TWI479207B - Light guide panel - Google Patents
Light guide panel Download PDFInfo
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- TWI479207B TWI479207B TW100135411A TW100135411A TWI479207B TW I479207 B TWI479207 B TW I479207B TW 100135411 A TW100135411 A TW 100135411A TW 100135411 A TW100135411 A TW 100135411A TW I479207 B TWI479207 B TW I479207B
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- guide panel
- control pattern
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- 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
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- 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
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- 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
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Description
本發明係關於導光面板。具體而言，是關於組裝在行動電話等之移動裝置上，用在照明用或顯示用之面狀發光裝置所使用的發光面板。The present invention relates to a light guide panel. Specifically, it relates to a light-emitting panel used in a planar light-emitting device for illumination or display, which is incorporated in a mobile device such as a mobile phone.
第1圖乃示意地顯示使用了導光面板之面狀發光裝置的概略俯視圖，係顯示在發光時。第2圖為沿著第1圖中之X-X線所作的剖視圖。此面狀發光裝置係將自光源放射出之光取入導光面板內並擴展成面狀，並使光從導光面板表面的既定發光區域射出者。Fig. 1 is a schematic plan view schematically showing a planar light-emitting device using a light guide panel, which is displayed during light emission. Fig. 2 is a cross-sectional view taken along the line X-X in Fig. 1. The planar light-emitting device takes light emitted from the light source into the light guide panel and expands into a planar shape, and emits light from a predetermined light-emitting area on the surface of the light guide panel.
如第1圖所示，此面狀發光裝置11係將導光面板13重疊配置於基板12之表面，在與導光面板13之光入射端面15對向的位置將光源14安裝於基板12上者。於導光面板13之背面，如第2圖所示，以與欲使光射出之既定發光區域對向之方式形成顯示區16。於圖示例中，於導光面板13之背面的整體呈現字母「A」的區域，藉由凹設複數個微細的三角稜鏡狀之擴散圖案17而形成顯示區16。擴散圖案17之光源側之面形成約45°的傾斜面。光源14係將LED晶片封入樹脂製殼體內而成的LED光源，其具有比導光面板13之光射入端面的寬度還小之寬度。光源14係將其光射出面配置成接近於導光面板13之光射入端面15。As shown in FIG. 1, the planar light-emitting device 11 has the light guide panel 13 stacked on the surface of the substrate 12, and the light source 14 is mounted on the substrate 12 at a position facing the light incident end surface 15 of the light guide panel 13. By. On the back surface of the light guide panel 13, as shown in Fig. 2, the display region 16 is formed to face the predetermined light-emitting region where light is to be emitted. In the example of the drawing, the display area 16 is formed by recessing a plurality of fine triangular-shaped diffusion patterns 17 on the entire surface of the back surface of the light guide panel 13 in the letter "A". The surface on the light source side of the diffusion pattern 17 forms an inclined surface of about 45°. The light source 14 is an LED light source in which an LED chip is sealed in a resin case, and has a width smaller than a width of an light incident end surface of the light guide panel 13. The light source 14 has its light exit surface arranged close to the light incident end surface 15 of the light guide panel 13.
於此面狀發光裝置11中，當點亮光源14時，自光源14放射出之光，會從光射入端面15射入導光面板13內。射入導光面板13內之光，如第2圖之箭頭所示，在導光面板13之表面及背面被反複地進行全反射，藉此，被擴散至整個導光面板13，並於此途中藉由擴散圖案17被全反射的光係自導光面板13之表面朝前方射出。其結果，當從前方觀察面狀發光裝置11時，只有顯示區16(例如，第1圖中之字母「A」的區域)會明亮地發光。In the planar light-emitting device 11, when the light source 14 is turned on, the light emitted from the light source 14 enters the light guide panel 13 from the light incident end surface 15. As shown by the arrow in FIG. 2, the light incident on the light guide panel 13 is repeatedly reflected on the front and back surfaces of the light guide panel 13, thereby being diffused to the entire light guide panel 13, and The light that is totally reflected by the diffusion pattern 17 in the middle is emitted from the surface of the light guide panel 13 toward the front. As a result, when the planar light-emitting device 11 is viewed from the front, only the display region 16 (for example, the region of the letter "A" in the first drawing) is brightly illuminated.
然而，於導光面板13內，實際上會像在第1圖中標有點狀之陰影線的區域那樣，存在有不進行光之導光的區域B。因此，當如第1圖所示在區域B內設置顯示區16時，區域B內之顯示區16不發光，例如，成為欠缺了字母「A」的一部份之顯示。However, in the light guide panel 13, there is actually a region B where light is not guided as in the hatched region in the first figure. Therefore, when the display area 16 is provided in the area B as shown in Fig. 1, the display area 16 in the area B does not emit light, for example, a portion lacking the letter "A".
於區域B內不進行光之導光的理由如下。即使自光源14射出之光相對於發光之中心軸(通過光源14之中心，垂直於光源14之光放射面的軸)，在兩側具有90°之展開，但因為光在自光射入端面15射入導光面板13內之際會折射，所以，光在導光面板13內拓展的範圍，成為以發光中心軸為中心而於此中心兩側由角度θ(＜90°；以下稱為擴展角)所擴展的區域。此擴展角θ係與樹脂折射率產生之臨界角相等的值，例如，若導光面板13之折射率n為1.59，則依據司乃耳定律，θ=arcsin.(1/n)≒39°。藉此，在比自與光射入端面15之兩端對向的位置以擴展角θ延伸之各線段還靠外側的區域B內，不進行光之導光。The reason why the light guiding light is not performed in the area B is as follows. Even if the light emitted from the light source 14 has a 90° spread on both sides with respect to the central axis of the light (through the center of the light source 14 and perpendicular to the axis of the light radiating surface of the light source 14), since the light is incident on the end face from the light 15 is refracted when it enters the light guide panel 13, so that the range in which the light expands in the light guide panel 13 is centered on the central axis of the light, and the angle is θ (<90° on both sides of the center); Corner) The area that is expanded. The spread angle θ is a value equal to a critical angle at which the refractive index of the resin is generated. For example, if the refractive index n of the light guide panel 13 is 1.59, according to Sinae's law, θ=arcsin.(1/n)≒39° . Thereby, light guiding is not performed in the region B outside the respective line segments extending from the position opposite to the light incident end surface 15 at the expanded angle θ.
另外，自光源14放射之光的配向係大致成為郎伯分布，所以，射入導光面板13內之光的配向，亦是在發光中心軸方向上，其光強度大，而在越是與發光中心軸形成大的角度之方向，則光強度越小。因此，即使以不重疊於不導光之區域B的方式設置顯示區16，仍會有顯示區16之中央部明亮地發光，但兩端部份變暗的情況。Further, since the alignment of the light radiated from the light source 14 is substantially a Lange distribution, the alignment of the light incident on the light guide panel 13 is also in the direction of the central axis of the light, and the light intensity is large, and the When the central axis of the light forms a large angle, the light intensity is smaller. Therefore, even if the display region 16 is provided so as not to overlap the region B where the light is not guided, there is a case where the central portion of the display region 16 is brightly illuminated, but both ends are darkened.
為了避免這些不良狀況，如第3圖所示，雖可使顯示區16充分地遠離光源14且以顯示區16不與不導光之區域B重疊的方式設置顯示區16，但此情況下，與顯示區16之大小相比，導光面板13之尺寸亦變大。當導光面板13之尺寸變大時，則導光面板13之利用效率變差，並且使得組入行動裝置(尤其是小型行動裝置)之作業變得困難。In order to avoid these undesirable conditions, as shown in FIG. 3, although the display area 16 can be sufficiently away from the light source 14 and the display area 16 is not overlapped with the non-light-conducting area B, in this case, The size of the light guide panel 13 also becomes larger than the size of the display area 16. When the size of the light guide panel 13 becomes large, the utilization efficiency of the light guide panel 13 is deteriorated, and the work of assembling a mobile device (especially a small mobile device) becomes difficult.
為了改善如上述之配光的不均勻性，提出一種在導光面板之光射入端面施作加工之面狀發光裝置。第4及第5圖顯示此種改良例之其中一例。第4圖為顯示面狀發光裝置之改良例的概略俯視圖。第5圖為該改良例之概略剖視圖，為沿與第1圖之X-X線對應的線段之第4圖的剖視圖。In order to improve the unevenness of the light distribution as described above, a planar light-emitting device which is processed on the light incident end surface of the light guide panel is proposed. Figures 4 and 5 show an example of such an improvement. Fig. 4 is a schematic plan view showing a modified example of the planar light-emitting device. Fig. 5 is a schematic cross-sectional view showing the modified example, and is a cross-sectional view taken along line 4 of the line segment corresponding to the X-X line of Fig. 1.
於此改良例中，如第4圖所示，與光源14對向且於光射入端面15的一部份設置從垂直於導光面板13的表面之方向觀察時被彎曲成圓弧狀的凹部18。當在與光源14對向之位置上，於光射入端面15設置圓弧狀的凹部18時，射入導光面板13內之前後的光之行進方向的變化，與平坦之光射入端面15的情況比較變得較小，所以，導光面板13內之光的擴展變寬。因此，可減小不進行光之導光的區域B的面積。In this modified example, as shown in FIG. 4, a part of the light incident end surface 15 opposed to the light source 14 is curved in an arc shape when viewed from a direction perpendicular to the surface of the light guide panel 13. Concave portion 18. When the arc-shaped concave portion 18 is provided on the light incident end surface 15 at a position opposed to the light source 14, the change in the traveling direction of the light before and after entering the light guide panel 13 and the flat light entering the end surface The case of 15 is relatively small, so that the spread of light in the light guide panel 13 is widened. Therefore, the area of the region B where the light guiding light is not performed can be reduced.
