WO2017169262A1 - 表示装置 - Google Patents
表示装置 Download PDFInfo
- Publication number
- WO2017169262A1 WO2017169262A1 PCT/JP2017/005866 JP2017005866W WO2017169262A1 WO 2017169262 A1 WO2017169262 A1 WO 2017169262A1 JP 2017005866 W JP2017005866 W JP 2017005866W WO 2017169262 A1 WO2017169262 A1 WO 2017169262A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- mounting substrate
- display panel
- display device
- emitting element
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- 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
- F21V19/00—Fastening of light sources or lamp holders
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- This disclosure relates to a display device that displays images such as still images and moving images.
- a display device such as a television device or a monitor for a computer
- a thin display device such as a liquid crystal panel or an organic EL (Electro Luminescence) display panel.
- the liquid crystal display device is a display device that does not emit light. Therefore, in the liquid crystal display device, an LED (Light Emitting Diode) or the like is provided on the back surface (the surface opposite to the surface viewed by the user) of the display panel included in the display device so that the user can view images even in a dark place. A light emitting element is arranged, and the light emitted from the LED and transmitted through the display panel reaches the user.
- LED Light Emitting Diode
- the display device having such a configuration has, for example, a configuration in which light emitting elements such as LEDs are arranged in a matrix at intervals. Therefore, the display device may include a reflection sheet for reflecting the light that travels to the opposite side of the display panel after being emitted from the light emitting element to the display panel side.
- Patent Document 1 discloses a display device in which a reflective sheet is attached to a back plate.
- a display device including a light emitting element such as an LED loses power input to the LED due to heat loss of the LED, or the reflective sheet is lifted from a predetermined position, and a gap is formed on the back surface side of the reflective sheet (hereinafter referred to as such).
- a light emitting element such as an LED loses power input to the LED due to heat loss of the LED, or the reflective sheet is lifted from a predetermined position, and a gap is formed on the back surface side of the reflective sheet (hereinafter referred to as such).
- an optical loss (a part of the light emitted from the light emitting element is lost) may occur due to the fact that the reflecting sheet is lifted.
- the present disclosure provides a display device capable of reducing heat loss and optical loss.
- the display device includes a display panel that displays an image, a plurality of elongated mounting boards that are arranged along the display panel, and a plurality of the mounting boards that are arranged in the longitudinal direction of each of the mounting boards.
- a display panel that displays an image
- a plurality of elongated mounting boards that are arranged along the display panel
- a plurality of the mounting boards that are arranged in the longitudinal direction of each of the mounting boards.
- Light emitted from the back side of the panel toward the display panel light emitting elements arranged in a matrix along the display panel, a back plate on which the plurality of mounting boards are bonded by an adhesive member, and the back
- a reflective sheet attached to a face plate, having a hole through which the light emitting element penetrates at a position corresponding to the light emitting element, and reflecting light emitted from the light emitting element toward the display panel
- Each of the mounting boards is composed of a flexible wiring board.
- the display device according to the present disclosure can reduce heat loss and optical loss.
- FIG. 1 is a perspective view schematically showing an example of the appearance of the display device according to the first embodiment.
- FIG. 2 is an exploded perspective view schematically showing an example of the structure of the display device in the first embodiment.
- FIG. 3 is a diagram schematically illustrating a configuration example of the light-emitting element and the mounting substrate that constitute the light-emitting module according to Embodiment 1.
- FIG. 4 is a diagram schematically illustrating an example of a relay board constituting the light emitting module in the first embodiment.
- FIG. 5 is a diagram schematically illustrating an example of the reflection sheet in the first embodiment.
- FIG. 6 is an enlarged view showing a part of the reflection sheet in the first embodiment.
- FIG. 7 is a diagram schematically illustrating an example of the back plate in the first embodiment.
- FIG. 1 is a perspective view schematically showing an example of the appearance of the display device according to the first embodiment.
- FIG. 2 is an exploded perspective view schematically showing an example of the structure of the display device in
- FIG. 8 is a partial cross-sectional view schematically showing a configuration example in the concave portion of the back plate in the first embodiment.
- FIG. 9 is a schematic diagram for explaining the lifting of the reflective sheet from the mounting substrate in the comparative example.
- FIG. 10 is a schematic diagram for explaining the overlap between the reflection sheet and the mounting substrate in the first embodiment.
- each drawing is not necessarily illustrated strictly, and is a schematic diagram in which emphasis, omission, and ratio adjustment are appropriately performed to show the present disclosure, and the actual shape, positional relationship, ratio May be different.
- symbol is attached
- FIG. 1 is a perspective view schematically showing an example of the appearance of the display device 100 according to the first embodiment.
