WO2011062024A1 - 光学部材、照明装置、表示装置、テレビ受信装置、及び光学部材の製造方法 - Google Patents
光学部材、照明装置、表示装置、テレビ受信装置、及び光学部材の製造方法 Download PDFInfo
- Publication number
- WO2011062024A1 WO2011062024A1 PCT/JP2010/068584 JP2010068584W WO2011062024A1 WO 2011062024 A1 WO2011062024 A1 WO 2011062024A1 JP 2010068584 W JP2010068584 W JP 2010068584W WO 2011062024 A1 WO2011062024 A1 WO 2011062024A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pattern
- base material
- optical member
- optical
- identification pattern
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- 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
-
- 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
- F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/66—Transforming electric information into light information
Definitions
- the present invention relates to an optical member, a lighting device, a display device, a television receiver, and an optical member manufacturing method.
- a backlight device is separately required as a lighting device.
- This backlight device is well known to be installed on the back side of the liquid crystal panel (opposite the display surface), and is housed in the chassis as a lamp having an opening on the liquid crystal panel side surface.
- a large number of light sources for example, cold-cathode tubes
- an optical member such as a diffuser plate
- a reflection sheet for reflecting light from the light source to the optical member and the liquid crystal panel side.
- the linear light is converted into planar light by an optical member, thereby making the illumination light uniform.
- an optical member thereby making the illumination light uniform.
- the conversion into the planar light is not sufficiently performed, a striped lamp image is generated along the arrangement of the light sources, and the display quality of the liquid crystal display device is deteriorated.
- the number of light sources to be arranged can be increased to reduce the distance between adjacent light sources, or the diffusion degree of the diffusion plate can be increased. desirable.
- increasing the number of light sources increases the cost of the backlight device and increases the power consumption.
- a backlight device disclosed in Patent Document 1 below is known as a backlight device that maintains luminance uniformity while suppressing power consumption.
- the backlight device described in Patent Document 1 includes a diffusion plate arranged on the light emission side of a plurality of light sources, and the diffusion plate has a total light transmittance (aperture ratio) of 62 to 71%, and A light control dot pattern having a haze value of 90 to 99% is printed.
- the dot diameter is large immediately above the light source, and the dot diameter decreases as the distance from the light source increases. According to such a configuration, the light emitted from the light source is efficiently used to irradiate light having a sufficient luminance value and uniform luminance without increasing the power consumption of the light source. It is supposed to be possible.
- the light control dot pattern is formed with respect to one board surface among a pair of board surfaces in the base material, and the formation surface of the light control dot pattern faces the light source side. It is assembled to the backlight device. However, if the diffusion plate is assembled to the backlight device with the posture where the light control dot pattern formation surface faces away from the light source side, the base material of the diffusion plate is between the light source and the light control dot pattern. Therefore, there arises a problem that the diffusion plate cannot exhibit desired optical performance.
- the present invention has been completed based on the above circumstances, and aims to identify the front and back of a base material at low cost.
- the optical member of the present invention includes a base material having translucency, an optical pattern formed on the base material and imparting an optical action to light, and the base material in a first posture and the base material. Can be distinguished from the first posture when the second posture is reversed from the first posture, and is formed on the optical pattern forming surface of the substrate and is made of the same material as the optical pattern. And an identification pattern.
- this identification pattern is formed on the optical pattern forming surface of the substrate and is made of the same material as the optical pattern, the identification pattern is also formed in the process of forming the optical pattern when manufacturing the optical member. It is possible to form. Therefore, it is not necessary to add a special process or apparatus for forming the identification pattern, and the identification pattern can be formed at a low cost.
- the identification pattern includes a first line passing through the center of the base material and parallel to a side of the base material, and a second line passing through the center of the base material and orthogonal to the first line. It is formed so as to be non-axisymmetric with respect to at least one of the lines. In this case, when the base material is in the first posture, and the second posture in which the front and back are reversed from the first posture around at least one of the first line and the second line, Can be identified.
- the identification pattern is formed so as to be axisymmetric with respect to the first line and the second line. In this way, it is possible to distinguish between the case where the base material is in the first posture and the case where the second posture is reversed from the first posture around the first line. It is possible to distinguish between the case of the first posture and the case of the second posture inverted from the first posture around the second line.
- the identification pattern is either one of a pair of end portions sandwiching the central portion of the base material. It is formed in the part. In this way, when the base material is in the first posture, the front and back are reversed around a line that passes through the center of the base material from the first posture and is orthogonal to the alignment direction of the central portion and one end portion. In the case of the second posture, the arrangement of the identification pattern is reversed across the central portion, so that the posture of the base material can be more easily identified.
- the identification pattern is formed at one of the pair of end portions sandwiching the central portion of the base material. It consists of the formed 1st identification pattern and the 2nd identification pattern formed in the other edge part. If it does in this way, visibility can be improved further by forming an identification pattern in the both ends of a substrate.
- the first identification pattern and the second identification pattern are non-linear with respect to a line that passes through a center of the base material and is orthogonal to an arrangement direction of the central portion, the one end portion, and the other end portion. It is formed to be symmetrical. If it does in this way, when the substrate is in the first posture, it passes through the center of the substrate from the first posture and is orthogonal to the alignment direction of the central portion, one end portion, and the other end portion. In the case where the second posture is reversed around the line, the arrangement of the first identification pattern and the second identification pattern is reversed and the respective shapes change, so the first posture and the second posture The identification work can be performed more easily.
- the optical pattern is formed so as to be line symmetric with respect to a line passing through the center of the base material and perpendicular to the arrangement direction of the central portion and the pair of end portions.
- the front and back are reversed around a line that passes through the center of the base material from the first posture and is orthogonal to the alignment direction of the center portion and the pair of end portions.
- the second posture although there is no change in the optical pattern, it is possible to discriminate by visually observing the identification pattern in which the change occurs.
- the identification pattern has a linear portion extending along the side of the base material. In this way, compared to the case where the identification pattern is formed in a dot shape, the identification pattern can be easily seen by the linear portion extending along the side of the base material, so that the workability related to identification is improved. In addition, when manufacturing the optical member, an identification pattern having a linear portion on the substrate can be easily formed.
- the said linear part is made into the form which crosses from the one edge in the said base material to the other edge of the other side. This makes it easier to visually recognize the identification pattern, so that the work related to identification can be further improved.
- the linear portion is configured to be continuous over the entire length. This makes it easier to visually recognize the identification pattern, so that the workability related to identification can be further improved.
- the linear portion includes a plurality of line segments arranged intermittently. In this way, the identification pattern can be formed at a low cost because less material is required to form the identification pattern as compared with the case where the linear portion is continuous over the entire length. .
- the base material has a horizontally long rectangular shape, and the linear portion extends along a long side direction of the base material. If it does in this way, it will become easier to visually recognize an identification pattern with the linear part of the form extended along the long-side direction in a substrate, and workability concerning identification can be improved further.
- the identification pattern has a branch portion protruding from the linear portion to the side. In this way, since the identification pattern has a branch-shaped portion that protrudes laterally from the linear portion in addition to the linear portion, the identification pattern is more easily recognized during identification, and further improves workability. be able to.
- the branch portions are arranged in parallel at equal intervals. In this way, the identification pattern can be more easily visually recognized by forming the plurality of branch portions at equal intervals. Moreover, when manufacturing the said optical member, the identification pattern which has a some branch-shaped part in a base material can be formed easily.
- the plurality of branch portions have the same shape. In this way, an identification pattern having a plurality of branch portions can be easily formed.
- the branch portion protrudes from the straight portion to one side. In this way, the installation space for the identification pattern on the base material is small as compared with a case where the branch-shaped portion protrudes from the linear portion to both sides.
- the optical pattern is disposed on the center side of the base material
- the identification pattern is disposed on the end side of the base material
- the branch portion is located on the end side from the linear portion. It is set as the form which protrudes toward. In this way, as compared with the case where the branch-shaped portion protrudes from the linear portion toward the center side, that is, the optical pattern side, the branching is performed on the light to which the optical action is given by the optical pattern. It is possible to reduce the possibility of the optical portion having an optical influence, so that the optical performance of the optical member can be satisfactorily exhibited.
- the branch portion is formed so as to be axisymmetric with respect to a line passing through the center and orthogonal to the linear portion. In this way, the shape of the branch-shaped portion changes between the case where the base material is in the first posture and the case where the second posture is reversed from the first posture. It can be done easily.
- the branch portion has a slanted line shape inclined with respect to the linear portion. In this way, it becomes easier to visually recognize the identification pattern by the branch-shaped portion that is inclined with respect to the linear portion.
- the branch portion is composed of a plurality of line segments arranged intermittently. In this way, compared to the case where the branch portions are continuously formed over the entire length, less material is required to form the identification pattern, so that the identification pattern can be formed at low cost. .
- the branch portion has a triangular shape having a first side along the linear portion and a second side and a third side intersecting the linear portion, and the second side And the third side have different lengths.
- the posture of the base material is determined by the positional relationship between the second side and the third side. Can be identified.
- the branch portion has a right triangle shape in which the second side is a side perpendicular to the linear portion and the third side is an oblique side inclined with respect to the linear portion. . In this way, the second side and the third side can be easily distinguished from each other, so that the workability of the identification work can be further improved.
- the branch portion has an L shape including a portion orthogonal to the linear portion and a portion parallel to the linear portion. In this way, it becomes easier to visually recognize the identification pattern by the L-shaped branch-shaped portion including the portion orthogonal to the linear portion and the portion parallel to the linear portion.
- the optical pattern and the identification pattern are made of a material having light reflectivity. If it does in this way, the light reflectance of the formation surface of the optical pattern in a base material can be controlled by the pattern design of an optical pattern.
- the optical pattern is composed of a large number of dots that are substantially dotted on the surface of the substrate on which the optical pattern is formed. If it does in this way, it will become possible to control easily the light reflectance of the formation surface of the optical pattern in a base material by the mode (area, distribution density, etc.) of a dot.
- the optical pattern and the identification pattern are white. In this way, good light reflectivity can be obtained. Moreover, it becomes easy to visually recognize the identification pattern.
- an illumination device includes the above-described optical member and an opening that opens toward the light emitting side, and the optical member is disposed so as to cover the opening. And a light source accommodated in the chassis and capable of irradiating the optical member with light.
- the manufacturing cost can be reduced.
- the following configuration is preferable.
- the portion of the chassis facing the optical member is divided into a light source arrangement area where the light source is arranged and a light source non-arrangement area where the light source is not arranged
- the optical member is
- the optical pattern is made of a light-reflective material, and the portion that overlaps the light source placement region is larger than the portion that overlaps the light source non-placement region with respect to the light reflectivity provided by the optical pattern.
- the light emitted from the light source first reaches a portion of the optical member that has a relatively high light reflectivity provided by the optical pattern, so that most of the light is reflected by the optical pattern (that is, In other words, the luminance of the illumination light is suppressed with respect to the amount of light emitted from the light source.
- the light reflected here may be reflected in the chassis and reach the light source non-arrangement region.
- the portion of the optical member that overlaps with the light source non-arrangement region has a relatively low light reflectance provided by the optical pattern, and therefore more light is transmitted, thereby obtaining a predetermined illumination light luminance. be able to.
- the optical member overlaps with the entire area of the light source arrangement area and most of the light source non-arrangement area adjacent to the light source arrangement area, and the effective light emission area in which emitted light is effectively used,
- the optical pattern is formed in the effective light emitting region, while the identification pattern is formed in the ineffective light emitting region. ing.
- the optical pattern is formed in the effective light emitting region of the optical member, desired output light can be obtained by applying an optical action to the light from the light source by the optical pattern.
- the identification pattern is arranged in the ineffective light emitting region of the optical member, it is possible to prevent the identification pattern from optically affecting the emitted light in the effective light emitting region, thereby ensuring good emitted light.
- the optical member is configured such that the light reflectance provided by the optical pattern decreases in a direction away from the light source. In this way, the luminance of the illumination light can be made uniform between the light source arrangement region and the light source non-arrangement region.
- At least a portion facing the optical member has a first end, a second end located at an end opposite to the first end, and the first end. It is divided into a central portion sandwiched between the second end portions, of which the central portion is the light source placement region, and the first end portion and the second end portion are the light source non-placement regions.
- a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
- the manufacturing cost can be similarly reduced.
- the following configuration is preferable.
- the display panel is divided into a central display area for displaying an image and a non-display area closer to the end than the display area, and the optical member has the optical pattern as the display area.
- the identification pattern is formed on the overlapping portion, the identification pattern is formed on the non-display region.
- the identification pattern can be prevented from optically affecting the light supplied to the display area of the display panel, high display quality can be ensured.
- the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates. In this way, it can be applied to, for example, a display of a television or a personal computer, and is particularly suitable for a large screen.
- a method for producing an optical member of the present invention includes a base material having translucency, an optical pattern formed on the base material and imparting an optical action to light, and the base
- An optical member manufacturing method comprising: an identification pattern capable of distinguishing between a case where a material is in a first posture and a case where the base material is in a second posture reversed from the first posture.
- the optical pattern and the identification pattern can be formed with the same material on the same surface of the base material obtained through the extrusion molding step. Therefore, it is not necessary to add a special process or apparatus for forming the identification pattern, and the identification pattern can be formed at a low cost. Further, by visually observing the identification pattern, it is possible to distinguish between the case where the manufactured base material is in the first posture and the case where the manufactured base material is in the second posture reversed from the first posture.
- the identification pattern includes a linear portion extending along the side of the base material, and the base material is conveyed along the extending direction of the linear portion. .
