KR200485851Y1 - Planar light emitting device - Google Patents

Planar light emitting device Download PDF

Info

Publication number
KR200485851Y1
KR200485851Y1 KR2020150005760U KR20150005760U KR200485851Y1 KR 200485851 Y1 KR200485851 Y1 KR 200485851Y1 KR 2020150005760 U KR2020150005760 U KR 2020150005760U KR 20150005760 U KR20150005760 U KR 20150005760U KR 200485851 Y1 KR200485851 Y1 KR 200485851Y1
Authority
KR
South Korea
Prior art keywords
light
flexible sheet
light guide
display panel
exposed
Prior art date
Application number
KR2020150005760U
Other languages
Korean (ko)
Other versions
KR20160000915U (en
Inventor
지아 쉬
카이민 첸
Original Assignee
알프스 덴키 가부시키가이샤
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 알프스 덴키 가부시키가이샤 filed Critical 알프스 덴키 가부시키가이샤
Publication of KR20160000915U publication Critical patent/KR20160000915U/en
Application granted granted Critical
Publication of KR200485851Y1 publication Critical patent/KR200485851Y1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • 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
    • G02F2001/133325—

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

The present invention relates to an area light emitting device which is thin and can prevent leakage of light from a rear surface or a side surface of a light guide plate. The surface light emitting device includes a flat panel display panel, a flexible sheet having a light reflection function and a light shielding function, a flat light guide portion disposed between the display panel and the flexible sheet, and a light source arranged on the side of the light guide portion Wherein the flexible sheet has an adhesive material on at least a part of one surface of the flexible sheet having the light reflection function and the adhesive material adheres to the one surface having the light reflection function by the adhesive material, The flexible sheet has an exposed portion exposed in the periphery of the light guide portion other than the adjacent side, and the display panel and the flexible sheet are adhered by the adhesive material on the exposed portion.

Description

[0001] PLANAR LIGHT EMITTING DEVICE [0002]

Field of the Invention [0002] The present invention relates to an area light emitting device, and more particularly, to an area light emitting device that emits an operating area of an electronic device such as a cellular phone.

Background Art [0002] Conventionally, a light guide sheet disposed between a display panel and a backlight plate has been developed to light an operation area of an electronic device such as a cellular phone.

Patent Document 1 discloses a light emitting unit. 1 and 2, the base body 11 has an operation region and the base body 11 is provided with the contact sheet 12 and the light guide sheet 13 in sequence. Light from the light emitting diode 141 in the light source unit 14 is incident on the end face B of the light guide sheet 13 and is guided into the light guide sheet and diffused in the light emitting area provided on the main surface A of the light guide sheet , And exits to the outside. A cover member 15 (including a reflective layer 151 and an absorbent layer 152) that covers a gap between the light source unit 14 and the end surface B of the light guide sheet 13 is formed in the light emitting unit, The light emitted from the gap or the upper surface of the light source is reflected by the cover member 15 and guided into the light guide sheet 13 so that the light from the light source unit 14 is efficiently guided to the light guide sheet.

CN101230970B

However, in the light emitting unit having the above structure, light leakage from the upper surface side of the light source can be prevented by reflecting or absorbing the light emitted from the gap or the upper surface of the light source by the cover member. However, It is not possible to prevent the light from being emitted from the upper surface of the sheet and from one side of the other side (that is, the side opposite to the side surface B). Conventionally, in order to prevent light leakage from the upper surface and the other side surface of the light guide sheet, it is necessary to separately provide a light shielding member around the light guide sheet.

On the other hand, as the development of the OGS (One Glass Solution) technology and the thinning of the electronic apparatus become smaller, the gap between the display panel and the component mounting substrate becomes smaller and smaller, for example, the gap becomes about 0.2 mm to about 0.1 mm . On the other hand, the thickness of the light guide sheet is required to be thin. As the thickness of the light guide sheet becomes thinner, the light emitting center of the light source and the center of thickness of the light guide sheet are largely displaced, resulting in a problem that the light utilization rate is lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a planar light emitting device which is thin and can prevent leakage of light from a back surface or a side surface of a light guide plate.