- FIG. 2 is an exploded perspective view schematically showing an example of the structure of the display device 100 according to the first embodiment.
- 1 and 2 schematically show a schematic configuration of the display device 100, and details are omitted.
- the X-axis, Y-axis, and Z-axis as necessary.
- the direction parallel (substantially parallel) to the longitudinal direction of the display device 100 is taken as the X axis
- the direction parallel (substantially parallel) to the lateral direction of the display device 100 is designated Y.
- a direction perpendicular to both the X axis and the Y axis is taken as the Z axis.
- the vertical direction with respect to the XZ plane, that is, the Y-axis direction is the direction of gravity
- the display device 100 is placed on an installation surface parallel (substantially parallel) to the XZ plane under normal use conditions. It shall be installed.
- the side facing the user (not shown) who views the display device 100 is “front” or “front”, the opposite side is “back”, and is relatively relative to the installation surface in the Y-axis direction.
- the far side is defined as “up”, and the direction relatively close to the installation surface in the Y axis direction is defined as “down”. Note that these directions are relative for convenience and are not absolute.
- the display device 100 includes a frame body 101, a front member 102, a display panel 103, a light emitting unit 140, a back plate 108, and a back cover 109.
- the display device 100 described in this embodiment is, for example, a television device that outputs video and audio obtained from received broadcast waves and the like, and includes a circuit board (not shown) and the like. Note that the configuration of the television device is substantially the same as a generally known configuration, and thus description thereof is omitted.
- the frame body 101, the front member 102, and the back cover 109 are members that cover the display panel 103, the light emitting unit 140, and the like.
- the frame body 101 is a member that protects the outer periphery of the display panel 103 and the like.
- the front member 102 is a transparent member that covers the front surface of the display panel 103.
- the back cover 109 is a member that protects the back surface of the display panel 103 and the like.
- the display panel 103 is a device that displays an image based on an input video signal.
- the images include still images, moving images, and the like, and characters and symbols are also included in the images.
- the display panel 103 described in this embodiment is a liquid crystal display panel. Further, the thickness of the display panel 103 is, for example, about 1 mm to 3 mm. In the present disclosure, the type of the display panel 103 is not particularly limited. The display panel 103 only needs to be light that transmits the display panel 103 when displaying an image.
- the light emitting unit 140 is a member for radiating light having substantially uniform brightness on the back surface of the display panel 103, and is generally called “backlight” or the like.
- the light emitting unit 140 includes the diffusion plate 104, the reflection sheet 105, and the light emitting module 106.
- FIG. 3 is a diagram schematically illustrating a configuration example of the light-emitting element 161 and the mounting substrate 162 that constitute the light-emitting module 106 according to the first embodiment.
- FIG. 4 is a diagram schematically illustrating an example of the relay substrate 163 that constitutes the light emitting module 106 according to the first embodiment.
- the light emitting module 106 has a long shape (Y-axis direction) arranged along the longitudinal direction (X-axis direction) and the short-side direction (Y-axis direction) of the display panel 103.
- the mounting substrate 162 is a member used for facilitating the arrangement of the light emitting elements 161 with respect to the back plate 108.
- a plurality of light emitting elements 161 are arranged on each mounting substrate 162 along the longitudinal direction (Y-axis direction) of the mounting substrate 162.
- each mounting substrate 162 is mounted in a matrix on the display panel 103 as shown in FIG. 3, so that the plurality of light emitting elements 161 are arranged in the longitudinal direction (X-axis direction) and the short side of the display panel 103. Arranged in a matrix along each direction (Y-axis direction).
- the mounting substrate 162 includes a contact 162a that is electrically connected to the relay substrate 163, and a conductive member (not shown) that electrically connects the contact 162a and each light emitting element 161 to each other.
- the conductive member is, for example, a printed wiring.
- electric power is supplied to each light emitting element 161 from the relay substrate 163 electrically connected to the contact 162a. Thereby, each light emitting element 161 attached to the mounting substrate 162 is turned on.
- a plurality of light emitting elements 161 are arranged in a line in the longitudinal direction of the mounting substrate 162 on the mounting substrate 162.
- the mounting substrate 162 is composed of a long flexible wiring substrate having a thickness of 0.01 mm to 0.05 mm, for example.
- the mounting substrate 162 is attached to the back plate 108 with an adhesive member (for example, a double-sided tape).
- the flexible wiring board is a board in which an electric circuit is provided on a base material formed by laminating a thin and soft base film having insulation properties such as polyimide and a conductive metal such as copper foil.
- the adhesive member may be an adhesive or the like.