然而，根據此改良例，如第5圖所示，因凹部18之原因，光源14之光放射面與導光面板13的光射入端面15之間的間隙變大，因此，自光源14射出之光朝上方漏光而變得不容易射入導光面板13內。因此，自光源14放射而射入導光面板13內之光量減少，造成光利用效率的降低，所以，會有顯示區16整體變暗的不良情況。However, according to the modified example, as shown in FIG. 5, the gap between the light emitting surface of the light source 14 and the light incident end surface 15 of the light guide panel 13 is increased by the concave portion 18, and therefore, the light source 14 is emitted from the light source 14. The light leaks light upward and becomes less likely to enter the light guide panel 13. Therefore, the amount of light that is incident from the light source 14 and incident on the light guide panel 13 is reduced, resulting in a decrease in light use efficiency. Therefore, there is a problem that the entire display region 16 is darkened.
另外，於專利文獻1揭示有如第6圖所示之發光面板組件。於專利文獻1之發光面板組件中，於光輸出區域21(用以使光射出之有效區域)的端面，設置2個用以對來自光源23之光進行擴展並輸入光輸出區域21的光移動區域22，且於各個光移動區域22之一端配置光源23。Further, Patent Document 1 discloses a light-emitting panel assembly as shown in Fig. 6. In the light-emitting panel assembly of Patent Document 1, two light beams for expanding the light from the light source 23 and inputting the light output region 21 are provided on the end faces of the light output region 21 (the effective region for emitting light). The area 22 is provided with a light source 23 at one end of each of the light moving areas 22.
根據此種構造，如第6圖中之2點鏈線所示，與由一個光移動區域24及一個光源25所構成之情況比較，可縮短光移動區域22之長度。但是，僅以其中任一個光源23，則在第6圖中以虛線所圈的區域內，光無法被傳輸而使得該區域變暗，所以，需要有2個光源23(隨著光輸出區域21之寬度變大，則需要更多個光源)，所以，具有製造成本及消耗電力增加的不良。According to this configuration, as shown by the two-dot chain line in Fig. 6, the length of the light moving region 22 can be shortened as compared with the case of the one light moving region 24 and one light source 25. However, with only one of the light sources 23, the light cannot be transmitted in the area circled by the broken line in Fig. 6, so that the area is darkened. Therefore, two light sources 23 are required (along with the light output area 21) If the width is increased, more light sources are required, and therefore, there is a problem in that the manufacturing cost and the power consumption increase.
專利文獻1 日本特表2002-538577號公報(第7圖)Patent Document 1 Japanese Patent Application Publication No. 2002-538577 (Fig. 7)
本發明係鑒於此種技術課題而完成者，其目的在於提供一種藉由擴展所射入之光的配向，可擴大有效區域，且光利用效率不容易降低，而且光的配向分布之控制性高的導光面板。The present invention has been made in view of such technical problems, and an object thereof is to provide an aspect in which an effective region can be enlarged by expanding the alignment of light incident thereon, and light utilization efficiency is not easily lowered, and controllability of light distribution is high. Light guide panel.
本發明之導光面板，係將光源的光以自端面取入而擴展成面狀，藉由設於光射出面及與該光射出面對向之面當中至少一面上的擴散圖案使光穿透或反射，而自該光射出面之既定區域朝外部射出光的方式構成之導光面板，其特徵為：於該端面中的光源之光所射入的區域附近，且於該光射出面及與該光射出面對向之面當中至少一面上設置用以擴展進行導光之光的配向方向之配光控制圖案。In the light guiding panel of the present invention, the light of the light source is expanded into a planar shape by taking in from the end surface, and the light is passed through a diffusion pattern provided on at least one of the light emitting surface and the surface facing the light. a light guide panel configured to transmit or illuminate light from a predetermined area of the light exit surface to the outside, and is characterized by: a region near the region where the light of the light source enters the end surface, and the light exit surface And a light distribution control pattern for extending an alignment direction of the light for guiding light is provided on at least one of the faces facing the light.
本發明之導光面板，係於來自光源之光所射入的區域附近，且在光射出面及與光射出面對向之面當中至少一面上設置用以擴展進行導光之光的配向之配光控制圖案，所以，能以配光控制圖案使自光源射入導光面板內之光的一部份反射，藉此，可擴展導光於導光面板內之光的範圍。藉此，可將光輸送至導光面板之角部或邊緣而予照亮，可使設有擴散圖案之顯示區或有效區域整體明亮地發光。而且，因為不需要使顯示區等與光源分離，所以，不需要增大導光面板。另外，不需要增加光源之個數，所以，可抑制成本及消耗電力。The light guiding panel of the present invention is disposed in the vicinity of a region from which the light from the light source is incident, and is provided on at least one of the light emitting surface and the surface facing the light emitting surface to expand the alignment of the light for guiding the light. Since the light distribution control pattern reflects a part of the light that is incident from the light source into the light guide panel by the light distribution control pattern, the range of light guided in the light guide panel can be expanded. Thereby, the light can be sent to the corners or edges of the light guide panel to be illuminated, and the display area or the effective area provided with the diffusion pattern can be brightly illuminated as a whole. Moreover, since it is not necessary to separate the display area or the like from the light source, it is not necessary to increase the light guide panel. In addition, since it is not necessary to increase the number of light sources, cost and power consumption can be suppressed.
本發明之導光面板的一個實施態樣，其特徵為：具有複數個該配光控制圖案，該配光控制圖案係朝欲使以該圖案反射之光進行配光的方向，圍繞垂直於該光射出面之軸呈傾斜狀地配置。根據該實施態樣，利用使配光控制圖案傾斜，可使以該配光控制圖案所反射之光的方向變化，另外，藉由調整此傾斜(角度)，可控制反射光之行進方向。An embodiment of the light guiding panel of the present invention is characterized in that: a plurality of the light distribution control patterns are arranged in a direction to distribute light reflected by the pattern, and are perpendicular to the direction The axis of the light exit surface is arranged in an inclined shape. According to this embodiment, by changing the light distribution control pattern, the direction of the light reflected by the light distribution control pattern can be changed, and by adjusting the inclination (angle), the traveling direction of the reflected light can be controlled.
尤其是當從與該光射出面垂直之方向觀察時，在隔著自光源射達之光的配光分布之中心軸而設之一側的區域與另一側的區域中，藉由使該配光控制圖案朝互為相反之朝向傾斜，可分別朝外彎曲反射光，進而可擴展導光面板內之配光分布。In particular, when viewed from a direction perpendicular to the light exit surface, the region on one side and the other side in the center axis of the light distribution distributed through the light incident from the light source are The light distribution control patterns are inclined toward each other in opposite directions, and the reflected light can be respectively bent outward, thereby expanding the light distribution in the light guide panel.
另外，於此實施態樣中，從與該光射出面垂直之方向觀察時，相對於自光源射達之光的配光分布之中心軸，若呈線對稱地配置該配光控制圖案，可左右均等地擴展導光面板之配光分布。Further, in this embodiment, when viewed from a direction perpendicular to the light exit surface, the light distribution control pattern is arranged in line symmetry with respect to a central axis of the light distribution of the light incident from the light source. The light distribution of the light guide panel is equally extended left and right.
又，於此實施態樣中，從與該光射出面垂直之方向觀察時，於自光源射達之光的光量多之區域中以大密度配置該配光控制圖案，並在光量少之區域中以小密度配置該配光控制圖案，藉此，可將導光面板之亮度分布均勻化，可減低亮度不勻。Further, in this embodiment, when viewed from a direction perpendicular to the light exit surface, the light distribution control pattern is disposed at a large density in a region where the amount of light emitted from the light source is large, and the amount of light is small. The light distribution control pattern is disposed at a small density in the area, whereby the brightness distribution of the light guide panel can be made uniform, and unevenness in brightness can be reduced.
本發明之導光面板的另一個實施態樣，其特徵為：該配光控制圖案係該光射出面及與該光射出面對向之面當中至少一面上所設置的三角稜鏡狀之凹部。根據該實施態樣，能以配光控制圖案之各面中的位於離該端面(光射入端面)較遠側之傾斜面(偏向反射面)使入射光反射，此時能使光之導光方向變化，而不自光射出面射出，進一步行進於導光面板內。Another embodiment of the light guiding panel of the present invention is characterized in that the light distribution control pattern is a triangular-shaped concave portion provided on at least one of the light exiting surface and the surface facing the light emitting surface. . According to this embodiment, the incident light can be reflected by the inclined surface (biased reflecting surface) located on the far side of the end surface (light incident end surface) among the respective surfaces of the light distribution control pattern, and the light guide can be made at this time. The light direction changes without being emitted from the light exit surface, and further travels inside the light guide panel.
另外，於此實施態樣中，當設導光面板之構成樹脂的臨界角(全反射之臨界角)為θc[°]時，若將該配光控制圖案之位於離該端面較遠側之傾斜面的傾斜角作成小於90°-θc時(例如，導光面板之構成樹脂為聚碳酸酯樹脂的情況，將配光控制圖案之位於離該端面較遠側之傾斜面的傾斜角作成小於51°)，可使光不容易從配光控制圖案朝外部漏光，可減小光量損失。In addition, in this embodiment, when the critical angle of the constituent resin of the light guide panel (the critical angle of total reflection) is θc [°], if the light distribution control pattern is located farther from the end surface, When the inclination angle of the inclined surface is less than 90°-θc (for example, when the constituent resin of the light guide panel is a polycarbonate resin, the inclination angle of the inclined surface of the light distribution control pattern located farther from the end surface is made smaller than 51°), light can be easily leaked from the light distribution control pattern to the outside, and the amount of light loss can be reduced.