The area light emitting device includes a flat panel display panel, a flexible sheet having a light reflecting function and a light shielding function, a flat light guide part disposed between the display panel and the flexible sheet, Wherein the flexible sheet has an adhesive material on at least a part of one surface of the flexible sheet having the light reflection function and the adhesive material adheres the light guide portion to one surface having the light reflection function by the adhesive material, And the flexible sheet has an exposed portion exposed at the periphery of the light guide portion other than the side adjacent to the light source, and the display panel and the flexible sheet are adhered by the adhesive material on the exposed portion.

The flexible sheet is provided with the flexible sheet by the surface light emitting device. The light guide portion is adhered to one surface of the flexible sheet with an adhesive material. The back surface of the light guide portion is covered with the adhesive material and the back surface and the side surface The display panel and the flexible sheet are adhered to each other so as to seal the side surface (at least one side surface on three sides other than the side). Therefore, it is not necessary to provide another light shielding gun on the back surface or the side surface of the backlight plate, thereby realizing thinning, and realizing cost reduction by reducing members and assembling steps.

In the area light emitting device, a plurality of light guide portions are disposed between the display panel and the flexible sheet, and adjacent light guide portions are connected to the connection portion.

The connection of the plurality of light guide portions by the connecting portion can assure the placement accuracy of the entire light guide portions, thereby making it difficult for the positional shift to occur.

In the area light emitting device, the connecting portion is narrower than the light guiding portion in the width direction perpendicular to the connecting direction.

The area exposed from the periphery of the light guide portion of the flexible sheet becomes larger, that is, the area of adhesion between the flexible sheet and the display panel becomes larger because the width of the connection portion is narrower than that of the light guide portion. Therefore, more reliable adhesion can be realized, and the degree of fixation of the light guide portion can be realized more reliably.

In the area light emitting device, a height adjusting adhesive material is formed between the display panel and the light guide portion so that the light emitting center of the light source approaches or coincides with the center in the thickness direction of the light guide portion in the thickness direction.

The inclination of the light from the light source can be improved at the incident end of the light guiding portion by installing the height adjusting adhesive material and the use rate of light can be improved because the thickness of the light emitting portion of the light guiding portion can be assured.

In the area light emitting device, the height difference between the light emitting center of the light source and the center of the light guide in the thickness direction is preferably not more than 1/4 of the size in the thickness direction of the light emitting element of the light source. In this case, a higher utilization rate of light can be obtained.

In the area light emitting device, the flexible sheet has a light reflection layer and a light shielding layer, and the light reflection layer is a metal color such as white or a metal deposition film, and the light shielding layer is black.

The light shielding layer and the light reflection layer are formed as a single member and can absorb light that is not reflected by the light reflection layer, so that leakage of light through the light reflection layer can be reliably prevented.

In the area light emitting device, the exposed portion includes a first exposed portion exposed from the opposite side of the light source of the light guiding portion, and a second exposed portion exposed from the side of the light guiding portion.

It is possible to reliably prevent light from leaking from the opposite side and side of the light source of the light guide plate by the adhesive material of the first exposed portion and the second exposed portion.

In the area light emitting device, the length of the first exposed portion before tacking in the width direction perpendicular to the connecting direction exceeds 1.4 times the thickness of the light guiding portion. In this case, it can be ensured that the bend angle of the first exposed portion is not large, and a high adhesive strength to the display panel can be maintained.

1 is a plan view showing a conventional light emitting unit.
2 is a sectional side view showing a conventional light emitting unit.
3 is a schematic diagram showing an example of application of the area light emitting device of the present invention.
4 is a plan view showing the area light emitting device of the present invention.
5 is a cross-sectional view taken along line AA in Fig.
Fig. 6 is a plan view of a flat sheet, a light guide sheet, and a height adjusting adhesive material in a state of being disassembled in the area light emitting device of the present invention. Fig.
7 is a cross-sectional view showing an example of a flexible sheet.

The area light emitting device of the present invention emits an operation area in a display panel of an electronic device including a device such as a tablet, a mobile phone, and a vehicle device. It goes without saying that the present invention can be applied to a case where the display panel is provided with an operation region such as a key region and the operation region is made to emit light.

Fig. 3 shows an example in which the area light emitting device of the present invention is applied to a cellular phone.