- Each mounting substrate 162 is placed on the back plate 108 with the placement position set so that the end including the contact 162a is placed in a recess 1081 (see FIG. 7) of the back plate 108 described later. Then, the back surface of the end portion including the contact 162a of the mounting substrate 162 is attached to the recess 1081 with, for example, a double-sided tape.
- each mounting substrate 162 a layer having a higher light reflectance than the main body of the mounting substrate 162 is provided on the surface of the surface on which the light emitting elements 161 are arranged among the plurality of surfaces of the mounting substrate 162. ing.
- a white solder resist is applied to the surface of the mounting substrate 162 (the surface on which the light emitting elements 161 are arranged), so that the light reflectance is 95% or more as a layer having a high light reflectance ( A white resist film 162b (of a high reflection type) is formed.
- the light reflectance of the resist film 162b may be 99.9%, for example. Note that the light reflectance of a generally known white resist film is about 90%.
- each mounting substrate 162 is placed along the longitudinal direction (X-axis direction) and the short-side direction (Y-axis direction) of the display panel 103, whereby a plurality of light emitting elements 161 are displayed.
- the panels 103 are arranged in a matrix along each of the longitudinal direction (X-axis direction) and the lateral direction (Y-axis direction).
- the type of the light emitting element 161 is not particularly limited.
- a white LED that emits white light may be used as the light emitting element 161.
- the white LED can be realized, for example, by combining a blue light emitting diode and a fluorescent material that emits yellow light.
- the relay substrate 163 is formed of a long printed wiring board (long in the X-axis direction).
- the relay substrate 163 is a substrate used for supplying power to the light emitting element 161.
- the relay substrate 163 is placed in a recess 1081 (see FIG. 7) provided on the back plate 108 so that the end of the mounting substrate 162 (the end including the contact 162a) is sandwiched between the back plate 108 and the relay substrate 163. Is done.
- the relay substrate 163 comes into contact with the end portion (end portion including the contact point 162a) of the mounting substrate 162 disposed in the recess 1081, and is electrically connected to the contact point 162a of the mounting substrate 162. That is, the relay substrate 163 is placed in the recess 1081 so as to contact an end including the contact 162a of the mounting substrate 162, and physically contacts the contact 162a of the mounting substrate 162, thereby electrically connecting the contact 162a. Connected.
- the relay substrate 163 is formed of a long rigid substrate having a thickness of about 0.08 mm to 1.0 mm, for example.
- the relay substrate 163 is provided with a wiring for supplying power to the light emitting element 161 through the contact 162a of the mounting substrate 162 on the surface in contact with the mounting substrate 162 (surface in the negative Z-axis direction).
- the relay board 163 is provided with a through hole 1631 for fixing the relay board 163 to the back plate 108 with a screw or the like.
- the relay substrate 163 may be a flexible wiring substrate.
- the recess 1081 is not necessarily provided in the back plate 108, and the through hole 1631 is not necessarily provided in the relay substrate 163.
- the diffusion plate 104 is a member that diffuses the light emitted from each light emitting element 161.
- the diffusion plate 104 is a plate-like transparent member having fine irregularities on both sides or only one side of the diffusion plate 104.
- the diffusion plate 104 diffuses light incident from the back side of the diffusion plate 104 in substantially all directions from the front side of the diffusion plate 104 and emits the light. Thereby, the diffusion plate 104 reduces the viewing angle dependency of the luminance of the light emitted from the light emitting unit 140 (the luminance of the light reaching the user changes depending on the angle at which the user views the display device 100), and the light emitting unit The luminance of the light emitted from 140 is substantially uniformed.
- the configuration of the diffusion plate 104 is not limited to the above configuration example.
- the diffusion plate 104 may be arranged with fine particles having high light reflectance dispersed therein.
- the diffusing plate 104 may be a film in which a plurality of films having fine irregularities are overlapped.
- FIG. 5 is a diagram schematically illustrating an example of the reflection sheet 105 according to the first embodiment.
- FIG. 5 shows the reflection sheet 105 before being attached to the back plate 108.
- FIG. 6 is an enlarged view showing a part of the reflection sheet 105 in the first embodiment.
- a part of the reflection sheet 105 after being attached to the back plate 108 is shown enlarged. Note that FIG. 6 shows a region a surrounded by a broken line in FIG.
- the reflective sheet 105 has a plurality of holes 151.
- the reflection sheet 105 is attached to the back plate 108 so that the light emitting element 161 of the light emitting module 106 disposed on the back side of the reflection sheet 105 passes through the hole 151 and is exposed to the front side of the reflection sheet 105.
