WO2004020899A1 - 照明装置及び液晶バックライト装置 - Google Patents
照明装置及び液晶バックライト装置 Download PDFInfo
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- WO2004020899A1 WO2004020899A1 PCT/JP2003/010458 JP0310458W WO2004020899A1 WO 2004020899 A1 WO2004020899 A1 WO 2004020899A1 JP 0310458 W JP0310458 W JP 0310458W WO 2004020899 A1 WO2004020899 A1 WO 2004020899A1
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- WIPO (PCT)
- Prior art keywords
- optical member
- opening
- liquid crystal
- locking piece
- casing
- Prior art date
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Classifications
-
- 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
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
-
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- 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
- G02F1/133604—Direct backlight with lamps
-
- 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
- G02B6/0051—Diffusing sheet or layer
-
- 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
- G02F1/133608—Direct backlight including particular frames or supporting means
Definitions
- the present invention relates to a lighting device and a liquid crystal display device using the same, and more particularly to a backlight device for a large-sized liquid crystal display device.
- an optical sheet 1 and a diffusion plate 2 both are also collectively referred to as “optical members”.
- An opening 2a is provided on each side of one upper part, and a locking piece 3a is provided at a position corresponding to the opening 2a of the frame 3 for holding the optical member, so that the optical member is provided.
- optical member An optical sheet and a diffusion plate (hereinafter referred to as an “optical member”, but any one of the optical sheet and the diffusion plate is also referred to as an optical member) on both upper sides of the screen of the liquid crystal display device.
- optical member any one of the optical sheet and the diffusion plate is also referred to as an optical member
- the position of the opening is located on both sides of the lower half area of the screen. If the hole is located on the lower side of the screen, especially when the optical sheets and the diffuser are large (when the screen is enlarged), the holes may not be able to withstand the weight of the optical members (optical sheets and the diffuser). Ribber tends to be bent Become.
- the diffusion plate locally contacts the liquid crystal panel via optical sheets, and is diffused into the liquid crystal panel by heat conduction from the diffusion plate to the liquid crystal panel.
- a temperature difference is generated between a portion in contact with the plate and a portion not in contact with the plate, and this causes unintended luminance unevenness and contrast unevenness on the liquid crystal panel, there is a problem.
- problems may occur in the structure of the device or in the manufacturing process.
- An object of the present invention is to provide a structure in which an optical member is less likely to warp or bend even when a display is rotated, and to reduce uneven display brightness and the like.
- an optical member a casing in which the optical member and the lamp are disposed, a first member provided on the optical member, and a first member provided on the casing side.
- a second member for attaching the optical member to the casing in cooperation with a first member comprising: a basic position of the lighting device; and the light source from the basic position.
- the optical device At any of the first stop positions when the device is rotated in the display surface direction, the optical device is vertically lower than the optical member on the lower side of the display screen with respect to the center of gravity with respect to the center of gravity.
- a lighting device is provided, wherein the first member and the second member are provided at positions where a stress due to the weight of the member is not applied.
- the first member may be, for example, an opening (hole) formed in the optical member, and the second member may be an opening for locking the optical member to the casing.
- One piece is fine.
- an optical member a casing in which the optical member and the lamp are arranged, a first member provided on the optical member, and a first member provided on the casing side.
- the first member and the second member are located at a position on the lower side of the display screen in the vertical direction where no stress due to the weight of the optical member is applied vertically upward to the optical member.
- a lighting device characterized by comprising:
- the optical member is unlikely to be bent even when rotated to a position different from the basic position.
- the state where the end of the opening or the cutout located at the lower side of the non-effective screen range of the liquid crystal display device and the locking piece are not in contact with each other is within the normal use condition range of the liquid crystal display device.
- the end of the opening or the cutout of the optical member is not locked within a range of expansion of the optical member caused by at least one of thermal expansion and moisture absorption of the optical member. It is preferable that spatial freedom is given between the end of the opening or the notch and the locking piece.
- an optical member provided with a plurality of openings or cutouts including a lower side and an upper side of a center of gravity, a lamp, and an abutment with the opening or cutout.
