TW201516540A - Planar light generating device - Google Patents

Abstract

A planar light generating device, including a light guide plate module, a light source module, and a filter module, is provided. The light source module, arranged on a side of the light guide plate module, is configured to emit light into the light guide plate module. The filter module is disposed on a light path between the light source and the light guide plate. The filter module includes at least one gradient zone disposed corresponding to the light source module, wherein the gradient zone of the filter module is adjustable to change a relative position to the light source and a spectrum distribution or intensity of the light received by the light guide plate module is then adjusted.

Description

Planar light source generating device

The present invention relates to a planar light source generating device, and more particularly to a planar light source generating device applicable to a side edge light-emitting backlight module.

At present, the backlight module can be divided into two types of backlight modules: Bottom Lighting and Edge Lighting according to the relative positions of the light source and the light-emitting surface. The direct-lit backlight module directly places the light source under the liquid crystal panel, so that the light emitted by the light source is reflected and reflected by the reflective plate. The side-lighting backlight module is configured to set the light source on the edge of the backlight module. When the light emitted by the light source enters the light guide plate, the light can be guided to the light guide plate by the printed dot or microstructure at the bottom of the light guide plate. The light side. The light source used in the above-mentioned direct-lit backlight module or the side-lit backlight module can be generally divided into two types: a light-emitting diode (LED) and a cold cathode light bulb (CCFL). The light-emitting diode can be further divided into two types: red green blue (RGB) LED and white light LED.

However, the white LEDs produced in different batch processes have slightly different brightness or chromaticity, and even the white LEDs produced in the same batch process have more or less the above problems. Therefore, if the light source module includes a plurality of white LEDs of different brightness or chromaticity, it will be difficult to control the quality of the backlight module and the brightness. In addition, for the conventional backlight module, when a plurality of white LEDs in the backlight module are assembled, the chromaticity and brightness of the backlight module cannot be changed.

In view of this, it is necessary to propose a new backlight module to solve multiple whites. The difference in chromaticity and brightness caused by light LEDs.

The invention provides a planar light source generating device for achieving dynamic adjustment of the chromaticity and/or brightness of the backlight module.

To achieve the above advantages or other advantages, an embodiment of the present invention provides a planar light source generating device, including: a light guide plate module, a light source module, and a filter module. The light source module is disposed on one side of the light guide plate module, and the light source module is adapted to emit light to enter the light guide plate module. The filter module is disposed on a path of the light emitted by the light source module into the light guide plate module. The position of the corresponding light source module in the filter module is provided with at least one gradation zone, wherein the relative position of the gradation zone and the light source module can be changed to adjust the spectrum of the light entering the light guide plate module. Distribution or strength.

In an embodiment of the invention, the light guide plate module comprises a light guide plate main body, an optical dot pattern structure, a bottom reflection sheet, a diffusion sheet and a cymbal sheet. The light guide plate body has a first surface and a second surface. The optical dot pattern structure is completed on the first surface for reflecting light entering the light guide body to pass through from the second surface. The bottom reflective sheet is completed on one side of the first surface for reflecting light passing through the main body of the light guide plate back into the main body of the light guide plate. The diffusion sheet and the cymbal are respectively completed on one side of the second surface.

In an embodiment of the invention, the light guide plate module further includes a top reflective sheet, which is disposed on one side of the second surface and adjacent to the light source module for reflecting light emitted from the light source module and causing reflection The light enters the light guide body from the second surface.

In an embodiment of the invention, the filter module is disposed between the top reflective sheet and the light guide body.

In an embodiment of the invention, the filter module is disposed between the light source module and the light guide body.

In an embodiment of the invention, the filter module includes chroma filtering a light sheet and/or a brightness filter, wherein the chromaticity filter is provided with a chromatic gradient layer, and the chromatic gradient layer comprises a plurality of transparent regions of different colors for adjusting into the light guide plate module. The spectral distribution of the light; the brightness filter has a brightness gradation area, and the brightness gradation area includes a plurality of light transmission areas of different transmittances for adjusting the intensity of light entering the light guide module.

