JP2019028360A - Display device - Google Patents

Abstract

To provide a display device capable of irradiating a display mark with even luminance distribution light and suppressing uneven display luminance on the display mark.SOLUTION: A display device 1 comprises: at least one display part (first display part 30 or second display part 40) having a mark part selectively transmitting light oscillating in a specific direction; and at least one light source part (first light source part 5 or second light source part 6) emitting light travelling toward the display part. The light source part includes: a light-emitting element (first light-emitting element 10 or second light-emitting element 20) emitting light; an optical element 100 changing an optical path of, or the direction of light emitted from the light-emitting element toward the mark part of the display part; and a polarization part (first polarization part 15 or second polarization part 25) transmitting light oscillating in a specific direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  As a conventional technique, a means for changing the polarization of light, a polarizing section arranged adjacent to the means for changing the polarization of light, and a means for changing the polarization of light and the polarizing section There is known a display device provided with means for diffusing the arranged light (see, for example, Patent Document 1). In this display device, the means for diffusing light is disposed between the liquid crystal cell as the light source and the polarizing unit.

  As a means for diffusing this light, a lens such as a cylindrical lenticular array is desirable.

Japanese Unexamined Patent Publication No. 62-175711

  However, the display device of Patent Document 1 only describes the arrangement of the lens, and does not describe what characteristic the lens characteristic is. For this reason, even if the conventional technology is applied to a display device provided with a light source that emits polarized light that transmits light having the same polarization direction as that of the polarization unit, the display mark formed on the polarization unit is displayed. There is a possibility that light cannot be collected on the mark and unevenness in display luminance in the display mark occurs.

  Accordingly, an object of the present invention is to provide a display device capable of irradiating light with a uniform luminance distribution on a display mark and suppressing uneven display luminance on the display mark.

[1] To achieve the above object, at least one display unit having a mark unit that selectively transmits light oscillating in a specific direction, and at least one light source unit that emits light toward the display unit. The light source unit emits the light, an optical element that changes the direction of the light emitted from the light emitting element toward the mark unit of the display unit, and vibrates in the specific direction. Provided is a display device comprising a polarizing section that transmits the light.

[2] The display device according to [1], wherein the optical element is configured to have a uniform luminance distribution in the mark portion.

[3] The optical device may be the display device according to the above [1] or [2], which is disposed between the light emitting device and the polarizing unit.

[4] The display device according to any one of [1] to [3], wherein the optical element is a lens.

[5] In addition, the display unit includes at least two or more display units, and the display unit includes the mark units that form different display marks with different directions as the specific directions, and the light source unit includes the display unit. The display device according to any one of [1] to [4] may be provided.

  According to the display device of the present invention, it is possible to irradiate the display mark with light having a uniform luminance distribution, and to suppress display luminance unevenness in the display mark.

FIG. 1A is a cross-sectional view of a display device according to an embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view of FIG. FIG. 2 is an enlarged view of a portion B shown in FIG. FIG. 3A is a plan view of the first display unit viewed from the direction A in FIG. 1A, and FIG. 3B is a plan view of the second display unit. FIG. 4 is a cross-sectional view of the display device corresponding to FIG. FIG. 5A is an upper plan view showing a state in which the display mark of the first display unit is displayed when the first light emitting element is caused to emit light, and FIG. 5B is an irradiation from the first light emitting element. It is sectional drawing which shows the path | route of performed light. FIG. 6A is an upper plan view showing a state in which the display mark of the second display unit is displayed when the second light emitting element emits light, and FIG. 6B is an irradiation from the second light emitting element. It is sectional drawing which shows the path | route of performed light.