- a liquid crystal display device including: a liquid crystal backlight device characterized by being designed not to rotate; a liquid crystal display device including a liquid crystal panel provided on a side opposite to the lamp with the optical member interposed; A rotating mechanism for rotating the liquid crystal display device, comprising: It is provided.
- a clear display can be performed at any rotational position.
- the optical member includes an optical member, and a casing in which the optical member and the lamp are arranged, and the optical member is perpendicular to the center of gravity in accordance with the rotation thereof.
- a lighting device which can be locked at an upper side and a lower side in a direction, and is not subjected to a vertically upward stress below the center of gravity in a vertical direction below the center of gravity. No matter where the lighting device is rotated, the effect of its own weight can be reduced.
- Disupureigaa; Rayuru have an arrangement direction, and this to prevent deformation such as anti-Ri ⁇ Mi optical sheet acids and diffusion plate capable ing.
- FIG. 1 (A) and 1 (B) are diagrams for briefly explaining the principle of a liquid crystal backlight device according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view showing a configuration example of the liquid crystal backlight device according to the first embodiment of the present invention.
- FIG. 3 (A) is a front view of the liquid crystal backlight device of FIG. 2, and FIG. 3 (B) is a cross-sectional view taken along the line 1 1 1 1 1 1 1 of FIG. 3 (A). is there.
- FIGS. 4 (A) and 4 (B) are diagrams showing a configuration example of a liquid crystal backlight device according to the first embodiment of the present invention, in which the liquid crystal display device is rotated to various angles.
- FIG. 3 is a diagram illustrating a configuration.
- FIGS. 5 (A) and 5 (B) are diagrams showing a configuration example of a liquid crystal backlight device according to the first embodiment of the present invention, in which the liquid crystal display device is rotated to various angles.
- FIG. 3 is a diagram showing the configuration of FIG.
- FIG. 6 is an exploded perspective view showing a configuration example of a liquid crystal backlight device according to a first modification of the first embodiment of the present invention.
- FIG. 7 (A) is a front view of the liquid crystal backlight device of FIG. 6, and FIG. 7 (B) is a cross-sectional view of FIG. 7 (A) taken along the line VII-VII.
- FIG. 8 is an exploded perspective view showing a configuration example of a liquid crystal backlight device according to a second modification of the first embodiment of the present invention.
- FIG. 9 (A) is a front view of the liquid crystal backlight device of FIG. 8, and FIG. 9 (B) is a sectional view taken along line IX-IX of FIG. 9 (A).
- FIG. 10 is an exploded perspective view showing a configuration example of a liquid crystal backlight device according to a second embodiment of the present invention.
- FIG. 11 (A) is a front view of the liquid crystal backlight device of FIG. 10, and FIG. 11 (B) is a cross-sectional view taken along line XI-XI of FIG. 11 (A). .
- FIGS. 12 (A) and 12 (B) show a third embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration example of a liquid crystal backlight device according to the present invention.
- FIG. 13 is a diagram showing a configuration example of an optical member (diffusion plate) in a liquid crystal backlight device according to a fourth embodiment of the present invention.
- FIG. 14 is an exploded perspective view showing a configuration example of a general liquid crystal backlight device.
- FIG. 15 (A) is a front view of the liquid crystal backlight device of FIG. 14, and FIG. 15 (B) is a cross-sectional view taken along line XV-XV of FIG. 15 (A).
- FIG. 16 (A) is a front view of the liquid crystal television according to the present embodiment
- FIG. 16 (B) is a rear view of the liquid crystal television according to the present embodiment.
- FIG. 17 is a diagram showing an example of the relationship between the number of days left and the water absorption when the optical member is submerged in water.
- FIG. 18 is a diagram showing an example of the relationship between the saturated water absorption of the optical member and the length increase rate.
- the upper side of the display screen indicates the upper side in the vertical direction with respect to the center of gravity of the optical member.
- the opening and the locking piece are generally provided at the edge of the display screen, the upper edge of the display screen (frame) ) Or the lower margin (frame).
