CN-117413142-B - Lighting device

CN117413142BCN 117413142 BCN117413142 BCN 117413142BCN-117413142-B

Abstract

The lighting device includes a light emitting module including a light source, a light guide plate including an end surface on which light from the light source is incident and a first surface from which the incident light is emitted, and an optical element configured to transmit light from the light emitting module, the first and second liquid crystal cells including first and second substrates alternately arranged in a first direction, and the second substrate alternately arranged in a second direction intersecting the first direction, the light emitting module including a light source, a light guide plate including an end surface on which the light from the light source is incident and a first surface from which the incident light is emitted, and a prism sheet disposed opposite the first surface, the second substrate of the first liquid crystal cell being adjacent to the first substrate of the second liquid crystal cell, the first surface including a plurality of first grooves extending in a third direction intersecting the first and second directions.

Inventors

IKEDA KOJIRO
Kazuo Koshi
TAE KUROKAWA
Inoki Keiji

Assignees

株式会社日本显示器

Dates

Publication Date: 20260512
Application Date: 20220527
Priority Date: 20210531

Claims (13)

1. A lighting device, comprising: Light emitting module, and An optical element in which a first liquid crystal cell and a second liquid crystal cell are laminated and which transmits light irradiated from the light emitting module, The first liquid crystal cell and the second liquid crystal cell each include: A first substrate having first transparent electrodes and second transparent electrodes alternately arranged in a first direction, and A second substrate in which third transparent electrodes and fourth transparent electrodes are alternately arranged in a second direction intersecting the first direction, The light emitting module includes: A light source; A light guide plate including an end face on which light irradiated from the light source is incident and a first face from which the incident light is emitted, and A prism sheet disposed opposite to the first surface, The second substrate of the first liquid crystal cell is adjacent to the first substrate of the second liquid crystal cell, The first face includes a plurality of first grooves extending in a third direction intersecting the first direction and the second direction.
2. The lighting device of claim 1, wherein, The light emitting module irradiates collimated light.
3. The lighting device according to claim 1 or 2, wherein, A second face of the light guide plate opposite to the first face includes a plurality of second grooves extending in a fourth direction crossing the third direction.
4. The lighting device according to claim 3, wherein, The optical element is further laminated with a third liquid crystal cell and a fourth liquid crystal cell, The third liquid crystal cell and the fourth liquid crystal cell respectively include: A third substrate having fifth and sixth transparent electrodes alternately arranged in a comb-tooth shape in the second direction, and A fourth substrate in which seventh transparent electrodes and eighth transparent electrodes are alternately arranged in a comb-teeth shape in the first direction, The second substrate of the second liquid crystal cell is adjacent to the third substrate of the third liquid crystal cell, The fourth substrate of the third liquid crystal cell is adjacent to the third substrate of the fourth liquid crystal cell.
5. The lighting device of claim 4, wherein, The first direction intersects the second direction at 90 deg. + -10 deg., The third direction intersects the fourth direction at 90 ° ± 10 °.
6. The lighting device of claim 5, wherein, The angle formed by the first direction and the third direction is 45 degrees plus or minus 10 degrees.
7. The lighting device of claim 6, wherein, The lighting device further includes a list storing values of electric potentials for correcting a light distribution shape when the electric potential difference between the first transparent electrode and the second transparent electrode, the electric potential difference between the third transparent electrode and the fourth transparent electrode, the electric potential difference between the fifth transparent electrode and the sixth transparent electrode, and the electric potential difference between the seventh transparent electrode and the eighth transparent electrode are 0V, respectively.
8. A lighting device, comprising: Light emitting module, and An optical element in which a first liquid crystal cell and a second liquid crystal cell are laminated and which transmits light irradiated from the light emitting module, The first liquid crystal cell and the second liquid crystal cell each include: A first substrate having first transparent electrodes and second transparent electrodes alternately arranged in a first direction, and A second substrate in which third transparent electrodes and fourth transparent electrodes are alternately arranged in a second direction intersecting the first direction, The light emitting module includes: A light source, and And a reflector disposed around the light source and reflecting light irradiated from the light source, wherein the second substrate of the first liquid crystal cell is adjacent to the first substrate of the second liquid crystal cell.
9. The lighting device of claim 8, wherein, The optical element is further laminated with a third liquid crystal cell and a fourth liquid crystal cell, The third liquid crystal cell and the fourth liquid crystal cell respectively include: A third substrate having fifth and sixth transparent electrodes alternately arranged in a comb-tooth shape in the second direction, and A fourth substrate in which seventh transparent electrodes and eighth transparent electrodes are alternately arranged in a comb-teeth shape in the first direction, The second substrate of the second liquid crystal cell is adjacent to the third substrate of the third liquid crystal cell, The fourth substrate of the third liquid crystal cell is adjacent to the third substrate of the fourth liquid crystal cell.
10. The lighting device of claim 9, wherein, The first direction intersects the second direction at 90 ° ± 10 °.
11. The lighting device of claim 10, wherein, The lighting device further includes a list storing values of electric potentials for correcting a light distribution shape when the electric potential difference between the first transparent electrode and the second transparent electrode, the electric potential difference between the third transparent electrode and the fourth transparent electrode, the electric potential difference between the fifth transparent electrode and the sixth transparent electrode, and the electric potential difference between the seventh transparent electrode and the eighth transparent electrode are 0V, respectively.
12. The lighting device according to any one of claims 1 to 11, wherein, The lighting device further includes a control section communicatively connected to the information terminal, The signal processing section of the control section controls the brightness of the light emitting module based on a request signal from the information terminal.
13. The lighting device according to any one of claims 1 to 11, wherein The lighting device further includes a control section communicatively connected to the information terminal, The signal processing unit of the control unit controls the electric potential supplied to the optical element based on a request signal from the information terminal.

