Display device

Abstract

A display device (1) has a plurality of first light emitting elements (5), a substrate (3) having a first mounting surface (31) on which the plurality of first light emitting elements (5) are mounted, and a frame (2) having a display surface (21) on which a plurality of holes (22) are formed to pass through the outside and the inside, so that the substrate (3) is housed in a manner that the first mounting surface (31) is perpendicular to the display surface (21). The plurality of first light emitting elements (5) are mounted on the first mounting surface (31) in an orientation to emit light toward the holes (22).

Description

TECHNICAL FIELD

[0001] The present application relates to a display device using a light emitting element. BACKGROUND

[0002] A display device is used which displays numbers, characters, figures, and the like on the outside of a frame by making light emitted from a light emitting element provided inside the frame pass through a hole formed in the frame. In the following description, the entire surface of the outside of the frame, among which the numbers, characters, figures, and the like are displayed by making light pass through, is referred to as a display surface. Patent Document 1 discloses a display device in which a substrate having a light emitting element mounted on a mounting surface is provided inside a frame. In this display device, the light emitting element emits light in a direction perpendicular to the mounting surface. In addition, the substrate is housed inside the frame in such a manner that the mounting surface becomes parallel to the display surface of the frame. By this structure, light is emitted toward the display surface from the light emitting element.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-026385 SUMMARY

[0004] An electronic component other than the light emitting element is mounted on the mounting surface on which the light emitting element is mounted. The size of the mounting surface of the substrate becomes the size after adding the area on which the electronic component is mounted to the area on which the light emitting element is mounted. That is, the mounting surface of the substrate is formed larger than the area on which the light emitting element is mounted. In the display device disclosed in Patent Document 1, the substrate is housed inside the frame in such a manner that the mounting surface becomes parallel to the display surface, and thus there is a problem that the display surface cannot be reduced as compared with the mounting surface on which the light emitting element is mounted.

[0005] The present application has been made in view of the above-described circumstances, and has an object to obtain a display device capable of further reducing a display surface on which numbers, characters, figures, and the like are displayed by making light pass through.

[0006] To achieve the object and solve the problem described above, a display device includes a plurality of first light emitting elements, a substrate having a first mounting surface on which the plurality of first light emitting elements are mounted, and a frame having a display surface on which a plurality of holes are formed to pass through the outside and the inside, and the substrate is housed in such a manner that the first mounting surface becomes perpendicular to the display surface. The plurality of first light emitting elements are mounted on the first mounting surface in such a manner that they emit light toward the holes.

[0007] EFFECT OF THE INVENTION

[0008] The display device according to the present application has an effect that a display surface on which numbers, characters, figures, and the like are displayed by making light pass through can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1is a perspective view of the display device according to Embodiment 1 of the present application.

[0010] Figure 2 is an exploded perspective view of the display device according to Embodiment 1.

[0011] Figure 3 is a partial enlarged perspective view of the portion A shown in Figure 2

[0012] Figure 4 is a partial enlarged perspective view of the portion B shown in Figure 2

[0013] Figure 5 is a partial enlarged perspective view of the portion B shown in Figure 2

[0014] Figure 6 is a partial enlarged perspective view of the portion C shown in Figure 2

[0015] Figure 7 is a front view of the display device according to Embodiment 1, as viewed from the display surface side.

[0016] Figure 8 is a cross-sectional view taken along the line VIII-VIII shown in Figure 7

[0017] Figure 9 is a cross-sectional view taken along the line IX-IX shown in Figure 8

[0018] Figure 10 is a perspective view of the frame in Embodiment 1, as viewed from the back surface of the display surface, and is a partial enlarged perspective view of the portion in which the protrusion is formed.

[0019] Figure 11 is a perspective view of the frame in Embodiment 1, as viewed from the back surface of the display surface, and is a partial enlarged view of the portion in which the protrusion is formed.

[0020] Figure 12 is a perspective view of the first wall, the second wall, and the substrate in the display device according to Modified Example 1 of Embodiment 1, and is a view showing a state before the substrate is inserted into the gap.

[0021] Figure 13 is a perspective view of the first wall, the second wall, and the substrate according to Modified Example 1 of Embodiment 1, and is a view showing a state in which the substrate is inserted into the gap.