- the identification pattern is formed on the substrate to be conveyed.
- the extending direction of the linear portion of the identification pattern coincides with the conveyance direction of the substrate. Therefore, the identification pattern can be easily formed.
- the front and back of a substrate can be identified at a low cost.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device.
- the top view which shows arrangement
- Plan view showing optical pattern and identification pattern in diffusion plate Main part enlarged plan view showing optical pattern in diffusion plate Graph showing the change in light reflectance in the short side direction of the diffuser A graph showing the change in light reflectance in the long side direction of the diffuser Side view showing the outline of the diffusion plate manufacturing equipment
- the top view which shows the state which made the diffuser plate the non-normal posture which reversed the front and back around the 1st line along a X-axis direction from a normal posture
- the top view which shows the state which made the diffuser plate the non-normal posture which reversed the front and back around the 2nd line along a Y-axis direction from a normal posture
- the top view showing the identification pattern in the diffusion plate which concerns on the modification 1 of Embodiment 1.
- the top view showing the identification pattern in the diffusion plate which concerns on Embodiment 2 of this invention The top view showing the identification pattern in the diffusion plate which concerns on the modification 1 of Embodiment 2.
- FIG. 3 The top view showing the identification pattern in the diffusion plate which concerns on the modification 3 of Embodiment 2.
- FIG. The top view showing the identification pattern in the diffusion plate which concerns on the modification 4 of Embodiment 2.
- the top view showing the identification pattern in the diffusion plate which concerns on Embodiment 3 of this invention The top view showing the identification pattern in the diffusion plate which concerns on the modification 1 of Embodiment 3.
- the top view which shows the arrangement configuration of LED in the chassis which concerns on Embodiment 5 of this invention.
- Xxxi-xxxi sectional view of FIG. The graph which shows the change of the light reflectivity in the short side direction of the diffusion plate which concerns on other embodiment (1) of this invention.
- FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver of the present embodiment
- FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 1
- FIG. 3 is a liquid crystal display of FIG. 4 is a cross-sectional view showing a cross-sectional configuration along the short side direction of the device
- FIG. 4 is a cross-sectional view showing a cross-sectional configuration along the long side direction of the liquid crystal display device of FIG. 2
- FIG. 5 is a chassis included in the liquid crystal display device of FIG. It is a top view which shows the arrangement configuration of the hot cathode tube and the reflective sheet.
- the long side direction of the chassis is the X-axis direction
- the short side direction is the Y-axis direction.
- the television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S.
- the liquid crystal display device (display device) 10 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole and is accommodated in a vertically placed state.
- the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
- the screen size is 32 inches and the aspect ratio is 16: 9. More specifically, the horizontal dimension of the screen (dimension in the X-axis direction) is, for example, about 698 mm, and the vertical dimension (Y The dimension in the axial direction is, for example, about 392 mm.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described (see FIGS. 2 to 4).
- the liquid crystal panel (display panel) 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the other glass substrate is provided with a color filter, a counter electrode, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement. Yes.
- the central portion of the screen is a display area AA capable of displaying an image
- the outer frame-like (frame-like) end portion surrounding the display area AA is a non-display area NAA.
- NAA a portion of the liquid crystal panel 11 received by the frame 16 (FIG. 3), a portion received by the stepped surface of the holder 19 (FIG. 4), and a portion covered from the front side by the bezel 13 (FIGS. 3 and 4) are included.
- polarizing plates 11a and 11b are disposed outside both substrates (see FIGS. 3 and 4).
- the backlight device 12 includes a chassis 14 having a substantially box shape having an opening 14 e that opens toward the front side (light emission side, liquid crystal panel 11 side), and an opening 14 e of the chassis 14.
- Optical member 15 group diffusing plate (light diffusing member) 30 and a plurality of optical sheets 31 arranged between the diffusing plate 30 and the liquid crystal panel 11) arranged so as to cover the long side of the chassis 14.
- a frame 16 that is disposed along the long side edge portion of the optical member 15 group and is held between the chassis 14 and the frame 16.
- a hot cathode tube 17 that is a light source (linear light source)
- a socket 18 that relays electrical connection at an end portion of the hot cathode tube 17, an end portion and a socket of the hot cathode tube 17.
- a holder 19 that collectively covers 18.
- a reflection sheet 20 that reflects light is laid in the chassis 14.
- the chassis 14 is made of synthetic resin, and as shown in FIGS. 3 and 4, the bottom plate 14a, the side plate 14b rising from the end of each side of the bottom plate 14a, and the rising end of the side plate 14b outward. It is comprised from the overhang
- the bottom plate 14a has a rectangular shape (longitudinal shape) in which the long side direction and the short side direction coincide with the liquid crystal panel 11 and the optical member 15, and the size in plan view is substantially the same as that of the liquid crystal panel 11 and the optical member 15. The formation range is the same. Further, insertion holes for inserting the socket 18 are formed at both ends of the bottom plate 14a in the long side direction.
- a pair of side plates 14b is provided at each of both ends on the long side and both ends on the short side of the bottom plate 14a, and the rising angle from the bottom plate 14a is substantially a right angle.
- the receiving plate 14c is formed for each side plate 14b and has a bending angle with respect to the side plate 14b substantially at right angles, and is parallel to the bottom plate 14a.
- the outer end portions of the reflection sheet 20 and the optical member 15 are placed, and these can be received from the back side.
- a fixing hole 14d is formed in the receiving plate 14c, and the bezel 13, the frame 16, the chassis 14 and the like can be integrated by screws, for example. .
- the reflection sheet 20 is made of synthetic resin (for example, made of foamed PET), and the surface thereof is white with excellent light reflectivity. As shown in FIG. 2, as shown in FIG. And is arranged so as to cover almost the whole area. With this reflection sheet 20, it is possible to reflect the light emitted from the hot cathode tube 17 toward the optical member 15.
- the reflection sheet 20 has a rectangular shape (longitudinal shape) in which the long side direction and the short side direction coincide with the chassis 14 as a whole, and is symmetrical with respect to the short side direction.
- the reflection sheet 20 includes a bottom portion 20a disposed along the bottom plate 14a of the chassis 14, a pair of rising portions 20b rising from the end portion of the bottom portion 20a to the front side (light emitting side, optical member 15 side), and each rising portion 20b. And a pair of extending portions 20c extending outward from the leading end portion (the end portion opposite to the bottom 20a side).
- the bottom 20a is arranged on the center side in the short side direction of the bottom plate 14a of the chassis 14 (position overlapping with the center portion 14C) when viewed in plan, and is parallel to the plate surface of the bottom plate 14a.
- a pair of rising portions 20b are arranged at positions sandwiching the bottom portion 20a in the short side direction, and both ends of the bottom plate 14a of the chassis 14 in the short side direction (positions overlapping with both end portions 14A and 14B) when viewed in plan. It is arranged in.
- the rising portion 20b has an inclined shape having a certain gradient from the rising base end portion (end portion on the bottom portion 20a side) to the rising tip portion (end portion on the side opposite to the bottom portion 20a side (extension portion 20c side)).
- the extending portion 20c extends outward from the leading end portion of each rising portion 20b, and is arranged so as to overlap with each receiving plate 14c in the chassis 14 when seen in a plan view.
- the extending portion 20 c is sandwiched between the receiving plate 14 c and the outer edge portion of the diffusion plate 30.
- the optical member 15 has a horizontally long rectangular shape (rectangular shape) in a plan view, like the liquid crystal panel 11 and the chassis 14.
- the optical member 15 is interposed between the liquid crystal panel 11 and the hot cathode tube 17, and has a diffusion plate 30 disposed on the back side (the hot cathode tube 17 side, opposite to the light emitting side), and the front side (liquid crystal). And an optical sheet 31 disposed on the panel 11 side and the light emitting side.
- the diffusing plate 30 has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material 30a having a predetermined thickness, and has a function of diffusing transmitted light.
- the optical sheet 31 has a sheet shape that is thinner than the diffusion plate 30, and three optical sheets 31 are laminated. Specifically, the optical sheet 31 is a diffusion sheet, a lens sheet, and a reflective polarizing sheet in order from the diffusion plate 30 side (back side).
- the central portion that overlaps the display area AA of the liquid crystal panel 11 described above is effective in displaying the light on the liquid crystal panel 11 as shown in FIGS. While the effective light emitting area EA is used, the outer frame-shaped (frame-like) end portion that overlaps the non-display area NAA in the liquid crystal display device 11 and surrounds the effective light emitting area EA is the non-effective light emitting area NEA. It is said. In FIG. 6, only the short side direction (Y-axis direction) is illustrated with respect to the effective light emission area EA and the non-effective light emission area NEA, and the boundary line between both areas EA and NEA is indicated by a one-dot chain line.
- the hot cathode tube 17 is tubular (linear) as a whole, and includes a hollow glass tube 17a and a pair of electrodes 17b arranged at both ends of the glass tube 17a.
- the glass tube 17a is filled with mercury, a rare gas and the like, and a fluorescent material is applied to the inner wall surface thereof.
- the light emitting surface of the hot cathode tube 17 is the outer peripheral surface of the glass tube 17a, and can emit light radially from the axis.
- Each electrode 17b includes a filament and a pair of terminals connected to both ends of the filament.
- Sockets 18 are fitted on both ends of the hot cathode tube 17, and the terminals are connected to the inverter board 22 attached to the outer surface side (back surface side) of the bottom plate 14 a of the chassis 14 via the socket 18.
- the hot cathode tube 17 is supplied with driving power from the inverter board 22 and can control the tube current value, that is, the luminance (lighting state) by the inverter board 22.
- the hot cathode tube 17 is interposed between the diffusion plate 30 and the bottom plate 14 a (reflection sheet 20) of the chassis 14, and is disposed closer to the bottom plate 14 a of the chassis 14 than the diffusion plate 30.
- the outer diameter of the hot cathode tube 17 is larger than the outer diameter of the cold cathode tube (for example, about 4 mm), for example, about 15.5 mm.
- only one hot cathode tube 17 having the above-described structure is accommodated in the chassis 14 with its length direction (axial direction) coinciding with the long side direction of the chassis 14.
- the position is approximately the center of the chassis 14 in the short side direction.
- a portion of the chassis 14 that faces the diffusion plate 30 of the optical member 15, that is, the entire area of the bottom plate 14 a and a part (base end portion) of the receiving plate 14 c are arranged in the short side direction (Y-axis direction).
- the hot cathode tube 17 When divided into a first end portion 14A, a second end portion 14B located at the end opposite to the first end portion 14A, and a central portion 14C sandwiched between them, the hot cathode tube 17 has a central portion. 14C, and a light source arrangement area LA is formed here. On the other hand, the hot cathode tube 17 is not disposed at the first end portion 14A and the second end portion 14B of the chassis 14, and a light source non-arrangement region LN is formed here.
- the hot cathode tube 17 forms the light source arrangement area LA in a form unevenly distributed at the center portion 14C in the short side direction of the bottom plate 14a of the chassis 14, and the area of the light source arrangement area LA (the length in the Y-axis direction).
- the dimension is smaller than the area of the light source non-arrangement region LN (the length dimension in the Y-axis direction).
- the ratio of the area (the length dimension in the Y-axis direction) of the light source arrangement region LA to the area of the entire screen (the vertical dimension (short side dimension) of the screen) is, for example, about 4%.
- the pair of light source non-arrangement regions LN have substantially the same area.
- each light source non-arrangement area LN adjacent to the light source arrangement area LA overlaps with the effective light emission area EA in the diffuser plate 30, whereas A part (outer part) on the end side in FIG. 9 overlaps with the ineffective light emitting area NEA in the diffusion plate 30.
- the holder 19 that covers the end portion of the hot cathode tube 17 and the socket 18 is made of a synthetic resin that exhibits white color, and as illustrated in FIG. 2, has a long and narrow box shape that extends along the short side direction of the chassis 14. .
- the holder 19 has a stepped surface on the surface side where the optical member 15 or the liquid crystal panel 11 can be placed in steps, and a part of the receiving plate 14 c in the short side direction of the chassis 14. They are arranged in a superposed state, and form the side wall of the backlight device 12 together with the receiving plate 14c.
- An insertion pin 23 protrudes from a surface of the holder 19 facing the receiving plate 14c of the chassis 14, and the insertion pin 23 is inserted into an insertion hole 24 formed on the upper surface of the receiving plate 14c of the chassis 14.
- the holder 19 is attached to the chassis 14.
- FIG. 6 is a plan view for explaining an optical pattern and an identification pattern in the diffusion plate
- FIG. 7 is an enlarged plan view of a main part showing the optical pattern in the diffusion plate in FIG. 6
- FIG. 8 is a short side direction of the diffusion plate in FIG.
- FIG. 9 is a graph showing a change in light reflectance in the long side direction of the diffusion plate in FIG. 8 and 9, the long side direction of the diffusion plate is the X-axis direction, and the short side direction is the Y-axis direction.
- the horizontal axis indicates the Y-axis direction (short side direction), and from the front side end portion to the back side end portion shown in FIG.
- the horizontal axis indicates the X-axis direction (long-side direction), and a graph plotting the light reflectance from the left end to the right end shown in FIG. 6 along the Y-axis direction. It has become.
- the diffusing plate 30 is made of a substantially transparent synthetic resin (for example, made of polystyrene) and has a rectangular plate shape that is horizontally long when viewed in a plane.
- the light transmittance and light reflectance are substantially uniform throughout.
- the specific light transmittance and light reflectance of the base material 32 of the diffusion plate 30 (excluding the optical pattern 33 and the identification pattern 34 described later) are, for example, about 70% light transmittance and light reflection.