(Embodiment of the present invention)
The display device 1 according to the embodiment of the present invention includes at least one display unit (the first display unit 30 or the second display unit 40) having a mark unit that selectively transmits light that vibrates in a specific direction. At least one light source unit (first light source unit 5 or second light source unit 6) that emits light toward the display unit, and the light source unit emits light (first light emitting device 10 or second light emitting device). 20), an optical element 100 that changes the direction of light emitted from the light emitting element toward the mark portion of the display unit, and a polarizing unit that passes light oscillating in a specific direction (first polarizing unit 15 or second polarizing unit 15). And a polarizing unit 25). Also, the display unit includes at least two or more display units, the display unit includes mark units having different directions as specific directions, different display marks are formed, and the number of light source units is equal to the number of display units. Also good.

  The display device 1 according to the embodiment of the present invention includes a first display unit and a second display unit as display units, and includes a first light emitting element unit and a second light emitting element unit corresponding to the two display units. The configuration will be described below.

  As shown in FIG. 1A, the display device 1 has a display mark formed on the upper side of the lower panel 50, and selectively receives light from the light source unit (the first light source unit 5 or the second light source unit 6). Transparent display units (first display unit 30 and second display unit 40) are attached in an overlapping manner. Also, on the lower side of the lower panel 50, a first polarizing unit 15 and a second polarizing unit for converting the light from the light source unit (the first light source unit 5 or the second light source unit 6) into light having polarization directions orthogonal to each other. 25 are mounted side by side.

  The display device 1 emits light from the first light emitting element 10 so that the light transmitted through the first polarizing unit 15 is selectively transmitted through the display unit (the first display unit 30 and the second display unit 40), 1 Display mark is displayed. Further, the display device 1 emits light from the second light emitting element 20 so that light transmitted through the second polarizing unit 25 is selectively transmitted through the display unit (the first display unit 30 and the second display unit 40). The second display mark is switched and displayed.

(First light source unit 5, first light emitting element 10)
For example, an LED or the like can be used as the first light emitting element 10. In the present embodiment, an LED element is used as the first light emitting element 10, and the first light source unit 5 is configured by arranging the first polarizing unit 15 and the optical element 100 (convex lens) in the emission unit. The first light emitting element 10 is mounted on the substrate 82 and assembled to the body unit 80 as shown in FIG.

  The first light emitting element 10 passes through the first polarizing unit 15 attached to the lower panel 50, and emits light having a polarization direction in the first polarization direction 19 shown in FIGS. 3 (a) and 3 (b). The light emitted from the first light emitting element 10 through the first polarizing unit 15 selectively transmits through the respective polarizing regions or non-polarizing regions of the first display unit 30 and the second display unit 40.

(First polarization unit 15)
The first polarizing unit 15 has a polarizing function and is formed in a plate shape. In the present embodiment, the first polarizing unit 15 is substantially rectangular.

  The first polarization unit 15 allows light in the first polarization direction 19 shown in FIGS. 3A and 3B to pass and reflects or absorbs light in other polarization directions. Accordingly, the light of the first light emitting element 10 that has passed through the first polarization unit 15 is light that vibrates in a specific direction, and is linearly polarized light having a polarization component in the first polarization direction 19.

(Second light source unit 6, second light emitting element 20)
For example, an LED or the like can be used as the second light emitting element 20. In the present embodiment, an LED element is used as the second light emitting element 20, and the second light source unit 6 is configured by arranging the second polarizing unit 25 and the optical element 100 (convex lens) in the emission unit. The second light emitting element 20 is mounted on the substrate 82 and assembled to the body unit 80 as shown in FIG.

  The second light emitting element 20 passes through the second polarizing unit 25 attached to the lower panel 50, and emits light having a polarization direction in the second polarization direction 29 shown in FIGS. 3 (a) and 3 (b). The light emitted from the second light emitting element 20 through the second polarizing unit 25 selectively transmits through the respective polarizing regions or non-polarizing regions of the first display unit 30 and the second display unit 40.

(Second polarization unit 25)
The second polarizing portion 25 has a polarizing function and is formed in a plate shape. In the present embodiment, the second polarizing unit 25 is substantially rectangular.