In some smartphones, as shown in Fig. 3, an operation area 2 is formed below the display panel 1. Fig. In the operation area 2 in Fig. 3, three key areas are formed on the left, middle, and right sides, and different functions are assigned to each key area. The user performs specific operations such as selection, exit, and menu display by touching the key area in the display panel.

Hereinafter, the configuration of the area light emitting device 3 of the present invention will be described with reference to Figs. 3 to 7. Fig.

3 is a plan view when the display panel is viewed from the back side (the opposite side of the side on which the user operates) of the display panel. Fig. 4 is an enlarged view of a portion surrounded by a broken line in Fig. 3. Fig. 5 is a cross-sectional view taken along the line A-A in Fig. Fig. 6 is a plan view when the flexible sheet, light guide sheet and height-adjusting adhesive material in the area light emitting device 3 of the present invention are in a decomposed state. 7 is a cross-sectional view showing an example of a flexible sheet.

The upper, lower, left, and right directions in FIGS. 3 and 4 are set to the upper, lower, left, and right directions of the surface light emitting device 3, In the thickness direction of the light emitting device 3. The state of viewing in a plane is a state in which the back side of the display panel 1 is viewed from above when the back side of the display panel 1 is horizontally oriented upward.

The area light emitting device 3 includes a part of the flat panel display panel 1, a flexible sheet 4, a flat light guide portion 5, a connecting portion 6, a height adjusting adhesive material 7, And a light source 8.

4 and 5, the flexible sheet 4, the flat light guide portion 5, the connecting portion 6 and the height-adjusting adhesive material 7 are arranged in the thickness direction of the display panel 1 As shown in Fig. The light guide portion 5 is formed between the display panel 1 and the flexible sheet 4 in the thickness direction and the height adjusting adhesive material 7 is formed between the light guide portion 5 and the display panel 1 .

4, the light source 8 is formed below the light guide portion 5, and the light source 8 and the light guide portion 5 are provided with an interval. The light source 8 includes a flexible printed circuit board (FPC) 8a and a light emitting diode 8b. Electric power from the battery is supplied to the light emitting diode 8b using the wiring in the flexible printed circuit (FPC) 8a to emit the light emitting diode 8b.

The light guiding portion 5 is usually made of a material having flexibility, for example, plastic. Specifically, the light guiding portion is composed of a polyurethane resin, a PET (polyethylene terephthalate) resin, a PEN (polyethylene naphthalate) resin, a PC (polycarbonate) resin or the like.

4, when a plurality of light guide portions 5 are provided between the display panel 1 and the flexible sheet 4, the adjacent light guide portions 5 are connected to the connection portion 6. As shown in Fig. The arrangement accuracy of the entire light guiding portion 5 can be assured as compared with the case where the plurality of light guiding portions 5 are disposed by connecting the plurality of light guiding portions 5 by the connecting portion 6, It becomes difficult to occur. The connecting portion 6 is preferably made of the same material as the light guiding portion 5 and is integrally molded with the light guiding portion 5. [

The width of the connecting portion 6 (the length in the vertical direction in Fig. 4) is narrower than the light guiding portion 5 in the width direction perpendicular to the connecting direction.

The height-adjusting adhesive material 7 is made of a double-sided tape having a constant thickness. The incident end 5a on the light source side of the light guide portion 5 can be attached to the back surface side of the display panel 1 by the height adjusting adhesive material 7 as shown in Fig. 6, the height-adjusting adhesive material 7 is formed only on the incident end 5a side of the light guide portion 5 and has a shape overlapping the incident end 5a of the light guide portion 5 .

The constitution of the flexible sheet 4 is not particularly limited as long as it is a member having a light reflecting function and a light shielding function. The light-shielding layer 42 may be provided outside the light reflection layer 41 as shown in Fig. As the light reflection layer 41, a white resin layer and the like can be mentioned. As the light shielding layer 42, a black resin layer and the like can be mentioned. For the black resin layer, a black resin may be directly used, or black ink may be printed. Even when light passes through the light reflection layer 41, the light transmitted through the light shielding layer 42 can be absorbed, and leakage of light through the light reflection layer 41 can be reliably prevented.

The flexible sheet 4 has an adhesive material on one surface having a light reflecting function and the flexible sheet 4 is superimposed on the light guide portion 5 so that the one surface having the reflection function of the flexible sheet 4, Thereby adhering the part (5).