- the rate is preferably about 30%.
- the diffusion plate 30 (base material 32) is located on the opposite side of the first surface 30a from the back surface (hereinafter referred to as the first surface 30a) facing the hot cathode tube 17, and is opposed to the liquid crystal panel 11.
- the first surface 30 a is a light incident surface on which light from the hot cathode tube 17 is incident, whereas the second surface 30 b emits light (illumination light) toward the liquid crystal panel 11.
- the light exit surface is a front side surface.
- An optical pattern 33 made of a material having light reflectivity is formed on the first surface 30a constituting the light incident surface of the diffusion plate 30 (base material 32), as shown in FIGS. ing.
- the optical pattern 33 is selectively formed in the effective light emitting area EA (center portion) of the diffusion plate 30 and reflects the light from the hot cathode tube 17 to the back side before entering the substrate 32. It is possible.
- the optical pattern 33 is formed, for example, by printing a paste containing a metal oxide on the surface of the substrate 32, and the surface is white. As the printing means, screen printing, ink jet printing and the like are suitable.
- the optical pattern 33 is composed of a large number of dots 33 a arranged on the surface of the base material 32 with a predetermined distribution density (array interval).
- the dots 33a have a round shape in plan view and are arranged in a zigzag shape (staggered shape, staggered shape) on the surface of the substrate 32 (FIG. 7).
- the dots 33a forming the optical pattern 33 have a light reflectance that is greater than that of the light reflectance of about 75%, for example, and the light reflectance within the surface of the diffusion plate 30 itself is about 30%. It is supposed to have a rate.
- the light reflectance of each material is the average light reflectance within the measurement diameter measured by LAV (measurement diameter ⁇ 25.4 mm) of CM-3700d manufactured by Konica Minolta.
- the optical reflectance of the optical pattern 33 itself is a value obtained by forming the optical pattern 33 over the entire surface of the glass substrate and measuring the formation surface based on the measuring means.
- the diffuser plate 30 has a long side direction (X-axis direction) and a short side direction (Y-axis direction).
- the diffuser plate As shown in FIG. 8, the light reflectance of the first surface 30a facing the hot cathode tube 17 in the effective light emitting area EA at 30 changes along the short side direction (see FIG. 6). That is, as shown in FIG. 6, the diffuser plate 30 has a light reflectance of a portion (hereinafter referred to as a light source overlapping portion DA) overlapping with the hot cathode tube 17 on the first surface 30a of the effective light emitting area EA as a whole.
- a light source overlapping portion DA a portion overlapping portion
- the optical pattern 33 is formed so as to be larger than the light reflectance of a portion that does not overlap with the hot cathode tube 17 (hereinafter referred to as a light source non-overlapping portion DN). Note that the light reflectance of the first surface 30a in the effective light emitting area EA of the diffusion plate 30 hardly changes along the long side direction as shown in FIG. 9, and is substantially constant (FIG. 6). reference).
- the light reflectance in the effective light emission area EA of the diffusion plate 30 is continuously small toward the direction away from the hot cathode tube 17 along the short side direction (Y-axis direction). It continuously increases in the direction approaching the hot cathode tube 17, and its distribution is set to take a normal distribution (a hanging curve). Specifically, the light reflectance in the effective light emitting area EA of the diffuser plate 30 is maximized at the center position in the short side direction (position matching the center of the hot cathode tube 17), and at both end positions in the short side direction. The minimum.
- the maximum value of the light reflectance is, for example, about 65%, and the minimum value is, for example, about 30%, which is equivalent to the light reflectance of the diffusion plate 30 itself. Accordingly, it can be said that the optical pattern 33 is arranged only slightly or hardly at both end positions in the short side direction in the effective light emitting area EA of the diffusion plate 30.
- the optical pattern 33 passes through the center of the diffuser plate 30 and passes through the first line L1 parallel to the long side direction (X-axis direction) and the center of the diffuser plate 30, and is orthogonal to the first line L1 (short side).
- the second line L2 (parallel to the Y-axis direction which is the direction) is patterned so as to be line symmetric. In FIG. 6, the first line L1 and the second line L2 are indicated by two-dot chain lines.
- the optical pattern 33 is formed as follows. That is, the area of each dot 33a constituting the optical pattern 33 is maximized at a position corresponding to the center position in the short side direction in the effective light emitting area EA of the diffuser plate 30, that is, the center position of the hot cathode tube 17, and moves away from it. The size gradually decreases toward the direction, and the one disposed closest to the end in the short side direction in the effective light emitting area EA of the diffusion plate 30 is minimized. That is, the area of each dot 33a is set to be smaller as the distance from the center of the hot cathode tube 17 is larger.
- the diffusing plate 30 having such a configuration, the luminance distribution of illumination light can be made smoother over the entire effective light emitting area EA of the diffusing plate 30, and as a result, a gentle illumination luminance distribution can be realized as the whole backlight device 12. It becomes possible to do.
- a large number of dots 33a forming the optical pattern 33 are arranged in line symmetry with respect to the first line L1 and the second line L2. Note that, as other means for adjusting the light reflectance, for example, the area of each dot 33a of the optical pattern 33 may be the same, and the interval between the dots 33a may be changed.
- the diffusion plate 30 described above is optically designed on the assumption that the optical pattern 33 is used in a posture (hereinafter referred to as a normal posture) facing the back side, that is, the hot cathode tube 17 side. Then, the light from the hot cathode tube 17 hits the optical pattern 33 and is reflected before entering the base material 32 containing the diffusing particles.
- a posture reversed from the normal posture hereinafter referred to as a non-regular posture
- the light from the hot cathode tube 17 passes through the base material 32 containing the diffusing particles.
- the diffusing plate 30 is surely in a normal posture and not in an irregular posture by mistake.
- the identification pattern 34 made of the same material as the optical pattern 33 is formed on the first surface that is the formation surface of the optical pattern 33 on the substrate 32. 30a is formed. Similar to the optical pattern 33, the identification pattern 34 is formed by, for example, printing a paste containing a metal oxide on the surface of the substrate 32, and the surface is white. Therefore, when forming the identification pattern 34 on the base material 32, the same manufacturing apparatus (printing apparatus described later) is used in the process of forming the optical pattern 33 which is an existing process among the manufacturing processes of the diffusion plate 30. Therefore, it is possible to cope with the manufacturing cost without changing the manufacturing apparatus and without increasing the tact time.
- the arrangement and configuration of the identification pattern 34 will be described in detail.
- the identification pattern 34 is selectively formed in the substrate 32 in a region where the optical pattern 32 is formed, that is, a region outside the effective light emitting region EA, that is, a non-effective light emitting region NEA. This prevents the identification pattern 34 made of a light-reflective material from affecting the light traveling toward the effective light emitting area EA.
- the identification pattern 34 is formed only at one end portion of the pair of end portions (non-effective light emitting area NEA) sandwiching the central portion that is the effective light emitting area EA of the base material 32 in the short side direction (Y-axis direction). It is not formed at the other end.
- the identification pattern 34 is formed at the lower end portion shown in FIG. 6, and the identification pattern 34 is not formed at the upper end portion of the same figure. . From this, it can be said that the identification pattern 34 is formed so as to be non-axisymmetric with respect to the first line L1 passing through the center of the diffusion plate 30 and parallel to the long side direction (X-axis direction). Therefore, when the diffusion plate 30 is reversed from the normal posture to the non-normal posture around the first line L1 (FIG. 11), the identification pattern 34 is on the side opposite to the normal posture (the upper side shown in FIG. 11). ). Thereby, it is possible to easily identify the case where the diffusion plate 30 is in the normal posture and the case where the diffusion plate 30 is in the non-normal posture inverted from the normal posture around the first line L1.
- the identification pattern 34 includes a linear portion 35 extending along the long side direction (X-axis direction) of the substrate 32 and a branch-like portion protruding laterally from the linear portion 35 along a direction intersecting the extending direction. 36.
- the linear portion 35 is configured to cross the base material 32 over the entire length in the long side direction.
- the linear portion 35 is continuous over the entire length from one end edge in the long side direction of the base material 32 to the other end edge on the opposite side, and is continuous in the middle.
- the branch part 36 does not protrude from the straight part 35 to both sides, and is configured to protrude only to one side. Specifically, the branch portion 36 protrudes from the linear portion 35 toward the end side in the short side direction of the substrate 30, that is, the side opposite to the optical pattern 33 (effective light emitting area EA) side. Therefore, it is reliably avoided that the branch-like portion 36 protruding from the linear portion 35 affects the light on the effective light emitting area EA side.
- the branch portion 36 is formed in a slanted line shape inclined at a predetermined angle with respect to the extending direction (X-axis direction) of the linear portion 35. Specifically, in the branch-like portion 36, when the diffusion plate 30 is in the normal posture, the right end portion shown in FIG.
- the branch-like portion 36 has a slope that is lower left (upward right) as shown in FIG. 6 when the diffusion plate 30 is in the normal posture.
- the branch portion 36 is composed of two line segments 36 a that are intermittently arranged in the extending direction. Among these, the line segment 36 a on the protruding proximal end side is continuous with the linear portion 35, whereas the branch portion 36 protrudes. The distal end side line segment 36a is spaced apart from the linear portion 35 and the protruding proximal end side line segment 36a. These two line segments 36a have the same length. The interval held between both line segments 36a is also the same as the length dimension of the line segment 36a.
- Four branch portions 36 are arranged in parallel in the X-axis direction, and the interval (arrangement pitch) between the adjacent branch portions 36 is substantially equal to each other. Each branch portion 36 has the same shape so that the inclination angle and the length dimension with respect to the straight portion 35 are all the same.
- Each branch portion 36 is formed so as to be non-axisymmetric with respect to a third line L3 that passes through the center and is orthogonal to the linear portion 35 (along the Y-axis direction). Therefore, when the diffusion plate 30 is reversed from the normal posture to the non-normal posture around the second line L2 parallel to the Y-axis direction (FIG. 12), each branch portion 36 is different from the normal posture. The inclination direction is reversed and the outer shape of the identification pattern 34 is changed. Thereby, it is possible to easily identify the case where the diffusion plate 30 is in the normal posture and the case where the diffusion plate 30 is in the non-normal posture inverted from the normal posture around the second line L2.
- the third line L3 is indicated by a two-dot chain line.
- the manufacturing apparatus 40 used for manufacturing the diffusion plate 30 has an extruder 41 for extruding the base material M of the base material 32 and the extruded base material M so as to have a uniform thickness.
- a plurality of rollers 42 (three in FIG. 10) to be conveyed, a heater 43 for heating the base material M sandwiched between the rollers 42, and a base material M formed by the extruder 41 and the rollers 42
- the transport roller 44, the pattern printing device 45 for inkjet printing the optical pattern 33 and the identification pattern 34 on the base material M, and the base material M on which the optical pattern 33 and the identification pattern 34 are patterned are cut into predetermined lengths.
- a cutter 46 The conveying direction of the base material M (base material 32) in the manufacturing apparatus 40 coincides with the X-axis direction, that is, the long side direction of the diffusion plate 30.
- each of the devices 41 to 46 constituting the manufacturing device 40 has a depth dimension adapted to the short side dimension of the diffusion plate 30 although illustration is omitted.
- the diffusion plate 30 In manufacturing the diffusion plate 30, first, in the extrusion molding process, a material obtained by heating and kneading the raw material (having thermoplasticity) of the base material 32 is extruded from the extruder 41 and sandwiched between the rollers 42. It is conveyed while forming so that the thickness becomes uniform. At this time, by appropriately heating the base material M with the heater 43, the base material M can be maintained in a softened state (molten state), and the base material M can be formed by the roller 42. The base material M formed into a plate having a uniform thickness is cooled and solidified in the process of being transported by the transport roller 44.
- the optical pattern 33 and the identification pattern 34 are simultaneously inkjet printed by using the same material on the plate surface of the base material M opposite to the transport roller 44 side by the pattern printing device 45.
- the pattern printing device 45 is assumed to be a dedicated device for the optical pattern 33, and the identification pattern 34 is used. Compared with a case where a dedicated device is prepared separately, the cost related to the manufacturing device 40 can be reduced and the tact time related to manufacturing can be shortened.
- the pattern printing apparatus 45 is in the case of inkjet printing.
- the driving of the inkjet head (not shown) can be simplified, and complicated driving is not required. Therefore, it is difficult for the pattern printing device 45 to fail, resulting in a reduction in manufacturing cost.
- the diffusion plate 30 (base material 32) is obtained by cutting the base material M on which the optical pattern 33 and the identification pattern 34 are formed through the above-described pattern formation step by a cutter 46 for each predetermined length. It is done.
- the diffuser plate 30 manufactured in this way is incorporated into the backlight device 12 manufactured by the following procedure.
- the reflection sheet 20 is first laid in the chassis 14, and then the hot cathode tube 17 is accommodated.
- a pair of holders 19 are attached to both ends in the long side direction of the chassis 14, and both ends of the hot cathode tube 17 are covered with the holders 19 (FIGS. 3 and 4).
- an operation of sequentially attaching the diffusion plate 30 and the optical sheet 31 constituting the optical member 15 so as to cover the opening 14e of the chassis 14 is performed.
- the front and back sides are identified so that the diffusion plate 30 assumes a normal posture. That is, if the diffusion plate 30 (base material 32) is in a normal posture, as shown in FIG. 6, the identification pattern 34 is arranged on the lower end of the diffusion plate 30 in the same figure, and each branch portion 36 is provided. Is a slanted line with a slope that goes down to the left (up to the right).