  The second polarization unit 25 transmits light having the second polarization direction 29 shown in FIGS. 3A and 3B and reflects or absorbs light having another polarization direction. Therefore, the light of the second light emitting element 20 that has passed through the second polarizing unit 25 is light that vibrates in a specific direction, and is linearly polarized light having a polarization component in the second polarization direction 29.

  As shown in FIG. 4, the first polarization unit 15 and the second polarization unit 25 are assembled to the body unit 80 in a positional relationship in which the first polarization direction 19 and the second polarization direction 29 are orthogonal to each other.

(Optical element 100)
The optical element 100 is disposed between the first light emitting element 10 and the first polarizing unit 15 and between the second light emitting element 20 and the second polarizing unit 25, and displays the direction of light emitted from the light emitting element as a display unit (first display). The optical path is changed toward the mark part of the part 30 and the second display part 40). Hereinafter, the optical path change of the light on the first light source unit 5 side will be described, but the same applies to the second light source unit 6 side.

  As shown in FIG. 1B, the light beam L1 at the center of the light emitted from the first light emitting element 10 is applied to the mark portion of the display unit (the first display unit 30 and the second display unit 40) by the optical element 100. The optical path is changed to become light of the light beam L2. Note that the direction of the light beam L2 only needs to be a result of the optical path change from the direction of the light beam L1 to the mark portion of the display unit (the first display unit 30 and the second display unit 40). Need not match the mark portion of the display portion.

  As shown in FIG. 2, the optical element 100 can use a convex lens, for example. The peripheral area is used from the center CL of the convex lens. When light is incident on the optical element 100 from the first light emitting element 10, the light path of each light beam is changed in the direction of the center CL of the lens by entering and exiting the optical element 100.

  For example, as shown in FIG. 2, typically, five light beams L1a, L1b, L1c, L1d, and L1e are emitted from the first light emitting element 10 in a predetermined light distribution direction, and then to the optical element 100. Incident. From the optical element 100, five light beams L2a, L2b, L2c, L2d, and L2e are emitted in a predetermined light distribution direction after being changed in accordance with Snell's law. As shown in FIG. 1A, when the central light beam L1 of the light distribution of the first light emitting element 10 is changed in the direction of L2, the light of the first light emitting element 10 is distributed in the direction of the light beam L2. The approximate center of In FIG. 2, L1c corresponds to L1, and L2c corresponds to L2.

  Further, by designing the surface shape such as the curvature of the incident surface 100a and the exit surface 100b of the optical element 100, the light distribution (brightness distribution) of light centered on the light beam L2 emitted from the first light emitting element 10 is substantially reduced. It can also be made uniform. As a result, the display mark can be irradiated with light having a uniform light distribution (brightness distribution).

(Modification)
As shown in FIG. 4, different optical elements 100 may be arranged in the first light source unit 5 and the second light source unit 6. That is, a part of the convex lens shown above may be disposed as the optical elements 101 and 102 at the emission portions of the first light emitting element 10 and the second light emitting element 20, respectively. The optical element 100 is not limited to a convex lens, and may be other optical path changing means as long as the optical path can be changed. For example, the optical element 100 may be a prism or the like.

(First display unit 30)
The first display unit 30 has a mark part that selectively transmits light oscillating in a specific direction, and a display mark is formed. The mark portion is a polarizing region 31 shown below, and a display mark is formed by the polarizing region 31 and a non-polarizing region 32 other than the polarizing region.

  The 1st display part 30 is a polarizing plate provided with the polarization function and formed in plate shape, and functions as a presentation filter. In the present embodiment, the first display unit 30 is rectangular. The first display unit 30 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.

  As shown in FIG. 3A, the first display unit 30 does not transmit linearly polarized light polarized in the first polarization direction 19 but transmits linearly polarized light polarized in the second polarization direction 29. The polarization region 31 and a non-polarization region 32 that transmits light regardless of the polarization state are included. Therefore, the 1st display part 30 selectively permeate | transmits the light from the light source parts 5 and 6, and functions as a presentation filter. For example, as shown in FIG. 3A, the polarization region 31 and the non-polarization region 32 are formed as display marks in which the non-polarization region 32 is formed in a round shape. It can be. In addition, it arrange | positions so that at least one part may overlap with the display mark formed in the 2nd display part 40 mentioned later.

