Display device

Abstract

SOLUTION: A display device includes a light source, a grid structure, and a photointerrupter. The grid structure is positioned on the light source and can be moved left and right relative to the light source. When the grid structure does not block the photointerrupter, the light source receives a first signal, and when the grid structure blocks the photointerrupter, the light source receives a second signal.EFFECT: To improve the conventional problem of difference in images viewed from different angles on a display screen.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a display device capable of multi-angle viewing.

Background Art

[0002] With the rapid development of technology, the technological progress of outdoor displays provides a wide range of options for outdoor advertising, event venues, traffic signs, etc. It also provides a better experience for obtaining information and enjoying entertainment in outdoor environments. The development of outdoor displays particularly depends on the progress of Light Emitting Diode (LED) technology. Outdoor displays become bright and clear by using light emitting diodes. Furthermore, various viewing angle technologies are applied to outdoor displays. With advanced LED and display technologies, outdoor displays provide a wider viewing angle and enable uniform display even when viewers look from various angles.

[0003] However, since LEDs are surface light sources, generally, the light distribution is strong in the central part and weak on both sides. Due to this non-uniform light distribution, when an observer views a display screen using an LED as a light source from a long distance, the appearance varies depending on the viewing angle. The brightness of the image seen by the observer in the normal direction of the display screen is strong, but the brightness of the image seen by the observer from the side of the display screen becomes dark. In order to overcome the above problems, developing an innovative display device that can improve the conventional problem of image differences such as uneven brightness and chromaticity due to differences in viewing angles in a display screen has become an urgent issue in the industry.

Summary of the Invention

[0004] The main object of the present invention is to provide an innovative display device that can improve problems of image differences such as uneven brightness and chromaticity due to differences in viewing angles in a conventional display screen using an LED as a light source.

[0005] To achieve the above object, the present invention provides a display device including a light source, a lattice structure, and a photointerrupter. The lattice structure is disposed above the light source and can move left and right with respect to the light source. When the lattice structure does not block the photointerrupter, the light source receives a first signal, and when the lattice structure blocks the photointerrupter, the light source receives a second signal.

[0006] In an embodiment of the present invention, the intensity of the second signal is greater than the intensity of the first signal.

[0007] In an embodiment of the present invention, the luminance of the light passing through the central region of the lattice structure when the light source receives the first signal is substantially equal to the luminance of the light passing through the regions on both sides of the lattice structure when the light source receives the second signal.

[0008] In an embodiment of the present invention, the display device further includes a controller and a driver. When the lattice structure does not block the photointerrupter, after receiving the signal of the photointerrupter, the controller controls the driver to output the first signal to the light source. When the lattice structure blocks the photointerrupter, after receiving the signal of the photointerrupter, the controller controls the driver to output the second signal to the light source.

[0009] In an embodiment of the present invention, the display device further includes a circuit board, and the light source has a plurality of light-emitting units disposed on the circuit board.

[0010] In an embodiment of the present invention, each light-emitting unit includes a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0011] In an embodiment of the present invention, the photointerrupter is disposed on the circuit board, and when the lattice structure moves left and right, it covers or does not cover the photointerrupter.

[0012] In an embodiment of the present invention, the lattice structure includes a plurality of lattice units. Each lattice unit has a left lattice and a right lattice. The left lattice and the right lattice are arranged at intervals. When the lattice structure does not block the photointerrupter, the light of each light-emitting unit passes through the interval between the left lattice and the right lattice of the lattice unit above it. When the lattice structure blocks the photointerrupter, the light of each light-emitting unit passes through the regions on both sides of the left lattice and the right lattice of the lattice unit above it.

[0013] In an embodiment of the present invention, in each lattice unit, the lattice widths of the left lattice and the right lattice are about 0.5 to 20 times the characteristic size of the light-emitting unit. The characteristic size is the effective diameter or the effective side length of the light-emitting unit.