[0022] Figure 14 ​​​​​​This is a partial enlarged view of the substrate of the display device according to the modified example 2 of embodiment 1, showing the mounting portion of the first light-emitting element.

[0023] Figure 15 This is a cross-sectional view of the display device involved in Variation Example 2, which is consistent with... Figure 7 The diagram shows a cross-sectional view cut off along line VIII-VIII.

[0024] Figure 16 It is along Figure 7 The diagram shows a sectional view cut off along the XVI-XVI line. Detailed Implementation

[0025] The display device according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] Implementation method 1.

[0027] Figure 1 This is a perspective view of the display device according to Embodiment 1 of the present invention. Figure 2 This is an exploded perspective view of the display device according to Embodiment 1. The display device 1 is, for example, a servo amplifier. The display device 1 has a frame 2, a substrate 3, and a display surface sheet 4. The frame 2 is a housing that houses the substrate 3. One outer surface of the frame 2 is called the display surface 21. In this Embodiment 1, the display surface 21 is rectangular. In the following description, the direction along the long side of the display surface 21 is defined as the vertical direction, and the direction along the short side of the display surface is defined as the width direction. In addition, the direction perpendicular to the vertical and width directions is defined as the depth direction. Furthermore, the concepts of vertical, width, and depth directions are introduced for ease of explanation, and their directions will change according to the posture in which the display device 1 is used.

[0028] Figure 3 It is Figure 2 The image shows a magnified oblique view of part A. Multiple holes 22 are formed on the display surface 21, penetrating both the exterior and interior of the frame. In this embodiment 1, seven holes 22 are formed. The seven holes 22 are configured such that light passing through them can be displayed in seven segments.

[0029] Return to Figure 2The structure of substrate 3 will be described below. Substrate 3 has a first mounting surface 31 for mounting electronic components (not shown). The first mounting surface 31 of substrate 3 is quadrilateral in shape. Substrate 3 is housed inside frame 2 with the first mounting surface 31 perpendicular to the display surface 21 of frame 2. When viewed along the depth direction, substrate 3 is positioned to overlap with the area where a plurality of holes 22 are formed. Furthermore, the back side of the first mounting surface 31 becomes a second mounting surface 32.

[0030] Figure 4 It is Figure 2 The enlarged oblique view of part B shown is shown. A plurality of first light-emitting elements 5 are mounted on the first mounting surface 31 of the substrate 3. The plurality of first light-emitting elements 5 are arranged vertically along the edge of the first mounting surface 31 closest to the display surface 21. When viewed along the depth direction, each of the plurality of first light-emitting elements 5 is arranged vertically at a position overlapping any of the plurality of holes 22.

[0031] Multiple first light-emitting elements 5 are each mounted on the first mounting surface 31 with the orientation of emitting light toward the hole 22. The first light-emitting element 5 is, for example, a right-angle type LED (Light Emitting Diode).

[0032] Figure 5 It is Figure 2 The enlarged oblique view of part B shown is a diagram showing the second mounting surface of the substrate. A plurality of second light-emitting elements 6 are mounted on the second mounting surface 32 of the substrate 3. The plurality of second light-emitting elements 6 are arranged vertically along the edge of the second mounting surface 32 closest to the display surface 21. Each of the plurality of second light-emitting elements 6 is positioned in the arrangement direction of the plurality of second light-emitting elements 6 at a position overlapping any of the plurality of holes 22.

[0033] Multiple second light-emitting elements 6 are each mounted on the second mounting surface 32 with the orientation of emitting light toward the hole 22. The second light-emitting element 6 is, for example, a right-angle type LED.

