JP2018194677A - Display device - Google Patents

Abstract

Provided is a display device in which uneven illumination is reduced and processing time is reduced. A display device includes a light emitting unit that emits light, a display unit having a display mark, and a diffusion unit that diffuses light reaching the display unit from the light emitting unit. The diffusing unit 7 has a conical shape in which the thickness along the optical path decreases as the distance from the optical axis OL increases in the region reaching from the light emitting unit 5. [Selection] Figure 1

Description

  The present invention relates to a display device.

  The display device applied to the switch has different levels of brightness of the light illuminated on the back surface of the identification display provided on the back surface of the operation button. By increasing the height of the formed protrusion and illuminating light with low brightness, the brightness of the light from the illuminated part is adjusted by reducing the height of the protrusion to eliminate uneven illumination. (For example, refer to Patent Document 1).

JP 2003-123585 A

  In the display device described in Patent Document 1, in order to eliminate illumination unevenness, it is necessary to adjust the thickness of the diffusing portion for each display device in accordance with the light emission characteristics of each illumination portion, and the processing effort is reduced. The problem of being large arises.

  Accordingly, it is an object of the present invention to provide a display device that can eliminate uneven illumination and reduce processing effort.

  In order to achieve the above object, the present invention includes a light emitting unit that emits light, a display unit having a display mark, and a diffusion unit that diffuses light reaching the display unit from the light emitting unit, and the diffusion The portion constitutes a display device having a conical shape in which the thickness along the optical path decreases as the distance from the optical axis increases in the region reaching from the light emitting portion.

  In this invention, it is preferable that the said spreading | diffusion part is cone shape.

  In the present invention, it is preferable that the diffusing portion has a step shape in which the thickness decreases as the distance from the optical axis increases.

  According to the present invention, since the shape of the diffusing portion is determined in view of the rough light emission characteristics of the light source, it is possible to achieve both elimination of uneven illumination and suppression of processing time.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram explaining an example of the display apparatus which concerns on embodiment of this invention, Comprising: (a) is a front view, (b) is the Ib-Ib arrow directional cross-sectional view of (a). It is a schematic diagram explaining the positional relationship of a light-diffusion part and a light emitting element. It is a schematic diagram explaining the preparation procedure of a light-diffusion part. It is a schematic diagram explaining another example of a light-diffusion part.

  Embodiments of a display device according to the present invention will be described below with reference to the accompanying drawings. In the drawings according to the present embodiment, the aspect ratio and the like are exaggerated for easy explanation of the configuration.

  In FIG. 1A and FIG. 1B, the display device 1 shows an example of an illuminating display device that illuminates and displays various information displays such as operation contents and functions.

  The display device 1 includes a display unit 3 supported by the front opening of the case 2, a circuit board 4 disposed in the case 2 facing the back surface of the display unit 3, and a backlight mounted on the circuit board 4. And a light emitting element 5 such as a laser diode (LD).

  Although the display part 3 is not specifically limited, It is comprised as an operation knob of switches. Examples of the material of the display unit 3 include a general light transmissive resin such as an acrylic resin that easily transmits light from the light emitting element 5 from the back surface side to the front surface side.

  As shown in FIG. 1A, FIG. 1B, and FIG. 2, a light-shielding coating layer that is coated on the surface of the display unit 3 except a portion corresponding to a display shape to be illuminated. 6 is formed. The part where the surface of the display unit 3 is not coated is formed as a light-transmitting display unit 6a by peeling off the coating corresponding to the display shape. About the material of the coating layer 6, arbitrary well-known materials can be especially used without a restriction | limiting.

  The extraction display portion 6 a is configured as a design region that is transmitted and illuminated by light from the light emitting element 5. The design area is composed of various displays such as letters, numbers, figures, symbols or patterns. The structure which forms the coating layer 6 and the extraction display part 6a on the back surface of the display part 3 is also employable. Instead of the light-shielding coating layer 6, a light-shielding printing layer subjected to silk printing except for a portion corresponding to the display can be employed.

  The back surface of the display unit 3 is configured as a light receiving surface that receives light from the light emitting element 5. The light from the light emitting element 5 is shielded from light in the region of the coating layer 6 of the display unit 3 and is transmitted through the region of the display unit 6 a without the coating layer 6. The display of characters, numbers, figures, symbols, patterns or the like written on the display unit 3 is illuminated by the transmitted light.

  In the present embodiment, the light diffusing portion 7 having light diffusibility and light transmittance is provided on the light receiving surface of the display portion 3. The light diffusing unit 7 is made of a light diffusing material applied to the light receiving surface of the display unit 3. As the light diffusing material, any known material having light diffusibility and light transmittance can be used without particular limitation.

  As shown in FIG. 2, the light emitting element 5 has a directivity in which the luminance (light amount) of light is the largest on the optical axis OL that is the central ray of the outgoing light beam L, and the luminance of light decreases as the distance from the optical axis OL increases. Have The central axis CL of the light diffusing unit 7 is arranged at a position immediately above the optical axis OL of the light emitting element 5 so as to correspond to the optical axis OL of the light emitting element 5 having such strong directivity.

