Published As
Publication number | Publication date |
---|---|
JP2005050802A (ja) | 2005-02-24 |
EP1653277A1 (en) | 2006-05-03 |
EP1653277A4 (en) | 2008-06-04 |
TW200517735A (en) | 2005-06-01 |
TWI291061B (en) | 2007-12-11 |
WO2005008323A8 (ja) | 2005-03-31 |
US20070189024A1 (en) | 2007-08-16 |
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