- the casing refers to all or a part of a frame, a shield, a reflection plate, a lamp holder, and the like, and a locking piece is provided on the casing side. It also includes the state where no lamp is arranged.
- the rotary liquid crystal television 100 has a main body 101 and a stand 103.
- the main body 101 has a display screen 102, a frame 105, and various operation buttons 107 provided on the frame 107.
- the main body 101 and the stand 103 are connected by a support 103a.
- the support portion 103a and the main body portion 101 are connected by a rotating mechanism 115, and the display is turned on. It is rotatable in the plane of the screen 102.
- the stop positions include at least two stop positions, a first stop position 101a and a second stop position 101b, and the television is displayed on a vertically and horizontally long screen. You can enjoy watching.
- FIGS. 1 (A) and 1 (B) a study performed by the present invention will be described with reference to FIGS. 1 (A) and 1 (B).
- the inventor of the present invention has shown that in a device capable of rotating the liquid crystal display device and displaying a screen at a plurality of stop positions, the warp or radius of the optical member is reduced at each of the stop positions. We thought it was necessary to alleviate this and reduce display unevenness.
- Fig. 1 (A) As shown in Fig. 1 (A), it is attached to a frame (not shown) and has openings 2a_1 (upper two forces) at four places on the upper and lower sides of the optical member (optical sheets), for example. Place) and the opening 2a_2 (the lower two places). Further, a locking piece provided on the frame for supporting the optical member 1 with the frame is provided in the opening 2a-2 so as to be able to be inserted in a loose fit state.
- openings 2a_1 upper two forces
- the opening 2a_2 the lower two places
- the positional relationship between the vertically lower opening and the locking piece is A state in which the upper outer peripheral portion of the locking piece does not contact the upper inner peripheral edge of the opening within the normal use range conditions of the liquid crystal display device ( With beauty is loosely state) to fit force, or stress is applied in a direction shrinks in the vertical direction against the optical member in a case that even contact, deflection counter if Re the optical member It is preferable that the contact state is such that no abrasion occurs (sub-condition 2). Since optical members such as optical sheets and diffusion plates cause thermal expansion due to a rise in temperature, it is preferable that conditions 1 and 2 be satisfied even when thermal expansion occurs.
- the optical member for example, the opening 2a-3 and the opening 2a-4 at the four upper, lower, right and left places, respectively, and the locking pieces 3a to 3a provided on the frame _ 4, and the locking pieces 3 a-3, 3 a-4 for supporting the optical member with the frame are provided.
- condition 2 it is preferable that the conditions 1 and 2 are satisfied even when the thermal expansion occurs.
- Whether the opening and the locking piece are provided on the upper and lower sides or on the left and right and up and down may be appropriately determined depending on the position to which the liquid crystal display device is rotated and the liquid crystal display device may be stopped at the rotation position.
- the distance between the upper edge and the lower edge of the opening is d 1
- the distance (thickness) between the outer edge and the outer edge of the locking piece is d 2.
- the upper inner edge of the opening 2a-1 into which the opening 2a — 1 ⁇ locking piece 3a-1 is inserted, the locking piece 3a-1 and the upper outer periphery are in contact.
- the diffuser 2 is attached to the frame 3 by contact.
- the distance y 'between the lower end of the inner circumference of the opening 2a-2 and the lower end of the outer circumference of the locking piece 3a-2 is expressed by the following equation.
- L 1 is the distance from the upper edge of the upper opening 2a_1 to the lower edge of the lower opening 2a-2.
- L2 is the distance from the upper end of the outer periphery of the upper locking piece 3a-11 to the lower end of the outer circumference of the lower locking piece 3a-11.
- the diffusion plate 2 can be used within the normal use range of the liquid crystal display device (generally, heat generated by operating the lamp for a long time). Assume that you have grown the most. Let L 1 'be the distance from the upper edge of the upper opening 2a-1 to the lower edge of the lower opening 2a-2 when the diffusion plate 2 extends the largest in the range of use.