In an embodiment of the invention, the chromatic gradient region exhibits a yellow-white-blue gradient distribution, and the luminance gradation region exhibits a black-and-white gradient distribution.

In an embodiment of the present invention, the planar light source generating device further includes a receiving frame for accommodating the light guide plate module, the light source module and the filter module, wherein the receiving frame includes at least one through hole and At least one filter scale mark. The through hole is formed on one side of the accommodating frame corresponding to the light source module. The filter mark marks are located on one side of the through hole, and one end of the chromaticity filter and/or the brightness filter passes through the through hole and moves in a specific direction by adjusting the chromaticity filter and/or the brightness filter. The position of the end of the sheet on the scale mark of the filter further changes the relative position between the brightness gradation area and/or the chromaticity near layer area and the light source module.

In an embodiment of the invention, the light source module includes a circuit board disposed on one side of the light source module and a plurality of point light sources disposed on the circuit board.

In an embodiment of the invention, the point source is a plurality of white light emitting diodes.

In an embodiment of the invention, the light source module includes a circuit board disposed on one side of the light source module and a plurality of line light sources disposed on the circuit board.

In an embodiment of the invention, the line source is a cold cathode tube

In summary, the planar light source generating device of the present invention is configured to provide a filter module having a gradation zone on a path of light emitted by the light source module into the light guide plate module, and by changing the gradient The relative position between the area and the light source module, thereby adjusting the spectral distribution or intensity of the light entering the light guide plate module. This will easily control the chromaticity and brightness of the backlight module.

The above and other objects, features and advantages of the present invention will become more apparent and obvious. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the preferred embodiments will be described in detail with reference to the accompanying drawings.

100,400‧‧‧planar light source generating device

110,410‧‧‧Light guide plate module

111‧‧‧Light guide body

112‧‧‧Optical dot pattern structure

113‧‧‧ bottom reflector

115‧‧‧Diffuser

116‧‧‧ Picture

120, 120a‧‧‧ light source module

121, 122, 123, 124, 125a, 125b‧‧‧ white light emitting diode

130, 612‧‧‧ Filter Module

130a, 130b, 130c‧‧‧ Chroma Filter

130P‧‧‧Endpoint

132‧‧‧Brightness filter

140‧‧‧ boards

190, 690‧‧‧ 容 框

192, 196‧‧‧ through holes

194, 6124‧‧‧ filter scale marks

412‧‧‧ top reflector

6122‧‧‧Rotary filter

6126‧‧‧ filter alignment line

L1‧‧‧Light

Z1, Z2, Z3, Z4, Z5, Z6‧‧‧ chromatic gradient zone

Z21, Z22, Z23, Z24‧‧‧ brightness gradient zone

S1‧‧‧ first surface

S2‧‧‧ second surface

D1‧‧ Direction

1A is a cross-sectional view showing a planar light source generating apparatus according to an embodiment of the present invention.

1B is a top view of the light guide plate main body, the filter module, and the light source module in the planar light source generating device of FIG. 1A.

1C is a side view of the filter module with a gradation zone of FIG. 1B and a relative position of the gradation zone in the light source module and the filter module.

1D is a side view of a filter module having a gradation zone and a relative positional view of a gradation zone in a light source module and a filter module according to another embodiment of the present invention.

1E is a side view of a filter module having a gradation zone and a relative positional view of a gradation zone in a light source module and a filter module according to another embodiment of the present invention.

2 is a side view of a filter module having a gradation zone according to another embodiment of the present invention, and a relative positional view of a gradation zone in the light source module and the filter module.

3 is a side view of a filter module having a chromaticity filter and a brightness filter according to another embodiment of the present invention and a relative positional view with a gradation zone in the filter module.

4 is a cross-sectional view showing a planar light source generating device according to another embodiment of the present invention.

Figure 5A is a perspective exploded view of the planar light source generating device of Figure 1A of the present invention.

Fig. 5B is a perspective assembled view of the planar light source generating device of Fig. 5A of the present invention.

5C is a perspective assembled view of the planar light source generating device of FIG. 5B after removing the light guide plate module of the present invention.

6 is a perspective assembled view of a planar light source generating device after removing a light guide plate module according to another embodiment of the present invention.