- the reflection sheet 105 reflects light traveling in the back direction (Z-axis negative direction) out of the light emitted from the light emitting element 161 toward the display panel 103 (on the Z-axis positive direction side).
- the material for forming the reflection sheet 105 is not particularly limited.
- a sheet-like member formed of a synthetic resin such as white PET (polyethylene terephthalate) having excellent light reflectivity is used for the reflection sheet 105. it can.
- the reflective sheet 105 includes a plurality of (for example, light emitting elements) for penetrating the light emitting elements 161 at positions corresponding to the light emitting elements 161 of the mounting substrate 162 disposed on the back plate 108. Holes 151 as many as 161). Specifically, the reflecting sheet 105 is provided with holes 151 larger than the outer shape of the light emitting element 161 at positions corresponding to the respective light emitting elements 161 of the mounting substrate 162 disposed on the back plate 108. Then, when the reflection sheet 105 is attached to the back plate 108, the light emitting element 161 is inserted into the hole 151.
- each drawing shows an example in which the hole 151 is formed in a square shape, the hole 151 may be formed in a shape other than a square such as a circle.
- a white resist film 162b having a light reflectance of 95% or more (high reflection type) is formed on the mounting substrate 162. Therefore, even if a part of the surface of the mounting substrate 162 (the resist film 162b around the light emitting element 161) is exposed from the hole 151, the resist film 162b can reflect the light of the light emitting element 161 with a relatively high light reflectance. . Thereby, in this Embodiment, the magnitude
- the size of the hole 151 in the top view is the size in the top view of the light emitting element 161. Is set to 10 mm to 15 mm square (that is, 9 times or more of the outer shape of the light emitting element 161 (size when viewed from above)). Therefore, in this embodiment, the light emitting element 161 is exposed from the hole 151 of the reflective sheet 105 and a part of the white resist film 162b applied to the mounting substrate 162 (the resist film 162b around the light emitting element 161). ) Is exposed.
- the light reflectance of the white resist film formed on the mounting substrate 162 is less than 95% (that is, a non-high reflection type resist film is formed on the mounting substrate 162). Or a case where the white resist film 162b is not formed on the mounting substrate 162.
- the surface of the mounting substrate 162 can reflect the light of the light emitting element 161 only with a relatively low light reflectance. Therefore, in order to suppress optical loss caused by the surface of the mounting substrate 162 having a relatively low light reflectance being exposed from the hole 151, the surface of the mounting substrate 162 around the light emitting element 161 is not exposed as much as possible from the hole 151.
- the hole 151 it is necessary to form the hole 151 in the same size as the outer shape of the light emitting element 161.
- the hole 151 is formed with a 1 mm to 3 mm square that is approximately the same as the outer shape of the light emitting element 161, thereby It is possible to prevent the surface of the mounting substrate 162 around the light emitting element 161 from being exposed.
- the edge of the hole 151 is touched or rubbed against the light emitting element 161, so that the edge of the hole 151 is rolled up and floats on the reflection sheet 105 (the lift from the mounting substrate 162. ) May occur. Then, when such a lift occurs, the light of the light emitting element 161 may enter the gap due to the lift and an optical loss may occur.
- the hole 151 sufficiently larger than the outer shape of the light emitting element 161, it becomes easy to insert the light emitting element 161 into the hole 151, and the occurrence of such lifting can be prevented.
- the surface of the mounting substrate 162 having a relatively low light reflectance is exposed from the hole 151 of the reflection sheet 105. Therefore, in order to suppress the optical loss in such a case, for example, a surface of the mounting substrate 162 exposed from the hole 151 by sticking a small piece of the reflection sheet to the mounting substrate 162 so as to surround the light emitting element 161. Must be covered with a small piece of reflective sheet.
- the white resist film 162b having a relatively high light reflectance (95% or more) is formed on the surface of the mounting substrate 162, the surface of the mounting substrate 162 is exposed from the hole 151.
- the exposed area may not be covered with a small piece of the reflective sheet. That is, in the reflection sheet 105, the size of the hole 151 can be made larger than the outer shape of the light emitting element 161, and a margin can be provided.
- the reflection sheet 105 is fixed by being attached to the back plate 108 with a double-sided tape or the like.
- the end portion of the hole 151 and the mounting substrate The end of 162 overlaps (not shown). That is, the reflective sheet 105 attached to the back plate 108 includes a region that overlaps the mounting substrate 162 and a region that contacts (or faces) the back plate 108 without overlapping the mounting substrate 162 when viewed from the front side. Occurs.
- the reflection sheet 105 may have flexibility (stretchability) that can bulge (deform) by being partially extruded.