(Second display unit 40)
The second display part 40 has a mark part that selectively transmits light oscillating in a specific direction, and a display mark is formed. The mark portion is a polarization region 41 shown below, and a display mark is formed by the polarization region 41 and a non-polarization region 42 other than the polarization region.

  The 2nd display part 40 is a polarizing plate provided with the polarization function and formed in plate shape, and functions as a presentation filter. The second display unit 40 is rectangular in the present embodiment. The second display unit 40 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.

  As shown in FIG. 3B, the second display unit 40 transmits the linearly polarized light polarized in the first polarization direction 19 and does not transmit the linearly polarized light polarized in the second polarization direction 29. The region 41 and the non-polarized region 42 that transmits light regardless of the polarization state are included. Therefore, the 2nd display part 40 selectively permeate | transmits the light from the light source parts 5 and 6, and functions as a presentation filter. For example, as shown in FIG. 3B, the polarization region 41 and the non-polarization region 42 are formed as display marks in which the non-polarization region 42 is formed in an X shape, and various marks, characters, figures, etc. It can be. In addition, it arrange | positions so that at least one part may overlap with the display mark formed in the 1st display part 30 mentioned above.

  In the state where the first display unit 30 and the second display unit 40 are assembled, the non-polarized region 32 (circle shape) of the first display unit 30 and the second display unit 40 shown in FIGS. The non-polarization regions 42 (x shape) are arranged so that at least a part thereof overlaps. In addition, the first display unit 30 and the second display unit 40 are assembled in a positional relationship in which the first polarization direction 19 and the second polarization direction 29 are orthogonal so that different directions are specified directions (polarization directions). ing.

  In the state where the first display unit 30 and the second display unit 40 are assembled, the center of the display unit (the first display unit 30 and the second display unit 40) is C, and FIGS. a), as shown in FIG.

(Display operation of display mark formed on first display unit 30)
When the first light emitting element 10 emits light, as shown in FIG. 5B, the light L1 having the polarization direction in the first polarization direction 19 from the first light emitting element 10 through the first polarizing unit 15 (the light distribution L1 is distributed). The light having the center of the distribution is emitted. The optical path of the light L1 is changed by the optical element 100, and as shown in FIG. 5B, the light L2 (light beam) traveling toward the center C of the display unit (the first display unit 30 and the second display unit 40). Light having L2 as the center of the light distribution.

  The light L2 is applied to the first display unit 30 and the second display unit 40. Since the light L2 has a polarization direction in the first polarization direction 19, it passes through the non-polarization region 32 of the first display unit 30 and the entire region of the second display unit 40. Therefore, the display mark (circle shape) of the non-polarization region 32 shown in FIG. Areas other than the non-polarized area 32 do not transmit the light L2 and are therefore not displayed.

  In the display operation of the display mark (circle shape) described above, the light L2 irradiated to the first display unit 30 and the second display unit 40 is obtained by changing the optical path of the emitted light L1 of the first light emitting element 10. The center of the light L2 is the approximate center of the light distribution. Further, since the light has a uniform light distribution (brightness distribution) due to the surface shape of the optical element 100, the display mark can be irradiated with light having a uniform luminance distribution. Thereby, the display mark (circle shape) can be displayed while suppressing display luminance unevenness.

(Display operation of display mark formed on second display unit 40)
When the second light emitting element 20 emits light, as shown in FIG. 6B, the light L3 having a polarization direction in the second polarization direction 29 from the second light emitting element 20 through the second polarizing unit 25 (the light distribution L3 is distributed). The light having the center of the distribution is emitted. The optical path of the light L3 is changed by the optical element 100, and as shown in FIG. 6B, the light L4 (light beam) traveling toward the center C of the display unit (the first display unit 30 and the second display unit 40). Light having L4 as the center of the light distribution).

