JP2018194676A - Display device - Google Patents

Abstract

To provide a display device that has an excellent efficiency of light usage and can display a mark brightly without increasing the optical amount of a light source.SOLUTION: A display device 1 includes: light sources (first light source 40, second light source 50); light source-side polarizers (first light source side polarizer 45 and second light source side polarizer 55), which transmit polarized light in a specific direction of the light from the light sources; display polarizers (first display polarizer 20, second display polarizer 30), which present information in such a manner that the polarized light passing through the light-source polarizers are emitted; and a coating unit 90 covering at least a part of the region around the light sources, the light-source polarizers being reflective and the coating unit 90 making the light from the light source irregularly reflected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  As a conventional technique, two light sources, two light source polarizing plates that pass polarized light in specific directions orthogonal to each other, and each light source side polarizing plate, arranged in a case partitioned by a partition wall, A polarizing plate for display which is formed by a polarizing plate having the polarization direction of each of the passed light and forms a design such as a mark as information to be presented, and switches information to be presented by switching light emission of two light sources. A display device is known (for example, see Patent Document 1).

  According to this display device, the design of different marks and the like can be switched, so that the space on the display surface can be reduced, and a clear display can be achieved with a simple configuration compared to a conventional display switching lamp for the same purpose. Is supposed to be obtained.

Japanese Utility Model Publication No. 61-25002

  In the display device of Patent Document 1, light polarized in a specific direction that passes through the light source side polarizing plate is transmitted depending on whether it is parallel or orthogonal to the polarization direction of each display polarizing plate. Switches the display of designs such as type marks. However, since the light reaching the display polarizing plate is a part of the light from the light source, there is a problem that the light use efficiency is low and the brightness of the display mark is low.

  Accordingly, it is an object of the present invention to provide a display device that has a high light utilization efficiency and can display a mark brightly without increasing the amount of light source.

[1] To achieve the above object, information is obtained by irradiating a light source, a light source side polarizing plate that transmits polarized light in a specific direction among the light from the light source, and polarized light that has passed through the light source side polarizing plate. A polarizing plate for display that presents the light source, and a covering portion that surrounds at least a part of the periphery of the light source, the light source side polarizing plate is a reflective polarizing plate, and the covering portion is light from the light source. Provided is a display device that diffuses reflection.

[2] The display device according to [1], wherein the light source side polarizing plate is a wire grid polarizing plate in which a metal is formed on a part of the wire grid.

[3] The display unit according to [1] or [2], wherein the covering portion surrounds the light source with a reflection surface, and the reflection surface is subjected to a diffuse reflection process. May be.

[4] The display polarizing plate includes a first display polarizing plate that presents information by being irradiated with a first polarized light whose first polarization direction is the specific direction, and the first display polarizing plate. For the second display, which is provided so as to partially overlap with the polarizing plate and presents information by irradiation with the second polarized light having the second polarization direction different from the first polarization direction as the specific direction. The light source side polarizing plate includes a first light source side polarizing plate that transmits polarized light in the first polarization direction and a second light source side polarizing plate that transmits polarized light in the second polarization direction. The display device according to any one of [1] to [3] may be configured.

  According to the display device of the present invention, it is possible to provide a display device that has good light use efficiency and can display the mark brightly without increasing the light source light amount.

FIG. 1A is a top plan view of a display device according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view showing the AA cross section of FIG. 2A is a top plan view of the first display polarizing plate, FIG. 2B is a cross-sectional view of FIG. 2A, and FIG. 2C is a top plan view of the second display polarizing plate. FIG. 2 and FIG. 2D are cross-sectional views of FIG. FIG. 3A is an enlarged view of part B shown in FIG. 1B, and FIG. 3B is a perspective view of the first light source side polarizing plate. FIG. 4 is an enlarged view of part C shown in FIG. FIG. 5A is an upper plan view showing a state in which the first display mark portion is displayed when the first light source is caused to emit light, and FIG. 5B is a path of light emitted from the first light source. FIG. FIG. 6A is an upper plan view showing a state in which the second display mark portion is displayed when the second light source is caused to emit light, and FIG. 6B is a path of light emitted from the second light source. FIG.