- the mounting substrate 162 is formed of a long and relatively thin flexible wiring substrate (for example, having a thickness of 0.01 mm to 0.05 mm). Further, the size of the hole 151 is larger than the outer shape of the light emitting element 161, and there is a margin. Therefore, when the reflective sheet 105 is attached to the back plate 108, the region of the reflective sheet 105 that overlaps the mounting substrate 162 is slightly pushed out to the front side, but does not bulge (deform). For comparison with the present embodiment, it is assumed that the thickness of the mounting substrate 162 is relatively large.
- the reflection sheet 105 may float on the edge of the hole 151 (lift from the mounting substrate 162). Such floating may cause the optical loss as described above.
- it is necessary to suppress the lift by, for example, attaching a small piece of the reflection sheet to the reflection sheet 105 and the surface of the mounting substrate 162 across the edge of the hole 151.
- the mounting board 162 is formed of a flexible wiring board as described above, when the reflecting sheet 105 is attached to the back plate 108 with a double-sided tape or the like, the mounting board in the reflecting sheet 105 is used. The floating from the mounting substrate 162 in the region overlapping the 162 is suppressed. Therefore, it is not necessary to use a small piece or the like of the reflection sheet for suppressing the lifting of the reflection sheet 105 as described above.
- FIG. 7 is a diagram schematically showing an example of back plate 108 in the first exemplary embodiment.
- FIG. 7 shows the back plate 108 before the light emitting unit 140 is attached.
- FIG. 8 is a partial cross-sectional view schematically showing a configuration example in the concave portion 1081 of the back plate 108 in the first embodiment.
- summary in the recessed part 1081 after the light emission unit 140 is attached is shown.
- the back plate 108 is a plate-like member that holds the display panel 103. As shown in FIG. 2, the back plate 108 is disposed on the back surface (the surface on the Z-axis negative direction side) of the display panel 103. The back plate 108 holds the light emitting unit 140 between the display panel 103 and the back plate 108, and holds a circuit board (not shown) or the like on the back of the back plate 108.
- the back plate 108 is formed using, for example, a metal plate generally called “chassis”. Further, the back plate 108 is provided with irregularities by press working or the like in order to improve the structural strength.
- the back plate 108 includes a recess 1081 and a hole 1082.
- the recess 1081 is provided in a long shape in the longitudinal direction (X-axis direction) of the back plate 108.
- the relay substrate 163 and one end portion of the mounting substrate 162 are placed in the recess 1081.
- the depth of the recess 1081 (the size in the Z-axis direction) is set to be substantially the same as the thickness of the relay substrate 163 plus the thickness of the mounting substrate 162, for example.
- the mounting substrate 162 is attached to the back plate 108 with a double-sided tape 107 as shown in FIG.
- one end portion (an end portion including the contact 162a) of the mounting substrate 162 is attached to the back plate 108 by the double-sided tape 107 also in the recess 1081. In this way, one end of the mounting substrate 162 is placed in the recess 1081.
- the hole 1082 is used to electrically connect a circuit board (not shown) or the like held on the back surface of the back plate 108 to the relay board 163 (for example, to pass electrical wiring or the like).
- the back plate 108 may be disposed so as to cover the entire back surface (or almost the entire surface) of the display panel 103, and may have a function of radiating heat generated in the display panel 103.
- the display device includes a display panel that displays an image, a plurality of long mounting boards that are arranged along the display panel, and a longitudinal direction of each of the mounting boards.
- a plurality of arranged light emitting elements that radiate light from the back side of the display panel toward the display panel, arranged in a matrix along the display panel, and a back plate on which a plurality of mounting substrates are attached by an adhesive member;
- a reflective sheet that is attached to the back plate, has a hole through which the light emitting element penetrates at a position corresponding to the light emitting element, and reflects light emitted from the light emitting element toward the display panel.
- Each of the plurality of mounting boards is configured by a flexible wiring board.
- the display device 100 is an example of a display device.
- the display panel 103 is an example of a display panel.
- the mounting substrate 162 is an example of a mounting substrate.
- the light emitting element 161 is an example of a light emitting element.
- the double-sided tape 107 is an example of an adhesive member.
- the back plate 108 is an example of a back plate.
- the hole 151 is an example of a hole through which the light emitting element passes.
- the reflection sheet 105 is an example of a reflection sheet.
- the display device 100 described in Embodiment 1 includes a display panel 103 that displays an image, a plurality of long mounting boards 162 that are arranged along the display panel 103, and each of the mounting boards 162.
- a reflective sheet 105 that reflects the light.
- Each of the plurality of mounting boards 162 is composed of a flexible wiring board.
- the thickness of the flexible wiring board may be 0.01 mm to 0.05 mm.