[0014] In an embodiment of the present invention, the distance between each lattice unit and the circuit board is about 1 to 20 times the lattice width of the left lattice and the right lattice in each lattice unit.

[0015] In an embodiment of the present invention, when the horizontal width of the display device is 5 times or more the distance between the display device and the observer, the first signal and the second signal are made different signals corresponding to the left eye and the right eye of the observer, thereby performing three-dimensional display for the observer.

[0016] Those skilled in the art can understand other objects of the present invention, as well as the technical means and embodiments of the present invention, by referring to the drawings and the embodiments described below.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7

Mode for Carrying Out the Invention

[0018] Hereinafter, the content of the present invention will be described through examples. Note that the examples of the present invention show examples of embodiments and are not intended to be limited to the environments, applications, or specific aspects as described in the examples. Therefore, the description of the examples is for explaining the present invention but does not limit the present invention. In the embodiments and the drawings, components not directly related to the present invention are omitted and not shown. The dimensional relationships of the components in the drawings are for facilitating understanding and do not limit the actual dimensions.

[0019] FIG. 1 is a schematic diagram showing the structure of a display device in an embodiment of the present invention. As shown in FIG. 1, in this embodiment, the display device 1 includes a light source 10, a lattice structure 20, a photointerrupter 30, and a circuit board 40. The light source 10 has a plurality of light emitting units 100. The light emitting units 100 are arranged on the circuit board 40 at intervals in a matrix. The lattice structure 20 is arranged above the light source 10 and can move left and right with respect to the light source 10. Note that the photointerrupter 30 is arranged on the circuit board 40. When the lattice structure 20 moves left and right with respect to the light source 10, it covers or does not cover the photointerrupter 30. The photointerrupter 30 adjusts the output of the light source 10 by transmitting different signals corresponding to different shielding states. Thereby, the problem of luminance non-uniformity due to the difference in viewing angle in the conventional display screen can be improved.

[0020] In a preferred embodiment, each light-emitting unit 100 includes, but is not limited to, a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode. In FIG. 1, for the sake of simplicity of the figure, the light-emitting diodes of different colors in each light-emitting unit are not specifically shown, and each light-emitting unit 100 is shown by a dotted circle. The dotted circle indicates that the light-emitting unit 100 is disposed under the lattice structure 20. This will be described with reference to FIGS. 1 and 2. FIG. 2 is a cross-sectional view along line A-A' within the rectangular dotted-line region of FIG. 1. FIG. 2 shows the three-dimensional spatial relationship of the light source, the lattice structure, and the circuit board in the display device of the present invention. As shown in FIG. 2, specifically, the lattice structure 20 of the present invention has a plurality of lattice units 200 and a plurality of lateral lattices 202. Each lattice unit 200 includes a left lattice 210 and a right lattice 220. The left lattice 210 and the right lattice 220 are arranged at intervals. Each lattice unit 200 is fixed by a plurality of lateral lattices 202 so that the lattice structure 20 can move left and right with respect to the light source 10. The lateral lattice 202 blocks the upward light emitted from each light-emitting unit 100 to avoid light damage to the sky when the display device 1 is installed outdoors. Specifically, each lattice unit 200 is disposed above the circuit board 40 at a predetermined distance from the circuit board 40. The light-emitting unit 100 is located between the lattice unit 200 and the circuit board 40. As shown in FIG. 2, the left lattice 210 and the right lattice 220 of the lattice unit 200 are respectively disposed above the light-emitting unit 100 provided on the circuit board 40. When the left lattice 210 and the right lattice 220 reciprocate left and right with respect to the light-emitting unit 100, the light from the light-emitting unit 100 may pass only through the interval between the left lattice 210 and the right lattice 220, or may pass only through the regions on both sides of the left lattice 210 and the right lattice 220. In a preferred embodiment, the distance between each lattice unit 200 and the circuit board 40 is about 1 to 20 times the lattice width of the left lattice 210 and the right lattice 220. The lattice width of the left lattice and the right lattice is about 0.5 to 20 times the characteristic size of the light-emitting unit. Here, the characteristic size is the effective diameter or the effective side length of the light-emitting unit.