(Embodiment of the present invention)
The display device 1 according to the embodiment of the present invention includes a light source (first light source 40, second light source 50) and a light source side polarizing plate (first light source side) that transmits polarized light in a specific direction out of light from the light source. A polarizing plate 45, a second light source side polarizing plate 55), and a display polarizing plate (first display polarizing plate 20, second display polarized light) that presents information by being irradiated with polarized light that has passed through the light source side polarizing plate. Plate 30) and a covering portion 90 surrounding at least a part of the periphery of the light source, the light source side polarizing plate is a reflective polarizing plate, and the covering portion 90 is configured to diffusely reflect light from the light source. Has been.

(Display unit 10)
As shown in FIGS. 1A and 1B, the display unit 10 includes a display panel unit 11 that is pressed, a diffusion plate 15 that is attached to the display panel unit 11, a first display polarizing plate 20, The housing 12 is a recess that houses the second display polarizing plate 30. The display panel unit 11 is made of, for example, resin and has a smoke specification.

  As shown in FIGS. 1A and 1B, the display unit 10 is for presenting or displaying one or more pieces of information. The lower part of the display unit 10 is fixed to the holder unit 60.

  As shown in FIG. 1A, the display area 13 is divided into several areas, and graphics such as marks and characters are presented and displayed on the display surface 13. Below, it demonstrates as a display of figures, such as a mark and a character, as one form of presentation of figures, such as a mark and a character.

  A figure such as a mark or a character displayed on the display surface 13 will be described later by a combination of a polarizing portion and a transmissive portion formed on the first display polarizing plate 20 and the second display polarizing plate 30 described later. Displayed based on the light emission switching control of the first light source 40 and the second light source 50. In addition, although this display is illuminated and displayed with uniform light by being displayed through the diffusion plate 15 described above, a configuration without the diffusion plate 15 may be used. Further, since the display panel unit 11 has a smoke specification, when it is not illuminated and displayed by the first light source 40 or the like, it is in a blackout state.

  As shown in FIG. 1 (a), the common unit 101 cancels the polarization direction in each of the regions that transmit and display the light of both the first light source 40 and the second light source 50, that is, each of the polarization units described later. This is a presentation unit in which information to be presented is shown. The common portion 101 is provided so that a part of the first display polarizing plate 20 and the second display polarizing plate 30 overlap each other. The display by the light emission of the first light source 40 and the display by the light emission of the second light source 50 are provided. In FIG. 5, the area is displayed in common.

  The first region 102 is a region where only the light from the first light source 40 is transmitted and the light from the second light source 50 is not transmitted, that is, a polarization unit having a corresponding polarization direction. In FIG. 1 (a), the region is indicated by horizontal hatching. The second region 103 is a region where only the light from the second light source 50 is transmitted and the light from the first light source 40 is not transmitted, that is, a polarization unit having a corresponding polarization direction. In FIG. 1A, this is a region indicated by vertical hatching. The non-display area 104 is an area that does not transmit light from either the first light source 40 or the second light source 50. In FIG. 1A, this is a region indicated by cross hatching in the vertical and horizontal directions. The outer frame portion 105 is also a non-display area.

  On the display surface 13, graphics such as predetermined marks and characters formed by the combination of the common portion 101, the first region 102, the second region 103, and the non-display region 104 described above are displayed. Note that light transmission and non-transmission need only be such that a figure such as a predetermined mark or character is displayed, and it is not necessary that the transmittance is 100% and the opaqueness is 100%. Further, in the non-display area 104, an impermeable area may be formed in a corresponding area of the first display polarizing plate 20 or the second display polarizing plate 30 by, for example, black coating.

(First display polarizing plate 20)
The first display polarizing plate 20 is formed of a plate-shaped polarizing plate and functions as a presentation filter. The first display polarizing plate 20 is, for example, a polarizing plate sandwiched between protective films that protect the upper and lower sides of a polarizing layer having a polarizing function.

  The light linearly polarized in the same direction as the first polarization direction 23a is not transmitted. Further, the light linearly polarized in the direction orthogonal to the first polarization direction 23a (second polarization direction 23b) is transmitted.

  In addition, the 1st transmission part 22 shown to Fig.2 (a) is an area | region which lost the polarization characteristic. Thereby, the 1st transmission part 22 can permeate | transmit light irrespective of a polarization state.