[0034] Figure 6 It is Figure 2A partial enlarged view of the C portion is shown. The display surface sheet 4 is a sheet-shaped member that covers the display surface 21 of the frame 2. The display surface sheet 4 forms a plurality of transmissive portions 41 that transmit light in a portion that overlaps the hole 22 formed in the display surface 21. The transmissive portions 41 are formed of a transparent or translucent material. The display surface sheet 4 does not transmit light in regions other than the transmissive portions 41. For example, the entire display surface sheet 4 can be formed of a transparent or translucent material, and the regions other than the transmissive portions 41 can be painted, so that light is not transmitted in the regions other than the transmissive portions 41. The plurality of transmissive portions 41 are provided in a configuration that enables 7-segment display, similarly to the configuration of the plurality of holes 22. In the following description, the transmissive portions 41 among the plurality of transmissive portions 41 that have a shape extending in the up-and-down direction are referred to as first transmissive portions 41a, and the transmissive portions 41 that have a shape extending in the width direction are referred to as second transmissive portions 41b. In the display surface sheet 4, four first transmissive portions 41a and three second transmissive portions 41b are formed in order to perform 7-segment display.

[0035] Figure 7 is a front view of the display device according to Embodiment 1, as viewed from the display surface side. Figure 8 is a front view of the frame according to Embodiment 1, as viewed from the display surface side. Figure 7 is a cross-sectional view taken along the line VIII-VIII shown in FIG. 8. Figure 9 is a cross-sectional view taken along the line IX-IX shown in FIG. 9. Figure 8 is a cross-sectional view taken along the line IX-IX shown in FIG. 9.

[0036] A protrusion 7 that protrudes in the depth direction is formed in the region in which the hole 22 is formed, in the back surface 27 of the frame 2 that is the back surface of the display surface 21. The protrusion 7 has a first wall 23, a second wall 24, and a connecting wall 26.

[0037] Figure 10 is a front view of the frame according to Embodiment 1, as viewed from the back surface of the display surface, and is a partially enlarged view of a portion in which the protrusion is formed. Figure 11 is a front view of the frame according to Embodiment 1, as viewed from the back surface of the display surface, and is a partially enlarged view of a portion in which the protrusion is formed.

[0038] The first wall 23 extends from the periphery of the hole 22 toward the first light emitting element 5. The first wall 23 covers a region of a portion of the first mounting surface 31 of the substrate. The first wall 23 separates the plurality of holes 22 from each other in the back surface of the display surface 21. As shown in FIG. 6, the first wall 23 forms a plurality of first housing chambers 28 that separate the plurality of first light emitting elements 5 from each other, as viewed from the back surface 27 side. In this embodiment 1, one first light emitting element 5 is provided in an overlapping manner in one first housing chamber 28. Five first light emitting elements 5 are mounted on the first mounting surface 31. That is, five first housing chambers 28 are provided in the back surface of the display surface 21. Figure 9 As shown in FIG. 6, the first wall 23 forms a plurality of first housing chambers 28 that separate the plurality of first light emitting elements 5 from each other, as viewed from the back surface 27 side. In this embodiment 1, one first light emitting element 5 is provided in an overlapping manner in one first housing chamber 28. Five first light emitting elements 5 are mounted on the first mounting surface 31. That is, five first housing chambers 28 are provided in the back surface of the display surface 21.

[0039] The second wall 24 extends from the periphery of the hole 22 toward the second light emitting element 6. The second wall 24 covers the area of a part of the second mounting surface 32 of the substrate. The second wall 24 separates the plurality of holes 22 from each other on the back surface of the display surface 21. As shown, the second wall 24 forms a plurality of second housing chambers 29 that separate the plurality of second light emitting elements 6 from each other when viewed from the back surface 27 side. In this embodiment 1, one second light emitting element 6 is disposed in an overlapping manner in one second housing chamber 29. Five second light emitting elements 6 are mounted on the second mounting surface 32. That is, five second housing chambers 29 are provided on the back surface of the display surface 21. Figure 9

[0040] The connecting wall 26 connects the first wall 23 and the second wall 24. The connecting wall 26 has a smaller amount of protrusion from the back surface 27 than the first wall 23 and the second wall 24. Thus, the gap 25 is formed between the first wall 23 and the second wall 24.

[0041] The substrate 3 is positioned by inserting the end portion of the substrate 3 into the gap 25. That is, the gap 25 between the first wall 23 and the second wall 24 functions as a positioning portion that positions the substrate 3 in the width direction. The inserted substrate 3 abuts against the connecting wall 26. That is, the connecting wall 26 functions as a positioning portion that positions the substrate 3 in the depth direction.