- t 2 is the distance between the lower ends of the left and right openings 2 a — 3, 2 a — 4 and the lower ends of the locking pieces 3 a — 3, 3 a — 4 when the diffusion plate is extended most. Is the distance between
- the play in the openings (2a-3 and 2a_3 or 2a-4 and 2a-4) that are vertically adjacent to each other, and the opening (2 The play between a-3 and 2a-1) may be designed according to the extension of the diffusion plate 2. From Fig. 1 (B), it is expressed by the following equation.
- W 3 -W 4> AW x (W 3) AW x (W4) (9 — 6)
- W 1 is the distance between the insides of the upper (lower) adjacent locking pieces (normally)
- W 2 is the distance between the insides of the upper (lower) adjacent openings (at normal times)
- W 3 is the distance between the inner sides of the left and right facing locking pieces (at normal times).
- W 4 is the distance (usually) between the insides of the left and right facing holes.
- ⁇ W X (W 11) is the maximum amount of extension with respect to the length W n (n represents the above-mentioned stroke).
- the positional relationship between the opening of the diffusion plate 2 and the locking piece 3 may be designed.
- the liquid crystal display buckle In the case where is rotated 90 degrees in the plane, the calculation can be performed in the same way with the correspondence.
- the optical sheet 1 can be designed in the same manner as the diffuser plate 2 described above.
- plastic materials have the property of expanding with heat, and the higher the temperature, the greater the elongation. Therefore, it is necessary to consider this property when designing the position of the opening of the diffusion plate 2. If there is not enough spatial degree of freedom (gap) between the diffusion plate 2 and the locking piece at room temperature, the interval between the left and right openings in the diffusion plate 2 increases. If this interval is longer than the interval between the left and right locking pieces, the holes of the diffusion plate will hit the locking pieces, and the diffusion plate 2 may be deformed (due to warping or the like). . For this reason, it is preferable to estimate the gap distance (play) between the opening of the diffusion plate 2 and the locking piece as follows.
- the linear expansion coefficient representing the stretchability of the plastic with temperature (unit: 1 0 5) is employed.
- the coefficient of linear expansion is assumed to be constant with temperature, and the coefficient of linear expansion of the acryl material is assumed to be about 7.0.
- the ambient temperature of the diffuser is 60 ° C at the maximum considering the operating temperature range of the liquid crystal panel. Considering such a temperature environment, it is estimated that the distance between the two holes on the left and right sides of the diffuser will be longer than that at room temperature by the following calculation method.
- the distance between the holes of the diffusion plate 2 is calculated to be about 0.6 mm longer than the room temperature in the horizontal direction. Therefore, even when the diffusion plate 2 is extended by about 0.6 mm in the horizontal direction, the opening between the diffusion plate 2 and the locking piece is prevented from contacting the locking piece. If the gap is designed to be provided, the opening and the locking piece come into contact with each other due to the thermal expansion of the diffusion plate 2, and the locking piece presses the inner edge of the opening. The warpage of the diffusion plate 2 can be prevented. A similar estimate can be made for the vertical direction. In reality, by performing verification by a temperature test using an actual sample, it is possible to reliably prevent the warpage of the optical member. However, in order to prevent the optical member from warping, the above-described method is used. That is, in order to prevent the optical member from warping due to thermal expansion of the diffusion plate, the opening and the locking piece must be used. The necessary air gap between and can be estimated at the design stage.
- FIGS. 2 to 3 are diagrams showing the structure of the liquid crystal backlight device
- FIG. 2 is an exploded perspective view of the direct type liquid crystal backlight device
- (A) is a front view showing the structure excluding a part of the optical sheets and the diffusion plate.
- FIG. 3 (B) is a view taken substantially along the line II-II of FIG. 3 (A).
- FIG. 4 is a cross-sectional view taken along the line, and is a cross-sectional view showing a structure in which a diffusion plate, optical sheets, a liquid crystal panel, and a frame for holding the liquid crystal panel are added. As shown in FIGS.