本發明之面狀發光裝置，係由光源與導光面板所構成，且建構成將該光源之光自該導光面板之端面取入該導光面板內並擴展成面狀，藉由設於該導光面板之光射出面及與該光射出面對向之面當中至少一面上的擴散圖案使光穿透或反射，而自該光射出面之既定區域朝該導光面板之外部射出光的面狀發光裝置，其特徵為：於該光源附近之區域，且於該導光面板之該光射出面及與該光射出面對向之面當中至少一面上設置用以對導光於導光面板內之光的配向分布進行擴展之配光控制圖案。The planar light-emitting device of the present invention is composed of a light source and a light-guiding panel, and is configured to take light from the light source into the light-guiding panel from the end surface of the light-guiding panel and expand into a planar shape. a diffusing pattern on at least one of a light exit surface of the light guide panel and a surface facing the light emitting surface transmits or reflects light, and emits light from a predetermined area of the light exit surface toward the outside of the light guide panel The planar light-emitting device is characterized in that: in a region near the light source, at least one of the light exiting surface of the light guiding panel and the surface facing the light emitting surface is provided for guiding light The light distribution control pattern of the light distribution in the light panel is expanded.
本發明之面狀發光裝置，係於來自光源之光所射入的區域附近，且於光射出面及與光射出面對向之面當中至少一面上設置用以擴展進行導光之光的配向方向之配光控制圖案，所以，能以配光控制圖案使自光源射入導光面板內之光的一部份反射，藉此，可擴展導光於導光面板內之光的範圍。藉此，可將光輸送至導光面板之角部或邊緣而予照亮，可使設有擴散圖案之顯示區或有效區域整體明亮地發光。而且，因為不需要使顯示區等與光源分離，所以，不需要增大導光面板。另外，不需要增加光源之個數，所以，可抑制成本及消耗電力。The planar light-emitting device of the present invention is disposed in the vicinity of a region from which the light from the light source enters, and is provided with at least one of a light exiting surface and a surface facing the light emitting surface to expand the light guiding light. Since the light distribution control pattern is in the direction, a portion of the light that is incident from the light source into the light guide panel can be reflected by the light distribution control pattern, thereby expanding the range of light guided in the light guide panel. Thereby, the light can be sent to the corners or edges of the light guide panel to be illuminated, and the display area or the effective area provided with the diffusion pattern can be brightly illuminated as a whole. Moreover, since it is not necessary to separate the display area or the like from the light source, it is not necessary to increase the light guide panel. In addition, since it is not necessary to increase the number of light sources, cost and power consumption can be suppressed.
本發明之面狀發光裝置的一個實施態樣，其特徵為：於設有該配光控制圖案之區域中，且於該導光面板之該光射出面及與該光射出面對向之面當中至少一面上黏貼反射片。根據該實施態樣，在以配光控制圖案反射之光的一部份朝與光射出面大致垂直的方向行進而欲自導光面板朝外部漏光時，能以反射片使此光反射而返回導光面板內，可減低光量損失。另外，於以黏著劑等將反射片黏貼於導光面板時，光線因黏著劑而進行散射，所以，可進一步提高擴展配光分布之效果。An embodiment of the planar light-emitting device of the present invention is characterized in that, in a region where the light distribution control pattern is provided, the light exit surface of the light guide panel and the light emitting surface face each other Adhere to the reflective sheet on at least one side. According to this embodiment, when a portion of the light reflected by the light distribution control pattern travels in a direction substantially perpendicular to the light exit surface and is to leak light from the light guide panel toward the outside, the light can be reflected by the reflection sheet and returned. Light loss can be reduced in the light guide panel. Further, when the reflection sheet is adhered to the light guide panel with an adhesive or the like, the light is scattered by the adhesive, so that the effect of expanding the light distribution can be further enhanced.
另外，於該實施態樣中，在將該反射片進一步覆蓋於該導光面板與該光源之間的間隙部份的情況下，能以反射片使朝偏離導光面板之端面的方向射出而成為無用之光源的光反射，而使該光射入導光面板內，可提高光之利用效率，提高導光面板之亮度。In addition, in the embodiment, when the reflection sheet is further covered by the gap portion between the light guide panel and the light source, the reflection sheet can be emitted in a direction away from the end surface of the light guide panel. It becomes a light reflection of a useless light source, and this light is incident on the light guide panel, thereby improving light utilization efficiency and improving the brightness of the light guide panel.
又，用以解決本發明之該課題之手段，係具有將以上說明之構成要素適宜地組合而成的特徵，本發明係可根據上述構成要素之組合而作各種之變化。In addition, the means for solving the problem of the present invention has a feature in which the above-described constituent elements are appropriately combined, and the present invention can be variously changed in accordance with the combination of the above-described constituent elements.
以下，一面參照圖面，一面針對本發明之較佳實施形態進行說明。但是，本發明不受以下之實施形態所限制，只要在未超出本發明之實質範圍內，即可作各種設計及變更。Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and various modifications and changes can be made without departing from the spirit and scope of the invention.
本發明之導光面板係使用於面狀發光裝置。面狀發光裝置係將自光源放射之光導入導光板內，且將射入導光板內之光擴展成面狀而自光射出面的既定區域射出。此種面狀發光裝置係可組裝於例如行動電話等之移動裝置上，而被利用於照明用或顯示用。The light guiding panel of the present invention is used in a planar light emitting device. In the planar light-emitting device, light emitted from a light source is introduced into a light guide plate, and light incident on the light guide plate is expanded into a planar shape and emitted from a predetermined region of the light exit surface. Such a planar light-emitting device can be incorporated into a mobile device such as a mobile phone, and used for illumination or display.
第7圖為示意地顯示本發明之第1實施形態之面狀發光裝置31的俯視圖，其顯示發光時之狀態。第8圖為沿第7圖中之Y-Y線所作的剖視圖。如第7及第8圖所示，於面狀發光裝置31中，導光面板33被重疊配置於基板32之表面，在與導光面板33之光射入端面35對向的位置處，於基板32上安裝有光源34。Fig. 7 is a plan view schematically showing the planar light-emitting device 31 according to the first embodiment of the present invention, showing a state in which light is emitted. Fig. 8 is a cross-sectional view taken along the line Y-Y in Fig. 7. As shown in FIGS. 7 and 8, in the planar light-emitting device 31, the light guide panel 33 is placed on the surface of the substrate 32 so as to overlap the light incident end surface 35 of the light guide panel 33. A light source 34 is mounted on the substrate 32.
光源34係比光射入端面35之寬度小的所謂點狀光源，不包含具有與光射入端面35之寬度相等的寬度(長度)之冷陰極射線管等。一般使用之光源34為LED光源，於透明封裝樹脂內封入有一個或複數個LED晶片34a，且除了透明封裝樹脂之前面(光放射面)以外，全部以白色樹脂覆被。當點亮LED晶片34a時，自光放射面以大致郎伯分布之方式放射出白色光或有色光。光源34係以較小之間隙而與光射入端面35對向、或者抵接於光射入端面35。自光源34放射之光，係從與光射入端面35中與光源34之前面對向的區域(光射入區域39)射入導光面板33內。The light source 34 is a so-called point light source having a smaller width than the light incident end surface 35, and does not include a cold cathode ray tube or the like having a width (length) equal to the width of the light incident end surface 35. The light source 34 generally used is an LED light source, and one or a plurality of LED wafers 34a are sealed in a transparent encapsulating resin, and all of them are covered with a white resin except for the front surface (light emitting surface) of the transparent encapsulating resin. When the LED chip 34a is lit, white light or colored light is emitted from the light emitting surface in a substantially Langer distribution. The light source 34 faces the light incident end surface 35 with a small gap or abuts against the light incident end surface 35. The light radiated from the light source 34 enters the light guide panel 33 from a region (light incident region 39) facing the light source 34 before the light incident end surface 35.
導光面板33係由折射率大之透光性樹脂、例如聚碳酸酯樹脂、丙烯酸樹脂或聚甲基丙烯酸甲酯樹脂(PMMA)等形成為矩形之板狀或片狀。於導光面板33之背面分別設有複數個擴散圖案37及配光控制圖案38。又，亦可於基板32之表面中與導光面板33的背面對向之區域，塗布白色塗料、或者塗布白色樹脂、或者形成金屬薄膜而形成光反射層。The light guide panel 33 is formed into a rectangular plate shape or a sheet shape from a light transmissive resin having a large refractive index, for example, a polycarbonate resin, an acrylic resin, or a polymethyl methacrylate resin (PMMA). A plurality of diffusion patterns 37 and a light distribution control pattern 38 are respectively disposed on the back surface of the light guide panel 33. Further, a light-reflecting layer may be formed by applying a white paint or a white resin or a metal thin film to a region of the surface of the substrate 32 that faces the back surface of the light guide panel 33.