1A is a cross-sectional view showing a planar light source generating apparatus according to an embodiment of the present invention. 1B is a top view of the light guide plate main body, the filter module, and the light source module in the planar light source generating device of FIG. 1A. 1C is a side view of the filter module with a gradation zone of FIG. 1B and a relative position of the gradation zone in the light source module and the filter module. Please refer to FIG. 1A to FIG. 1C in combination. The planar light source generating device 100 of the present invention comprises a light guide plate module 110, a light source module 120, a filter module 130 and a receiving frame 190. The light source module 120 is disposed on one side of the light guide plate module 110, and the light source module 120 is adapted to emit light L1 into the light guide plate module 110. The filter module 130 is disposed on the path of the light L1 emitted by the light source module 120 into the light guide plate module 110. The position of the corresponding light source module 120 in the filter module 130 is provided with at least one gradation zone, such as the chromatic gradient zone Z1. The spectral distribution or intensity of the light entering the light guide plate module 110 can be adjusted by changing the relative position between the chromatic gradient zone Z1 and the light source module 120. The above-mentioned accommodating frame 190 will be explained in the following FIGS. 5A to 5B.

Please continue to refer to Figure 1A. The light guide plate module 110 includes a light guide plate main body 111, an optical dot pattern structure 112, a bottom reflection sheet 113, a diffusion sheet 115, and a cymbal 116. The light guide plate main body 111 has a first surface S1 and a second surface S2. The optical dot pattern structure 112 described above is completed on the first surface S1. When the light ray L1 enters the light guide plate main body 111, total reflection is performed in the light guide plate main body 111. The optical dot pattern structure 112 is used to destroy the total reflection of the light L1 in the light guide body 111 so that the light L1 can be reflected and passed out of the second surface S2. In addition, the bottom reflection sheet 113 is disposed on one side of the first surface S1 for reflecting the light passing through the light guide main body 111 back into the light guide main body 111. In addition, the diffusion sheet 115 and the cymbal sheet 116 are sequentially disposed on one side of the second surface S2, wherein the diffusion sheet 115 is configured to diffuse the light L1 passing through the light guide plate main body 111 more uniformly, and the cymbal 116 It is used to concentrate light to increase the brightness of the module.

Please continue to refer to FIG. 1A and refer to FIG. 1B in combination. The light source module 120 includes a circuit board 140 and a plurality of point light sources. The circuit board 140 is disposed on one side of the light source module 120. The plurality of point light sources are, for example, a plurality of white light emitting diodes 121 and 122, 123, 124, and at least one white LED corresponds to a gradation zone. In FIG. 1B, four white LEDs 121, 122, 123, and 124 respectively correspond to four chrominance gradation zones Z1, Z2, Z3, and Z4, but the invention is not limited thereto.

Please continue to refer to Figure 1C. The filter module 130 includes, for example, a chromaticity filter and/or a brightness filter. In FIG. 1C, the filter module 130 includes a chromaticity filter 130a as an illustrative example. The chromaticity filter 130a is provided with at least one chrominance gradation area. In FIG. 1C, the chromaticity filter 130a includes four chrominance gradation areas Z1, Z2, Z3, and Z4 as examples. The invention is not limited thereto. The chromatic gradient zones Z1, Z2, Z3, and Z4 include a plurality of transparent regions of different colors for adjusting the spectral distribution of light entering the light guide panel module 110. In addition, each of the chromatic gradient zones Z1, Z2, Z3, and Z4 described above exhibits a yellow-white-blue gradient distribution, as shown in FIG. 1C. The invention adjusts the relative positions of the chromatic gradient zones Z1, Z2, Z3, Z4 and the white LEDs 121, 122, 123, 124 in the chromaticity filter 130a so that the white LEDs 121, 122, 123, 124 emit The white light enters the chromic gradation zone so that the white light's luminescence spectrum can be dynamically fine-tuned to achieve the desired white chromaticity specification. It is worth mentioning that the dynamic moving direction of the above-described chromaticity filter 130a is, for example, parallel to the color gradation direction of the chromogenic gradation areas Z1, Z2, Z3, and Z4.