- the knock light device mainly includes various optical sheets 1, a diffusion plate 2, a shield 3, and a It comprises a lamp 4, a lamp holder 5, a reflector 6, and a liquid crystal panel 7.
- the optical sheets 1 and the diffusion plate 2 are provided with openings 2 a (8 holes on the optical sheet side and the diffusion sheet side, respectively) on each edge of the ineffective display screen area. I have.
- the shield 3 and the lamp holder 15 are provided with a locking piece 3a at a position corresponding to the opening 2a so as to penetrate the opening 2a.
- the locking piece 3a is Instead of the lamp 5 or together with the lamp holder 5, the shield 3 may be provided on the side, for example.
- the locking piece 3a and the opening 2a contact at least at the lower opening 2a in the vertical direction.
- the design shall be made in consideration of the positional relationship between the locking piece 3a and the opening 2a so that the optical sheet 1 or the diffusion plate 2 will not bend even if it comes into contact. This can prevent the optical sheets 1 or the diffusion plate 2 from being bent or deformed by its own weight, for example.
- the optical sheets 1 or the diffusion plate 2 are locked on the lower side in the vertical direction of the display, the optical sheets 1 or the diffusion sheet 1
- the point of action when deformation occurs on the plate 2 is the locking position, and the reaction force is applied to the upper side of the fulcrum, that is, the entire screen, and deformation such as bending occurs.
- the position vertically locked by the locking piece 3a is higher in the vertical direction of the display screen than in the region affected by the reaction force, that is, higher than the locking position. Area becomes narrow, and deformation due to its own weight becomes difficult to occur. In particular, when the optical sheets 1 or the diffusion plate 2 is locked in the opening formed in the non-effective screen area, even if the display area is increased, the bending due to their own weight hardly occurs.
- FIG. 4 and FIG. 5 are diagrams schematically showing a positional relationship between the optical member, the opening, and the locking piece when the liquid crystal backlight device is rotated in a plane.
- FIG. 4 (B) When the LCD backlight device is rotated 180 degrees (upside down) as shown in FIG. 4 (B) from the basic position shown in FIG. 4 (A), FIG. A) The position of the opening and the locking piece when rotated 90 degrees clockwise as shown in Fig. 5 (B), and when rotated clockwise 270 degrees as shown in Fig. 5 (B).
- the upper inner peripheral edge of the vertically upper opening portion and the upper outer peripheral portion of the engaging piece engaged therewith are in a state of contact with each other.
- the inner peripheral edge of the opening on the lower side in the direction does not come into contact with the engaging piece that engages with the inner peripheral edge, or even if it does, there is almost no force to press the optical member. . If you do this, Even when rotated 90, 180 and 270 degrees from the basic position, the optical member is not easily bent.
- liquid crystal backlight devices shown in FIGS. 2 to 5
- two openings are provided on each side of each side, but optical sheets are not provided.
- the number of openings at each edge may be increased or decreased as appropriate according to the length of the side of 1 or the diffusion plate 2 and the stability of the locking state.
- FIGS. 6 to 7 (B) are views corresponding to FIGS. 2 to 3 (B), in which the opening 2 a and the locking piece 3 a are provided at the four corners of the backlight unit. It is a figure which shows the example of a structure of the liquid crystal pack writer provided in one place each. According to this configuration, as shown in FIGS. 6 to 7 (B), in the liquid crystal backlight device according to the present modification, openings 2 a are formed on both sides with respect to one edge.
- FIG. 8 to FIG. 9 (B) are diagrams showing a configuration example of a liquid crystal backlight device according to a second modification of the first embodiment of the present invention.
- two locking pieces are provided on each of the four sides of the substantially rectangular frame and / or the lamp holder, and a total of eight locking pieces are provided on the four sides. Is formed.
- four sides of the diffusion plate 2 are provided for each of the above sides. Notches 21 each having a width substantially corresponding to the distance between both sides of the locking piece 3a are provided.
- the optical sheet 1 has the opening 2a, but the diffusion plate 2 has the cutout 21 along the side instead of the opening.
- the frame and the diffusion plate are integrated.