擴散圖案37係藉由對導光於導光面板33內之光進行反射或全反射而使光從導光面板33之表面(光射出面40)射出者。擴散圖案37係可設於導光面板33之有效區域的大致整個區域、或者亦可僅設於顯示所需之文字、標記、圖案等之顯示區36。於將擴散圖案37設於有效區域的大致整個區域的情況下，光射出面40之整個有效區域進行發光，所以，可將面狀發光裝置31利用於背光等之照明用。另外，於僅在既定的顯示區36設置擴散圖案37的情況下，則可利用於顯示用。於圖示例中，主要顯示用於顯示用之情況，顯示區36顯示文字「A」。以下，針對用於顯示用之情況進行說明，但並非意味排除用於照明用之情況。The diffusion pattern 37 emits light from the surface (light exit surface 40) of the light guide panel 33 by reflecting or totally reflecting the light guided in the light guide panel 33. The diffusion pattern 37 may be provided in substantially the entire area of the effective area of the light guide panel 33, or may be provided only in the display area 36 for displaying characters, marks, patterns, and the like required. When the diffusion pattern 37 is provided over substantially the entire area of the effective area, the entire effective area of the light exit surface 40 emits light. Therefore, the planar light-emitting device 31 can be used for illumination such as a backlight. Further, in the case where the diffusion pattern 37 is provided only in the predetermined display area 36, it can be used for display. In the example of the figure, the main display is for display, and the display area 36 displays the character "A". Hereinafter, the case for display will be described, but it is not intended to exclude the case for use in illumination.
擴散圖案37係形成於導光面板33之背面的凹部，如第9(A)圖所示，一個擴散圖案37具有三角稜鏡狀之形狀。反射面37a係用以使導光於導光面板33內之光進行全反射的面，其朝向光射入端面35側。如第9(B)圖所示，反射面37a之傾斜角α係設定為使進行全反射之光朝向與光射出面40大致垂直的方向而自光射出面40朝外部射出的角度，傾斜角α約為45°。擴散圖案37之背面37b的傾斜角β係90°或略比90°小之角度。未被反射面37a全反射而穿過反射面37a之光，係穿過背面37b再射入導光面板33內而被再利用。The diffusion pattern 37 is a concave portion formed on the back surface of the light guide panel 33. As shown in Fig. 9(A), one diffusion pattern 37 has a triangular shape. The reflecting surface 37a is a surface for totally reflecting light guided in the light guiding panel 33, and is incident on the end surface 35 side toward the light. As shown in Fig. 9(B), the inclination angle α of the reflection surface 37a is set such that the total reflection light is directed toward the outside from the light exit surface 40 in a direction substantially perpendicular to the light exit surface 40, and the inclination angle is set. α is approximately 45°. The inclination angle β of the back surface 37b of the diffusion pattern 37 is 90° or slightly smaller than 90°. The light that is totally reflected by the reflecting surface 37a and passes through the reflecting surface 37a passes through the back surface 37b and is incident into the light guiding panel 33 to be reused.
又，擴散圖案37係亦可形成為第9圖所示之形狀以外的各種形狀。擴散圖案37只要是以反射面37a使光進行全反射並自光射出面40射出者即可，所以，背面37b的傾斜角可為任意之角度。例如，於第10(A)及第10(B)圖所示之擴散圖案37中，背面37b之傾斜角係與反射面37a之傾斜角相等(亦即，β=α)，其截面形狀成為二等邊三角形。Further, the diffusion pattern 37 may be formed into various shapes other than the shape shown in FIG. The diffusion pattern 37 only needs to be totally reflected by the reflection surface 37a and emitted from the light exit surface 40. Therefore, the inclination angle of the back surface 37b can be an arbitrary angle. For example, in the diffusion pattern 37 shown in Figs. 10(A) and 10(B), the inclination angle of the back surface 37b is equal to the inclination angle of the reflection surface 37a (i.e., β = α), and the cross-sectional shape thereof becomes Second equilateral triangle.
另外，擴散圖案37亦可為整體彎曲且反射面37a被彎曲成凹面狀者或被彎曲成凸面狀者。另外，擴散圖案37亦可為三角錐圖案、四角錐(稜錐體形)圖案、大致圓錐狀圖案。另外，擴散圖案37亦可為印刷於導光面板33之背面的白色之光擴散油墨等。Further, the diffusion pattern 37 may be curved as a whole and the reflecting surface 37a may be curved into a concave shape or curved into a convex shape. Further, the diffusion pattern 37 may be a triangular pyramid pattern, a quadrangular pyramid (pyramidal) pattern, or a substantially conical pattern. Further, the diffusion pattern 37 may be a white light-diffusing ink or the like printed on the back surface of the light guide panel 33.
配光控制圖案38係用以擴展自光射入區域39射入導光面板33內之光的配向分布者，是在光射入區域39之附近被設於導光面板33之背面。配光控制圖案38亦是形成於導光面板33之背面的凹部，如第11(A)圖所示，一個配光控制圖案38具有三角稜鏡狀之形狀。配光控制圖案38之偏向反射面38a係藉由使射入導光面板33內之光進行全反射，而從與光射出面40垂直之方向觀察時在反射前後以使光的行進方向變化者。偏向反射面38a之傾斜角ε越大，則使反射之光的配向發生變化的效果越大，但光卻變得不容易射入偏向反射面38a。The light distribution control pattern 38 is an alignment distributor for expanding light incident on the light guide panel 33 from the light incident region 39, and is provided on the back surface of the light guide panel 33 in the vicinity of the light incident region 39. The light distribution control pattern 38 is also a concave portion formed on the back surface of the light guide panel 33. As shown in Fig. 11(A), one light distribution control pattern 38 has a triangular shape. The deflecting reflection surface 38a of the light distribution control pattern 38 is a total reflection of light incident on the light guiding panel 33, and is changed from the direction perpendicular to the light exit surface 40 to change the traveling direction of the light before and after the reflection. . The larger the inclination angle ε of the deflecting reflection surface 38a, the greater the effect of changing the alignment of the reflected light, but the light does not easily enter the deflecting surface 38a.
導光於導光面板33內之光中的對導光面板33之表面或背面(不是配光控制圖案38的部份)以比全反射之臨界角θc[°]小之入射角射入之光，會從導光面板33之表面或背面漏光至外部。藉此，導光於導光面板33內之光的展開範圍，係在與導光面板33之表面及光射入端面35垂直的截面內，以垂直於光射入端面35之方向為中心朝表面側及背面側分別成為“90°-臨界角θc”。藉此，在配光控制圖案38之偏向反射面38a的傾斜角ε大於“90°-臨界角θc”的情況下，變得光完全無法射入偏向反射面38a，所以，為了使光射入偏向反射面38a而在此進行全反射，需要將偏向反射面38a的傾斜角ε作成“90°-臨界角θc”以下。例如，於導光面板33之折射率為1.59(聚碳酸酯樹脂之折射率)的情況下，臨界角θc為39°，所以，導光於導光面板33內之光的朝背面側之展開範圍成為51°(=90°-39°)。藉此，若偏向反射面38a的傾斜角ε為51°以下時，即可使導光於導光面板33內之光進行全反射。另外，於導光面板33之折射率為1.49(丙烯酸樹脂之折射率)的情況下，臨界角θc為42°，所以，導光於導光面板33內之光的朝背面側之展開範圍成為48°(=90°-42°)。藉此，若偏向反射面38a的傾斜角ε為48°以下時，即可使導光於導光面板33內之光進行全反射。另一方面，當偏向反射面38a的傾斜角ε變小時，光變得容易照射於偏向反射面38a，但卻會相應減少相當於該部份之使光偏向的效果，所以，當傾斜角ε過小時，會造成效率降低。藉此，最佳之傾斜角ε的值係藉由實驗或者採用模擬所決定。The surface or the back surface of the light guiding panel 33 (not the portion of the light distribution control pattern 38) that is guided by the light in the light guiding panel 33 is incident at an incident angle smaller than the critical angle θc [°] of the total reflection. Light leaks from the surface or the back surface of the light guide panel 33 to the outside. Thereby, the light-expanding range of the light guided in the light guide panel 33 is in a cross section perpendicular to the surface of the light guide panel 33 and the light incident end surface 35, and is oriented perpendicular to the direction in which the light is incident on the end surface 35. The front side and the back side are respectively "90° - critical angle θc". Therefore, when the inclination angle ε of the deflecting reflection surface 38a of the light distribution control pattern 38 is larger than "90° - the critical angle θc", the light is completely prevented from entering the deflecting surface 38a, so that the light is incident. The total reflection is performed on the deflecting surface 38a, and the inclination angle ε of the deflecting surface 38a needs to be "90°-critical angle θc" or less. For example, when the refractive index of the light guide panel 33 is 1.59 (the refractive index of the polycarbonate resin), the critical angle θc is 39°, so that the light guided to the light guide panel 33 is developed toward the back side. The range becomes 51° (=90°-39°). Thereby, when the inclination angle ε of the deflecting reflection surface 38a is 51° or less, the light guided in the light guiding panel 33 can be totally reflected. Further, when the refractive index of the light guide panel 33 is 1.49 (the refractive index of the acrylic resin), the critical angle θc is 42°, so that the development range of the light guided to the light guide panel 33 toward the back side becomes 48° (=90°-42°). Thereby, when the inclination angle ε of the deflecting reflection surface 38a is 48° or less, the light guided in the light guide panel 33 can be totally reflected. On the other hand, when the inclination angle ε of the deflecting reflection surface 38a becomes small, the light is easily irradiated onto the deflecting reflection surface 38a, but the effect corresponding to the partial deviation of the light is reduced correspondingly, so when the inclination angle ε When it is too small, it will cause a decrease in efficiency. Thereby, the value of the optimum tilt angle ε is determined by experiment or by simulation.