[0042] In the display device 1 related to this embodiment 1, the first light emitting element 5 emits light toward the hole 22, and the second light emitting element 6 emits light toward the hole 22. Thus, even if the first mounting surface 31 is set in a posture perpendicular to the display surface 21 of the frame 2 and the substrate 3 is housed in the frame 2, it is possible to direct the light emitted from the first light emitting element 5 and the second light emitting element 6 toward the hole 22 provided in the display surface 21.

[0043] Thus, it is possible to make the light emitted from the first light emitting element 5 and the second light emitting element 6 pass through the hole 22 and the transmission portion 41 of the display surface sheet 4, and display seven segments in the display device 1. At this time, by making the light emitting elements that emit light different among the first light emitting element 5 and the second light emitting element 6, it appears that the desired transmission portion 41 emits light, and for example, it is possible to make the display device 1 display the numbers from 0 to 9. In the following description, the case where it appears that the transmission portion 41 emits light in order to display numbers and the like is simply referred to as the transmission portion 41 emits light, and the case where it does not appear that the transmission portion 41 emits light is simply referred to as the transmission portion 41 does not emit light.

[0044] ​In addition, the first mounting surface 31 on which the electronic components are mounted other than the first light emitting element 5 is not parallel to the display surface 21 but is perpendicular to the display surface 21, and thus the display surface 21 can be formed smaller than the first mounting surface 31. In addition, in a case where the display surface 21 is reduced in size, an area on which other electronic components are mounted can be ensured on the first mounting surface 31 which extends in the depth direction.

[0045] In addition, the plurality of first light emitting elements 5 are each housed in the first housing chamber 28, and the plurality of second light emitting elements 6 are each housed in the second housing chamber 29, and thus light from the first light emitting elements 5 and the second light emitting elements 6 is less likely to leak to other housing chambers. Thus, light is less likely to leak to the transmissive portions 41 other than the transmissive portions 41 in which the first light emitting elements 5 and the second light emitting elements 6 which emit light are housed in the first housing chamber 28 and the second housing chamber 29. Thus, the difference between the transmissive portions 41 which emit light and the transmissive portions 41 which do not emit light becomes clear, and the display of the display surface 21 can be made clearer. Furthermore, the substrate 3 which is inserted into the gap 25 between the first wall 23 and the second wall 24 also becomes a part of the wall which surrounds the first housing chamber 28 and the second housing chamber 29, and thus light leakage to the transmissive portions 41 which do not emit light is suppressed by the substrate 3 as well.

[0046] In addition, the substrate 3 is positioned by being inserted into the gap 25 which is provided between the first wall 23 and the second wall 24, and thus it is possible to prevent the display from becoming unclear due to the positions of the first light emitting elements 5 and the second light emitting elements 6 deviating and light not reaching the transmissive portions 41 sufficiently.

[0047] In addition, the substrate 3 is positioned by being inserted into the gap 25 only, and thus it is not necessary to use a jig or the like for positioning the substrate 3. The positioning of the substrate 3 can be easily performed without using a jig or the like, and thus it is possible to achieve an improvement in the assemblability of the display device 1.

[0048] Furthermore, the transmissive portions 41 of the display surface sheet 4 can be configured to diffuse light. For example, the incident surface of the transmissive portions 41 can be configured to diffuse light by being composed of a rough surface. In addition, the transmissive portions 41 can be formed of a material which easily diffuses light. Thus, the transmissive portions 41 as a whole become uniform in emitting light, and it is possible to achieve a display which is easy to observe while suppressing unevenness in brightness.

[0049] In addition, the opposite surface of the surface of the display surface sheet 4 which faces the display surface 21 of the frame 2 can be configured as a half mirror. Thus, the transmissive portions 41 which do not emit light are visually recognized as being the same as the areas other than the transmissive portions 41, and it is possible to appear that the transmissive portions 41 are not provided in the case where light is not emitted. On the other hand, in the case where the first light emitting elements 5 or the second light emitting elements 6 emit light, light passes through the half mirror and the transmissive portions 41 emit light. Thus, it is possible to increase the difference in appearance between the case where the transmissive portions 41 emit light and the case where the transmissive portions 41 do not emit light.