The flexible sheet 4 has exposed portions exposed around the light guide portion 5 and the connection portion 6, other than the side adjacent to the light source 8. [ That is, the flexible sheet 4 and the light guide portion 5 are superimposed on the side adjacent to the light source 8 and the flexible sheet 4 is provided on the side of the light guide 8 5 and the exposed portion exposed around the connection portion 6. [

4, the exposed portion of the light guiding portion 5 is exposed from the opposite side (the upper side in Fig. 4) of the light source 8 to the first exposed portion 4a and the side of the light guiding portion 5 And / or the second exposed portion 4b). And further includes a third exposed portion 4c exposed from upper and lower chambers of the connection portion 6. [

5, the first exposed portion 4a includes an inclined portion 4a1 inclined with respect to the display panel 1 and a parallel portion 4a2 parallel to the display panel 1. As shown in Fig. The bending angle of the inclined portion (4a1) is too large, the flexible sheet 4 is because the potential fold slope portion (4a1), the length (L) of not less than 1.4 times the thickness (h 1) of the light guide portion (5) (That is, 1.4 * h 1 ? L) is preferable. In this case, it can be ensured that the angle formed by the inclined portion 4a1 and the parallel portion 4a2 is 45 degrees or less. In other words, it is preferable that the length of the first exposed portion 4a in the up and down direction before adhesion is more than 1.4 times the thickness h 1 of the light guide portion 5.

The flexible sheet 4 covers the entire rear surface of the light guide portion 5 and is also attached to the back surface and the side surface of the light guide portion 5 (the side adjacent to the light source 8 in Fig. 4) The display panel 1 and the flexible sheet 4 are adhered to each other so that the display panel 1 and at least one side surface on the other three sides are sealed. Therefore, it is not necessary to provide another light shielding gun on the back surface or the side surface of the backlight plate (not shown), so that the thickness reduction can be realized and the cost can be reduced by reducing the member and the assembling process.

5, the distance between the flexible sheet 4 and the display panel 1 changes continuously in the vertical direction. The distance between the flexible sheet 4 and the display panel 1 is largest at the position where the flexible sheet 4 and the height-adjusting adhesive material 7 overlap each other in the thickness direction. Since the flexible sheet 4 and the display panel 1 are directly attached to the first exposed portion 4a of the flexible sheet 4, the distance becomes zero.

The light guiding portion 5 is formed in a shape corresponding to the key in the operation area, and is generally formed in a substantially rectangular shape. 5 and 6, a laser is irradiated to a region of the light emitting portion 5b of the light guide portion 5 at a portion where the light guide portion 5 contacts the display panel 1 to form a groove A substantially rectangular light emitting portion 5b is provided. It is needless to say that the method of forming the light emitting portion 5b is not limited to this.

Further, since the width of the connecting portion 6 is narrower than that of the light guide portion 5, the area exposed from the periphery of the light guide portion of the flexible sheet 4 becomes large, that is, the area of adhesion between the flexible sheet and the display panel becomes large. Therefore, more reliable adhesion can be realized, and the degree of fixation of the light guide portion can be more reliably realized.

Hereinafter, the function of the adhesive material 7 for adjusting the height will be described with reference to Fig.

The center of the light source 8 in the thickness direction (i.e., the light emitting center of the light emitting diode 8b) and the center in the thickness direction of the incident end of the light guiding portion 5 (hereinafter referred to as the thickness center) The closer the distance is, the higher the incidence is. The height adjusting adhesive material 7 is formed to reduce the difference in height between the light emitting center of the light source 8 and the center of thickness of the incident end of the light guide portion 5. The height adjustment adhesive material 7 need not be formed when the center of the light emitting portion of the light source 8 approaches or coincides with the thickness center of the light guide portion 5 when the height adjusting adhesive material 7 is not formed.

However, as the thickness of the electronic device is reduced, the gap between the display panel 1 and the backlight plate (not shown) is reduced to about 0.1 mm. At this time, the thickness h 1 of the light guide portion 5 is about 0.07 mm . When the thickness of the light source 8 is not particularly required, the thickness h 2 of the flexible printed circuit board (FPC) 8a is about 0.12 mm and the thickness h 3 of the light emitting diode 8b is about 0.3 Mm.