[0021] Also, the numbers of the light emitting units and the grating units shown in the figures are merely illustrative, and the present invention is not limited thereto. The description will be made with reference to FIGS. 1, 2, 3, and 4. FIGS. 1 and 2 show the spatial relationship between the light emitting unit 100, the left grating 210, and the right grating 220 in a state where the photointerrupter 30 is not blocked by any of the grating units 200 of the grating structure 20. On the other hand, FIGS. 3 and 4 show the spatial relationship between the light emitting unit 100, the left grating 210, and the right grating 220 in a state where the photointerrupter 30 is blocked by one of the grating units 200 of the grating structure 20. Similar to FIG. 2, FIG. 4 is a cross-sectional view along line A-A' within the rectangular dotted line area of FIG. 3 when the photointerrupter 30 is blocked.

[0022] Specifically, as shown in FIGS. 1 and 2, when the photointerrupter 30 is not blocked by any of the grating units 200 of the grating structure 20, the photointerrupter 30 transmits a voltage signal to a controller (not shown) of the display device. When the controller receives the voltage signal when the photointerrupter 30 is not blocked, the controller outputs a signal to a driver (not shown) and controls the driver to output a first signal. The first signal is received by each light emitting unit 100 of the light source 10. In this case, the spatial relationship between the light emitting unit 100 and the grating structure 20 is as shown in FIGS. 1 and 2. The normal direction of the center of the light emitting unit 100 is exactly the direction toward the interval between the left grating 210 and the right grating 220. As a result, most of the light emitted from the normal direction of the light emitting unit 100 is emitted to the outside through the interval between the left grating 210 and the right grating 220. Most of the light radiated laterally by the light emitting unit 100 is blocked by the grating unit.

[0023] On the one hand, as shown in FIGS. 3 and 4, when the photointerrupter 30 is blocked by one lattice unit 200 of the lattice structure 20, the voltage signal received by the controller from the photointerrupter drops significantly and becomes substantially zero. In this case, the controller can determine that the photointerrupter is blocked. The controller outputs a signal different from the said signal to the driver and controls the driver to output a second signal. The second signal is received by each light-emitting unit 100 of the light source 10. In this case, the spatial relationship between the light-emitting unit 100 and the lattice structure 20 is as shown in FIGS. 3 and 4. The center of the light-emitting unit 100 is exactly blocked by one of the left lattice 210 and the right lattice 220. Most of the light radiated from the normal direction of the light-emitting unit 100 is blocked. Most of the light emitted by the light-emitting unit 100 to both sides will pass through the areas on both sides of the left lattice 210 and the right lattice 220 and be emitted to the outside.

[0024] One of the features of the present invention is that the first signal and the second signal received by the light source can be dynamically adjusted. The present invention can improve problems of image differences such as uneven luminance and chromaticity due to differences in the viewing angles of distant observers in a conventional display screen using LEDs as the light source. This will be described with reference to FIG. 5. In FIG. 5, the vertical coordinate of signal A represents voltage and the horizontal coordinate represents time. The waveform of signal A indicates that different voltage signals are output according to the blocking state of the photointerrupter. As described above, when the photointerrupter is blocked by the lattice structure, the voltage signal transmitted from the photointerrupter to the controller is substantially close to zero. Conversely, when the photointerrupter is not blocked by the lattice structure, the photointerrupter transmits a predetermined voltage signal to the controller. When the lattice structure moves back and forth left and right, the photointerrupter transmits a rectangular wave signal as shown in signal A to the controller.