配光控制圖案38之前面38b係朝向光射入端面35側，前面38b之傾斜角γ係90°或略比90°小之角度。當前面38b之高度高時，光容易照射於前面38b，使得光穿過前面38b而朝導光面板33之外面漏光，造成光量損失，所以以前面38b之高度低者較為適宜。The front surface 38b of the light distribution control pattern 38 faces the side of the light incident end face 35, and the inclination angle γ of the front surface 38b is 90° or slightly smaller than 90°. When the height of the front surface 38b is high, light is easily irradiated to the front surface 38b, so that light passes through the front surface 38b and leaks light toward the outer surface of the light guide panel 33, resulting in loss of light amount. Therefore, it is preferable that the height of the front surface 38b is low.
如第7及第12圖所示，從垂直於光射出面40之方向觀察時，配光控制圖案38係配置為將光源34之發光中心軸T作為中心而呈線對稱，並相對於發光中心軸T以一側之區域與另一側之區域朝互為相反朝向傾斜的方式配置。亦即，於第7圖中，在發光中心軸T之右側區域，各配光控制圖案38係圍繞垂直於光射出面40之軸而自發光中心軸T順時針旋轉角度Φ(＞0)，在發光中心軸T之左側區域，各配光控制圖案38係圍繞垂直於光射出面40之軸而自發光中心軸T逆時針旋轉角度Φ(＞0)所形成。藉此，當自光射入區域39射入導光面板33內之光射入配光控制圖案38時，或者當射入導光面板33內之光在導光面板33的表面及背面進行反射而射入配光控制圖案38時，如第13圖所示，在右側之配光控制圖案38之偏向反射面38a進行全反射之光朝右側方向折彎，在左側之配光控制圖案38之偏向反射面38a進行全反射之光朝左側方向折彎。其結果，可藉由配光控制圖案38擴展配光分布，對若無配光控制圖案38時成為不進行光之導光的區域B之區域，亦可進行光之導光，如第7圖所示，使得不進行光之導光的區域B變小。另外，在與發光中心軸T形成較大之角度的方向上亦進行光之導光，可使得導光面板33內之亮度達成均勻化。藉此，如第7圖所示，可在整個顯示區36進行發光。As shown in FIGS. 7 and 12, when viewed in a direction perpendicular to the light exit surface 40, the light distribution control pattern 38 is arranged to be line-symmetric with respect to the center axis T of the light source 34 as a center, and is relatively symmetrical with respect to the center of the light. The axis T is disposed such that the region on one side and the region on the other side are inclined toward each other. That is, in FIG. 7, in the right region of the central axis T of the light, each light distribution control pattern 38 is rotated clockwise by an angle Φ (>0) from the central axis T of the light about an axis perpendicular to the light exit surface 40. In the left region of the central axis of illumination T, each light distribution control pattern 38 is formed by a counterclockwise rotation angle Φ (>0) from the central axis of illumination T about an axis perpendicular to the light exit surface 40. Thereby, when light incident into the light guide panel 33 from the light incident region 39 is incident on the light distribution control pattern 38, or when light incident into the light guide panel 33 is reflected on the front and back surfaces of the light guide panel 33, When the light distribution control pattern 38 is incident, as shown in FIG. 13, the light totally reflected by the deflecting reflection surface 38a of the light distribution control pattern 38 on the right side is bent in the right direction, and the light distribution control pattern 38 on the left side is bent. The light that is totally reflected by the deflecting reflection surface 38a is bent in the left direction. As a result, the light distribution pattern can be extended by the light distribution control pattern 38, and the light guiding light can be performed in the region of the region B where the light guiding light is not emitted when the light distribution control pattern 38 is not provided, as shown in FIG. It is shown that the area B where light guiding is not performed becomes small. Further, light guiding light is also performed in a direction in which a large angle is formed with the central axis T of the light emission, so that the brightness in the light guiding panel 33 can be made uniform. Thereby, as shown in FIG. 7, light can be emitted throughout the display area 36.
當設立於偏向反射面38a之法線為N時，如第12圖所示，從垂直於光射出面40之方向觀察時，配光控制圖案38之傾角Φ係可定義為法線和與發光中心軸T平行之方向所形成之角度。此傾角Φ係可在考慮到設有顯示區36之區域等的基礎上，藉由實驗或模擬來確定最適當之值。When the normal line set on the deflecting reflection surface 38a is N, as shown in Fig. 12, when viewed from a direction perpendicular to the light exit surface 40, the inclination angle Φ of the light distribution control pattern 38 can be defined as a normal line and a light emission. The angle formed by the direction in which the central axis T is parallel. This inclination angle Φ can be determined by experiment or simulation based on the area in which the display area 36 is provided or the like.
另外，配光控制圖案38之配置(分布)或密度，亦可在考慮到光之整體之配光分布的基礎上來確定。然而，這些之配光控制圖案38係遮蔽或妨礙正常進行導光之光，所以，當較多地設置配光控制圖案38時，恐有產生光量降低之擔憂。藉此，配光控制圖案38係需要以其形狀、尺寸、密度等成為最佳之方式進行設計。導光於導光面板33內之所有光，並非說一定會全被擴散圖案37所反射而利用於發光顯示，所以，只要以最佳化方式設計配光控制圖案38的話，即使光受到配光控制圖案38之妨礙，亦不會對面狀發光裝置31帶來較大之效率降低。反而是被擴展成廣範圍之光，會更多地被利用於顯示區36之顯示，從而可提高光之利用效率，提高整體之亮度效率。Further, the arrangement (distribution) or density of the light distribution control pattern 38 may be determined in consideration of the light distribution of the entire light. However, since the light distribution control pattern 38 shields or hinders light that normally conducts light, when the light distribution control pattern 38 is provided in a large amount, there is a fear that the amount of light is lowered. Thereby, the light distribution control pattern 38 needs to be designed in such a manner that its shape, size, density, and the like are optimal. All the light guided in the light guide panel 33 is not necessarily reflected by the diffusion pattern 37 and is used for the light-emitting display. Therefore, even if the light distribution control pattern 38 is designed in an optimized manner, even if the light is subjected to light distribution The obstruction of the control pattern 38 does not cause a large efficiency reduction to the planar light-emitting device 31. Rather, it is expanded into a wide range of light, which is more utilized in the display of the display area 36, thereby improving the efficiency of light utilization and improving the overall brightness efficiency.
又，配光控制圖案38不限於是具有第11圖所示之平坦的偏向反射面38a者，如第14(A)圖所示，偏向反射面38a亦可成為凸曲面，或者，如第14(B)圖所示，偏向反射面38a亦可成為凹曲面。在偏向反射面38a成為凸曲面之配光控制圖案38中，可使由偏向反射面38a所反射之光進行擴散，在偏向反射面38a成為凹曲面之配光控制圖案38中，可使由偏向反射面38a所反射之光具有聚光性。另外，亦可使偏向反射面38a為平坦之配光控制圖案38、偏向反射面38a為凸曲面之配光控制圖案38、偏向反射面38a為凹曲面之配光控制圖案38混合利用。Further, the light distribution control pattern 38 is not limited to the flat deflection surface 38a shown in Fig. 11, and as shown in Fig. 14(A), the deflection surface 38a may be a convex curved surface, or, as in the 14th. As shown in (B), the deflecting surface 38a may also have a concave curved surface. In the light distribution control pattern 38 in which the deflecting reflection surface 38a has a convex curved surface, the light reflected by the deflecting surface 38a can be diffused, and in the light distribution control pattern 38 in which the deflecting surface 38a has a concave curved surface, the bias can be biased. The light reflected by the reflecting surface 38a has condensing properties. Further, the light distribution control pattern 38 in which the deflecting reflection surface 38a is flat, the light distribution control pattern 38 in which the deflecting reflection surface 38a has a convex curved surface, and the light distribution control pattern 38 in which the deflecting reflection surface 38a has a concave curved surface may be used in combination.
其次，針對藉由模擬對配光控制圖案38進行驗證所得之結果進行說明。第15及第16圖顯示用於模擬之面狀發光裝置的模型。如第16圖所示，光源34係以光放射面之寬度c為1.8mm，與光射入端面35之間間隔f=0.2mm之間隙的方式所配置。光源34係作成藉由藍色LED與(黃色)螢光體之組合而發出白色光的LED光源，且自光源34放射郎伯分布之光。配光控制圖案38係於縱向a=1mm、橫寬b=2mm的區域內，以0.1mm之間隔(中心間距離)配置200個。配光控制圖案38係以發光中心軸T為中心而呈線對稱配置，配光控制圖案38之傾角亦相對於發光中心軸T而呈線對稱。一個配光控制圖案38係於俯視時具有d=30μm的長度、及e=106μm的寬度，且將偏向反射面38a之傾斜角ε作成45°。另外，任一之配光控制圖案38均以相等之角度Φ=38°傾斜。Next, the result obtained by verifying the light distribution control pattern 38 by simulation will be described. Figures 15 and 16 show models for the simulated planar illumination device. As shown in Fig. 16, the light source 34 is disposed such that the width c of the light radiating surface is 1.8 mm and the gap between the light incident end faces 35 is f = 0.2 mm. The light source 34 is an LED light source that emits white light by a combination of a blue LED and a (yellow) phosphor, and emits light of a Langer distribution from the light source 34. The light distribution control pattern 38 is arranged in a region of a vertical direction a = 1 mm and a horizontal width b = 2 mm, and is disposed at intervals of 0.1 mm (intercenter distance). The light distribution control pattern 38 is arranged in line symmetry with respect to the central axis T of the light emission, and the inclination angle of the light distribution control pattern 38 is also line symmetrical with respect to the central axis T of the light emission. One light distribution control pattern 38 has a length of d = 30 μm and a width of e = 106 μm in plan view, and an inclination angle ε of the deflecting reflection surface 38a is set to 45°. In addition, any of the light distribution control patterns 38 are inclined at an equal angle Φ = 38°.