- the diffuser plate 30 is changed from the above-described normal posture to the non-normal posture that is reversed around the first line L1 parallel to the long side direction (X-axis direction), as shown in FIG.
- the identification pattern 34 is the end on the upper side of the diffusing plate 30, that is, the end opposite to the normal posture.
- the top and bottom arrangement will be reversed.
- the diffuser plate 30 is in the non-normal posture reversed from the normal posture around the second line L2 parallel to the short side direction (Y-axis direction), as shown in FIG.
- the left and right arrangements of the identification pattern 34 are reversed while being arranged on the lower side of the figure in the same manner as in the normal posture.
- Reference numeral 36 denotes a downward slope in the figure (upward to the left), that is, an oblique line having a slope opposite to that in the normal posture. Therefore, when “the identification pattern 34 is visually recognized at the end opposite to the normal posture” or “when each branch portion 36 is visually recognized as an oblique line having a gradient opposite to the normal posture” Since it is found that the plate 30 is in an irregular posture in which the normal posture is reversed from the normal posture, the operator can perform the work of attaching the diffusion plate 30 to the chassis 14 after returning the diffusion plate 30 to the normal posture. By visually observing the identification pattern 34 in this manner, it is possible to easily identify whether the diffuser plate 30 is in a normal posture or a non-normal posture reversed from the normal posture. It is possible to prevent the device from being attached to the backlight device 12 in the correct posture. Thereby, the optical performance of the diffusing plate 30 can be exhibited normally, and the emitted light from the backlight device 12 can be ensured to an appropriate one.
- the backlight device 12 After attaching each optical member 15 to the chassis 14, the backlight device 12 is obtained by assembling the frame 16. Subsequently, the liquid crystal display device 10 is obtained by assembling the liquid crystal panel 11 and the bezel 13 to the backlight device 12.
- the hot cathode tube 17 When the hot cathode tube 17 is turned on when using the liquid crystal display device 10, the light emitted from the hot cathode tube 17 is directly directed to the first surface 30 a (the formation surface of the optical pattern 33) of the diffusion plate 30.
- each member holder 19, reflection sheet 20, etc.
- the light reflection function of the diffusion plate 30 will be described in detail.
- the light incident efficiency can be appropriately controlled for each region.
- the direct light from the hot cathode tube 17 is much, and the light amount is relatively larger than that of the light source non-overlapping portion DN. Therefore, by relatively increasing the light reflectance (area of the dots 33a) of the optical pattern 33 in the light source overlapping portion DA (see FIGS.
- the incidence of light on the first surface 30a is suppressed (restriction).
- a large amount of light is reflected back into the chassis 14.
- the direct light from the hot cathode tube 17 is less and the light amount is relatively smaller than that of the light source overlapping portion DA. Therefore, by making the light reflectance (area of the dots 33a) of the optical pattern 33 in the light source non-overlapping portion DN relatively small (see FIGS. 6 and 8), it is possible to promote the incidence of light on the first surface 30a. Can do.
- the light amount is compensated. A sufficient amount of light incident on the overlapping portion DN can be secured.
- the light emitted from the hot cathode tube 17 is converted into substantially uniform planar light having no unevenness in the surface of the diffusion plate 30 by applying the optical action described above in the process of passing through the diffusion plate 30.
- the liquid crystal panel 11 is irradiated with an optical effect after passing through each optical sheet 31.
- luminance unevenness hardly occurs in the light emitted from the backlight device 12, so that the display quality of the liquid crystal display device 10 can be improved.
- the diffusing plate 30 that is the optical member 15 according to the present embodiment includes the base material 32 having translucency, the optical pattern 33 that is formed on the base material 32 and imparts an optical action to the light, and the base. It is possible to distinguish between the case where the material 32 is set to the first posture (normal posture) and the case where the base material 32 is set to the second posture (non-normal posture) reversed from the first posture. And an identification pattern 34 made of the same material as the optical pattern 33 while being formed on the first surface 30a, which is the surface on which the optical pattern 33 is formed on the substrate 32.
- this identification pattern 34 is formed on the first surface 30a which is the formation surface of the optical pattern 33 in the base material 32 and is made of the same material as the optical pattern 33, it is optical when the diffusion plate 30 is manufactured.
- the identification pattern 34 can also be formed in the process of forming the pattern 33. Therefore, it is not necessary to add a special process or apparatus for forming the identification pattern 34, and the identification pattern 34 can be formed at a low cost. According to this embodiment, the front and back of the base material 32 can be identified at low cost.
- the identification pattern 34 passes through the center of the base material 32 and passes through the first line L1 parallel to the side (long side) of the base material 32 and the center of the base material 32 and is orthogonal to the first line L1. It is formed so as to be non-axisymmetric with respect to at least one of the two lines L2. If it does in this way, the case where the base material 32 was made into the 1st attitude
- the identification pattern 34 is formed so as to be axisymmetric with respect to the first line L1 and the second line L2. In this way, it is possible to distinguish between the case where the base material 32 is set to the first posture and the case where the base material 32 is set to the second posture inverted from the first posture around the first line L1. In addition, it is possible to distinguish between the case of the first posture and the case of the second posture inverted from the first posture around the second line L2.
- the optical pattern 33 is formed in the central portion (effective light emission area EA) of the base material 32, whereas the identification pattern 34 is a pair of end portions (ineffective light emission sandwiching the central portion of the base material 32).
- the region NEA) is formed at one end. If it does in this way, when the base material 32 is made into the 1st attitude
- the optical pattern 33 is formed so as to be line symmetric with respect to a line L1 that passes through the center of the base material 32 and is orthogonal to the arrangement direction (Y-axis direction) of the central portion and the pair of end portions. If it does in this way, when the base material 32 is made into the 1st attitude
- the identification pattern 34 has a linear portion 35 extending along the side of the base material 32. In this way, the identification pattern 34 can be easily seen by the linear part 35 extending along the side of the base material 32 as compared with the case where the identification pattern is formed in a dot shape. Workability can be improved, and the identification pattern 34 having the linear portion 35 can be easily formed on the base 32 when the diffusion plate 30 is manufactured.
- the linear part 35 is made into the form which crosses from the one edge in the base material 32 to the other edge of the other side. This makes it easier to visually recognize the identification pattern 34, so that the work related to identification can be further improved.
- linear part 35 is made into the form which continues over a full length. This makes it easier to visually recognize the identification pattern 34, so that the workability related to identification can be further improved.
- the base material 32 has a horizontally long rectangular shape, and the linear portion 35 is configured to extend along the long side direction of the base material 32. If it does in this way, it will become easier to visually recognize the identification pattern 34 by the linear part 35 of the form extended along the long side direction in the base material 32, and the workability
- the identification pattern 34 has a branch portion 36 that protrudes laterally from the straight portion 35. In this way, since the identification pattern 34 has the branch portions 36 projecting laterally from the linear portions 35 in addition to the linear portions 35, the identification patterns 34 are more easily recognized during identification, and workability is improved. Further improvement can be achieved.
- a plurality of branch portions 36 are arranged in parallel at equal intervals. In this way, by forming the plurality of branch portions 36 at equal intervals, the identification pattern 34 can be more easily recognized. Further, when manufacturing the diffusion plate 30, the identification pattern 34 having a plurality of branch portions 36 can be easily formed on the base material 32.
- the plurality of branch portions 36 have the same shape. In this way, the identification pattern 34 having a plurality of branch portions 36 can be easily formed.
- the branch portion 36 is configured to protrude from the straight portion 35 to one side. In this way, the installation space for the identification pattern 34 on the base material 32 is small as compared with a case where the branch-shaped portion protrudes from the linear portion 35 to both sides. This contributes to a narrow frame of the liquid crystal display device 10.
- the optical pattern 33 is disposed on the center side of the base material 32, whereas the identification pattern 34 is disposed on the end side of the base material 32, and the branch portion 36 extends from the straight portion 35 to the end side. It is the form which protrudes toward. In this way, compared to the case where the branch-shaped portion protrudes from the linear portion 35 toward the center side, that is, toward the optical pattern 33 side, the light to which the optical action is imparted by the optical pattern 33 is added. On the other hand, it is possible to reduce the possibility that the branch-like portion 36 has an optical influence, so that the optical performance of the diffusion plate 30 can be exhibited well.
- the branch portion 36 is formed so as to be non-axisymmetric with respect to a line L2 that passes through the center thereof and is orthogonal to the linear portion 35. In this way, the shape of the branch portion 36 changes between when the base material 32 is in the first posture and when it is in the second posture reversed from the first posture. Can be performed more easily.
- the branch portion 36 has an oblique line shape inclined with respect to the straight portion 35. In this way, it becomes easier to visually recognize the identification pattern 34 by the branch-shaped portion 36 that is inclined with respect to the linear portion 35.
- the branch portion 36 is composed of a plurality of line segments 36a arranged intermittently. In this way, compared with the case where the branch portions are continuously formed over the entire length, less material is required to form the identification pattern 34, so that the identification pattern 34 can be formed at a low cost. Can do.
- the optical pattern 33 and the identification pattern 34 are made of a material having light reflectivity. In this way, the light reflectance of the surface of the base material 32 where the optical pattern 33 is formed can be controlled by the pattern design of the optical pattern 33.
- the optical pattern 33 is composed of a large number of dots 33a having a substantially dot shape on the first surface 30a that is the formation surface of the optical pattern 33 in the base material 32. In this way, it is possible to easily control the light reflectance of the surface of the substrate 32 on which the optical pattern 33 is formed, depending on the mode (area, distribution density, etc.) of the dots 33a.
- the optical pattern 33 and the identification pattern 34 are white. In this way, good light reflectivity can be obtained. In addition, the identification pattern 34 is easily visible.
- the backlight device 12 includes the above-described diffusion plate 30 and a chassis in which the diffusion plate 30 is arranged so as to cover the opening 14e as well as the opening 14e opening toward the light emitting side. 14 and a hot cathode tube 17 that is housed in the chassis 14 and is a light source capable of irradiating the diffusion plate 30 with light.
- the diffusion plate 30 that transmits light from the hot cathode tube 17 can identify the front and back of the base material 32 at a low cost, thereby reducing the manufacturing cost. Can do.
- the chassis 14 has a portion facing the diffusion plate 30 divided into a light source arrangement area LA where the hot cathode tubes 17 are arranged and a light source non-arrangement area LN where the hot cathode tubes 17 are not arranged.
- the optical pattern 33 is made of a material having light reflectivity, and the portion (light source overlapping portion DA) that overlaps the light source arrangement region LA with respect to the light reflectance provided by the optical pattern 33 is the light source non-arrangement region. It is formed to be larger than a portion (light source non-overlapping portion DN) overlapping with LN.
- the light emitted from the hot cathode tube 17 first reaches a portion of the diffuser plate 30 where the light reflectance provided by the optical pattern 33 is relatively large (light source overlapping portion DA). Most of the light is reflected by the optical pattern 33 (that is, not transmitted), and the luminance of the illumination light is suppressed with respect to the amount of light emitted from the hot cathode tube 17.
- the light reflected here may be reflected in the chassis 14 and reach the light source non-arrangement region LN.
- a portion of the diffuser plate 30 that overlaps with the light source non-arrangement region LN (light source non-overlapping portion DN) has a relatively low light reflectivity provided by the optical pattern 33, and thus more light is transmitted.
- the brightness of the predetermined illumination light can be obtained.
- the diffuser plate 30 overlaps the entire light source arrangement area LA and most of the light source non-arrangement area LN adjacent to the light source arrangement area LA, and an effective light emission area EA in which emitted light is effectively used, and a light source
- the optical pattern 33 is formed in the effective light-emitting area EA, while the optical pattern 33 is formed in the non-effective light-emitting area NEA.
- the optical pattern 33 is formed in the effective light emitting area EA of the diffuser plate 30, the optical action is imparted to the light from the hot cathode tube 17 by the optical pattern 33, so that a desired output can be obtained. You can get light.
- the identification pattern 34 is arranged in the non-effective light emitting area NEA of the diffuser plate 30, it is possible to prevent the identification pattern 34 from optically affecting the light emitted from the effective light emitting area EA. The emitted light is secured.
- the diffuser plate 30 is configured such that the light reflectance imparted by the optical pattern 33 decreases toward the direction away from the hot cathode tube 17. In this way, the luminance of the illumination light can be made uniform between the light source arrangement area LA and the light source non-arrangement area LN.
- the chassis 14 has at least the first end portion 14A, the second end portion 14B located at the end opposite to the first end portion 14A, and the first end portion 14A at a portion facing the diffusion plate 30. And a central portion 14C sandwiched between the second end portion 14B, of which the central portion 14C is a light source placement region LA, and the first end portion 14A and the second end portion 14B are light source non-placement regions LN. It is said. In this way, sufficient luminance can be secured in the central portion of the backlight device 12, and the luminance of the display central portion can be secured also in the liquid crystal display device 10 including the backlight device 12. Therefore, good visibility can be obtained.
- the liquid crystal display device 10 includes the above-described backlight device 12 and the liquid crystal panel 11 that performs display using light from the backlight device 12. According to the liquid crystal display device 10 as described above, the manufacturing cost of the backlight device 12 that supplies light to the liquid crystal panel 11 can be similarly reduced because the manufacturing cost is reduced. It is also suitable for increasing the screen size.
- the liquid crystal panel 11 is divided into a display area AA on the center side for displaying an image and a non-display area NAA on the end side with respect to the display area AA.
- the diffusion plate 30 has the optical pattern 33 in the display area AA.