1D is a side view of a filter module having a gradation zone and a relative positional view of a gradation zone in a light source module and a filter module according to another embodiment of the present invention. Please refer to FIG. 1D. The filter module of the present invention may include, for example, a chrominance gradient zone Z5, in addition to the chromaticity filter 130a including a plurality of chrominance gradation zones. The chromaticity filter 130b, wherein the chromatic gradient zone Z5 corresponds to a plurality of white LEDs 121, 122, 123, 124 in the light source module 120. And the dynamic moving direction of the chromaticity filter 130b is, for example, parallel to the color gradation direction of the chromaticity filter 130b. It is worth mentioning that if the light source module comprises a circuit board and a line light source (for example, a cold cathode lamp), and the plurality of white LEDs are replaced by a cold cathode lamp, the above only includes a chromatic gradient zone Z5. Chromatic filter 130b, can also be It is disposed between the cold cathode lamp tube (not shown) and the light guide plate module.

1E is a side view of a filter module having a gradation zone and a relative positional view of a gradation zone in a light source module and a filter module according to another embodiment of the present invention. Please refer to FIG. 1E. If the light source module 120a includes two sets of white LEDs of different chromaticity specifications, for example, a white LED 125a that needs to perform white light spectrum adjustment and a white LED 125b that does not need to be spectrally adjusted, the position of the chromaticity filter 130c relative to the white LED 125a needs to be set. The gradation zone Z6, and the position of the chromaticity filter 130c relative to the white LED 125b, does not require the gradation zone. Therefore, the chroma filter of the present invention can design the position of the gradation zone to be set according to the spectral distribution of the plurality of white LEDs in the light source module.

2 is a side view of a filter module having a gradation zone according to another embodiment of the present invention, and a relative positional view of a gradation zone in the light source module and the filter module. Please refer to Figure 2. The above-described filter module 130 of the present invention is, for example, a brightness filter 132. The brightness filter 132 is provided with at least one brightness gradation area, and the brightness gradation area includes a plurality of light transmission areas of different transmittances, which can be used to adjust the intensity of the light entering the light guide plate module 110. In FIG. 2, the brightness filter 132 includes four brightness gradation areas Z21, Z22, Z23, and Z24, and corresponding to the four white LEDs 121, 122, 123, and 124 in the light source module 120, respectively. However, the invention is not limited thereto. Further, each of the above-described luminance gradation regions Z21, Z22, Z23, and Z24 respectively exhibits a black and white gradation distribution, for example. Therefore, if the original white light emitted by the white LEDs 121, 122, 123, 124 is too bright, the luminance filter 132 can be moved to facilitate the lower transmittance of the luminance gradient regions Z21, Z22, Z23, and Z24. The area (the area where the color is black) corresponds to the white LEDs 121, 122, 123, and 124.

3 is a side view of a filter module having a chromaticity filter and a brightness filter according to another embodiment of the present invention and a relative positional view with a gradation zone in the filter module. Please refer to Figure 3. The above-described filter module 130 of the present invention includes, for example, a chromaticity filter 130a and a luminance filter 132. In FIG. 3, the light source module 120 has four white LEDs 121, 122, 123, and 124 corresponding to four chrominance zones Z1, Z2, and Z3, respectively. Z4 and four luminance gradation zones Z21, Z22, Z23, and Z24 are examples of explanation. It is worth mentioning that the brightness of the emitted light is also reduced when the light passes through the chromaticity filter 130a. Therefore, the preferred arrangement of the brightness filter 132 and the chromaticity filter 130a is such that the darker areas of the gradation areas Z21, Z22, Z23, and Z24 correspond to the gradation areas Z1, Z2, and Z3. The yellow area in Z4 can prevent the light emitted by the light source module 120 from excessively reducing the brightness of the emitted light after passing through the chromaticity filter and the brightness filter.