  As shown in FIGS. 2 (a) and 2 (b), the first display polarizing plate 20 has a first polarizing section 21 that does not transmit linearly polarized light polarized in the first polarization direction 23a and a polarization state. The first transmission portion 22 is configured to transmit light without depending on the area. Accordingly, the first display polarizing plate 20 functions as a presentation filter. The shapes of the first polarizing portion 21 and the first transmitting portion 22 can display a figure such as a predetermined mark or character by a combination with a second display polarizing plate 30 described later.

(Second display polarizing plate 30)
The second display polarizing plate 30 is also formed of a plate-like polarizing plate with the same configuration as the first display polarizing plate 20 and functions as a presentation filter. The second display polarizing plate 30 is provided in the display unit 10 so as to partially overlap the first display polarizing plate 20. Here, the first polarization direction 23a and the second polarization direction 23b are orthogonal to each other.

  As shown in FIGS. 2C and 2D, the second display polarizing plate 30 includes a second polarizing unit 31 that does not transmit linearly polarized light polarized in the second polarization direction 23b and a polarization state. The second transmission portion 32 is configured to transmit light without depending on it. Therefore, the second display polarizing plate 30 functions as a presentation filter. The shapes of the second polarizing part 31 and the second transmitting part 32 can display a figure such as a predetermined mark or character by combining with the first display polarizing plate 20 described above.

(First light source 40)
For example, LED light or the like can be used as the first light source 40. In the case of LED light or the like, a polarizing element is arranged at the emitting portion so as to have a polarization component in a specific direction. In the present embodiment, an LED light source is used as the first light source 40, and the first light source side polarizing plate 45 is disposed in the emission part.

  The first light source 40 emits light having a polarization direction in the first polarization direction 23 a shown in FIG. 2A through the first light source side polarizing plate 45 attached to the holder unit 60. The light emitted from the first light source 40 through the first light source side polarizing plate 45 can pass through the entire region of the second display polarizing plate 30 and the first transmission part 22 of the first display polarizing plate 20.

(Second light source 50)
For example, LED light or the like can be used as the second light source 50. In the case of LED light or the like, a polarizing element is arranged at the emitting portion so as to have a polarization component in a specific direction. In the present embodiment, an LED light source is used as the second light source 50, and the second light source side polarizing plate 55 is disposed in the emission part.

  The second light source 50 emits light having a polarization direction in the second polarization direction 23 b shown in FIG. 2C through the second light source side polarizing plate 55 attached to the holder unit 60. Therefore, the polarization direction of the light emitted from the second light source 50 through the second light source side polarizing plate 55 is orthogonal to the polarization direction of the light emitted from the first light source 40 through the first light source side polarizing plate 45. The light emitted from the second light source 50 through the second light source side polarizing plate 55 can pass through the entire area of the second transmitting portion 32 of the second display polarizing plate 30 and the first display polarizing plate 20.

(First light source side polarizing plate 45, second light source side polarizing plate 55)
The first light source side polarizing plate 45 and the second light source side polarizing plate 55 are reflection type polarizing plates. Hereinafter, as a specific example of the reflective polarizing plate, a wire grid polarizing plate in which a metal is formed on a part of the wire grid will be described.

  As shown in FIG. 3A, a UV curable resin is printed on a resin film 450 such as TAC (triacetyl cellulose) and cured to form a pattern of wire grids 452 having a predetermined pitch. For example, aluminum (Al) 454 is vapor-deposited as a metal on a part (one surface) of the wire grid 452 to form a wire grid polarizing plate.

  The wire grid polarizing plates (first light source side polarizing plate 45 and second light source side polarizing plate 55) reflect light that vibrates in the grid direction G shown in FIG. To Penetrate. Therefore, by setting the grid direction G of the first light source side polarizing plate 45 to a direction orthogonal to the first polarization direction 23a shown in FIG. 1A, only light polarized in the first polarization direction 23a is obtained. Can be transmitted. Further, by setting the grid direction G of the second light source side polarizing plate 55 to a direction orthogonal to the second polarization direction 23b shown in FIG. 1A, only light polarized in the second polarization direction 23b is obtained. Can be transmitted.