[0050] In addition, in Embodiment 1, an example in which the protrusions 7 are provided on the back surface 27 of the frame 2 is described, but the display device 1 can be configured without the protrusions 7. In the case where the protrusions 7 are not provided, the first wall 23 and the second wall 24 are not provided, and slight light leakage occurs to the transmissive portion 41 where no light is emitted, or the gap 25 is not provided, and positioning of the substrate 3 becomes slightly complicated, but if the first mounting surface 31 is perpendicular to the display surface 21, the effect of making the display surface 21 smaller than the first mounting surface 31 can be obtained. Further, in the case where the protrusions 7 are not provided, the display device 1 can be configured such that a protrusion is formed on one of the substrate 3 and the back surface 27 of the frame 2, and a recess into which the protrusion is fitted is formed on the other, and the substrate 3 is positioned by fitting the protrusion into the recess.

[0051] In addition, in Embodiment 1, an example in which the transmissive portion 41 emits light to enable display of a number by 7-segment display is described, but the shape and configuration of the transmissive portion 41 are not limited thereto, and the display device 1 can be configured such that the transmissive portion 41 emits light to enable display of a figure or characters.

[0052] Figure 12 FIG. 7 is a perspective view of the first wall, the second wall, and the substrate in the display device according to Modification 1 of Embodiment 1, and is a view showing a state before the substrate is inserted into the gap. Figure 13 FIG. 8 is a perspective view of the first wall, the second wall, and the substrate in the display device according to Modification 1 of Embodiment 1, and is a view showing a state in which the substrate is inserted into the gap.

[0053] In Modification 1, the cutout 33 is formed in the region of one side of the substrate 3 and inserted into the gap 25. When the substrate 3 is inserted into the gap 25, the connecting wall 26 of the protrusion 7 is fitted into the cutout 33. The positioning of the substrate 3 in the up-down direction by fitting the connecting wall 26 into the cutout 33 is performed on the basis of the positioning of the substrate 3 in the short-side direction by insertion of the substrate 3 into the gap 25. That is, the positioning of the substrate 3 is performed more accurately by insertion of the protrusion 7 into the substrate 3.

[0054] Figure 14 FIG. 9 is a partial enlarged view of the substrate in the display device according to Modification 2 of Embodiment 1, in which the mounting portion of the first light-emitting element is enlarged. In Modification 2, two of the five first light-emitting elements 5 mounted on the first mounting surface 31 are different from the other first light-emitting elements 5 in the distance from the display surface 21.

[0055] Specifically, the distance D1 between the first light-emitting element 5, which emits light toward the first light-emitting portion 41a, which is shaped to extend in the vertical direction among the plurality of light-emitting portions 41 formed in the display sheet 4, and the display surface 21 is greater than the distance D2 between the first light-emitting element 5, which emits light toward the second light-emitting portion 41b, which is shaped to extend in the width direction, and the display surface 21.

[0056] Figure 15 This is a cross-sectional view of the display device involved in Variation Example 2, which is consistent with... Figure 7 This is a diagram corresponding to the cross-sectional view taken along line VIII-VIII. When viewing the first light-emitting element 5 and the transmitting portion 41 in the vertical direction, the angle between the line perpendicular to the back surface 27 of the display surface 21 and the line along the incident direction of light from the first light-emitting element 5 to the transmitting portion 41 is defined as the incident angle θ. The closer this incident angle is to an obtuse angle, the more easily the brightness of the transmitting portion 41 through which light from the first light-emitting element 5 passes becomes uneven.

[0057] like Figure 15 As shown, distance D1 is set to distance D2, which means that the incident angle θ1 is considered to be greater than the incident angle θ2. Therefore, the incident angle θ2 can be set to a sharper angle, suppressing the unevenness of the brightness of the transmitted part 41, and making the display easier to observe.

[0058] Figure 16 It is along Figure 7 The diagram shows a sectional view cut off along the XVI-XVI line. Figure 16 The figure shows a cut-off portion of the second through section 41b of a shape extending in the width direction.