- two notches that can be locked are provided on each edge of the non-effective screen area, but it may be one if there is no effect on the deformation of the optical sheets 1 and the diffusion plate 2. .
- the inner edges of the upper ends of the cutouts on both the left and right sides are in contact with the locking pieces to support the optical member.
- it locks on both left and right sides.
- the weight of the optical sheets 1 and the diffuser plate 2 is increased by their own weight from the locking position. Deflection may occur. Therefore, the width in the direction along the side of the notch is made longer, and locking pieces are provided at both ends. This makes it possible to minimize the bending on the upper side.
- FIG. 10 to FIG. 11 (B) are diagrams showing a configuration example of a liquid crystal backlight device according to a second embodiment of the present invention.
- the size of the LCD increases, the size of the optical sheets 1 or the diffusion plate 2 and the like also increases, and the weight also increases.
- the optical sheets 1 and the diffuser 2 are plastic materials, their mechanical strength is limited. Openings formed in these members may be deformed by stress due to their own weight.
- the inventor increases the area where the opening 2a formed in the optical sheet 1 or the diffusion plate 2 and the locking piece 3a that locks in the opening 2a are in contact with. That is, the contact portion between the opening 2a and the locking piece 3a is elongated in the direction along the side (horizontal direction). It shall be.
- the diffusion plate 2 since the diffusion plate 2 is locked by the locking piece located at the upper end of the shield 3, the opening of the diffusion plate 2 At the upper end, a stress corresponding to gravity is applied due to the weight of the diffusion plate 2.
- the opening 2a located at the upper end and the locking piece 3a can be longer in the direction perpendicular to the direction of weight due to its own weight (the direction along the side).
- the contact area with the stop piece 3a can be increased.
- the stress due to its own weight applied to the upper end of the inner edge of the opening 2a can be dispersed by the wide contact surface, and the stress caused by the optical sheets 1 or the diffusion plate 2 This can reduce the deformation that occurs.
- the liquid crystal display device liquid crystal backlight device
- the opening 2 which has been located on the lower side of the display surface until now. Since a stress is applied to the lower end edge of a due to its own weight, it is preferable that the locking piece at the lower end is configured to have a large contact area when rotated.
- the holes located on the left and right edges with respect to the normal direction (basic position) are rotated within the display surface of the liquid crystal display device, so that they can be tilted 90 ° to the basic position. If the opening 2a and the locking piece 3a are extended vertically (with respect to the left and right sides) at the basic position, the locking piece 3 is located vertically. By increasing the contact area between a and the opening 2a, the stress applied to the diffusion plate 2 or the optical sheets 1 can be dispersed.
- the size of the diffusion plate 2 changes depending on the state of water absorption, that is, the surrounding humidity environment.
- the maximum water absorption (saturated water absorption) of the diffusion plate 2 tends to increase with respect to humidity. Further, the saturated water absorption has a positive correlation with the elongation of the diffusion plate 2. Therefore, as a design philosophy, under the maximum humidity condition in the environment where the diffusion plate 2 is placed, the extent of elongation from the dimension under the normal humidity condition is estimated. An example of the calculation will be described below with reference to FIGS. 17 and 18. The effect of humidity on the diffusion plate 2 will be considered with reference to FIGS. 17 and 18.
- FIG. 17 is an example of experimental data showing the relationship between the number of days left in water and the water absorption when the diffusion plate 2 is immersed in water.
- FIG. 18 is a diagram showing the relationship between the saturated water absorption of the diffusion plate and the length increase rate. As shown in Fig. 17, assuming that the maximum temperature of the liquid crystal backlight is 60 ° C, the water absorption of the diffusion plate is found to be 2.1%. As shown in Fig. 18, the length increase rate at a water absorption rate of 2.1% is found to be 0.45%. Therefore, it is expected that the distance between the left and right holes in the diffusion plate 2 will be extended based on the following equation.
- the diffusion plate is flooded.However, considering, for example, the situation where the diffusion plate is continuously used in a high humidity condition, the length increase rate is 0. Estimating a value of about 45% means that the worst case is being considered, which is considered to be sufficient for design. Therefore, the following equation can be introduced.