- the mounting substrate 162 is configured by a long and relatively thin flexible wiring substrate
- the mounting substrate is configured by a long rigid substrate having a thickness of about 1 mm.
- the thermal resistance of the mounting substrate 162 can be significantly reduced.
- the mounting substrate 162 can be attached to the back plate 108 with double-sided tape or the like without providing the back plate 108 with a recess for mounting the mounting substrate 162. it can. Further, the floating of the reflection sheet 105 can be suppressed. Thereby, in the display apparatus 100, the optical loss by the floating of the reflection sheet 105 can be suppressed. This effect will be described with reference to FIGS.
- FIG. 9 is a schematic diagram for explaining the lifting of the reflective sheet 105 from the mounting substrate 562 in the comparative example.
- FIG. 10 is a schematic diagram for explaining the overlap between the reflection sheet 105 and the mounting substrate 162 in the first embodiment.
- the comparative example shown in FIG. 9 shows an example in which the mounting substrate 562 is formed of a long rigid substrate having a thickness of 1 mm.
- a recess for mounting the mounting substrate 562 is provided on the back plate 508. This recess is provided to suppress the reflection sheet 105 from being lifted up. If this recess is not provided, the reflection sheet 105 may be lifted depending on the thickness of the mounting substrate 562 as described above.
- the recess is set to a depth (size in the Z-axis direction) corresponding to the thickness of the mounting substrate 562, and is formed, for example, on the back plate 508 by pressing or the like. However, it is difficult to form the concave portion with high accuracy by press working.
- the mounting substrate 562 protrudes from the recess to the front side (Z-axis positive direction side), and the reflection sheet 105 may be lifted as described above. is there.
- the depth of the recess is deeper than the set value, as shown in FIG. 9, when the mounting substrate 562 is attached to the recess with the double-sided tape 107 and placed, the surface of the mounting substrate 562 There is a possibility that a gap is generated between the reflection sheet 105 and the reflection sheet 105 is lifted. Then, when those lifts occur in the reflective sheet 105, the light of the light emitting elements 161 arranged on the mounting substrate 562 may enter the gap generated by the lift, and optical loss may occur.
- the mounting substrate 162 is formed of a relatively thin flexible wiring substrate (for example, having a thickness of 0.01 mm to 0.05 mm). Therefore, it is not necessary to provide the back plate 108 with a recess as shown in FIG. 9 for mounting the mounting substrate 162, and the process and cost required for manufacturing the display device 100 can be suppressed. Further, even if the concave portion as shown in FIG. 9 is not provided in the back plate 108, the reflection sheet 105 is suppressed from being lifted, and the mounting substrate 162 is directly attached to the back plate 108 by the double-sided tape 107 (that is, , Without providing a recess).
- the mounting substrate 162 pushes a part of the vicinity of the hole 151 in the reflection sheet 105 to the front side (Z-axis positive direction side) depending on the thickness of the mounting substrate 162 (that is, the hole 151 of the reflection sheet 105).
- the mounting substrate 162 has a thickness of only about 0.01 mm to 0.05 mm, for example, and is relatively thin. Therefore, even if the reflection sheet 105 is lifted, the lift is substantially reduced. It can be kept as small as possible without causing general problems.
- the mounting substrate 162 is configured as described above, so that the reflection sheet 105 is prevented from being lifted and optical loss due to the reflection sheet 105 being lifted is reduced. Is possible.
- a surface on which a plurality of light emitting elements are arranged among a plurality of surfaces of the mounting substrate may be coated with a white solder resist having a light reflectance of 95% or more.
- the size of the hole in the top view may be 10 mm to 15 mm when the size of the light emitting element in the top view is 1 mm to 3 mm square.
- the resist film 162b is an example of a film formed by applying a white solder resist having a reflectance of 95% or more.
- a surface on which a plurality of light emitting elements 161 are arranged among a plurality of surfaces of the mounting substrate 162 is coated with a white solder resist having a light reflectance of 95% or more to form a resist film 162b.
- the size of the hole 151 in the top view is 10 mm to 15 mm square when the size of the light emitting element 161 in the top view is 1 mm to 3 mm square.
- the size of the hole 151 provided in the reflection sheet 105 is significantly larger than the outer shape of the light emitting element 161. Therefore, a region where the mounting substrate 162 and the reflection sheet 105 overlap each other can be reduced. Thereby, since the floating of the reflective sheet 105 can be further suppressed, the optical loss due to the floating of the reflective sheet 105 can be reduced.
- the reflective sheet may be attached to the back plate with an adhesive member. Further, the end of the hole and the end of the mounting substrate may overlap each other when viewed from above.