4 is a cross-sectional view showing a planar light source generating device according to another embodiment of the present invention. Please refer to FIG. 4 and FIG. 1A in combination. In addition to all the components and structures of the planar light source generating device 100, the planar light source generating device 400 of the present embodiment further includes a top reflecting sheet 412. The top reflective sheet 412 is completed on one side of the second surface S2 of the light guide plate module 410 and is adjacent to the light source module 120. The top reflective sheet 412 is configured to reflect light emitted from the light source module 120 and cause the reflected light to enter the light guide body 111 from the second surface S2. In this way, the light emitted by the light source module 120 can be prevented from being directly emitted from the light source module 120 to the diffusion sheet 115 before entering the light guide plate main body 111 for conversion of the surface light source. Therefore, in the planar light source generating device 400, the filter module 130 may be disposed between the light source module 120 and the light guide plate main body 111, or may be disposed between the top reflective sheet 412 and the light guide plate main body 111. In addition, it is worth mentioning that, if the light emitted by the light source module 120 is likely to be emitted to the circuit board 140 below the light source module 120, the filter module 130 may be disposed on the circuit board 140, for example. Between the light source modules 120.

The above description has been made in explaining the structure of the planar light source generating device of the present invention from a plan sectional view and a plan top view of the planar light source generating device. In the following, a more detailed structural description will be made using the three-dimensional assembled view and the exploded view of the planar light source generating device.

Figure 5A is a perspective exploded view of the planar light source generating device of Figure 1A of the present invention. Fig. 5B is a perspective assembled view of the planar light source generating device of Fig. 5A of the present invention. 5C is a perspective view of the planar light source generating device of FIG. 5B after removing the light guide plate module of the present invention; Assembly drawing. Please refer to Figure 5A first. The planar light source generating device 100 of the present invention comprises a light guide plate module 110, a light source module 120, a filter module 130 and a receiving frame 190. The accommodating frame 190 is configured to receive the light guide plate module 110, the light source module 120, and the filter module 130. The accommodating frame 190 includes at least one through hole and at least one filter scale mark 194. The through holes 192 and 196 are exemplified in FIG. 5A. The through holes 192 and 196 are formed on one side and the opposite side of the accommodating frame 190 corresponding to the light source module 120, and the filter scale marks 194 are located on one side of the through hole 192, but another filter scale may be disposed. Traced on one side of the through hole 196. One end 130P of the filter module 130 passes through the through hole 192, and the other end (not shown) of the filter module 130 passes through the through hole 196, and the filter module 130 is oriented in a specific direction. The D1 moves to adjust the relative position between the filter module 130 and the light source module 120 by adjusting the position of the end 130P of the filter module 130 to the position of the filter scale mark 194. Referring to FIG. 5B and FIG. 5C, a schematic diagram of the planar light source generating device 100 of the present invention after assembly is shown. FIG. 5C is a schematic diagram of the light guide plate module 110 in FIG. 5B. The relative arrangement relationship between the filter module 130 and the light source module 120 can be more clearly seen. As can be seen from FIG. 5B and FIG. 5C, the filter scale marks 194 are scaled with different degrees of gradation of the color, and the filter scale marks are designed with respect to the distribution pattern of the gradation areas in the filter module 130. 194, in order to adjust different colors or different colors in the gradation area of the filter module 130 by moving the position of the different gradient colors of the end 130P of the filter module 130 to the filter scale mark 194. The relative position of the light-transmitting region of the light transmittance to the light source module 120. It should be noted that the manner in which the filter module 130 is temporarily fixed to the filter scale mark 194 is, for example, a pasting manner.

6 is a perspective assembled view of a planar light source generating device after removing a light guide plate module according to another embodiment of the present invention. In the foregoing embodiment, the filter modules all exhibit the shape of the filter in a planar strip manner. In the present embodiment, the filter module 612 is disposed on one side of the accommodating frame 690 and disposed above the light source module 120. The accommodating frame 690 does not have the above-mentioned through hole. The filter module 612 includes a rotary filter 6122 With the filter scale marks 6124, as shown in Figure 6. The rotating filter 6122 is, for example, a chromaticity filter or a brightness filter, which is a scale with different degrees of gradation, and the gradation direction D1 is perpendicular to each point source in the light source module 120. The configuration extends the direction. The rotary filter 6122 surrounds the filter scale mark 6124, and the edge of the rotary filter 6122 has a filter alignment line 6126. Thus, when the rotary filter 6122 is rotated, the different gradient regions of the filter scale marks 6124 corresponding to the bit line 6126 of the filter are obtained, and the rotary filter 6122 is further adjusted and further adjusted. The relative position of the gradation zone of the different colors or different transmittances to the light source module 120.