- the diffusion plate 2 it is necessary to consider the design of the diffusion plate 2 in consideration of two factors, expansion by heat and elongation by moisture absorption. Generally, elongation and thermal expansion of the diffusion plate 2 due to moisture absorption can be considered independently. Therefore, both the elongation due to the temperature change and the elongation due to the humidity change are added, and the added gap may be secured as the gap between the inner edge of the opening and the outer periphery of the locking piece. An example of the calculation method will be described below.
- the same can be estimated for the vertical direction.
- the position of the opening may be designed based on these estimates.
- FIGS. 12 (A) and 12 (B) show an example of the liquid crystal backlight device according to the present embodiment.
- the weight of the diffusion plate 2 does not affect the plastic diffusion plate 2 due to its water absorption or coefficient of thermal expansion, the thermal environment and humidity environment inside the backlight, etc. However, it may warp toward the LCD panel side.
- the convexly warped portion of the diffuser plate 2 comes into local contact with the liquid crystal panel via the optical sheets 1, causing temperature unevenness over the entire surface of the liquid crystal panel.
- the brightness unevenness may occur on the entire liquid crystal panel screen. Therefore, in order to prevent such a diffusion plate from warping toward the liquid crystal panel surface, for example, a U-shaped stopper 8 is used. It is desirable that the stopper 8 be attached at a position where the retaining piece 3a is gripped so as to sandwich the retaining piece 3a in the thickness direction on the inner surface of the U-shape.
- the liquid crystal backlight device according to the present embodiment is obtained by adding an antistatic function to a diffusion plate.
- an antistatic agent is mixed during the production of the diffusion plate (polymerization stage). This makes it possible to store diffuser plates and incorporate modules This has the advantage that the contamination of impurities at the time can be suppressed, thereby preventing the deterioration of the quality of the diffusion plate due to the attached dust and dirt.
- FIG. 13 is a diagram showing a configuration example of a diffusion plate according to the present embodiment.
- Direct backlight units are often used for large displays. This is due to the weight problem in the case of the light guide plate method. In other words, when the size of the edge-light type backlight unit is increased, the thickness of the light guide must be increased accordingly, and the weight of the light guide plate becomes a problem. In the case of a direct-type backlight device, the strength can be maintained by the surrounding structure, so that the thickness is not required even if it is larger than the light guide plate. Therefore, it is possible to design a large size and light weight.
- the corners and sides of the diffusion plate are chamfered.
- the producer can work safely and quickly, and can manufacture the diffuser plate safely and with high quality.
- the light diffusion sheet can be prevented from bending due to the effect of its own weight, the size of a backlight device such as a liquid crystal display device can be increased.
- the influence of the weight on the optical sheets and the diffusion plate can be reduced.
- the bowing phenomenon can be prevented.
- the optical sheet ⁇ stress on the hole due to the weight of the diffusion plate Therefore, the deformation of the diffusion plate or the like due to the stress applied to the opening can be suppressed.
- optical sheets and diffusers so that they do not cause problems even if they expand due to thermal expansion or water absorption, or if they absorb water and become hot. be able to.
- curbing the periphery of the display device with a “U” -shaped or “L” -shaped clasp the warpage of the optical sheets and the diffusion plate to the liquid crystal panel is minimized. This is possible.
- a diffusion plate with an antistatic function it is possible to suppress the phenomenon in which dust particles are attracted to the optical sheet or the diffusion plate by the static electricity. By chamfering the corners and sides of the diffuser, it is possible to improve the reliability and quality of the diffuser by ensuring worker safety.
- the structure in which the opening is formed in the optical member and the engaging piece is formed in the frame (lamp holder) has been described as an example.
- a stop may be formed.
- the light guide plate method (a side light method using a light guide plate and a light source (light) disposed on a side surface thereof) is also applicable to a relatively small lighting device or liquid crystal display device.