For example, when the thickness h 4 of the height-adjusting adhesive material 7 in Fig. 5 is about 0.1 mm, the height between the light-emitting center of the light source 8 to be reduced and the center of the thickness of the light- The difference (H)

H = (h 2 + h 3 /2) - is a (h 4 + h 1/2 ) = 0.135 ㎜.

Without providing the adjusting adhesive material 7 is high in FIG. 5, the thickness (h 4 ') is approximately 0.03 ㎜ a light emitting center and light guide of the light source 8 to the normal by employing the pressure-sensitive adhesive material, to be reduced portion 5 The difference (H '

H '= (h 2 + h 3/2) - (h 4' is a + h 1/2) = 0.205 ㎜.

Therefore, the incidence of the light from the light source 8 at the incident end of the light guide portion 5 can be improved by installing the adhesive material 7 for height adjustment, and the light incident portion of the light guide portion 5 5b can be guaranteed to be thin, the use rate of light is improved.

As the distance between the light emitting center of the light emitting diode 8b in the thickness direction and the center of thickness of the incident end of the light guiding portion 5 is higher, the incident rate becomes higher and the distance between the light emitting center of the light emitting diode 8b and the light guiding portion 5 ) godocha (h) of the center of the thickness of the is preferably 1/4 or less of the height (h 3) of a light emitting diode (8b) light emitting elements of the light source. That is, | - | is a ≤ h 3/4 (h 2 + h 3/2) (h 4 + h 1/2).

Therefore, the preferable range of the thickness h 4 of the pressure-sensitive adhesive material 7 for height-

h 2 + 3h 3/4 -h 1/2 ≤ h 4 ≤ h 2 + h 3/4 -h 1/2

.

(Modified example)

In the area light emitting device 3, three light guide portions 5 are disposed between the display panel 1 and the flexible sheet 4 and the adjacent light guide portions 5 are connected to the connection portion 6 The light guiding portion 5, and the connecting portion 6 is not limited to this. When at least one light guiding portion 5 is present, the present invention can be used. It is apparent that it is not necessary to form the connecting portion 6 when only one light guide portion 5 is formed between the display panel 1 and the flexible sheet 4. [

In the surface light emitting device 3, an adhesive material may be provided on the entire surface having the light reflecting function of the flexible sheet 4, or the adhesive material may be provided on a part of one surface having the light reflecting function of the flexible sheet do. For example, the adhesive material may be provided only at a position corresponding to the vicinity of the center of the light guide portion 5 at a portion overlapping the light guide portion 5. In this case also, the light guide portion 5 can be adhered to one surface having the light reflection function.

1: Display panel
2: Operation area
3: Surface light emitting device
4:
4a: first exposed portion
4b: second exposed portion
4c: third exposed portion
5:
5a: incident end
5b:
6: Connection
7: Adhesive for height adjustment
8: Light source
8a: Flexible printed circuit board (FPC)
8b: light emitting diode
11: Gas
12: contact sheet
13: Light guide sheet
14: Light source unit
141: Light emitting diode
15:
151: reflective layer
152: Absorbent layer

Claims (8)

A flat panel display panel,
A flexible sheet having a light reflection function and a light shielding function,
A flat light guide portion disposed between the display panel and the flexible sheet,
And a light source disposed on a side of the light guide section,
Wherein the flexible sheet has an adhesive material on at least a part of one surface having the light reflection function,
The light guide portion is adhered to one surface having the light reflection function by the adhesive material,
Wherein the flexible sheet has an exposed portion exposed at the periphery of the light guide portion, in addition to the side adjacent to the light source, and adheres the display panel and the flexible sheet by the adhesive material on the exposed portion,
Wherein the exposed portion includes a first exposed portion exposed from the opposite side of the light source of the light guiding portion and a second exposed portion exposed from the side of the light guiding portion,
Wherein the light guiding portion has flexibility and forms a height adjusting adhesive material between the display panel and the light guiding portion so that the light emitting center of the light source approaches or coincides with the center of the light guiding portion in the thickness direction,
Wherein an elevation difference between a light emitting center of the light source and a center of the light guide in the thickness direction is equal to or smaller than 1/4 of the size in the thickness direction of the light emitting element of the light source. The method according to claim 1,
Wherein the light guide portion is disposed between the display panel and the flexible sheet, and the adjacent light guide portion is connected to the connection portion. 3. The method of claim 2,
Wherein the connection portion is narrower in width direction than the light guiding portion in the width direction perpendicular to the connection direction. delete delete The method according to claim 1,
Wherein the flexible sheet has a light reflection layer and a light shielding layer,
Wherein the light reflecting layer is white or metallic and the light-shielding layer is black. delete The method according to claim 1,
Wherein the first exposed portion before adhesion is longer than the thickness of the light guide portion by 1.4 times the width in the width direction perpendicular to the connection direction.
KR2020150005760U 2014-09-09 2015-08-28 Planar light emitting device KR200485851Y1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201420515695.2 2014-09-09
CN201420515695.2U CN204176365U (en) 2014-09-09 2014-09-09 Sheet light emitting apparatus