  The light diffusing portion 7 preferably has a shape in which the thickness is set to be thick in a region including the position immediately above the light emitting element 5 and the vicinity of the position immediately above, and the thickness decreases as the distance from the optical axis OL of the light emitting element 5 increases.

  The light diffusing unit 7 according to the illustrated example has a conical shape extending from the top on the light emitting element 5 side toward the bottom on the display unit 3 side. Thereby, even if it uses the light emitting element 5 with strong directivity, a luminance difference (light quantity difference) is suppressed according to the distance difference between the light diffusion part 7 and the light emitting element 5.

  Since the light diffusing unit 7 is a light diffusing material applied to the light receiving surface of the display unit 3, the light diffusing material is used as the light receiving surface of the display unit 3 as shown in FIGS. 3A and 3B. It is applied in a plate shape and cured. A removal processed surface (laser processed surface) 7a is formed on the application surface of the light diffusing material after the curing by removing unnecessary portions by laser processing (laser processing) by laser irradiation Lb. Thereby, a predetermined cone shape is provided to the light diffusing material.

  The cone shape of the light diffusing unit 7 includes a cone shape, a truncated cone shape, an elliptical cone shape, an elliptical truncated cone shape, a triangular pyramid shape, a triangular truncated pyramid shape, a quadrangular pyramid shape, a quadrangular pyramid shape, a hexagonal pyramid shape, six Examples include a truncated pyramid shape.

  As shown in FIG. 4, the light diffusing unit 7 may have a cone shape having an inclined surface in which the circumferential surface of the cone is formed in a stepped shape. In addition, the top part of the cone shape may be a shape formed on a surface, a curved surface, or a flat surface with a sharp tip. In addition, the cone-shaped slope may be formed in a flat or curved surface.

  As described above, the light diffusing unit 7 is a light diffusing material applied to the light receiving surface of the display unit 3. A removal processed surface 7a can be formed on the application surface of the light diffusing material by removing unnecessary portions by removing the laser irradiation Lb. The removal process by the laser irradiation Lb can be performed on the portion where the luminance is desired to be increased by adjusting the coating amount of the light diffusion material and the laser output. Therefore, the shape of the light diffusion part 7 can be configured as an arbitrary shape as necessary.

  The display device 1 configured as described above includes a display unit 3 for displaying information, a light diffusing unit 7 applied to the back surface of the display unit 3, and a light emitting element that irradiates the back side of the light diffusing unit 7. And 5. The light diffusing unit 7 is a light diffusing material applied to the back surface of the display unit 3, and the surface to which the light diffusing material is applied has a thick first region corresponding to the optical axis OL of the light emitting element 5. The light-emitting element 5 has a removal processing surface 7a in which the thickness of the second region away from the optical axis OL is reduced.

  The first region is a region including the central axis CL of the surface on which the light diffusing material is applied, and the second region is preferably a region whose thickness decreases as the distance from the optical axis OL of the light emitting element 5 increases. .

  By adopting such a configuration, it is possible to adjust the product accuracy by applying the light diffusion material and adjusting the laser output. Therefore, it is possible to take measures against illumination unevenness by performing removal processing by laser irradiation Lb on the portion of the light diffusing material where the luminance is desired to be increased.

  The degree of improvement in illumination unevenness can be controlled by changing the application amount of the light diffusing material, the method of applying the light diffusing material, the program for removing the light diffusing material by the laser irradiation Lb, and the like. Therefore, retry is easy.

  Uneven lighting can be improved by using the same method for prototype molds and mass-produced molds. Therefore, it is easy to confirm the effect of improving the illumination unevenness at an early stage.

  Note that the display device 1 according to the present invention is suitably applied to an illumination target part such as an input operation part of various in-vehicle devices and various electronic devices such as portable terminals installed around the driver's seat of the vehicle. be able to.

  As is clear from the above description, the embodiments, modifications, and illustrated examples according to the present invention do not limit the invention according to the claims. Therefore, it should be noted that not all the combinations of features described in the above embodiments, modifications, and illustrated examples are necessarily essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Case, 3 ... Display part, 4 ... Circuit board, 5 ... Light emitting element, 6 ... Paint layer, 6a ... Extraction display part, 7 ... Light diffusion part, 7a ... Removal process surface, CL ... Center Axis, L ... outgoing light beam, Lb ... laser irradiation, OL ... optical axis

Claims (3)

A light emitting unit that emits light;
A display unit having a display mark;
A diffusion unit that diffuses light reaching the display unit from the light emitting unit,
The diffusion unit is a display device having a conical shape in which the thickness along the optical path is reduced as the distance from the optical axis increases in the region reaching from the light emitting unit.   The display device according to claim 1, wherein the diffusion portion has a conical shape.   The display device according to claim 1, wherein the diffusing portion has a stepped shape in which the thickness decreases as the distance from the optical axis increases.

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