- a back light device for a liquid crystal display device when used as a back light device for a liquid crystal display device, for example, when rotating in the plane of a display screen, stopping at a specific rotation angle (for example, in units of 90 degrees)
- a specific rotation angle for example, in units of 90 degrees
- a known rotation mechanism may be provided so as to be able to stop at an arbitrary rotation angle instead of a unit of 90 degrees.
- rotation around the line that includes the display screen and cuts through the screen may be possible as the center axis. At that time, as described in the present embodiment, it is preferable that the optical member is locked above the center of gravity so that the optical member is hardly bent at any position.
- the optical sheet type diffusion plate can be locked, and These optical members can be prevented from bending under their own weight.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN038247275A CN1695027B (zh) | 2002-08-28 | 2003-08-19 | 照明装置和lcd背光装置 |
US10/526,010 US7380972B2 (en) | 2002-08-28 | 2003-08-19 | Lighting system and liquid crystal backlight device |
AU2003254949A AU2003254949A1 (en) | 2002-08-28 | 2003-08-19 | Lighting system and liquid crystal backlight device |
EP03791227A EP1548359A4 (en) | 2002-08-28 | 2003-08-19 | LIGHTING SYSTEM AND LIQUID CRYSTAL BACKLIGHTING DEVICE |
KR1020057003184A KR100658008B1 (ko) | 2002-08-28 | 2003-08-19 | 조명 장치 및 액정 백라이트 장치 |
HK06101506.9A HK1081636A1 (en) | 2002-08-28 | 2006-02-03 | Lighting system and liquid crystal backlight device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-249346 | 2002-08-28 | ||
JP2002249346A JP3717876B2 (ja) | 2002-08-28 | 2002-08-28 | 液晶表示装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004020899A1 true WO2004020899A1 (ja) | 2004-03-11 |
Family
ID=31972570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010458 WO2004020899A1 (ja) | 2002-08-28 | 2003-08-19 | 照明装置及び液晶バックライト装置 |
Country Status (10)
Country | Link |
---|---|
US (1) | US7380972B2 (ja) |
EP (1) | EP1548359A4 (ja) |
JP (1) | JP3717876B2 (ja) |
KR (1) | KR100658008B1 (ja) |
CN (1) | CN1695027B (ja) |
AU (1) | AU2003254949A1 (ja) |
HK (1) | HK1081636A1 (ja) |
MY (1) | MY143254A (ja) |
TW (1) | TWI315801B (ja) |
WO (1) | WO2004020899A1 (ja) |
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CN108351545B (zh) * | 2015-08-31 | 2021-04-06 | 堺显示器制品株式会社 | 显示装置 |
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- 2003-08-19 US US10/526,010 patent/US7380972B2/en not_active Expired - Lifetime
- 2003-08-19 EP EP03791227A patent/EP1548359A4/en not_active Withdrawn
- 2003-08-19 KR KR1020057003184A patent/KR100658008B1/ko active IP Right Grant
- 2003-08-19 WO PCT/JP2003/010458 patent/WO2004020899A1/ja active Application Filing
- 2003-08-19 AU AU2003254949A patent/AU2003254949A1/en not_active Abandoned
- 2003-08-27 MY MYPI20033237A patent/MY143254A/en unknown
- 2003-08-28 TW TW092123742A patent/TWI315801B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
CN1695027A (zh) | 2005-11-09 |
HK1081636A1 (en) | 2006-05-19 |
US20060072343A1 (en) | 2006-04-06 |
KR100658008B1 (ko) | 2006-12-15 |
CN1695027B (zh) | 2012-04-18 |
KR20050050649A (ko) | 2005-05-31 |
TW200426463A (en) | 2004-12-01 |
AU2003254949A1 (en) | 2004-03-19 |
TWI315801B (en) | 2009-10-11 |
EP1548359A1 (en) | 2005-06-29 |
MY143254A (en) | 2011-04-15 |
US7380972B2 (en) | 2008-06-03 |
JP3717876B2 (ja) | 2005-11-16 |
JP2004086046A (ja) | 2004-03-18 |
EP1548359A4 (en) | 2006-01-18 |
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