In summary, the planar light source generating device of the present invention is configured to provide a filter module having a gradation zone on a path of light emitted by the light source module into the light guide plate module, and by changing the gradient The relative position between the area and the light source module, thereby adjusting the spectral distribution or intensity of the light entering the light guide plate module. This will easily control the chromaticity and brightness of the backlight module.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100‧‧‧ planar light source generating device

110‧‧‧Light guide plate module

111‧‧‧Light guide body

112‧‧‧Optical dot pattern structure

113‧‧‧ bottom reflector

115‧‧‧Diffuser

116‧‧‧ Picture

120‧‧‧Light source module

130‧‧‧Filter Module

140‧‧‧ boards

190‧‧‧ accommodating frame

L1‧‧‧Light

S1‧‧‧ first surface

S2‧‧‧ second surface

Claims (12)

A planar light source generating device, comprising: a light guide plate module; a light source module disposed on one side of the light guide plate module, the light emitted by the light source module enters the light guide plate module; and a filter The film module is disposed on the path of the light emitted by the light source module into the light guide plate module, wherein the filter module is provided with at least one gradation zone corresponding to the position of the light source module, and the gradation layer The relative position of the area and the light source module can be changed to adjust the spectral distribution or intensity of the light entering the light guide plate module. The planar light source generating device of claim 1, wherein the light guide plate module comprises: a light guide plate body having a first surface and a second surface; and an optical dot pattern structure completed at the first a surface for reflecting light entering the main body of the light guide plate to pass through from the second surface; and a bottom reflective sheet completed on one side of the first surface for passing through the main body of the light guide plate The light is reflected back into the main body of the light guide plate; a diffusion sheet is completed on one side of the second surface; and a gusset is completed on one side of the second surface. The planar light source generating device of claim 2, wherein the light guide plate module further comprises a top reflective sheet, which is disposed on one side of the second surface and adjacent to the light source module for reflecting from the light source The light emitted by the module causes the reflected light to enter the light guide body from the second surface. The planar light source generating device of claim 2, wherein the filter module is disposed between the top reflective sheet and the light guide plate body. The planar light source generating device of claim 1, wherein the filter module is disposed between the light source module and the light guide plate body. The planar light source generating device of claim 1, wherein the filter module comprises: a chromaticity filter and/or a brightness filter, wherein the chromaticity filter is provided with a chromaticity a layer region, the chromaticity gradation region includes a plurality of transparent regions of different colors for adjusting a spectral distribution of light entering the light guide plate module, wherein the brightness filter is provided with a brightness gradation region, The brightness gradation zone includes a plurality of light transmissive regions of different transmittances for adjusting the intensity of light entering the light guide module. The planar light source generating device according to claim 6, wherein the chromatic gradient region exhibits a yellow-white-blue gradient distribution, and the luminance gradation region exhibits a black-and-white gradient distribution. The planar light source generating device of claim 6, further comprising a receiving frame for accommodating the light guide plate module, the light source module and the filter module, wherein the receiving frame comprises : at least one through hole, the through hole is formed on one side of the receiving frame corresponding to the light source module, and at least one filter mark mark is located on one side of the through hole, the chromaticity filter and/or Or one end of the brightness filter passes through the through hole and moves in a specific direction, by adjusting the position of the chromaticity filter and/or the end of the brightness filter on the mark mark of the filter And changing the relative position between the brightness gradation area and/or the chromaticity near layer area and the light source module. The planar light source generating device of claim 1, wherein the light source module comprises: a circuit board disposed on one side of the light source module; and a plurality of point light sources disposed on the circuit board. The planar light source generating device of claim 9, wherein the point light sources are a plurality of white light emitting diodes. The planar light source generating device of claim 1, wherein the light source module comprises: a circuit board disposed on one side of the light source module; and a line light source disposed on the circuit board. The planar light source generating device of claim 11, wherein the line source is a cold cathode lamp.