(Coating 90, 95)
As shown in FIGS. 1B and 4, the covering portions 90 and 95 have the effect of irregularly reflecting light from the light sources (first light source 40 and second light source 50), that is, diffusely reflecting. The covering units 90 and 95 surround the periphery of the light source (the first light source 40 and the second light source 50) with a reflection surface, and the reflection surface is subjected to diffuse reflection processing. As shown in FIG. 4, the covering portion 90 provided on the first light source 40 side will be described. The covering portion 95 provided on the second light source 50 side has the same configuration.

  As shown in FIG. 4, the cover 90 may be configured to surround at least a part of the periphery of the first light source 40, but in the present embodiment, it is configured to surround the entire periphery of the first light source 40. ing. The surface 90a on the light source side of the cover 90 is a non-smooth surface and diffuses and reflects light. As the covering portion 90, a scattering material (diffusion material) having a high reflectance, for example, a Spectralon diffusion material can be used. In addition, a highly diffuse reflection coating material, a high diffusion reflection coating material, or the like having a high reflectance can be used for the surface 90a. .

  In the light 40a emitted from the first light source 40, light having a polarization direction in the first polarization direction 23a shown in FIG. 1A is transmitted through the first light source-side polarizing plate 45, but light in other polarization directions. Is reflected to become, for example, light 40b. This light 40b is diffusely reflected by the surface 90a. Ideally, perfect diffuse reflection (Lambert reflection) that uniformly reflects in all directions is preferable. The reflected light is further diffusely reflected by the other surface 90a. The light thus scattered becomes light having no polarization characteristic, and only the light having the polarization direction in the first polarization direction 23 a passes through the first light source side polarizing plate 45.

  Since the first light source side polarizing plate 45 is a reflection type polarizing plate, the light that does not transmit through the first light source side polarizing plate 45 is reflected and repeats diffuse reflection on the surface 90a of the covering portion 90 again. By such irregular reflection (diffuse reflection) of light and transmission and reflection in the first polarization direction 23a, all of the light emitted from the first light source 40 except for the amount lost by reflection is in the first polarization direction 23a. It is extracted as polarized light having a polarization direction.

  From the above, most of the light emitted from the first light source 40 is transmitted through the first light source side polarizing plate 45 and is polarized in the first polarization direction 23a as the display unit 10 (first display polarized light). The plate 20 and the second display polarizing plate 30) are irradiated. Similarly, most of the light emitted from the second light source 50 is transmitted through the second light source side polarizing plate 55 and is polarized in the second polarization direction 23b as the display unit 10 (first display polarizing plate). 20 and the second display polarizing plate 30).

(Display of the first display mark part)
When the first light source 40 emits light, as shown in FIG. 5B, the polarization direction is changed from the first light source 40 to the first polarization direction 23a shown in FIG. The light which has is emitted. This light is applied to the first display polarizing plate 20 and the second display polarizing plate 30. Since this light has a polarization direction in the first polarization direction 23 a, the light is transmitted through the entire region of the second display polarizing plate 30 and the first transmission portion 22 of the first display polarizing plate 20. Therefore, the first display mark portion 25 that combines the common portion 101 and the first region 102 shown in FIG. 1A is displayed as shown in FIG. The area other than the first display mark part 25 is not displayed as the first non-display mark part 26 including the second area 103, the non-display area 104, and the frame part 105 shown in FIG. It becomes the state of.

(Display of second display mark part)
When the second light source 50 emits light, as shown in FIG. 6B, the polarization direction is changed from the second light source 50 to the second polarization direction 23b shown in FIG. The light which has is emitted. This light is applied to the first display polarizing plate 20 and the second display polarizing plate 30. Since this light has a polarization direction in the second polarization direction 23 b, the light is transmitted through the entire area of the second transmission portion 32 of the second display polarizing plate 30 and the first display polarizing plate 20. Therefore, the second display mark portion 35 that combines the common portion 101 and the second region 103 shown in FIG. 1A is displayed as shown in FIG. Regions other than the second display mark portion 35 are not displayed as the second non-display mark portion 36 that is a combination of the first region 102, the non-display region 104, and the frame portion 105 shown in FIG. It becomes the state of.