- the identification pattern 34 is formed in a portion overlapping the non-display area NAA. In this way, a good display quality can be obtained by applying an optical action to the light supplied to the display area AA of the liquid crystal panel 11 by the optical pattern 33.
- the identification pattern 34 is prevented from optically affecting the light supplied to the display area AA of the liquid crystal panel 11, high display quality can be ensured.
- the manufacturing method of the diffusion plate 30 includes an extrusion process for extruding the base material 32, and a pattern in which the optical pattern 33 and the identification pattern 34 are formed on the same surface of the base material 32 with the same material. Forming step. If it does in this way, in the pattern formation process, optical pattern 33 and discernment pattern 34 can be formed with the same material to the 1st surface 30a which is the same surface in substrate 32 obtained through an extrusion molding process. . Therefore, it is not necessary to add a special process or apparatus for forming the identification pattern 34, and the identification pattern 34 can be formed at a low cost. Further, by visually observing the identification pattern 34, it is possible to distinguish between the case where the manufactured base material 32 is in the first posture and the case where the second posture is reversed from the first posture. It is said.
- the base material 32 is transported along the extending direction of the linear portion 35.
- the identification pattern 34 is formed on the substrate 32 to be conveyed.
- the extending direction of the linear portion 35 of the identification pattern 34 and the conveyance of the substrate 32 are performed. Since the direction coincides with the direction, the identification pattern 34 can be easily formed.
- Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- the linear portion 35-1 forming the identification pattern 34-1 is composed of a plurality of line segments 35a arranged intermittently.
- Each line segment 35a has a straight shape along the X-axis direction that is the extending direction of the linear portion 35-1.
- each branch-shaped part 36-1 is made into the form which is continuous over the full length and has no cut
- the linear portion 35-1 is composed of a plurality of line segments 35a arranged intermittently. In this way, compared to the case where the linear portion is continuously formed over the entire length, less material is required to form the identification pattern 34, so the identification pattern 34 can be formed at a low cost. Can do.
- the linear portion 35-1 and each branch portion 36 forming the identification pattern 34-2 are each composed of a plurality of line segments 35a and 36a arranged intermittently. In this way, since the material cost for forming the identification pattern 34-2 can be further reduced as compared with the first modification, the manufacturing cost of the entire diffusion plate 30-2 can be more suitably reduced. .
- the identification pattern 34-3 has both end portions (both ineffective light emitting regions) sandwiching the central portion (effective light emitting region EA) in the short side direction of the diffusion plate 30-3 (base material 32-3).
- NEA includes a first identification pattern 34A disposed at the lower end of the figure and a second identification pattern 34B disposed at the upper end of the figure. Since the first identification pattern 34A has the same shape as the identification pattern 34 described in the first embodiment, a detailed description thereof is omitted.
- the second identification pattern 34B includes a linear portion 35B that traverses the entire length of the substrate 32-3 along the long side direction (X-axis direction), and ends from the linear portion 35B.
- each branch portion 36B has the same shape and arrangement as each branch portion 36A of the first identification pattern 34A, and the gradient with respect to the straight portion 35B is the same as each branch portion 36A (lower left as shown in FIG. 15). It is said.
- the first identification pattern 34A and the second identification pattern 34B pass through the center of the diffusion plate 30-3 and pass through the first line L1 parallel to the long side direction and the center of the diffusion plate 30-3 and the first.
- the first line L1 and the second line L2 orthogonal to each other are each non-axisymmetric. Therefore, when the diffusion plate 30-3 is reversed from the normal posture shown in FIG.
- the branch portions 36A and 36B in the identification patterns 34A and 34B have a downward slope, and have a slope opposite to that in the normal posture. As a result, it is possible to easily identify whether the diffusion plate 30-3 is in the normal posture or the non-normal posture inverted from the normal posture.
- the optical pattern 33 is formed in the central portion of the base material 32-3, while the identification pattern 34-3 has the central portion of the base material 32-3.
- the first identification pattern 34A formed at one end portion and the second identification pattern 34B formed at the other end portion. In this way, the visibility can be further improved by forming the identification pattern 34-3 on both ends of the base material 32-3.
- first identification pattern 34A and the second identification pattern 34B pass through the center of the base material 32-3 and are orthogonal to the arrangement direction (Y-axis direction) of the center portion, one end portion, and the other end portion. It is formed so as to be axisymmetric with respect to L1.
- the center passes through the center of the base material 32-3 from the first posture, and at the center, one end, and the other
- the arrangement of the first identification pattern 34A and the second identification pattern 34B is reversed in the case where the second posture (non-regular posture) is reversed around the line L1 perpendicular to the alignment direction with the end of Since each shape changes, the discrimination
- two branch portions 36B-4 forming the second identification pattern 34B-4 are formed, and the number of the branch portions 36B-4 is the number of the branch portions 36A of the first identification pattern 34A (4 Book).
- the branch portions 36A and 36B- are formed at the upper and lower ends of the diffusion plate 30-4. Since the number 4 changes from the case of the normal posture, the normal posture and the non-normal posture can be more easily distinguished, and the workability is excellent.
- Modification 5 of Embodiment 1 Modification 5 of Embodiment 1 will be described with reference to FIG. Here, what changed further the number of installation of branch-like part 36A-5, 36B-5 from the above-mentioned modification 4 is shown.
- one branch portion 36A-5 forming the first identification pattern 34A-5 and one branch portion 36B-5 forming the second identification pattern 34B-5 are formed.
- the branch portion 36A-5 of the first identification pattern 34A-5 is arranged near the right end shown in FIG. 17, that is, at the lower right corner position of the diffusion plate 30-5, whereas the branch of the second identification pattern 34B-5 is arranged.
- the shape portion 36B-5 is disposed near the left end of the drawing, that is, at the upper left corner of the diffusion plate 30-5. Accordingly, when the diffuser plate 30-5 is reversed from the normal posture to the non-normal posture around the first line L1, and when it is reversed from the normal posture to the non-normal posture around the second line L2.
- both branch portions 36A-5 and 36B-5 in both identification patterns 34A-5 and 34B-5 have a downward slope, which is opposite to the normal posture.
- the branch portions 36A-5 and 36B-5 are arranged at the upper right corner position and the lower left corner position of the diffuser plate 30-5, respectively, and the angular positions are opposite to those in the normal posture. .
- Modification 6 of Embodiment 1 will be described with reference to FIG. Here, the modification of the gradient of the branch portion 36B-6 forming the second identification pattern 34B-6 from the above-described modification 3 is shown.
- the branch portion 36B-6 that forms the second identification pattern 34B-6 has a slope that rises to the left, and the gradient of the branch portion 36A of the first identification pattern 34A (the slope that falls to the left).
- the gradient is the opposite of (gradient). Accordingly, the first identification pattern 34A and the second identification pattern 34B-6 are symmetrical with respect to the first line L1. Even in such a configuration, the first identification pattern 34A and the second identification pattern 34B-6 are non-axisymmetric with respect to the second line L2, and thus are reversed from the normal posture around the second line L2. An irregular posture can be identified.
- Embodiment 2 shows what changed the form of the branch-shaped part 37 in the identification pattern 134 from Embodiment 1 mentioned above.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- each branch portion 37 has a triangular shape protruding from the straight portion 135 toward the end side (one side), that is, the side opposite to the effective light emitting area EA side. Five of them are arranged in parallel along 135 at equal intervals.
- each branch portion 37 includes a first side 37 a along the linear portion 135, a second side 37 b orthogonal to the linear portion 135, and a third side 37 c inclined with respect to the linear portion 135.
- the same material as that of the optical pattern 33 is solid-coated all over the region surrounded by the three sides 37a to 37c.
- the third side 37c which is the hypotenuse in the right-angled triangular branch portion 37, is longer than both the first side 37a and the second side 37b that are adjacent sides.
- the third side 37c has an oblique line shape that has a downward slope in the figure.
- the first side 37a is longer than the second side 37b.
- the branch portion 37 is asymmetric with respect to the third line L3 passing through the center thereof and orthogonal to the straight portion 135.
- the diffusion plate 130 base material 132
- the non-normal posture is reversed from the normal posture to the periphery of the second line L2.
- the third side 37c of each branch-like portion 37 in the identification pattern 134 has a downward slope, which is in the opposite direction to the normal posture. Thereby, it is possible to easily identify whether the diffusion plate 130 is in the normal posture or the non-normal posture reversed from the normal posture.
- the branch portion 37 includes the first side 37 a along the linear portion 135, and the second side 37 b and the third side 37 c intersecting the linear portion 135.
- the second side 37b and the third side 37c have different lengths. In this way, since the lengths of the second side 37b and the third side 37c intersecting the linear portion 135 are different from each other, the positional relationship between the second side 37b and the third side 37c. Thus, the posture of the base material 32 can be identified.
- the branch portion 37 has a right triangle shape in which the second side 37b is a side orthogonal to the linear portion 135 and the third side 37c is an oblique side inclined with respect to the linear portion 135. In this way, the second side 37b and the third side 37c can be easily distinguished from each other, so that the workability of the identification work can be further improved.
- Embodiment 2 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- Modification 1 of Embodiment 2 Modification 1 of Embodiment 2 will be described with reference to FIG. Here, a pair of identification patterns 134-1 is formed. In this modification, it can be said that the technical matter of the modification 3 of the first embodiment is applied to the configuration of the second embodiment.
- the identification pattern 134-1 has both end portions (both ineffective light emitting regions) sandwiching the central portion (effective light emitting region EA) in the short side direction of the diffusion plate 130-1 (base material 132-1).
- NEA includes a first identification pattern 134A disposed at the lower end of the figure and a second identification pattern 134B disposed at the upper end of the figure. Since the first identification pattern 134A has the same shape as the identification pattern 134 described in the second embodiment, detailed description thereof is omitted.
- the second identification pattern 134B includes a linear portion 135B that crosses the entire length of the base material 132-1 along the long side direction (X-axis direction), and ends from the linear portion 135B.
- Each branch portion 137B of the second identification pattern 134B has a slope in which the third side 137Bc descends to the left, and is similar to the gradient of the third side 137Ac in each branch portion 137A of the first identification pattern 134A.
- the first identification pattern 134A and the second identification pattern 134B are non-axisymmetric with respect to both the first line L1 and the second line L2. Therefore, when the diffusion plate 130-1 is reversed from the normal posture shown in FIG.
- the third sides 137Ac and 137Bc of the branch portions 137A and 137B in the identification patterns 134A and 134B have a downward slope, which is the reverse of the normal posture. .
- Modification 2 of Embodiment 2 will be described with reference to FIG.
- the modification of the gradient of the branch portion 137B-2 forming the second identification pattern 134B-2 from the above-described modification 1 is shown.
- the technical matter of the modification 6 of the first embodiment is applied to the configuration of the second embodiment.
- the third side 137Bc-2 of the branch portion 137B-2 forming the second identification pattern 134B-2 has an upward slope, and the branch portion of the first identification pattern 134A.
- the slope of the third side 137Ac of 137A (the slope of the lower left) is the opposite slope. Accordingly, the first identification pattern 134A and the second identification pattern 134B-2 have a line-symmetric shape with respect to the first line L1. Even in such a configuration, since the first identification pattern 134A and the second identification pattern 134B-2 are non-axisymmetric with respect to the second line L2, they are reversed from the normal posture around the second line L2. An irregular posture can be identified.
- the branch portion 37-3 having a right triangle shape is constituted by lines along the sides 37a-3 to 37c-3. That is, the branch portion 37-3 is in a white state in which the material forming the identification pattern 134-3 does not exist in the region surrounded by the sides 37a-3 to 37c-3. In this way, since the material cost for forming the identification pattern 134-3 can be reduced, the manufacturing cost of the entire diffusion plate 130-3 can be more suitably reduced.
- the first side 37 a-3 is arranged so as to overlap with the linear part 135, and thus is constituted by a part of the linear part 135.
- the branch portion 37-4 is composed of a plurality of line segments 37d arranged intermittently. In this way, since the material cost for forming the identification pattern 134-4 can be further reduced, the manufacturing cost of the entire diffusion plate 130-4 can be more suitably reduced.
- each branch portion 38 has an L-shape projecting from the linear portion 235 toward the end side (one side), that is, the side opposite to the effective light emitting area EA side. Four of them are arranged in parallel along the portion 235 at equal intervals.
- each branch portion 38 includes a first portion 38 a orthogonal to the linear portion 235 and a second portion 38 b parallel to the linear portion 235.
- the first part 38 a is continuous with the linear part 235, while the second part 38 b is arranged between the linear part 235 with an interval corresponding to the length of the first part 38 a.
- the second part 38b protrudes from the protruding tip of the first part 38a toward the right side shown in FIG.
- the branch portion 38 is composed of a plurality of line segments 38c that are intermittently arranged over the entire length.
- the identification pattern 234 is the upper end of the diffusing plate 230 in the upper side of FIG. Part, that is, the end part on the opposite side to the case of the normal posture.
- each branch-like portion 38 of the identification pattern 234 has the second portion 38b from the first portion 38a. Projects toward the left side, that is, the side opposite to the normal posture.
- the branch portion 38 includes the first portion 38 a that is a portion orthogonal to the linear portion 235 and the second portion 38 b that is a portion parallel to the linear portion 235. It has an L shape. In this way, the identification pattern 234 can be more easily recognized by the L-shaped branch portion 38 including the first portion 38 a orthogonal to the linear portion 235 and the second portion 38 b parallel to the linear portion 235. Become.
- Embodiment 3 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- the linear portion 235-1 forming the identification pattern 234-1 is composed of a plurality of line segments 235a arranged intermittently.