- the reflection sheet 105 may be attached to the back plate 108 with the double-sided tape 107, and the end of the hole 151 and the end of the mounting substrate 162 may overlap when viewed from above.
- the double-sided tape 107 for fixing the mounting substrate 162 can be used together for fixing the reflection sheet 105.
- the display device in this embodiment may further include a long relay substrate for supplying power to the light emitting element.
- the back plate may be provided with a recess that is recessed toward the surface opposite to the surface on the surface to which the mounting substrate is attached, in a direction perpendicular to the longitudinal direction of the mounting substrate. Then, the relay substrate may be electrically connected to the mounting substrate by being placed in the recess and being placed on the end portion of the mounting substrate positioned in the recess.
- the relay board 163 is an example of a relay board.
- the recess 1081 is an example of a recess.
- the display device 100 of this embodiment further includes a long relay substrate 163 for supplying power to the light emitting element 161.
- a recess 1081 that is recessed toward the surface opposite to the surface on which the mounting substrate 162 is attached is provided in a direction perpendicular to the longitudinal direction of the mounting substrate 162.
- the relay substrate 163 is placed in the recess 1081 and is placed on the end portion of the mounting substrate 162 located in the recess 1081, thereby being electrically connected to the mounting substrate 162.
- the display device 100 can place the relay substrate 163 in the recess 1081 by providing the back plate 108 with the recess 1081. Further, since the mounting substrate 162 is formed of a flexible wiring substrate having flexibility, the end portion (the end portion including the contact 162a) of the mounting substrate 162 is deformed along the shape of the recess portion 1081 to be in the recess portion 1081. Can be placed. Thereby, in the display device 100, since the electrical connection portion between the relay board 163 and the mounting board 162 can be disposed in the recess 1081, the relay board 163 that supplies power to the mounting board 162 does not push up the reflection sheet 105. Can be realized. Therefore, in the display device 100, the reflection sheet 105 is less likely to be bent, and the reflected light spots caused by the reflection sheet 105 can be reduced.
- the present disclosure is applicable to a display device that displays an image, characters, a moving image, or the like using a backlight.
- the present disclosure is applicable to electronic devices such as a television device, a monitor, a digital signage, a mobile terminal, a tablet terminal, or a table display device.
Abstract
Description
[1-1.表示装置の構成の概要]
図1は、実施の形態1における表示装置100の外観の一例を模式的に示す斜視図である。
図3は、実施の形態1における発光モジュール106を構成する発光素子161と実装基板162との一構成例を模式的に示す図である。
実装基板162は、背面板108に対する発光素子161の配置を容易にするために用いられる部材である。各実装基板162には、実装基板162の長手方向(Y軸方向)に沿って複数の発光素子161が配列されている。そして、各実装基板162が、図3に示すように表示パネル103に対してマトリクス状に載置されることで、複数の発光素子161が表示パネル103の長手方向(X軸方向)および短手方向(Y軸方向)のそれぞれに沿ってマトリクス状に配置される。
上述したように、発光素子161は、実装基板162のそれぞれに、各実装基板162の長手方向(Y軸方向)に沿って複数配列されている。そして、各発光素子161は、表示パネル103の背面側から表示パネル103に向かって光を放射する。表示装置100においては、各実装基板162が表示パネル103の長手方向(X軸方向)および短手方向(Y軸方向)のそれぞれに沿って載置されることにより、複数の発光素子161が表示パネル103の長手方向(X軸方向)および短手方向(Y軸方向)のそれぞれに沿ってマトリクス状に配置される。