(Effect of embodiment)
The embodiment of the present invention has the following effects.
(1) The display device 1 according to the present embodiment includes a light source (first light source 40, second light source 50) and a light source side polarizing plate (first light source) that transmits polarized light in a specific direction out of light from the light source. Side polarizing plate 45, second light source side polarizing plate 55), and a display polarizing plate (first display polarizing plate 20, second display display) that is irradiated with the polarized light that has passed through the light source side polarizing plate. The light source side polarizing plate is a reflection type polarizing plate, and the coating unit 90 irregularly reflects (diffuse reflection) light from the light source. ). Of the light emitted from the light source, the light reflected by the light source side polarizing plate is diffusely reflected by the covering portion, and part of the light is again transmitted through the light source side polarizing plate. By repeating this process, all of the light emitted from the light source except for the amount lost by reflection is extracted as polarized light. Accordingly, it is possible to provide a display device that has a high light utilization efficiency and can display the mark brightly without increasing the light source light amount.
(2) The display device 1 according to the present embodiment uses wire grid polarizing plates as the light source side polarizing plates (the first light source side polarizing plate 45 and the second light source side polarizing plate 55). The wire grid polarizing plate is a reflective polarizing plate and can reflect light that does not pass through the light source side polarizing plate with high efficiency. Accordingly, it is possible to provide a display device that has a high light utilization efficiency and can display the mark brightly without increasing the light source light amount.
(3) In addition, the display device 1 according to the present embodiment includes a covering portion that surrounds at least a part of the periphery of the light source. Since the surface of the covering portion can be made of a material that irregularly reflects light (diffuse reflection), the light scattered on the surface can be diffusely reflected again toward the light source side polarizing plate as light having no polarization characteristic. Accordingly, it is possible to provide a display device that has a high light utilization efficiency and can display the mark brightly without increasing the light source light amount.

  As mentioned above, although some embodiment of this invention was described, these embodiment is only an example and does not limit the invention which concerns on a claim. Moreover, these novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all the combinations of features described in these embodiments are essential to the means for solving the problems of the invention. Furthermore, these embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... Display part, 11 ... Display panel part, 12 ... Storage part, 13 ... Operation surface, 15 ... Diffusing plate, 20 ... 1st polarizing plate for display, 21 ... 1st polarizing part, 22 ... 1st 1 transmission part, 23a ... first polarization direction, 23b ... second polarization direction, 25 ... first display mark part, 26 ... first non-display mark part, 30 ... second display polarizing plate, 31 ... second Polarization section 32 ... second transmission section 35 ... second display mark section 36 ... second non-display mark section 40 ... first light source 45 ... first light source side polarizing plate 50 ... second light source 55 ... Second light source side polarizing plate, 60: holder portion, 90, 95 ... covering portion, 101 ... common portion, 102 ... first region, 103 ... second region, 104 ... non-display region, 105 ... frame portion, 450 ... resin Film, 452 ... Wire grid, 454 ... Aluminum (Al)

Claims (4)

A light source;
Of the light from the light source, a light source side polarizing plate that transmits polarized light in a specific direction,
A polarizing plate for display that presents information by being irradiated with polarized light that has passed through the light source side polarizing plate;
A covering portion surrounding at least a part of the periphery of the light source,
The light source side polarizing plate is a reflective polarizing plate,
The said coating | coated part is a display apparatus which irregularly reflects the light from the said light source.   The display device according to claim 1, wherein the light source side polarizing plate is a wire grid polarizing plate in which a metal is formed on a part of the wire grid.   The display device according to claim 1, wherein the covering portion surrounds the light source with a reflection surface, and the reflection surface is subjected to diffuse reflection processing. The display polarizing plate includes a first display polarizing plate that presents information by being irradiated with a first polarized light having a first polarization direction as the specific direction, and a part of the first display polarizing plate. A second display polarizing plate that is provided so as to overlap and presents information by being irradiated with a second polarized light having a second polarization direction different from the first polarization direction as the specific direction. And
The light source side polarizing plate includes a first light source side polarizing plate that transmits polarized light in the first polarization direction and a second light source side polarizing plate that transmits polarized light in the second polarization direction. Item 4. The display device according to any one of Items 1 to 3.

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