導光面板33係準備於背面既不設置擴散圖案37、亦不設置配光控制圖案38者、及僅設置配光控制圖案38者。另外，導光面板33之折射率為1.59(聚碳酸酯樹脂之折射率)。任一之導光面板33均不具有擴散圖案37，所以，導光於導光面板33內之光不會從光射出面40射出，而是射達光射入端面35之相反側的端面。如第15(A)及15(B)圖所示，沿與導光面板33之光射入端面35為相反側的端面設置光量測量裝置41，藉由測量射入光量測量裝置41之各位置的光的受光強度，求取各方向上之光的強度(配光分布)。如第15(A)圖所示，光量測量裝置41係配置成相對於與發光中心軸T平行之方向(θ=0°)，可在從配光方向θ=-65°至θ=-65°的範圍內進行測量。The light guide panel 33 is prepared such that the diffusion pattern 37 is not provided on the back surface, and the light distribution control pattern 38 is not provided, and only the light distribution control pattern 38 is provided. Further, the refractive index of the light guiding panel 33 is 1.59 (the refractive index of the polycarbonate resin). Since none of the light guide panels 33 has the diffusion pattern 37, the light guided in the light guide panel 33 is not emitted from the light exit surface 40, but is incident on the end surface on the opposite side of the end surface 35. As shown in Figs. 15(A) and 15(B), the light amount measuring device 41 is disposed along the end surface opposite to the light incident end surface 35 of the light guiding panel 33, by measuring the positions of the incident light amount measuring device 41. The intensity of light received by the light is determined by the intensity of the light in all directions (light distribution). As shown in Fig. 15(A), the light amount measuring device 41 is disposed in a direction parallel to the central axis T of the light emission (θ = 0°), and can be in the light distribution direction θ = -65° to θ = -65 Measurements were made within the range of °.
第17圖顯示使用於背面既不設置擴散圖案37、亦不設置配光控制圖案38的導光面板33，以光量測量裝置41對在導光面板33內被朝各方向導光之光的強度(發光強度)進行測量所得之結果。第17圖之橫軸表示以發光中心軸T為基準之角度(配光方向θ)，縱軸表示各配光方向θ之發光強度。從第17圖之曲線可知，於未設置配光控制圖案38之情況下，於導光面板33內，光源34之正前方的發光強度最大，從配光方向θ=±15°處起，發光強度降低，在與臨界角相等之配光方向θ=±39°附近，發光強度接近於零。又，在比臨界角大之配光方向(|θ|＞39°)，發光強度亦不成為零之理由，可考慮是因為導光面板33內之光的散射或暈光等的因素。Fig. 17 is a view showing the intensity of light guided by the light amount measuring device 41 to the light guided to the respective sides in the light guiding panel 33 by the light guiding panel 33 which is provided with neither the diffusion pattern 37 nor the light distribution control pattern 38 on the back surface. (Luminescence intensity) The result of measurement was performed. The horizontal axis of Fig. 17 indicates the angle (light distribution direction θ) with respect to the central axis T of the light emission, and the vertical axis indicates the luminous intensity of each light distribution direction θ. As can be seen from the graph of Fig. 17, when the light distribution control pattern 38 is not provided, the light intensity of the front side of the light source 34 is the largest in the light guide panel 33, and the light is emitted from the light distribution direction θ = ±15°. The intensity is lowered, and the luminous intensity is close to zero in the vicinity of the light distribution direction θ=±39° which is equal to the critical angle. Further, in the light distribution direction (|θ|>39°) larger than the critical angle, the light emission intensity does not become zero, and it is considered to be a factor such as scattering or blooming of light in the light guide panel 33.
第18圖為顯示使用於背面設置有配光控制圖案38之導光面板33時之亮度變化率的圖。配光方向θ之亮度變化率係指(使用設置有配光控制圖案38之導光面板33時的配光方向θ之發光亮度)÷(使用不具有配光控制圖案38之導光面板33時的相同配光方向θ之發光亮度)。第18圖顯示在比配光控制圖案38之傾角Φ還小的配光方向(|θ|＜Φ=38°)，亮度變化率約為1，但在比配光控制圖案38之傾角Φ還大的配光方向(|θ|＞Φ=38°)，亮度變化率成為遠大於1之值。由此可知，藉由設置配光控制圖案38，可擴展配光分布，可在比配光控制圖案38之傾角Φ還大的配光方向進行光之導光。Fig. 18 is a view showing the rate of change in luminance when the light guide panel 33 provided with the light distribution control pattern 38 on the back surface is used. The luminance change rate in the light distribution direction θ is (the light emission luminance in the light distribution direction θ when the light guide panel 33 of the light distribution control pattern 38 is provided) ÷ (when the light guide panel 33 having the light distribution control pattern 38 is used) The brightness of the same light distribution direction θ). Fig. 18 shows the light distribution direction (|θ| < Φ = 38°) which is smaller than the inclination angle Φ of the light distribution control pattern 38, and the luminance change rate is about 1, but at the inclination angle Φ of the light distribution control pattern 38. The large light distribution direction (|θ|>Φ=38°), the brightness change rate becomes much larger than 1. From this, it is understood that by providing the light distribution control pattern 38, the light distribution can be expanded, and light guiding can be performed in a light distribution direction larger than the inclination angle Φ of the light distribution control pattern 38.
其次，針對本發明之第2實施形態之面狀發光裝置51進行說明，但有關與第1實施形態相同之構成部份，則省略說明。第19圖為示意地顯示第2實施形態之面狀發光裝置51的俯視圖。另外，第20(A)圖為第2實施形態之面狀發光裝置的概略剖視圖，第20(B)圖為第20(A)圖之面狀發光裝置的局部放大圖。Next, the planar light-emitting device 51 according to the second embodiment of the present invention will be described. However, the same components as those of the first embodiment will not be described. Fig. 19 is a plan view schematically showing the planar light-emitting device 51 of the second embodiment. In addition, Fig. 20(A) is a schematic cross-sectional view of the planar light-emitting device of the second embodiment, and Fig. 20(B) is a partially enlarged view of the planar light-emitting device of Fig. 20(A).
第2實施形態之面狀發光裝置51，係於第1實施形態之面狀發光裝置中，進一步以覆蓋光源34及配光控制圖案形成區域之方式，於光源34及導光面板33的上面黏著遮光帶52。遮光帶52係於吸收光之黑色片材53的下面積層由反射光之白色片材或反射鏡片所構成之反射片54，並於反射片54之下面黏貼雙面黏著膠帶55而成者。遮光帶52係藉由雙面黏著膠帶55而被黏著於光源34及導光面板33的上面。In the planar light-emitting device of the first embodiment, the planar light-emitting device 51 of the second embodiment is further adhered to the upper surface of the light source 34 and the light guide panel 33 so as to cover the light source 34 and the light distribution control pattern forming region. Light shielding tape 52. The light-shielding tape 52 is a reflection sheet 54 composed of a white sheet or a reflective sheet that reflects light in a lower area layer of the black sheet 53 that absorbs light, and a double-sided adhesive tape 55 is adhered to the lower surface of the reflection sheet 54. The light shielding tape 52 is adhered to the upper surface of the light source 34 and the light guide panel 33 by the double-sided adhesive tape 55.
根據此種面狀發光裝置51，藉由射片54對不從光源34直接射入光射入端面35而欲從光源34與光射入端面35之間的間隙朝上方漏出之光進行反射，可使該光從光射入端面35射入導光面板33內。藉此，可減低不射入導光面板33內而降低光利用效率之原因所造成的損失光，可提高面狀發光裝置51之亮度效率。According to the planar light-emitting device 51, the light that is to be leaked upward from the gap between the light source 34 and the light incident end surface 35 is not reflected by the radiation sheet 54 by directly entering the light incident end surface 35 from the light source 34. This light can be incident into the light guide panel 33 from the light incident end surface 35. Thereby, it is possible to reduce the loss of light caused by the reason of not reducing the light use efficiency by entering the light guide panel 33, and it is possible to improve the luminance efficiency of the planar light-emitting device 51.
另外，在與配光控制圖案38對向之位置黏貼有反射片54，所以，可防止由配光控制圖案38所反射之光從光射出面40的漏出，可降低光量之減少。Further, since the reflection sheet 54 is adhered to the position opposite to the light distribution control pattern 38, leakage of light reflected by the light distribution control pattern 38 from the light exit surface 40 can be prevented, and the amount of light can be reduced.
又，射入導光面板33內之光，在導光面板33的上面藉由反射片54及雙面黏著膠帶55進行散射反射，所以，可進一步使配光分布均勻化。Further, the light incident on the light guide panel 33 is scattered and reflected by the reflection sheet 54 and the double-sided adhesive tape 55 on the upper surface of the light guide panel 33, so that the light distribution can be further uniformized.