中継基板163は、例えば図4に示すように、長尺状(X軸方向に長尺状)のプリント配線基板で構成される。中継基板163は、発光素子161に電力を供給するために用いられる基板である。中継基板163は、背面板108に設けられた凹部1081(図7参照)に、実装基板162の端部(接点162aを含む端部)を背面板108との間に挟み込むようにして、載置される。これにより、中継基板163は、凹部1081に配置された実装基板162の端部(接点162aを含む端部)に接触して、実装基板162の接点162aと電気的に接続される。すなわち、中継基板163は、実装基板162の接点162aを含む端部に接触するように凹部1081に載置され、実装基板162の接点162aと物理的に接触することで、接点162aと電気的に接続される。
拡散板104は、各発光素子161から放射される光を拡散する部材である。例えば、拡散板104は、拡散板104の両面または片面のみに細かな凹凸を有する板状の透明な部材である。例えば、拡散板104は、拡散板104の背面側から入射した光を、拡散板104の前面側から実質的に全方位に拡散して出射する。これにより、拡散板104は、発光ユニット140から出射される光の輝度の視角依存性(ユーザが表示装置100を視る角度によってユーザに届く光の輝度が変化すること)を低減させ、発光ユニット140から出射される光の輝度を実質的に均一化する。
図5は、実施の形態1における反射シート105の一例を模式的に示す図である。図5には、背面板108に取り付ける前の反射シート105を示す。
図7は、実施の形態1における背面板108の一例を模式的に示す図である。図7には、発光ユニット140が取り付けられる前の背面板108を示す。
以上のように、本実施の形態において、表示装置は、画像を表示する表示パネルと、表示パネルに沿って配置される、長尺状の複数の実装基板と、実装基板のそれぞれの長手方向に複数配列され、表示パネルの背面側から表示パネルに向かって光を放射し、表示パネルに沿ってマトリクス状に配置される発光素子と、複数の実装基板が接着部材により貼り付けられる背面板と、背面板に取り付けられ、発光素子に対応する位置に発光素子が貫通する穴を有し、発光素子から放射された光を表示パネルに向かって反射する反射シートと、を備える。そして、複数の実装基板のそれぞれは、フレキシブル配線基板で構成される。
以上のように、本開示における技術の例示として、実施の形態1を説明した。そのために、添付図面および詳細な説明を提供した。
101 枠体
102 前面部材
103 表示パネル
104 拡散板
105 反射シート
106 発光モジュール
107 両面テープ
108,508 背面板
109 背面カバー
140 発光ユニット
151,1082 穴
161 発光素子
162,562 実装基板
162a 接点
162b レジスト膜
163 中継基板
1081 凹部
1631 貫通孔
Claims (6)
- 画像を表示する表示パネルと、
前記表示パネルに沿って配置される、長尺状の複数の実装基板と、
前記実装基板のそれぞれの長手方向に複数配列され、前記表示パネルの背面側から前記表示パネルに向かって光を放射し、前記表示パネルに沿ってマトリクス状に配置される発光素子と、
前記複数の実装基板が接着部材により貼り付けられる背面板と、
前記背面板に取り付けられ、前記発光素子に対応する位置に前記発光素子が貫通する穴を有し、前記発光素子から放射された光を前記表示パネルに向かって反射する反射シートと、を備え、
前記複数の実装基板のそれぞれは、フレキシブル配線基板で構成される、
表示装置。 - 前記フレキシブル配線基板の厚みは、0.01mm~0.05mmである、
請求項1に記載の表示装置。 - 前記実装基板が有する複数の面のうち前記発光素子が複数配列された面は、光反射率が95%以上の白色ソルダーレジストが塗布されている、
請求項1に記載の表示装置。 - 前記穴の上面視における大きさは、前記発光素子の上面視における大きさが1mm~3mm角である場合、10mm~15mm角である、
請求項3に記載の表示装置。 - 前記反射シートは、
前記接着部材により前記背面板に貼り付けられ、上面視したときの前記穴の端部と前記実装基板の端部とが重なっている、
請求項1に記載の表示装置。 - 前記発光素子に電力を供給するための長尺状の中継基板をさらに備え、
前記背面板は、前記実装基板が貼り付けられる面に、当該面とは反対側の面に向かって窪んだ凹部が、前記実装基板の長手方向に垂直な方向に設けられており、
前記中継基板は、前記凹部に載置され、かつ、前記凹部に位置する前記実装基板の端部に載置されることにより、前記実装基板と電気的に接続される、
請求項1に記載の表示装置。
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EP17773810.1A EP3438521B1 (en) | 2016-03-30 | 2017-02-17 | Display device |
JP2018508564A JP6827183B2 (ja) | 2016-03-30 | 2017-02-17 | 表示装置 |
US16/086,403 US10580346B2 (en) | 2016-03-30 | 2017-02-17 | Display device including a plurality of flexible LED mounting boards |
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JP2016069707 | 2016-03-30 | ||
JP2016-069707 | 2016-03-30 |
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US (1) | US10580346B2 (ja) |
EP (1) | EP3438521B1 (ja) |
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Cited By (2)
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JP2020085977A (ja) * | 2018-11-17 | 2020-06-04 | アルパイン株式会社 | 表示装置 |
JP2022524241A (ja) * | 2019-05-23 | 2022-04-28 | シグニファイ ホールディング ビー ヴィ | 固体光源用途用の安定したpcb |
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US20190103050A1 (en) | 2019-04-04 |
JP6827183B2 (ja) | 2021-02-10 |
JPWO2017169262A1 (ja) | 2019-02-07 |
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EP3438521A4 (en) | 2019-06-19 |
US10580346B2 (en) | 2020-03-03 |
EP3438521B1 (en) | 2022-01-12 |
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