- Each line segment 235a has a straight shape along the X-axis direction, which is the extending direction of the linear portion 235-1.
- each branch-shaped part 38-1 is made into the form which is continuous over the full length and has no cut
- the linear portion 235-1 and each branch portion 38 forming the identification pattern 234-2 are each composed of a plurality of line segments 235a and 38c arranged intermittently. In this way, since the material cost for forming the identification pattern 234-2 can be further reduced as compared with the first modification, the manufacturing cost of the entire diffusion plate 230-2 can be more suitably reduced. .
- Modification 3 of Embodiment 3 A third modification of the third embodiment will be described with reference to FIG. Here, a pattern in which a pair of identification patterns 234-3 similar to those of Modification 1 described above is formed is shown. In this modification, it can be said that the technical matter of the modification 3 of the first embodiment is applied to the configuration of the modification 1 of the third embodiment.
- the identification pattern 234-3 includes both end portions (both ineffective light emitting regions) sandwiching the central portion (effective light emitting region EA) in the short side direction of the diffusion plate 230-3 (base material 232-3).
- NEA includes a first identification pattern 234A disposed at the lower end of the figure and a second identification pattern 234B disposed at the upper end of the figure. Since the first identification pattern 234A has the same shape as the identification pattern 234 described in the third embodiment, a detailed description thereof is omitted.
- the second identification pattern 234B includes a linear portion 235B that traverses the entire length of the base material 232-3 along the long side direction (X-axis direction), and ends from the linear portion 235B. And four branch portions 38B projecting toward the side opposite to the effective light emitting area EA side.
- Each branch portion 38B is configured such that the first portion 38Ba to the second portion 38Bb protrude toward the left side shown in FIG. 27, that is, the side opposite to the second portion 38Ab of each branch portion 38A of the first identification pattern 234A. It is said.
- the first identification pattern 234A and the second identification pattern 234B are non-axisymmetric with respect to both the first line L1 and the second line L2.
- the diffusion plate 230-3 when the diffusion plate 230-3 is reversed from the normal posture shown in FIG. 27 to the non-normal posture around the first line L1, the upper and lower arrangements in the identification patterns 234A and 234B are reversed.
- the second portions 38Ab and 38Bb of the branch portions 38A and 38B protrude in the opposite direction to that in the normal posture.
- the diffuser plate 230-3 when the diffuser plate 230-3 is reversed from the normal posture to the non-normal posture around the second line L2, the left and right arrangements are reversed, so that each branch portion in both identification patterns 234A and 234B is reversed.
- Each of the second parts 38Ab and 38Bb of 38A and 38B protrudes in the opposite direction to that in the normal posture.
- ⁇ Embodiment 4> A fourth embodiment of the present invention will be described with reference to FIG. 28 or FIG.
- a cold cathode tube 50 is used as a light source and a light source holding member 51 is added.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- the cold-cathode tube 50 that forms a light source (linear light source) in the present embodiment has an elongated tubular shape (linear shape) and is a hollow elongated glass sealed at both ends.
- mercury, rare gas, and the like are sealed, and a fluorescent material is applied to the inner wall surface.
- a relay connector (not shown) is disposed at each end of the cold cathode tube 50, and the relay connector is connected to a lead terminal protruding from the electrode to the outside of the glass tube.
- the cold cathode tube 50 is connected to an inverter board (not shown) attached to the outer surface side of the bottom plate 14a of the chassis 14 through this relay connector, and its drive can be controlled.
- the outer diameter of the cold cathode tube 50 is smaller than the outer diameter (for example, about 15.5 mm) of the hot cathode tube 17 shown in the first embodiment, and is about 4 mm, for example.
- the cold cathode tubes 50 having the above-described structure are arranged in parallel with each other at a predetermined interval (arrangement pitch) with the length direction (axial direction) aligned with the long side direction of the chassis 14. In this state, it is housed in the chassis 14 in an unevenly distributed form. More specifically, the bottom plate 14a of the chassis 14 (portion facing the diffusion plate 30) is positioned at the first end portion 14A in the short side direction and the end portion on the opposite side to the first end portion 14A. When divided into the second end portion 14B and the central portion 14C sandwiched between them, the cold cathode fluorescent lamp 50 is disposed at the central portion 14C of the bottom plate 14a, and forms a light source arrangement region LA therein. .
- the light source arrangement area LA according to the present embodiment is wider than that of the first embodiment.
- the cold cathode tube 50 is not disposed at the first end portion 14A and the second end portion 14B of the bottom plate 14a, and a light source non-arrangement region LN is formed here.
- a light source holding member 51 for holding the cold cathode tube 50 is attached to the bottom plate 14 a of the chassis 14.
- the light source holding member 51 protrudes from the main body portion 51a along the bottom plate 14a, the light source holding portion 51b that protrudes from the main body portion 51a to the front side and can hold the cold cathode tube 50, and the main body portion 51a to the front side.
- a support part 51c capable of supporting the diffusion plate 30 from the back side and a mounting part 51d protruding from the main body part 51a to the back side and attached to the bottom plate 14a.
- a fifth embodiment of the present invention will be described with reference to FIG. 30 or FIG.
- an LED 60 is used as a light source.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- a large number of LEDs 60 serving as a light source in the present embodiment are mounted on the LED substrate 61 accommodated in the chassis 14, so that the LEDs 60 as a whole extend along the X-axis direction.
- An existing linear light source is configured.
- the LED substrate 61 is made of a synthetic resin having a white surface with excellent light reflectivity.
- the LED substrate 61 extends along the bottom plate 14a of the chassis 14 and is fixed to the bottom plate 14a by fixing means (not shown). Has been.
- the LED substrate 61 has a rectangular shape that is horizontally long when seen in a plan view, and is attached to the bottom plate 14 a with its long side direction aligned with the long side direction of the chassis 14.
- the short side dimension of the LED board 61 is smaller than the vertical dimension of the screen (short side dimension of the chassis 14), and the long side dimension of the LED board 61 is substantially equal to the horizontal dimension of the screen (long side dimension of the chassis 14). Is done. Further, a wiring pattern made of a metal film is formed on the LED substrate 61, and the LED 60 is mounted at a predetermined position. An external control board (not shown) is connected to the LED board 61, and electric power necessary for lighting the LED 60 is supplied from the LED board 61, and drive control of the LED 60 is possible.
- the LED 60 is a so-called surface-mount type that is surface-mounted on the LED substrate 61, and a large number of LEDs 60 are arranged in a grid pattern (in a matrix) on the front surface of the LED substrate 61 in the X-axis direction and the Y-axis direction. Is arranged.
- Each LED 60 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 61.
- the LED 60 is a top type in which the surface opposite to the mounting surface with respect to the LED substrate 61 is a light emitting surface.
- a bottom plate 14a of the chassis 14 (a portion facing the diffuser plate 30) is formed with a first end portion 14A in the short side direction and a second end portion 14B located at the end opposite to the first end portion 14A.
- the LED substrate 61 on which a large number of LEDs 60 are mounted is disposed in the central portion 14C of the bottom plate 14a, and the light source arrangement region LA is formed here.
- the LED substrate 61 is not disposed on the first end portion 14A and the second end portion 14B of the bottom plate 14a, and a light source non-arrangement region LN is formed here. That is, the LED 60 and the LED substrate 61 form the light source arrangement region LA in a form that is unevenly distributed in the central portion in the short side direction of the bottom plate 14 a of the chassis 14.
- a distribution as shown in FIG. 32 may be used as a modification of the distribution mode of the light reflectance applied to the diffusion plate by the optical pattern. Specifically, by adjusting the distribution density of the dots of the optical pattern, as shown in FIG. 32, in the light source overlapping portion DA in the diffusion plate, the light reflection rate is made substantially uniform, for example, 65%.
- the light reflectance is gradually decreased from the side closer to the light source overlapping portion DA to the side farther (changes to a slope shape) in the light source non-overlapping portion DN. 30% of the minimum value at both ends in the short side direction (Y-axis direction).
- the distribution pattern of the light reflectance given to the diffusion plate by the optical pattern can be changed. Specifically, by adjusting the distribution density of the dots of the optical pattern. 33, as shown in FIG. 33, the light reflectance can be gradually decreased stepwise from the light source overlapping part DA to the light source non-overlapping part DN, that is, can be changed in a stripe shape along the short side direction (Y-axis direction). It is.
- the reflection pattern and the identification pattern are printed directly on the base material.
- the reflection pattern and the identification pattern are printed on a transparent sheet that is a separate member from the base material.
- the sheet may be bonded to the substrate.
- the slanted branch-shaped portion has a left-lowering shape when in a normal posture.
- it may be a right-lowering shape.
- the specific inclination angle with respect to the linear part of the branch-shaped part which makes a diagonal line shape can be changed suitably.
- the branch portion has an oblique line shape that is inclined with respect to the linear portion.
- the branch portion may be orthogonal to the linear portion.
- the branch-shaped portion has a right-angled triangle shape with three side lengths different from each other.
- the branch-shaped portion has a right-angled isosceles triangle shape / equilateral triangle shape.
- -It is also possible to use a non-right-angled triangle shape, a non-right-angled isosceles triangle shape, etc. in which the lengths of the three sides are different.
- the branch portion can be formed in a quadrangular shape or a pentagonal shape.
- the branch portion has an L shape.
- the branch portion may have a J shape, a V shape, a U shape, or the like. Is possible.
- the number of branch portions of the pair of identification patterns is the same as that of Modification 5 of Embodiment 1.
- One branch may be provided, and each branch may be disposed at the opposite corner of the diffuser plate.
- both the linear portion and the branch-shaped portion are a plurality of line segments. You may comprise by.
- the identification pattern is arranged at one end or both end portions in the short side direction of the diffusion plate.
- the identification pattern is one end portion or both end portions in the long side direction of the diffusion plate. Also included in the present invention.
- the present invention includes a configuration in which the identification pattern is point-symmetric with respect to the center point of the diffusion plate.
- the identification pattern is asymmetric with respect to the first line and the second line, or the identification pattern is asymmetric only with respect to the second line.
- the present invention also includes a pattern in which the identification pattern is non-axisymmetric only with respect to the first line (a pattern that is axisymmetric with respect to the second line). It is.
- the branch portion protrudes from the linear portion to the end side.
- the branch portion extends from the linear portion to the center side (effective light emitting region side, optical pattern side).
- a protruding form is also possible.
- the branch portion is configured to protrude from the linear portion only to one side.
- the branch portion is configured to protrude from the linear portion to both sides. It is also possible.
- the branch portion is asymmetric with respect to the third line passing through the center thereof.
- the plurality of branch portions are arranged at equal intervals.
- the present invention includes one in which the branch portions are arranged at unequal pitches.
- the linear portion is configured to traverse the diffusion plate over the entire length. However, the linear portion is configured not to traverse the diffusion plate over the entire length. included.
- the linear part or the branch part is constituted by a plurality of intermittent line segments
- the specific values of the length, number, and interval between the line segments (arrangement pitch of the line segments) are appropriately determined. It can be changed.
- the optical pattern is shown to be symmetrical with respect to the first line and the second line. However, the optical pattern is non-axisymmetric with respect to the first line.
- the present invention includes a configuration that is non-axisymmetric with respect to the second line and a configuration that is non-symmetric with respect to both the first line and the second line. included.
- each dot constituting the optical pattern has a round shape, but the shape of each dot is not limited to this, and an arbitrary shape such as an elliptical shape or a polygonal shape is selected. be able to.
- the optical pattern and the identification pattern are formed by printing on the surface of the base material.
- the present invention includes those using other forming means such as metal vapor deposition. It is. In that case, a vapor deposition apparatus or the like may be introduced instead of the printing apparatus used in the diffusion plate manufacturing apparatus. In any case, the optical pattern and the identification pattern can be formed on the substrate in the same process by the same apparatus.
- a cutting step of cutting the base material after passing through a pattern forming step of forming an optical pattern and an identification pattern with respect to the base material as a base material as a manufacturing method of the diffusion plate is shown, after performing a cutting process previously, you may make it perform the pattern formation process which forms an optical pattern and an identification pattern with respect to the cut
- the center portion in the chassis is the light source arrangement region, and the first end and the second end are the light source non-arrangement region.
- at least one of the second end and the second end portion is used as a light source arrangement region, and the other is used as a light source non-arrangement region.
- the first end portion and the central portion can be used as the light source arrangement region, and the second end portion and the central portion can be used as the light source arrangement region.
- the arrangement (range) of the optical pattern on the diffusion plate can be changed, and further, the arrangement of the identification pattern is changed in accordance with the arrangement change of the optical pattern. be able to.
- the light source is unevenly arranged in the chassis (including the light source arrangement region and the light source non-arrangement region). However, the light source is uniformly distributed over the entire area of the chassis.
- the present invention can also be applied to such a configuration.
- Embodiments 1 to 3 described above the one using one hot cathode tube as the light source is shown, but one using two or more hot cathode tubes is also included in the present invention.
- the fourth embodiment six cold cathode tubes are used as the light source, but those having five or fewer cold cathode tubes or seven or more cold cathode tubes are also included in the present invention.
- the present invention includes a type using a discharge tube (such as a mercury lamp) other than the fluorescent tube.
- an LED that is a kind of point light source is used as the light source.
- an LED that uses another type of point light source is also included in the present invention.
- a planar light source such as an organic EL can be used.
- the one using one type of light source is shown. Specifically, a hot cathode tube and a cold cathode tube are mixed, a hot cathode tube and an LED are mixed, a cold cathode tube and an LED are mixed, a hot cathode tube, a cold cathode tube and an LED, May be mixed.