Description

Lighting device Technical Field One embodiment of the present invention relates to a lighting device. Background Conventionally, there is known a so-called liquid crystal lens which is an optical element that adjusts a voltage applied to liquid crystal and uses a change in refractive index of the liquid crystal (for example, refer to patent document 1, patent document 2, or patent document 3). For example, the lighting devices described in patent document 1 and patent document 2 distribute light from a light source into a circular shape by using a liquid crystal lens. In the beam shaping device described in patent document 3, the pattern of the electrode applied to the liquid crystal is changed to change the light distribution shape of the light. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2005-317879 Patent document 2 Japanese patent application laid-open No. 2010-230887 Patent document 3 Japanese patent application laid-open No. 2014-160277 Disclosure of Invention Technical problem to be solved by the invention The light distribution shape of the light transmitted through the liquid crystal lens also varies according to the structure of the light emitting module including the light source. Therefore, there is a need for a lighting device including an optical element corresponding to all the light emitting modules. In view of the above, an object of one embodiment of the present invention is to provide a lighting device capable of correcting a light distribution shape according to a structure of a light emitting module. Technical scheme for solving technical problems An illumination device according to one embodiment of the present invention includes an optical element in which a first liquid crystal cell and a second liquid crystal cell are stacked and through which light irradiated from a light emitting module is transmitted, the first liquid crystal cell and the second liquid crystal cell each include a first substrate in which a first transparent electrode and a second transparent electrode are alternately arranged in a first direction, and a second substrate in which a third transparent electrode and a fourth transparent electrode are alternately arranged in a second direction intersecting the first direction, the light emitting module includes a light source, a light guide plate including an end surface on which light irradiated from the light source is incident and a first surface from which the incident light is emitted, and a prism sheet disposed opposite to the first surface, the second substrate of the first liquid crystal cell is adjacent to the first substrate of the second liquid crystal cell, and the first surface includes a plurality of first grooves extending in a third direction intersecting the first direction and the second direction. The lighting device according to one embodiment of the present invention includes a light emitting module including a first substrate on which first transparent electrodes and second transparent electrodes are alternately arranged in a first direction, and an optical element on which first liquid crystal cells and second liquid crystal cells are stacked and which transmit light irradiated from the light emitting module, the first and second liquid crystal cells each including a first substrate on which third transparent electrodes and fourth transparent electrodes are alternately arranged in a second direction intersecting the first direction, and a reflector disposed around the light source and reflecting light irradiated from the light source, the second substrate of the first liquid crystal cell being adjacent to the first substrate of the second liquid crystal cell. Drawings Fig. 1A is a schematic exploded perspective view of a lighting device according to an embodiment of the present invention. Fig. 1B is a partial enlarged view illustrating a light emitting module of a lighting device according to an embodiment of the present invention. Fig. 1C is a block diagram illustrating a lighting device according to an embodiment of the present invention. Fig. 2A is a schematic perspective view of an optical element of an illumination device according to an embodiment of the present invention. Fig. 2B is a schematic cross-sectional view of an optical element of the lighting device according to an embodiment of the present invention. Fig. 2C is a schematic cross-sectional view of an optical element of the lighting device according to an embodiment of the present invention. Fig. 3A is a schematic cross-sectional view illustrating light distribution control of an optical element of an illumination device according to an embodiment of the present invention. Fig. 3B is a schematic cross-sectional view illustrating light distribution control of an optical element of the illumination device according to the embodiment of the present invention. Fig. 4 is a schematic diagram illustrating a relationship between an o