又，配光控制圖案38係除了第11及第14圖所示之形狀以外，還可為各種之形狀。例如，亦可像第21(A)及(B)圖所示之配光控制圖案38那樣，前面38b之傾斜角與偏向反射面38a的傾斜角相等(亦即，γ=ε)，截面形狀為二等邊三角形。於截面為二等邊三角形之配光控制圖案38中，如第22(A)圖所示，亦可使整體彎曲而使偏向反射面38a彎曲成凸曲面狀，如第22(B)圖所示，亦可使整體彎曲而使偏向反射面38a彎曲成凹曲面狀。若使偏向反射面38a彎曲成凸曲面狀時，可使由偏向反射面38a所反射之光進一步擴散。另外，若使偏向反射面38a彎曲成凹曲面狀，則可使由偏向反射面38a所反射之光進行聚光。Further, the light distribution control pattern 38 may have various shapes in addition to the shapes shown in Figs. 11 and 14. For example, as in the light distribution control pattern 38 shown in Figs. 21(A) and (B), the inclination angle of the front surface 38b is equal to the inclination angle of the deflecting reflection surface 38a (i.e., γ = ε), and the sectional shape. It is a second equilateral triangle. In the light distribution control pattern 38 having a two-sided triangular cross section, as shown in Fig. 22(A), the entire deflection can be made to bend the deflecting surface 38a into a convex curved surface, as shown in Fig. 22(B). It is also possible to bend the whole and bend the deflecting surface 38a into a concave curved shape. When the deflecting reflection surface 38a is curved into a convex curved surface, the light reflected by the deflecting reflection surface 38a can be further diffused. Further, when the deflecting reflection surface 38a is curved into a concave curved shape, the light reflected by the deflecting reflection surface 38a can be collected.
另外，如第23(A)～(D)圖所示，配光控制圖案38亦可為鋸齒形圖案、三角錐圖案、四角錐(稜錐體形)圖案、大致圓錐狀圖案等。另外，亦可使這些之各種配光控制圖案38混合。Further, as shown in the 23rd (A) to (D), the light distribution control pattern 38 may be a zigzag pattern, a triangular pyramid pattern, a quadrangular pyramid (pyramidal) pattern, a substantially conical pattern, or the like. Further, these various light distribution control patterns 38 may be mixed.
配光控制圖案38係除了在第1實施形態所作之說明以外，還可為各種之配置，藉此，可更為精密地控制配光分布。又，於第24～第28圖中，將設於導光面板33之背面的配光控制圖案顯示於導光面板33的表面。另一方面，圖中省略擴散圖案37之圖示。The light distribution control pattern 38 can be arranged in various ways in addition to the description of the first embodiment, whereby the light distribution can be controlled more precisely. Moreover, in the 24th to 28th drawings, the light distribution control pattern provided on the back surface of the light guide panel 33 is displayed on the surface of the light guide panel 33. On the other hand, the illustration of the diffusion pattern 37 is omitted in the drawing.
一般而言，像第24(A)圖之面狀發光裝置61那樣，以使光源34與導光面板33之中央對向地配置，配光控制圖案38亦相對於光源34之發光中心軸而左右對稱地設置，以使光在導光面板33之左右均勻地進行配向較為適宜。但是，在顯示區36為左右不對稱之情況、或者設於偏離導光面板33之中央部的位置之情況等，亦可像第24(B)圖之面狀發光裝置62那樣，於偏離導光面板33之中央的位置設置光源34及配光控制圖案38，相對於光源34之發光中心軸呈左右對稱地設置配光控制圖案38。Generally, as in the planar light-emitting device 61 of Fig. 24(A), the light source 34 and the center of the light guide panel 33 are arranged to face each other, and the light distribution control pattern 38 is also opposed to the central axis of the light source 34. It is preferable to provide bilaterally symmetrically so that light is uniformly aligned on the right and left sides of the light guide panel 33. However, in the case where the display region 36 is asymmetrical left-right or at a position deviated from the central portion of the light guide panel 33, the display device 36 may be deflected as in the planar light-emitting device 62 of Fig. 24(B). The light source 34 and the light distribution control pattern 38 are disposed at the center of the light panel 33, and the light distribution control pattern 38 is disposed symmetrically with respect to the light emission center axis of the light source 34.
另外，配光控制圖案38亦可像第25(A)圖之面狀發光裝置63那樣，均勻地分布於配光控制圖案形成區域中，但亦可像第25(B)圖之面狀發光裝置64那樣作隨機分布。Further, the light distribution control pattern 38 may be uniformly distributed in the light distribution control pattern formation region like the planar light-emitting device 63 of Fig. 25(A), but may be illuminated like the surface of Fig. 25(B). The device 64 is randomly distributed as such.
另外，配光控制圖案38亦可像第26圖之面狀發光裝置65那樣，在自光源34所導光之光量多的區域(亦即，與光源34之發光中心軸形成較小之角度的區域)，增大配光控制圖案38之密度，在光量少的區域(亦即，與光源34之發光中心軸形成較大之角度的區域)，減小配光控制圖案38之密度。根據此種配置，可使光量多之方向的光更大範圍地擴散，可減少光量少之方向的光擴散，所以，可在導光面板33整體使光量均勻化。Further, the light distribution control pattern 38 may be formed in a region where the amount of light guided from the light source 34 is large as in the planar light-emitting device 65 of Fig. 26 (i.e., at a small angle with the central axis of the light source 34). In the region, the density of the light distribution control pattern 38 is increased, and the density of the light distribution control pattern 38 is reduced in a region where the amount of light is small (that is, a region where a large angle is formed with the central axis of the light source 34). According to this configuration, light in a direction in which the amount of light is large can be diffused in a wider range, and light diffusion in a direction in which the amount of light is small can be reduced. Therefore, the amount of light can be made uniform in the entire light guide panel 33.
另外，配光控制圖案38亦可像第27圖之面狀發光裝置66那樣，根據位置以使傾角(Φ)不同。Further, the light distribution control pattern 38 may have a different inclination angle (Φ) depending on the position as in the planar light-emitting device 66 of Fig. 27.
另外，配光控制圖案38亦可像第28(A)圖之面狀發光裝置67、第28(B)圖之面狀發光裝置68那樣，於光源34之發光中心軸的一側亦混合傾角不同者。具體而言，於第28(A)圖所示之面狀發光裝置67中，於每一行使配光控制圖案38之旋轉方向反向，於第28(B)圖所示之面狀發光裝置68中，於每一列使配光控制圖案38之旋轉方向反向。Further, the light distribution control pattern 38 may also have a mixed inclination angle on one side of the light-emitting central axis of the light source 34, like the planar light-emitting device 67 of the 28th (A) diagram and the planar light-emitting device 68 of the 28th (B) diagram. Different people. Specifically, in the planar light-emitting device 67 shown in Fig. 28(A), the planar light-emitting device shown in Fig. 28(B) is reversed in the direction in which the light distribution control pattern 38 is rotated. In 68, the rotation direction of the light distribution control pattern 38 is reversed in each column.
另外，配光控制圖案38亦可不是形成在與導光面板33之光射出面40的相反側的面，而是形成在與光射出面40相同的面。同樣，擴散圖案37亦可形成於光射出面40，以使在擴散圖案37被進行散射而穿透之光從光射出面40射出。Further, the light distribution control pattern 38 may not be formed on the surface opposite to the light exit surface 40 of the light guide panel 33, but may be formed on the same surface as the light exit surface 40. Similarly, the diffusion pattern 37 may be formed on the light exit surface 40 such that light diffused by the diffusion pattern 37 to be transmitted and emitted from the light exit surface 40.
於本發明中，藉由這些之配光控制圖案38、或這些之配光控制圖案38的組合，可精密地控制導光面板33內之配光分布。In the present invention, the light distribution distribution in the light guide panel 33 can be precisely controlled by the combination of the light distribution control patterns 38 or the light distribution control patterns 38.
另外，於導光面板33之寬度寬之情況下，亦可使用複數個光源34，於各光源34之附近分別配置配光控制圖案38。Further, when the width of the light guide panel 33 is wide, a plurality of light sources 34 may be used, and the light distribution control pattern 38 may be disposed in the vicinity of each of the light sources 34.
31,51,61～68．．．面狀發光裝置31, 51, 61 ~ 68. . . Planar illuminating device
32．．．基板32. . . Substrate
33．．．導光面板33. . . Light guide panel
34．．．光源34. . . light source
34a．．．LED晶片34a. . . LED chip
35．．．光射入端面35. . . Light injection into the end face
36．．．顯示區36. . . Display area
37．．．擴散圖案37. . . Diffusion pattern
37a．．．反射面37a. . . Reflective surface
37b．．．背面37b. . . back
38．．．配光控制圖案38. . . Light control pattern
38a．．．偏向反射面38a. . . Biased surface
38b．．．前面38b. . . front
39．．．光射入區域39. . . Light injection area
40．．．光射出面40. . . Light exit surface
41．．．光量測量裝置41. . . Light quantity measuring device
52．．．遮光帶52. . . Shading tape
53．．．黑色片材53. . . Black sheet
54．．．反射片54. . . A reflective sheet
55．．．雙面黏著膠帶55. . . Double-sided adhesive tape
B．．．不進行光之導光的區域B. . . Area where light is not guided
T．．．發光中心軸T. . . Luminous central axis
第1圖為示意地顯示習知之面狀發光裝置之俯視圖。Fig. 1 is a plan view schematically showing a conventional planar light-emitting device.
第2圖為沿第1圖中之X-X線所作的概略剖視圖。Fig. 2 is a schematic cross-sectional view taken along the line X-X in Fig. 1.
第3圖為顯示光源已自顯示區離開後的面狀發光裝置之俯視圖。Figure 3 is a plan view showing the planar light-emitting device after the light source has been separated from the display area.