[0025] When the controller receives signal A from the photointerrupter, it can determine whether the photointerrupter is blocked or not. Specifically, when the signal A received by the controller is a predetermined voltage signal that is not zero, the controller determines that the photointerrupter is not blocked by the lattice structure, and the driver outputs a first signal to the light source. Figure 5 shows the waveform of the first signal. In Figure 5, the vertical axis of the first signal indicates current, and the horizontal axis indicates time. The waveform of the first signal is a rectangular wave in phase with signal A. In this case, the spatial relationship between the lattice structure and the light source is as shown in Figures 1 and 2. The light-emitting unit 100 emits light after receiving the first signal. Most of the light is emitted to the outside through the gap between the left lattice 210 and the right lattice 220. After measurement, the light distribution curve is as shown in Figure 6A. In this light distribution curve, the center is the strongest, which is the intensity that can be observed when the observer is at the front viewing angle.

[0026] On the one hand, when the signal A received by the controller is a voltage signal close to zero, the controller determines that the photointerrupter is blocked by the grid structure. In this case, the controller controls the driver to output the second signal to the light source. FIG. 5 shows the waveform of the second signal. In FIG. 5, the vertical axis of the second signal indicates current, and the horizontal axis indicates time. The waveform of the second signal is a rectangular wave with an inverse phase to the signal A and the first signal. In particular, in the present invention, in order to solve the problem of uneven brightness and chromaticity due to the difference in viewing angle in the conventional display screen, the intensity of the second signal is greater than the intensity of the first signal. Preferably, the amplitude of the second signal is about twice the amplitude of the first signal. In this case, the spatial relationship between the grid structure and the light source is as shown in FIGS. 3 and 4. Specifically, the central region of the light emitting unit 100 is blocked by one of the left grid 210 and the right grid 220. The light emitted from the light emitting unit 100 passes through the both side regions of the left grid 210 or the right grid 220 and is emitted to the outside. Considering that the light intensity on both sides of the light emitting diode is weak, the amplitude of the second signal is preferably larger than the amplitude of the first signal and is twice the amplitude of the first signal. As a result, when an observer views the display device in the state shown in FIGS. 3 and 4 from a side viewing angle, as shown in FIG. 6B, the light emitted to the outside through both sides after the light emitting unit 100 receives the second signal is enhanced. When most of the light emitted from the light emitting unit 100 passes through the both side regions of the left grid 210 and the right grid 220 and is emitted to the outside, since the second signal is an amplified signal, the brightness and chromaticity of the light observed by an observer located at the side viewing angle are improved. As a result, the same result is observed at the side viewing angle position and the front viewing angle position. In short, the brightness of the light passing through the central region of the grid structure when the light emitting unit receives the first signal is substantially equal to the brightness of the light passing through the both side regions of the grid structure when the light emitting unit receives the second signal. Thereby, the problem of uneven brightness and chromaticity due to the difference in the viewing angle of the observer in the conventional display screen can be solved. In this way, the brightness visible to a distant observer is improved and the chromaticity is corrected.

[0027] As described above, the present invention can adjust and correct the brightness and chromaticity when viewed from a long distance by dynamically adjusting the first signal and the second signal. In particular, the display device of the present invention can make the first signal and the second signal different signals corresponding to the left eye and the right eye of the observer. Thereby, the observer can view the three-dimensional display from a short distance. Specifically, as shown in FIG. 7, when the display device 1 of the present invention is applied to a three-dimensional display, the size of the display device needs to be large enough to substantially cover one eye of the observer. The horizontal width (g) of the display device must be at least five times the distance (f) between the display device and the observer. As described above, when the photointerrupter 30 is not blocked by any of the lattice units 200 of the lattice structure 20, the photointerrupter 30 transmits a voltage signal, and the driver outputs a first signal. As a result, the screen A displayed by the display device can be seen by one of the observer's both eyes. On the other hand, when the photointerrupter 30 is blocked by one lattice unit 200 of the lattice structure, the controller controls the driver to output a second signal. As a result, the screen B displayed by the display device can be seen by the other of the observer's both eyes. By making the first signal and the second signal different signals, the observer can view the three-dimensional display from a short distance.