Publications (2)

Publication Number Publication Date
KR20160000915U KR20160000915U (en) 2016-03-17
KR200485851Y1 true KR200485851Y1 (en) 2018-03-05

Family

ID=52565174

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2020150005760U KR200485851Y1 (en) 2014-09-09 2015-08-28 Planar light emitting device

Country Status (3)

Country Link
JP (1) JP3201084U (en)
KR (1) KR200485851Y1 (en)
CN (1) CN204176365U (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106352304A (en) * 2016-10-19 2017-01-25 武汉华星光电技术有限公司 Light guide plate structure and backlight module

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007033758A (en) 2005-07-26 2007-02-08 Sanyo Epson Imaging Devices Corp Display device
JP2011071054A (en) 2009-09-28 2011-04-07 Shin Etsu Polymer Co Ltd Light-emitting structure of portable equipment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4813383B2 (en) 2007-01-22 2011-11-09 アルプス電気株式会社 Light guide sheet
KR101042919B1 (en) * 2008-12-02 2011-06-20 주식회사 하이디스 Keypad assembly for mobile communication
KR101821286B1 (en) * 2011-04-29 2018-01-23 엘지전자 주식회사 Mobile terminal
KR101976067B1 (en) * 2012-07-25 2019-05-09 삼성디스플레이 주식회사 A display device providing touch emitting key unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007033758A (en) 2005-07-26 2007-02-08 Sanyo Epson Imaging Devices Corp Display device
JP2011071054A (en) 2009-09-28 2011-04-07 Shin Etsu Polymer Co Ltd Light-emitting structure of portable equipment

Also Published As

Publication number Publication date
KR20160000915U (en) 2016-03-17
JP3201084U (en) 2015-11-19
CN204176365U (en) 2015-02-25

Similar Documents

Publication Publication Date Title
US10670917B2 (en) Lighting device and display device
JP5983031B2 (en) Liquid crystal display device and electronic device
US20150049285A1 (en) Non-Planar Display Backlight Structures
US10274142B2 (en) Lighting device and display device
US8282259B2 (en) Backlight unit and display device
JP2007053063A (en) Sheet switch module
EP3726285B1 (en) Electronic device, and display assembly and backlight module thereof
JP2009301912A (en) Back light unit and liquid crystal display
US9864233B2 (en) Liquid crystal display device and electronic apparatus
US20130070476A1 (en) Planar illumination apparatus
CN111881753A (en) Backlight module and display device
JP4829811B2 (en) Illumination unit
US10203442B2 (en) Lighting device including a side emitting type light source for improved light efficiency and display device
EP3829147B1 (en) Electronic device and middle frame thereof
JP2017157467A (en) Surface light source device, display device, and electronic equipment
KR200485851Y1 (en) Planar light emitting device
JP2019021488A (en) Lighting device and liquid crystal display device
US20150042902A1 (en) Lighting device and display system including lighting device
US10175408B2 (en) Planar illumination apparatus
CN214138245U (en) Thinned vehicle-mounted touch backlight device and display device
JP2010034008A (en) Light guide sheet switch unit
KR20150064559A (en) Back light unit and display device having the same
US20210119077A1 (en) Reflective display
JP2008084651A (en) Lighting device, electro-optical device, electronic equipment
KR102202800B1 (en) Display Device

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
X70R Decision of rejection after re-examination
AMND Amendment
GRNO Decision to grant (after opposition)
REGI Registration of establishment