第4圖為顯示面光源裝置之改良例的俯視圖。Fig. 4 is a plan view showing a modified example of the surface light source device.
第5圖為第4圖之面光源裝置之概略剖視圖。Fig. 5 is a schematic cross-sectional view showing the surface light source device of Fig. 4.
第6圖為專利文獻1所揭示之發光面板模組的說明圖。Fig. 6 is an explanatory view of a light-emitting panel module disclosed in Patent Document 1.
第7圖為示意地顯示本發明之第1實施形態之面狀發光裝置的俯視圖。Fig. 7 is a plan view schematically showing a planar light-emitting device according to a first embodiment of the present invention.
第8圖為第1實施形態之面狀發光裝置的概略剖視圖。Fig. 8 is a schematic cross-sectional view showing the planar light-emitting device of the first embodiment.
第9(A)圖為一個擴散圖案之立體圖。第9(B)圖為設於導光面板之背面的該擴散圖案之剖視圖。Figure 9(A) is a perspective view of a diffusion pattern. Fig. 9(B) is a cross-sectional view of the diffusion pattern provided on the back surface of the light guide panel.
第10(A)圖為不同形狀的一個擴散圖案之立體圖。第10(B)圖為設於導光面板之背面的該擴散圖案之剖視圖。Figure 10(A) is a perspective view of a diffusion pattern of different shapes. Fig. 10(B) is a cross-sectional view of the diffusion pattern provided on the back surface of the light guide panel.
第11(A)圖為一個配光控制圖案之立體圖。第11(B)圖為設於導光面板之背面的該配光控制圖案之剖視圖。Figure 11(A) is a perspective view of a light distribution control pattern. Fig. 11(B) is a cross-sectional view of the light distribution control pattern provided on the back surface of the light guide panel.
第12圖為針對配光控制圖案之傾角進行說明的說明圖。Fig. 12 is an explanatory diagram for explaining the inclination of the light distribution control pattern.
第13圖為針對配光控制圖案之作用進行說明的說明圖。Fig. 13 is an explanatory diagram for explaining the action of the light distribution control pattern.
第14(A)及(B)圖為分別具有不同形狀之配光控制圖案的立體圖。Figures 14(A) and (B) are perspective views of light distribution control patterns having different shapes, respectively.
第15(A)圖為用於模擬之面狀發光裝置的俯視圖。第15(B)圖為第15(A)圖之面狀發光裝置的概略剖視圖。Fig. 15(A) is a plan view of the planar light-emitting device for simulation. Fig. 15(B) is a schematic cross-sectional view showing the planar light-emitting device of Fig. 15(A).
第16圖為顯示第15(A)圖之面狀發光裝置的配光控制圖案形成區域之俯視圖。Fig. 16 is a plan view showing a light distribution control pattern forming region of the planar light-emitting device of Fig. 15(A).
第17圖為表示對在背面無圖案之導光面板內的配光分布進行測量之結果的圖。Fig. 17 is a view showing the result of measuring the light distribution in the light guide panel having no pattern on the back surface.
第18圖為表示使用配光控制圖案控制配光分布時之強度變化率的圖。Fig. 18 is a view showing the rate of change in intensity when the light distribution is controlled using the light distribution control pattern.
第19圖為示意地顯示本發明之第2實施形態之面狀發光裝置的俯視圖。Fig. 19 is a plan view schematically showing a planar light-emitting device according to a second embodiment of the present invention.
第20(A)圖為第2實施形態之面狀發光裝置的概略剖視圖。第20(B)圖為第20(A)圖之面狀發光裝置的局部放大圖。Fig. 20(A) is a schematic cross-sectional view showing a planar light-emitting device of a second embodiment. Fig. 20(B) is a partially enlarged view of the planar light-emitting device of Fig. 20(A).
第21(A)圖為不同形狀的一個配光控制圖案之立體圖。第21(B)圖為設於導光面板之背面的該配光控制圖案38之剖視圖。Fig. 21(A) is a perspective view of a light distribution control pattern of different shapes. Fig. 21(B) is a cross-sectional view of the light distribution control pattern 38 provided on the back surface of the light guide panel.
第22(A)及(B)圖為具有其他形狀之各種配光控制圖案的立體圖。Figures 22(A) and (B) are perspective views of various light distribution control patterns having other shapes.
第23(A)～(D)圖為具有再其他形狀之各種配光控制圖案的立體圖。23(A) to (D) are perspective views of various light distribution control patterns having other shapes.
第24(A)圖為顯示配置於導光面板之中央的配光控制圖案之概略俯視圖。第24(B)圖為顯示配置於自導光面板中央偏離的位置之配光控制圖案之概略俯視圖。Fig. 24(A) is a schematic plan view showing a light distribution control pattern disposed at the center of the light guide panel. Fig. 24(B) is a schematic plan view showing a light distribution control pattern disposed at a position deviated from the center of the light guide panel.
第25(A)圖為顯示規則性地分布之配光控制圖案之概略俯視圖。第25(B)圖為顯示隨機分布之配光控制圖案之概略俯視圖。Fig. 25(A) is a schematic plan view showing a light distribution control pattern which is regularly distributed. Fig. 25(B) is a schematic plan view showing a randomly distributed light distribution control pattern.
第26圖為顯示在光量多之區域及光量少之區域使分布方式變化之配光控制圖案的概略俯視圖。Fig. 26 is a schematic plan view showing a light distribution control pattern in which a distribution pattern is changed in a region where the amount of light is large and a region where the amount of light is small.
第27圖為顯示各個傾角不同的配光控制圖案之概略俯視圖。Fig. 27 is a schematic plan view showing a light distribution control pattern having different inclination angles.
第28(A)及(B)圖為顯示分別按照每行或每列而使配光控制圖案的旋轉方向反轉之例子之概略俯視圖。The 28th (A) and (B) are schematic plan views showing an example in which the rotation direction of the light distribution control pattern is reversed for each row or column.
31．．．面狀發光裝置31. . . Planar illuminating device
32．．．基板32. . . Substrate
33．．．導光面板33. . . Light guide panel
34．．．光源34. . . light source
35．．．光射入端面35. . . Light injection into the end face
36．．．顯示區36. . . Display area
37．．．擴散圖案37. . . Diffusion pattern
38．．．配光控制圖案38. . . Light control pattern
39．．．光射入區域39. . . Light injection area
B．．．不進行光之導光的區域B. . . Area where light is not guided
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010224241A JP5267531B2 (en) | 2010-10-01 | 2010-10-01 | Light guide panel |
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| Publication Number | Publication Date |
|---|---|
| TW201229586A TW201229586A (en) | 2012-07-16 |
| TWI479207B true TWI479207B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW100135411A TWI479207B (en) | 2010-10-01 | 2011-09-30 | Light guide panel |
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| Country | Link |
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| JP (1) | JP5267531B2 (en) |
| TW (1) | TWI479207B (en) |
| WO (1) | WO2012042938A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6102919B2 (en) * | 2012-04-27 | 2017-03-29 | 株式会社ニコン | Light guide plate, light source device and electronic apparatus |
| US9568662B2 (en) | 2013-03-15 | 2017-02-14 | Cree, Inc. | Optical waveguide body |
| WO2014145283A1 (en) * | 2013-03-15 | 2014-09-18 | Cree, Inc. | Optical waveguide body |
| US9952372B2 (en) | 2013-03-15 | 2018-04-24 | Cree, Inc. | Luminaire utilizing waveguide |
| JP6380739B2 (en) * | 2014-05-15 | 2018-08-29 | スタンレー電気株式会社 | Surface light source device |
| JP6199915B2 (en) | 2015-02-05 | 2017-09-20 | ミネベアミツミ株式会社 | Surface lighting device |
| JP6523077B2 (en) * | 2015-06-30 | 2019-05-29 | 株式会社エス・ケー・ジー | Light guide plate and display signboard |
| KR102129660B1 (en) * | 2018-05-03 | 2020-07-03 | 황근호 | Side light device controlling light direction and method for implementing Side light device |
| CN110131663A (en) * | 2019-06-10 | 2019-08-16 | 马瑞利汽车零部件(芜湖)有限公司 | Optical system and its car light with squamous illumination effect |
| JP2022122322A (en) * | 2021-02-10 | 2022-08-23 | 株式会社小糸製作所 | Vehicular lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004259688A (en) * | 2003-02-28 | 2004-09-16 | Sanyo Electric Co Ltd | Light guide plate, backlight model, and display device |
| US20070165419A1 (en) * | 2004-02-27 | 2007-07-19 | Minebea Co., Ltd. | Spread illuminating apparatus having light reflecting sheet with light diffusing portions |
-
2010
- 2010-10-01 JP JP2010224241A patent/JP5267531B2/en not_active Expired - Fee Related
-
2011
- 2011-03-22 WO PCT/JP2011/056734 patent/WO2012042938A1/en active Application Filing
- 2011-09-30 TW TW100135411A patent/TWI479207B/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004259688A (en) * | 2003-02-28 | 2004-09-16 | Sanyo Electric Co Ltd | Light guide plate, backlight model, and display device |
| US20070165419A1 (en) * | 2004-02-27 | 2007-07-19 | Minebea Co., Ltd. | Spread illuminating apparatus having light reflecting sheet with light diffusing portions |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012079559A (en) | 2012-04-19 |
| WO2012042938A1 (en) | 2012-04-05 |
| JP5267531B2 (en) | 2013-08-21 |
| TW201229586A (en) | 2012-07-16 |
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