- the liquid crystal panel and the chassis are vertically placed with the short side direction aligned with the vertical direction.
- the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.
- the TFT is used as the switching element of the liquid crystal display device.
- the present invention can also be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode (TFD)).
- a switching element other than the TFT for example, a thin film diode (TFD)
- the present invention can also be applied to a liquid crystal display device for monochrome display.
- the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified.
- the present invention can be applied to display devices using other types of display panels.
- the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device not provided with the tuner.
- the diffusing plate is exemplified as the optical member for forming the optical pattern and the identification pattern.
- other types of optical members such as a diffusing sheet, a lens sheet, and a polarizing reflection sheet are optically used.
- a pattern and an identification pattern are also included in the present invention.
- SYMBOLS 10 Liquid crystal display device (display apparatus), 11 ... Liquid crystal panel (display panel), 12 ... Backlight apparatus (illuminating device), 14 ... Chassis, 14e ... Opening part, 14A ... 1st end part, 14B ... 2nd end Part, 14C ... central part, 15 ... optical member, 17 ... hot cathode tube (light source), 30, 130, 230 ... diffusion plate (optical member), 30a ... first surface (formation surface), 32, 132, 232 ... Substrate, 33 ... optical pattern, 33a ... dot, 34, 134, 234 ... identification pattern, 35, 135, 235 ... linear part, 35a ...
- LA light source arrangement region
- LN light source non-arrangement region
- L1 ... first line
- L2 ... second Line L3
- third line (line) TV, television receiver
Abstract
Description
ところで、上記した拡散板は、その基材における一対の板面のうち一方の板面に対して調光用ドットパターンが形成されており、その調光用ドットパターンの形成面が光源側を向くようバックライト装置に対して組み付けられている。しかしながら、仮に調光用ドットパターンの形成面が光源側とは反対側を向いた姿勢で拡散板がバックライト装置に組み付けられると、光源と調光用ドットパターンとの間に拡散板の基材が介在する形となるため、拡散板が所望の光学性能を発揮できなくなるという問題が生じる。
本発明の光学部材は、透光性を有する基材と、前記基材に形成され、光に光学作用を付与する光学パターンと、前記基材が第1の姿勢とされた場合と前記基材が前記第1の姿勢から表裏反転した第2の姿勢とされた場合とを識別可能とするものであって、前記基材における前記光学パターンの形成面に形成されるとともに前記光学パターンと同一材料からなる識別パターンとを備える。
(1)前記識別パターンは、前記基材の中心を通るとともに前記基材の辺に並行する第1の線及び前記基材の中心を通るとともに前記第1の線と直交する第2の線の少なくともいずれか一方の線に関して非線対称となるよう形成されている。このようにすれば、基材が第1の姿勢とされた場合と、第1の姿勢から第1の線及び第2の線の少なくともいずれか一方の線周りに表裏反転した第2の姿勢とされた場合とを識別することができる。
(1)前記シャーシは、前記光学部材と対向する部分が、前記光源が配される光源配置領域と、前記光源が配されない光源非配置領域とに区分されているのに対し、前記光学部材は、前記光学パターンが光反射性を有する材料からなり、前記光学パターンにより付与される光反射率に関して前記光源配置領域と重畳する部位が、前記光源非配置領域と重畳する部位よりも大きくなるよう形成されている。このようにすれば、光源から出射された光は、まず光学部材のうち光学パターンにより付与される光反射率が相対的に大きい部位に到達するため、その多くが光学パターンにより反射される(つまり透過されない)こととなり、光源からの出射光量に対して照明光の輝度が抑制される。一方、ここで反射された光は、シャーシ内で反射させ、光源非配置領域に到達させることが可能となり得る。光学部材のうち当該光源非配置領域と重畳する部位は、相対的に光学パターンにより付与される光反射率が小さいため、より多くの光が透過されることとなり、所定の照明光の輝度を得ることができる。
(1)前記表示パネルは、画像を表示する中央側の表示領域と、前記表示領域よりも端側の非表示領域とに区分されており、前記光学部材は、前記光学パターンが前記表示領域と重畳する部位に形成されるのに対し、前記識別パターンが前記非表示領域と重畳する部位に形成されている。このようにすれば、表示パネルの表示領域に供給される光に対して光学パターンにより光学作用が付与されることで、良好な表示品位を得ることができる。一方、表示パネルの表示領域に供給される光に対して識別パターンが光学的な影響を及ぼすことが避けられるので、高い表示品位を担保することができる。
(1)前記識別パターンが前記基材の辺に沿って延びる直線状部を有する前記光学部材の製造方法であって、前記基材を前記直線状部の延び方向に沿って搬送するようにした。このようにすれば、パターン形成工程では、搬送される基材に対して識別パターンが形成されるのであるが、このとき識別パターンの直線状部の延び方向と基材の搬送方向とが一致しているので、識別パターンを容易に形成することができる。
本発明によれば、低コストで基材の表裏を識別することができる。
本発明の実施形態1を図1~図12によって説明する。まず、液晶表示装置10を備えたテレビ受信装置TVの構成について説明する。
図1は本実施形態のテレビ受信装置の概略構成を示す分解斜視図、図2は図1のテレビ受信装置が備える液晶表示装置の概略構成を示す分解斜視図、図3は図2の液晶表示装置の短辺方向に沿った断面構成を示す断面図、図4は図2の液晶表示装置の長辺方向に沿った断面構成を示す断面図、図5は図2の液晶表示装置に備わるシャーシにおける熱陰極管及び反射シートの配置構成を示す平面図である。なお、図5においては、シャーシの長辺方向をX軸方向とし、短辺方向をY軸方向としている。
液晶パネル(表示パネル)11は、一対のガラス基板が所定のギャップを隔てた状態で貼り合わせられるとともに、両ガラス基板間に液晶が封入された構成とされる。一方のガラス基板には、互いに直交するソース配線とゲート配線とに接続されたスイッチング素子(例えばTFT)と、そのスイッチング素子に接続された画素電極、さらには配向膜等が設けられている。また、他方のガラス基板には、R(赤色),G(緑色),B(青色)等の各着色部が所定配列で配置されたカラーフィルタや対向電極、さらには配向膜等が設けられている。液晶パネル11のうち、画面の中央部が画像を表示可能な表示領域AAとされるのに対し、表示領域AAを取り囲む外側の額縁状(枠状)の端部が非表示領域NAAとされる。非表示領域NAAには、液晶パネル11のうち、フレーム16にて受けられる部分(図3)、ホルダ19の階段状面にて受けられる部分(図4)、及びベゼル13により表側から覆われる部分(図3及び図4)が含まれる。なお、両基板の外側には偏光板11a,11bが配されている(図3及び図4参照)。
図6は拡散板における光学パターン及び識別パターンを説明するための平面図、図7は図6の拡散板における光学パターンを示す要部拡大平面図、図8は図6の拡散板の短辺方向における光反射率の変化を示すグラフ、図9は図6の拡散板の長辺方向における光反射率の変化を示すグラフである。なお、図8及び図9においては、拡散板の長辺方向をX軸方向とし、短辺方向をY軸方向としている。また、図8において、横軸はY軸方向(短辺方向)を示しており、拡散板の有効発光領域においてY軸方向に沿って図6に示す手前側端部から奥側端部までの光反射率をプロットしたグラフとなっている。同様に、図9において、横軸はX軸方向(長辺方向)を示しており、Y軸方向に沿って図6に示す左側端部から右側端部までの光反射率をプロットしたグラフとなっている。
実施形態1の変形例1について図13を用いて説明する。ここでは、識別パターン34‐1の形態を変更したものを示す。
実施形態1の変形例2について図14を用いて説明する。ここでは、識別パターン34‐2のうち、直線状部35‐1については上記変形例1と同様にし、各枝状部36については上記実施形態1と同様にしたものを示す。
実施形態1の変形例3について図15を用いて説明する。ここでは、識別パターン34‐3を一対形成したものを示す。
実施形態1の変形例4について図16を用いて説明する。ここでは、上記した変形例3から枝状部36B‐4の設置数を変更したものを示す。
実施形態1の変形例5について図17を用いて説明する。ここでは、上記した変形例4から枝状部36A‐5,36B‐5の設置数をさらに変更したものを示す。
実施形態1の変形例6について図18を用いて説明する。ここでは、上記した変形例3から第2識別パターン34B‐6をなす枝状部36B‐6の勾配を変更したものを示す。
本発明の実施形態2を図19によって説明する。この実施形態2では、上記した実施形態1から識別パターン134における枝状部37の形態を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
実施形態2の変形例1について図20を用いて説明する。ここでは、識別パターン134‐1を一対形成したものを示す。本変形例は、実施形態1の変形例3の技術事項を実施形態2の構成に適用したものであると言える。
実施形態2の変形例2について図21を用いて説明する。ここでは、上記した変形例1から第2識別パターン134B‐2をなす枝状部137B‐2の勾配を変更したものを示す。本変形例は、実施形態1の変形例6の技術事項を実施形態2の構成に適用したものであると言える。
実施形態2の変形例3について図22を用いて説明する。ここでは、枝状部37‐3を変更したものを示す。
実施形態2の変形例4について図23を用いて説明する。ここでは、上記した変形例3から枝状部37‐4を変更したものを示す。
本発明の実施形態3を図24によって説明する。この実施形態3では、上記した実施形態1から識別パターン234における枝状部38の形態を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
実施形態3の変形例1について図25を用いて説明する。ここでは、識別パターン234‐1の形態を変更したものを示す。本変形例は、実施形態1の変形例1の技術事項を実施形態3の構成に適用したものであると言える。
実施形態3の変形例2について図26を用いて説明する。ここでは、識別パターン234‐2のうち、直線状部235‐1については上記変形例1と同様にし、各枝状部38については上記実施形態3と同様にしたものを示す。本変形例は、実施形態1の変形例2の技術事項を実施形態3の構成に適用したものであると言える。
実施形態3の変形例3について図27を用いて説明する。ここでは、上記した変形例1と同様の識別パターン234‐3を一対形成したものを示す。本変形例は、実施形態1の変形例3の技術事項を実施形態3の変形例1の構成に適用したものであると言える。
本発明の実施形態4を図28または図29によって説明する。この実施形態4では、光源として冷陰極管50を用いるとともに、光源保持部材51を追加したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明の実施形態5を図30または図31によって説明する。この実施形態5では、光源としてLED60を用いたものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
(1)光学パターンにより拡散板に付与される光反射率の分布態様の変形例として図32に示すような分布とすることも可能である。具体的には、光学パターンのドットの分布密度を調整することで、図32に示すように、拡散板のうち光源重畳部DAにおいては、光反射率を例えば65%で概ね一様として拡散板30内で最大値とする一方、光源非重畳部DNにおいては、光反射率が光源重畳部DAに近い側から遠い側へ向けて連続的に漸次小さくなり(スロープ状に変化し)、拡散板の短辺方向(Y軸方向)の両端部で最小値の30%とする。
Claims (37)
- 透光性を有する基材と、
前記基材に形成され、光に光学作用を付与する光学パターンと、
前記基材が第1の姿勢とされた場合と前記基材が前記第1の姿勢から表裏反転した第2の姿勢とされた場合とを識別可能とするものであって、前記基材における前記光学パターンの形成面に形成されるとともに前記光学パターンと同一材料からなる識別パターンとを備える光学部材。 - 前記識別パターンは、前記基材の中心を通るとともに前記基材の辺に並行する第1の線及び前記基材の中心を通るとともに前記第1の線と直交する第2の線の少なくともいずれか一方の線に関して非線対称となるよう形成されている請求項1記載の光学部材。
- 前記識別パターンは、前記第1の線及び前記第2の線に関してそれぞれ非線対称となるよう形成されている請求項2記載の光学部材。
- 前記光学パターンは、前記基材における中央部に形成されているのに対し、前記識別パターンは、前記基材の前記中央部を挟んだ一対の端部のうち、いずれか一方の端部に形成されている請求項1から請求項3のいずれか1項に記載の光学部材。
- 前記光学パターンは、前記基材における中央部に形成されているのに対し、前記識別パターンは、前記基材の前記中央部を挟んだ一対の端部のうち、一方の端部に形成された第1識別パターンと、他方の端部に形成された第2識別パターンとからなる請求項1から請求項3のいずれか1項に記載の光学部材。
- 前記第1識別パターン及び前記第2識別パターンは、前記基材の中心を通るとともに前記中央部と前記一方の端部及び前記他方の端部との並び方向と直交する線に関して非線対称となるよう形成されている請求項5記載の光学部材。
- 前記光学パターンは、前記基材の中心を通るとともに前記中央部と前記一対の端部との並び方向と直交する線に関して線対称となるよう形成されている請求項4から請求項6のいずれか1項に記載の光学部材。
- 前記識別パターンは、前記基材の辺に沿って延びる直線状部を有する請求項1から請求項7のいずれか1項に記載の光学部材。
- 前記直線状部は、前記基材における一方の端縁からその反対側の他方の端縁まで横切る形態とされる請求項8記載の光学部材。
- 前記直線状部は、全長にわたって連続する形態とされる請求項9記載の光学部材。
- 前記直線状部は、間欠的に配された複数の線分により構成される請求項9記載の光学部材。
- 前記基材は、横長な矩形状をなしており、前記直線状部は、前記基材における長辺方向に沿って延びる形態とされる請求項8から請求項11のいずれか1項に記載の光学部材。
- 前記識別パターンは、前記直線状部から側方へ突出する枝状部を有する請求項8から請求項12のいずれか1項に記載の光学部材。
- 前記枝状部は、等間隔で複数並列して配されている請求項13記載の光学部材。
- 複数の前記枝状部は、同一形状とされる請求項14記載の光学部材。
- 前記枝状部は、前記直線状部から一側方へ突出する形態とされる請求項13から請求項15のいずれか1項に記載の光学部材。
- 前記光学パターンが前記基材における中央側に配されるのに対し、前記識別パターンが前記基材における端側に配されており、前記枝状部は、前記直線状部から端側へ向けて突出する形態とされる請求項16記載の光学部材。
- 前記枝状部は、その中心を通るとともに前記直線状部と直交する線に関して非線対称となるよう形成されている請求項13から請求項17のいずれか1項に記載の光学部材。
- 前記枝状部は、前記直線状部に対して傾斜する斜線状をなしている請求項18記載の光学部材。
- 前記枝状部は、間欠的に配された複数の線分により構成される請求項19記載の光学部材。
- 前記枝状部は、前記直線状部に沿う第1辺と、前記直線状部に対して交差する第2辺及び第3辺とを有する三角形状をなしており、前記第2辺と前記第3辺とで長さが異なるものとされる請求項18記載の光学部材。
- 前記枝状部は、前記第2辺が前記直線状部に対して直交する辺となり且つ前記第3辺が前記直線状部に対して傾斜する斜辺となる直角三角形状をなしている請求項21記載の光学部材。
- 前記枝状部は、前記直線状部と直交する部分と、前記直線状部に並行する部分とからなるL字型をなしている請求項18記載の光学部材。
- 前記光学パターン及び前記識別パターンは、光反射性を有する材料からなる請求項1から請求項23のいずれか1項に記載の光学部材。