[0028] As described above, in order to solve the problem of non-uniform brightness and chromaticity in the conventional display screen, the present invention uses a light-shielding method for distinguishing the light in the normal direction of the light source from the light on the side. By continuously moving the lattice structure, different output signals are generated, whereby the signals on the front surface and the side of the display device are different. In this way, the observer can view uniform brightness and chromaticity from different viewing angles from a distance, and the display quality is improved.

[0029] The above embodiments illustrate the embodiments of the present invention and explain the characteristic configurations of the present invention. The present invention is not limited to the above embodiments. Modifications or equivalent arrangements that can be easily made by those skilled in the art are also within the scope of the present invention. The scope of protection of the rights of the present invention shall be based on the scope of the claims.

Explanation of Reference Numerals

[0030] 1 represents the device 10 light source 20 lattice structure 30 photointerrupter 40 circuit board 100 light-emitting unit 200 lattice unit 202 horizontal lattice 210 left lattice 220 right lattice g represents the width of the device f represents the distance between the device and the observer

Claims

1. A display device, comprising: A light source; a lattice structure disposed above the light source and movable left and right relative to the light source; A photointerrupter; The display device, wherein the light source receives a first signal when the lattice structure is not blocking the photointerrupter, and wherein the light source receives a second signal when the lattice structure is blocking the photointerrupter.

2. The display device according to claim 1 , wherein the intensity of the second signal is greater than the intensity of the first signal.

3. 3. The display device of claim 2, wherein the brightness of light passing through a central region of the lattice structure when the light source receives the first signal is approximately equal to the brightness of light passing through regions on both sides of the lattice structure when the light source receives the second signal.

4. Further comprising a controller and a driver, When the lattice structure does not block the photointerrupter, the controller controls the driver to output the first signal to the light source after receiving a signal from the photointerrupter; 2 . The display device of claim 1 , wherein when the lattice structure blocks the photointerrupter, the controller controls the driver to output the second signal to the light source after receiving a signal from the photointerrupter. 3 . The display device of claim 1 , wherein the lattice structure blocks the photointerrupter.

5. Further comprising a circuit board; 2. The display device according to claim 1, wherein the light source has a plurality of light-emitting units arranged on the circuit board.

6. 6. The display device of claim 5, wherein each of the light emitting units includes a red light emitting diode, a green light emitting diode and a blue light emitting diode.

7. 6. The display device according to claim 5, wherein the photointerrupter is disposed on the circuit board, and the lattice structure covers or does not cover the photointerrupter when the lattice structure moves left or right.

8. The lattice structure includes a plurality of lattice units, each of the lattice units having a left lattice and a right lattice, and the left lattice and the right lattice are spaced apart from each other; When the lattice structure does not block the photointerrupter, the light of each of the light-emitting units passes through the gap between the left lattice and the right lattice of the lattice unit above it; 6. The display device according to claim 5, wherein when the lattice structure blocks the photointerrupter, the light of each of the light-emitting units passes through both side regions of the left lattice and the right lattice of the lattice unit above it.

9. The display device of claim 8, characterized in that in each of the lattice units, the lattice width of the left lattice and the right lattice is approximately 0.5 to 20 times the characteristic size of the light-emitting unit, and the characteristic size is the effective diameter or effective side length of the light-emitting unit.

10. 9. The display device according to claim 8, wherein the distance between each of the lattice units and the circuit board is approximately 1 to 20 times the lattice width of the left lattice and the right lattice in each of the lattice units.

11. 2. The display device according to claim 1, wherein when the width of the display device is five times or more the distance between the display device and a viewer, a three-dimensional display is provided to the viewer by making the first signal and the second signal different signals corresponding to the left eye and right eye of the viewer.

Images