  The light L4 is applied to the first display unit 30 and the second display unit 40. Since the light L4 has a polarization direction in the second polarization direction 29, the light L4 is transmitted through the non-polarization region 42 of the second display unit 40 and the entire region of the first display unit 30. Therefore, the display mark (x shape) of the non-polarization region 42 shown in FIG. 6A is displayed. Areas other than the non-polarized area 42 do not transmit the light L4 and are therefore not displayed.

  In the display operation of the display mark (x shape) described above, the light L4 irradiated to the first display unit 30 and the second display unit 40 is obtained by changing the optical path of the emitted light L3 of the second light emitting element 20. The center of the light L4 is the approximate center of the light distribution. Further, since the light has a uniform light distribution (brightness distribution) due to the surface shape of the optical element 100, the display mark can be irradiated with light having a uniform luminance distribution. Thereby, the display mark (x shape) can be displayed while suppressing display luminance unevenness.

(Effect of embodiment)
The embodiment of the present invention has the following effects.
(1) The display device 1 according to the present embodiment includes at least one display unit (the first display unit 30 or the display unit having a mark unit that selectively transmits light oscillating in a specific direction. 2nd display part 40) and at least 1 light source part (the 1st light source part 5 or the 2nd light source part 6) which emits the light which goes to a display part, and a light source part emits light (1st light source element). The light emitting element 10 or the second light emitting element 20), the optical element 100 that changes the direction of the light emitted from the light emitting element toward the mark portion of the display unit, and the polarizing unit that passes light oscillating in a specific direction ( 1st polarizing part 15 or the 2nd polarizing part 25). Thereby, the center of the light distribution of the light emitted from the light emitting element can be set to the center of the display unit. In addition, the optical element 100 can irradiate the display mark with light having a uniform luminance distribution, and can suppress uneven display luminance in the display mark.
(2) Although the above-described suppression of uneven display luminance is effective even when there is only one display unit, it is also effective in a configuration including two or more display units. Thereby, it has an effect in the brightness nonuniformity reduction at the time of applying the display apparatus 1 which concerns on this Embodiment to a switching display.
(3) The optical element 100 is configured to be disposed between the first light emitting element 10 and the first polarizing unit 15 and between the second light emitting element 20 and the second polarizing unit 25. Accordingly, it is possible to avoid the problem that the display switching function is lost due to the rotation of the polarization axis due to the birefringence effect of the lens, and it is possible to maintain the display quality of the display mark by the display switching high.

  While the embodiments and modifications of the present invention have been described above, these embodiments are merely examples, and do not limit the invention according to the claims. 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, 5 ... 1st light source part, 6 ... 2nd light source part, 10 ... 1st light emitting element, 15 ... 1st polarizing part, 19 ... 1st polarization direction, 20 ... 2nd light emitting element, 25 ... 1st 2 polarization sections, 29... Second polarization direction, 30... First display section, 31... Polarization area, 32 .. non-polarization area, 40. 80 ... body unit, 100 ... optical element, 100a ... incident surface, 100b ... exit surface, C ... center, CL ... center of lens

Claims (5)

At least one display portion having a mark portion that selectively transmits light oscillating in a specific direction;
And at least one light source unit that emits light toward the display unit,
The light source unit includes: a light emitting element that emits the light; an optical element that changes an optical path of the light emitted from the light emitting element toward the mark unit of the display unit; and the light that vibrates in the specific direction. And a polarizing unit that passes through.   The display device according to claim 1, wherein the optical element is configured to have a uniform luminance distribution in the mark portion.   The display device according to claim 1, wherein the optical element is disposed between the light emitting element and the polarizing unit.   The display device according to claim 1, wherein the optical element is a lens. Including at least two or more display units,
The display unit includes the mark unit that forms different display marks with different directions as the specific direction,
The display device according to claim 1, wherein the number of the light source units is equal to the number of the display units.