[0059] like Figure 14 As shown, the distance D2 between the first light-emitting element 5 emitting light towards the second transmission portion 41b and the display surface 21 is smaller than the distance D1 between the first light-emitting element 5 emitting light towards the first transmission portion 41a and the display surface 21. However, Figure 16 The distance D4 between the incident position of the light from the first light-emitting element 5 to the second transmitting portion 41b and the short side direction of the first light-emitting element 5 is greater than... Figure 15 The distance D3 between the incident position of the light from the first light-emitting element 5 to the first transmitting portion 41a and the width direction of the first light-emitting element 5 is small. Therefore, even if the distance D2 is reduced compared to the distance D1, the incident angle θ3 is less likely to become an obtuse angle. Thus, even if the first light-emitting element 5 emitting light towards the second transmitting portion 41b is positioned closer to the display surface 21 than the first light-emitting element 5 emitting light towards the first transmitting portion 41a, uneven brightness in the second transmitting portion 41b can be suppressed. By being closer to the display surface 21 than the first light-emitting element 5, sufficient brightness can be easily obtained through the second transmitting portion 41b even if the light amount of the first light-emitting element 5 is suppressed.

[0060] Further, based on the same reason as the first light emitting element 5, the second light emitting element 6 that emits light toward the first transmissive portion 41a is disposed at a position farther from the display surface 21 than the second light emitting element 6 that emits light toward the second transmissive portion 41b. More specifically, the first light emitting element 5 and the second light emitting element 6 are disposed at positions symmetrical with each other with the substrate 3 interposed therebetween.

[0061] The structure shown in the above embodiment represents one example of the gist of the present application, and can be combined with other known techniques, or a part of the structure can be omitted or changed without departing from the gist of the present application.

[0062] Explanation of Reference Numerals

[0063] 1 display device, 2 frame, 3 substrate, 4 display surface sheet, 5 first light emitting element, 6 second light emitting element, 7 protrusion, 21 display surface, 22 hole, 23 first wall, 24 second wall, 25 gap, 26 connecting wall, 27 back surface, 28 first housing chamber, 29 second housing chamber, 31 first mounting surface, 32 second mounting surface, 33 cutout, 41 transmissive portion, 41a first transmissive portion, 41b second transmissive portion.

Claims

1. A display device, characterized in that, have: Multiple first light-emitting elements; A substrate having a first mounting surface on which a plurality of the first light-emitting elements are mounted; as well as The frame has a display surface with multiple holes that extend through the exterior and interior, and accommodates the substrate in such a manner that the first mounting surface is perpendicular to the display surface. The plurality of the first light-emitting elements are mounted on the first mounting surface with an orientation toward emitting light toward the hole. At least one of the plurality of first light-emitting elements is at a different distance from the other first light-emitting elements, measured from the display surface along the depth direction perpendicular to the display surface. The display device has: A plurality of second light-emitting elements are mounted on the back side of the first mounting surface of the substrate, i.e., the second mounting surface, and emit light toward the hole; as well as A protrusion is formed in the region on the back side of the display surface where the hole is formed, protruding along the depth direction. The protrusion has: a first wall extending from around the holes toward the first light-emitting element, separating the plurality of holes from each other; a second wall extending from around the holes toward the second light-emitting element, separating the plurality of holes from each other; and a connecting wall connecting the first wall and the second wall. The connecting wall protrudes less from the back of the display surface compared to the first wall and the second wall, forming a gap between the first wall and the second wall. The substrate is positioned by inserting the end of the substrate into the gap, thereby abutting the substrate against the connecting wall.

2. The display device according to claim 1, characterized in that, Each of the plurality of first light-emitting elements, when viewed along the depth direction, is arranged in the vertical direction at a position overlapping any of the plurality of holes.

3. The display device according to claim 1 or 2, characterized in that, At least one of the plurality of second light-emitting elements is at a different distance from the display surface, measured from the display surface in a direction perpendicular to the display surface, than the other second light-emitting elements.

4. The display device according to any one of claims 1 to 3, characterized in that, The substrate is provided with a positioning part for positioning the substrate.

5. The display device according to any one of claims 1 to 4, characterized in that, It also has a display sheet that covers the display surface. The display sheet has a light-transmitting portion in the part that overlaps with the hole. The transmissive portion is formed of a light-diffusing material.

6. The display device according to any one of claims 1 to 4, characterized in that, It also has a display sheet that covers the display surface. The display sheet has a light-transmitting portion in the part that overlaps with the hole. The transmissive part is a semi-reflective mirror.

Images