- 前記光学パターンは、前記基材における前記光学パターンの形成面において略点状をなす多数のドットからなる請求項24記載の光学部材。
- 前記光学パターン及び前記識別パターンは、白色を呈する請求項24または請求項25記載の光学部材。
- 請求項1から請求項26のいずれか1項に記載の光学部材と、光出射側に向けて開口する開口部を有するとともにその開口部を覆う形で前記光学部材が配されるシャーシと、前記シャーシ内に収容されるとともに前記光学部材に光を照射可能な光源とを備える照明装置。
- 前記シャーシは、前記光学部材と対向する部分が、前記光源が配される光源配置領域と、前記光源が配されない光源非配置領域とに区分されているのに対し、前記光学部材は、前記光学パターンが光反射性を有する材料からなり、前記光学パターンにより付与される光反射率に関して前記光源配置領域と重畳する部位が、前記光源非配置領域と重畳する部位よりも大きくなるよう形成されている請求項27記載の照明装置。
- 前記光学部材は、前記光源配置領域の全域と前記光源配置領域に隣接する前記光源非配置領域の大部分とに対して重畳するとともに出射光が有効利用される有効発光領域と、前記光源非配置領域の一部に対して重畳する非有効発光領域とに区分され、前記光学パターンが前記有効発光領域に形成されるのに対して、前記識別パターンが前記非有効発光領域に形成されている請求項28記載の照明装置。
- 前記光学部材は、前記光学パターンにより付与される光反射率が前記光源から遠ざかる方向へ向けて小さくなるものとされている請求項28または請求項29記載の照明装置。
- 前記シャーシは、前記光学部材と対向する部分が少なくとも、第1端部と、前記第1端部とは反対側の端部に位置する第2端部と、前記第1端部と前記第2端部とに挟まれる中央部とに区分されており、このうち前記中央部が前記光源配置領域とされ、前記第1端部及び前記第2端部が前記光源非配置領域とされる請求項28から請求項30のいずれか1項に記載の照明装置。
- 請求項27から請求項31のいずれか1項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記表示パネルは、画像を表示する中央側の表示領域と、前記表示領域よりも端側の非表示領域とに区分されており、前記光学部材は、前記光学パターンが前記表示領域と重畳する部位に形成されるのに対し、前記識別パターンが前記非表示領域と重畳する部位に形成されている請求項32記載の表示装置。
- 前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルとされる請求項32または請求項33記載の表示装置。
- 請求項32から請求項34のいずれか1項に記載された表示装置を備えるテレビ受信装置。
- 透光性を有する基材と、前記基材に形成され、光に光学作用を付与する光学パターンと、前記基材が第1の姿勢とされた場合と前記基材が前記第1の姿勢から表裏反転した第2の姿勢とされた場合とを識別可能とする識別パターンとを備える光学部材の製造方法であって、
前記基材を押し出し成形する押出成形工程と、前記光学パターン及び前記識別パターンを前記基材における同一面に対して同一材料によって形成するパターン形成工程とを備える光学部材の製造方法。 - 前記識別パターンが前記基材の辺に沿って延びる直線状部を有する前記光学部材の製造方法であって、前記基材を前記直線状部の延び方向に沿って搬送するようにした請求項36記載の光学部材の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011541858A JPWO2011062024A1 (ja) | 2009-11-20 | 2010-10-21 | 光学部材、照明装置、表示装置、テレビ受信装置、及び光学部材の製造方法 |
EP10831420A EP2503228A1 (en) | 2009-11-20 | 2010-10-21 | Optical member, lighting device, display apparatus, television receiver, and manufacturing method of optical member |
US13/508,047 US8870400B2 (en) | 2009-11-20 | 2010-10-21 | Optical member, lighting device, display device and television receiver, and method of manufacturing the optical member |
CN2010800507073A CN102597609A (zh) | 2009-11-20 | 2010-10-21 | 光学构件、照明装置、显示装置、电视接收装置和光学构件的制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-265350 | 2009-11-20 | ||
JP2009265350 | 2009-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011062024A1 true WO2011062024A1 (ja) | 2011-05-26 |
Family
ID=44059508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/068584 WO2011062024A1 (ja) | 2009-11-20 | 2010-10-21 | 光学部材、照明装置、表示装置、テレビ受信装置、及び光学部材の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8870400B2 (ja) |
EP (1) | EP2503228A1 (ja) |
JP (1) | JPWO2011062024A1 (ja) |
CN (1) | CN102597609A (ja) |
WO (1) | WO2011062024A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014089375A (ja) * | 2012-10-31 | 2014-05-15 | Dainippon Printing Co Ltd | 光制御シート及び光制御シート付き光入射部 |
JP2014089374A (ja) * | 2012-10-31 | 2014-05-15 | Dainippon Printing Co Ltd | 光制御シート及び光制御シート付き光取入部 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012002019A1 (ja) * | 2010-06-29 | 2012-01-05 | シャープ株式会社 | 表示装置 |
KR101741821B1 (ko) * | 2011-06-09 | 2017-06-15 | 엘지디스플레이 주식회사 | 액정표시장치 |
EP2933550B1 (en) | 2012-12-17 | 2020-09-02 | LG Innotek Co., Ltd. | Rear-side area warning module |
US10036837B2 (en) * | 2013-11-08 | 2018-07-31 | Sharp Kabushiki Kaisha | Mother substrate, light-control member, method for manufacturing light-control member, and display device |
KR20150097888A (ko) * | 2014-02-18 | 2015-08-27 | 삼성디스플레이 주식회사 | 백라이트 유닛 |
KR102339539B1 (ko) * | 2015-05-08 | 2021-12-16 | 삼성전자주식회사 | 디스플레이 장치 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005117023A (ja) | 2003-09-19 | 2005-04-28 | Sony Corp | バックライト装置及び液晶表示装置 |
JP3899483B2 (ja) * | 2001-10-04 | 2007-03-28 | 富士フイルム株式会社 | 配向膜付き透明フィルムの製造方法 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3430951B2 (ja) * | 1999-01-13 | 2003-07-28 | セイコーエプソン株式会社 | 表示装置および電子時計 |
JP4170084B2 (ja) * | 2002-12-04 | 2008-10-22 | 三菱電機株式会社 | 面状光源装置及び表示装置 |
US7495717B2 (en) * | 2003-02-28 | 2009-02-24 | Lg. Display Co., Ltd. | Liquid crystal display module having a light sheet with hardened part |
US7185995B2 (en) | 2003-09-19 | 2007-03-06 | Sony Corporation | Backlight device and liquid crystal display |
JP4217196B2 (ja) * | 2003-11-06 | 2009-01-28 | インターナショナル・ビジネス・マシーンズ・コーポレーション | ディスプレイ駆動装置、画像表示システム、および表示方法 |
JP2005183363A (ja) * | 2003-11-25 | 2005-07-07 | Sharp Corp | 導光板、それを備えた照明装置、及び、液晶表示装置、並びに、導光板成形型 |
TW200745680A (en) * | 2006-04-19 | 2007-12-16 | Omron Tateisi Electronics Co | Diffuser plate and surface light source device |
KR101290584B1 (ko) * | 2006-06-29 | 2013-07-30 | 엘지디스플레이 주식회사 | 직하형 백라이트 유닛 및 직하형 백라이트 유닛에서의확산판 제조방법 |
JP2008020722A (ja) * | 2006-07-13 | 2008-01-31 | Fuji Xerox Co Ltd | 光導波路及びその製造方法 |
JP4353224B2 (ja) * | 2006-09-25 | 2009-10-28 | エプソンイメージングデバイス株式会社 | 光検出装置、電気光学装置、および電子機器 |
CN101424754B (zh) | 2007-10-31 | 2011-02-02 | 颖台科技股份有限公司 | 扩散板与扩散板组 |
CN101435884A (zh) | 2007-11-15 | 2009-05-20 | 鸿富锦精密工业(深圳)有限公司 | 扩散板及采用该扩散板的背光模组 |
JP5209283B2 (ja) * | 2007-11-27 | 2013-06-12 | 新日鉄住金化学株式会社 | 光拡散板用樹脂組成物及び光拡散板 |
JP2009229879A (ja) * | 2008-03-24 | 2009-10-08 | Teijin Chem Ltd | 光拡散板 |
KR101260839B1 (ko) * | 2008-04-16 | 2013-05-06 | 엘지디스플레이 주식회사 | 백라이트 유닛 및 이를 구비한 액정표시장치모듈 |
JP2010072435A (ja) * | 2008-09-19 | 2010-04-02 | Fuji Xerox Co Ltd | 光導波路フィルム |
US8317384B2 (en) * | 2009-04-10 | 2012-11-27 | Intellectual Discovery Co., Ltd. | Light guide film with cut lines, and optical keypad using such film |
-
2010
- 2010-10-21 WO PCT/JP2010/068584 patent/WO2011062024A1/ja active Application Filing
- 2010-10-21 JP JP2011541858A patent/JPWO2011062024A1/ja active Pending
- 2010-10-21 EP EP10831420A patent/EP2503228A1/en not_active Withdrawn
- 2010-10-21 US US13/508,047 patent/US8870400B2/en not_active Expired - Fee Related
- 2010-10-21 CN CN2010800507073A patent/CN102597609A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3899483B2 (ja) * | 2001-10-04 | 2007-03-28 | 富士フイルム株式会社 | 配向膜付き透明フィルムの製造方法 |
JP2005117023A (ja) | 2003-09-19 | 2005-04-28 | Sony Corp | バックライト装置及び液晶表示装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014089375A (ja) * | 2012-10-31 | 2014-05-15 | Dainippon Printing Co Ltd | 光制御シート及び光制御シート付き光入射部 |
JP2014089374A (ja) * | 2012-10-31 | 2014-05-15 | Dainippon Printing Co Ltd | 光制御シート及び光制御シート付き光取入部 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011062024A1 (ja) | 2013-04-04 |
CN102597609A (zh) | 2012-07-18 |
US8870400B2 (en) | 2014-10-28 |
EP2503228A1 (en) | 2012-09-26 |
US20120212676A1 (en) | 2012-08-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2011062024A1 (ja) | 光学部材、照明装置、表示装置、テレビ受信装置、及び光学部材の製造方法 | |
KR101237788B1 (ko) | 엘이디 발광유닛 및 엘이디 백라이트어셈블리와액정표시장치모듈 | |
KR101220204B1 (ko) | 엘이디 백라이트어셈블리 및 이를 이용한 액정표시장치모듈 | |
CN1975536B (zh) | 背光组件及具有该背光组件的显示器件 | |
KR101183447B1 (ko) | 액정표시장치용 반사시트 및 이를 이용한백라이트어셈블리와 액정표시장치모듈 | |
JP2008041639A (ja) | バックライトユニット及びこれを備えた表示装置 | |
JP5286419B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
JP5286418B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
WO2011033896A1 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
EP2133738A1 (en) | Optical member unit, lighting device for display, display, and television receiver | |
JP5194172B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
JP4975189B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
JP5203508B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
JP5323198B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
US8807805B2 (en) | Lighting device, display device and television receiver | |
US20130135536A1 (en) | Illuminating device, display device and television receiving device | |
JP5144810B2 (ja) | 照明装置、表示装置、及びテレビ受信装置 | |
KR20080080764A (ko) | 백 라이트 유닛 및 이를 이용한 액정표시장치 | |
KR20200136536A (ko) | 게임기의 이중 표시장치에 대한 결합 어셈블리 | |
JP2008311003A (ja) | ランプホルダ、バックライトユニットおよび表示装置 | |
KR20130107608A (ko) | 액정표시장치 | |
KR102123073B1 (ko) | 백라이트 유닛 및 이를 포함하는 액정표시장치 | |
KR20060131246A (ko) | 백라이트 어셈블리 및 이를 갖는 표시장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080050707.3 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10831420 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011541858 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13508047 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010831420 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |