JP2017157370A - Light guide unit, surface light source device, and display input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide unit having a simplified structure.SOLUTION: A light guide unit 21 includes: a light guide plate 22 that includes an incident surface into which light is made incident, an emission surface 22b that crosses the incident surface and from which light is emitted, and a back surface 22c opposite to the emission surface 22b, and that is configured to guide light incident from the incident surface toward a light guide direction, and then emit the light from the emission surface 22b; and an operation position detection unit 23 on which an electrode configured to detect electric change of a position that a user operated for the light guide plate 22 is laminated on at least one side of the back surface 22c and emission surface 22b of the light guide plate 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light guide unit, a surface light source device, and a display input device.

  2. Description of the Related Art Conventionally, a front light type display device that illuminates a reflective display unit including a liquid crystal display panel and a reflective plate from a display surface side with a surface light source device is known. This display device displays video information by reflection of external light in a bright place, and displays video information by illumination of a surface light source device in a dark place (see, for example, Patent Document 1).

JP-A-6-324331

A device (hereinafter also referred to as “display input device”) in which not only video information is displayed but also various operations can be input by adding a touch panel function to the surface light source device described above has been put into practical use. Such a display input device is used for electronic devices, such as electronic paper and a smart phone, for example. When a gesture with a user's finger or the like is detected on the touch panel, these electronic devices execute an operation corresponding to the gesture.
In the display input device described above, the structure of the light guide unit that combines the surface light source device and the touch panel is simplified, the overall thickness and weight are reduced, the brightness is increased, the mounting process is simplified, and the material cost is reduced. Realization of reduction and the like is required.

  The subject of this invention is providing the light guide unit, the surface light source device, and the display input device which simplified the structure more.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate. Moreover, you may substitute at least one part for another structure.
The first invention includes a light incident surface (22a) on which light is incident, a light exit surface (22b) that intersects the light incident surface and emits light, and a back surface (22c) that faces the light exit surface. A light guide plate (22) that exits from the light exit surface while guiding light incident from the entry light surface in the light guide direction, and an electrode that detects an electrical change in a position operated by a user with respect to the light guide plate. And an operation position detector (23) stacked on at least one of the back surface and the light exit surface of the light guide plate.
-2nd invention is the light guide unit (21) of 1st invention, Comprising: The said operation position detection part (23) is laminated | stacked and used on the said back surface (22c) side of the said light-guide plate (22). A first electrode (231) for detecting an electrical change in a position operated by a user and a light output surface (22b) side of the light guide plate are stacked, and an electrical change in a position operated by a user is detected. And a second electrode (233).
-3rd invention is the light guide unit (21) of 1st invention, Comprising: The said operation position detection part (23) detects the electrical change of the position which the user operated (1st electrode ( 231) and a second electrode (233) that is electrically insulated from the first electrode and detects an electrical change in a position operated by a user, wherein the first electrode and the second electrode are The light guide unit is laminated on the back surface (22c) side of the light guide plate (22).
-4th invention is the light guide unit (21) of 1st invention, Comprising: The said operation position detection part (23) detects the electrical change of the position which the user operated (1st electrode ( 231) and a second electrode (233) that is electrically insulated from the first electrode and detects an electrical change in a position operated by a user, wherein the first electrode and the second electrode are The light guide unit is laminated on the light exit surface (22b) side of the light guide plate (22).
The fifth invention is the light guide unit (21) of any one of the first to fourth inventions, wherein the light guide plate (22) has the light incident surface (22b) at the light incident surface (22b). A plurality of light extraction shapes (122) that emit at least part of the light incident on 22a), and an optical resin layer (25) that covers the plurality of light extraction shapes and has a flat surface on the light emission surface side. It is provided with the light guide unit characterized by comprising.
-6th invention is a light guide unit (21) of 5th invention, Comprising: The said optical resin layer (25) is a refractive index adjustment layer, It is a light guide unit characterized by the above-mentioned.
The seventh invention is provided at a position facing the light guide unit (21) of any one of the first to sixth inventions and the light incident surface (22a) of the light guide plate (22). A surface light source device (20) comprising: a light source unit (26) for projecting light onto a writing light surface.
The eighth invention is a display input device (1) comprising the surface light source device (20) of the seventh invention and a reflective display section (10) disposed on the light output surface side of the surface light source device. is there.

  ADVANTAGE OF THE INVENTION According to this invention, the light guide unit, the surface light source device, and display input device which simplified the structure more can be provided.

It is a perspective view of the display input device 1 in a 1st embodiment. It is a schematic sectional drawing of the display input device 1 in 1st Embodiment. It is a figure explaining the surface light source device 20 of 1st Embodiment. It is a disassembled perspective view which shows the structure of the light guide unit 21 of 1st Embodiment. It is a top view at the time of seeing the light-guide plate 22 with which the touchscreen 23 was laminated | stacked from the back surface 22c side. It is a schematic sectional drawing of the display input device 1A in 2nd Embodiment. It is a disassembled perspective view which shows the structure of 21 A of light guide units of 2nd Embodiment. It is a schematic sectional drawing of the display input device 1B in 3rd Embodiment. It is a disassembled perspective view which shows the structure of the light guide unit 21B of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding. Moreover, in each figure of embodiment, the hatching which shows the cross section of a member is abbreviate | omitted suitably.
Numerical values such as dimensions and material names of each member described in the present specification are examples as embodiments, and are not limited thereto, and may be appropriately selected and used.

(First embodiment)
FIG. 1 is a perspective view of a display input device 1 according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the display input device 1 according to the first embodiment. FIG. 3 is a diagram illustrating the surface light source device 20 of the first embodiment. FIG. 3A is a plan view when the light guide plate 22 is viewed from the back surface 22c side. FIG. 3B is a schematic cross-sectional view illustrating the optical path of light incident on the light guide plate 22 and the reflective display unit 10. FIG. 4 is an exploded perspective view showing the configuration of the light guide unit 21 of the first embodiment. FIG. 5 is a plan view when the light guide plate 22 on which the touch panel 23 is laminated is viewed from the back surface 22c side.

  In each drawing including FIG. 1, in order to facilitate understanding, two directions that are parallel to the screen of the display input device 1 and are orthogonal to each other in the use state of the display input device 1 are X directions (X1). -X2 direction) Y direction (Y1-Y2 direction), and a direction orthogonal to the screen of the display input device 1 is a Z direction (Z1-Z2 direction). In the Z direction, the Z1 side is the back side, and Z2 is the observer side.

  As shown in FIG. 1, the display input device 1 includes a reflective display unit 10 and a surface light source device 20. The display input device 1 is a front light type display input device that can be illuminated by the surface light source device 20 from the display surface side of the reflective display unit 10. The display input device 1 of this embodiment is used for electronic paper, a smart phone, etc., for example. The display input device 1 is not limited to the configuration described in the present embodiment, and may be configured to include members such as an antireflection layer and a diffusion sheet, for example.

The reflective display unit 10 is a device that displays video information on the display surface 10a. As shown in FIG. 2, the reflective display unit 10 includes a liquid crystal display panel 11 and a reflective plate 12.
The liquid crystal display panel 11 is a display device that forms video information on the display surface 10a. The external shape of the liquid crystal display panel 11 and the display surface 10a are rectangular when viewed from the Z direction, and have two parallel long sides facing the X direction and two parallel short sides facing the Y direction.

  The reflection plate 12 is a sheet-like member capable of reflecting light, and is disposed on the back side (Z1 side) of the liquid crystal display panel 11. The shape and size of the reflecting plate 12 when viewed from the Z direction are substantially the same as those of the liquid crystal display panel 11. As shown in FIG. 3A, the reflecting plate 12 reflects light L1 from the outside and passes it from the back side of the liquid crystal display panel 11 to the viewer side (Z2 side). Further, the reflecting plate 12 reflects light L2 projected from the light source unit 26 (described later) in the same manner as the light L1, and allows the liquid crystal display panel 11 to pass from the back side to the viewer side (Z2 side).

The surface light source device 20 is a device that illuminates the reflective display unit 10 from the front side. As illustrated in FIG. 2, the surface light source device 20 includes a light guide unit 21 and a light source unit 26.
The light guide unit 21 includes a light guide plate 22, a touch panel (operation position detection unit) 23, a protective layer 24, and a transparent resin layer (optical resin layer) 25.

  The light guide plate 22 is a sheet-like member that emits light incident from the light source unit 26 toward the reflective display unit 10 side (Z1 side) from the light output surface 22b (described later) while guiding the light incident in the light guide direction (X2 direction). It is. As shown in FIG. 3B, the light guide plate 22 has two parallel long sides facing each other in the X direction and two parallel short sides facing each other in the Y direction. The material that can be used as the light guide plate 22 is, for example, a thermoplastic resin having optical transparency such as an acrylic resin, a COP (cycloolefin polymer) resin, and a PC (polycarbonate) resin.

  As shown in FIG. 3A, the light guide plate 22 has a light incident surface 22a, a light output surface 22b, and a back surface 22c. The light incident surface 22 a is a surface provided at the end of the light guide plate 22 in the X1 direction. The light incident surface 22a faces the light source unit 26, and the light L2 projected from the light source unit 26 is incident thereon. The light exit surface 22b is a surface that intersects the light entrance surface 22a. The light exit surface 22b faces the display surface 10a of the liquid crystal display panel 11, and the light L1 and L2 are emitted. The back surface 22c is a surface facing the light exit surface 22b. Light L1 from the outside is incident on the back surface 22c.

  As illustrated in FIG. 3B, the light guide plate 22 includes a plurality of unit optical shapes (light extraction shapes) 122 on the surface on the light exit surface 22 b side. The unit optical shape 122 is a portion from which light incident on the light incident surface 22a from the light source unit 26 and guided through the light guide plate 22 is extracted. The unit optical shapes 122 in the present embodiment are cylindrical, and are arranged in a matrix at equal intervals in the X direction and the Y direction of the light exit surface 22b.

  As shown in FIG. 3A, the light L2 projected from the light source unit 26 and incident on the light guide plate 22 from the light incident surface 22a is guided while repeating total reflection between the light exit surface 22b and the back surface 22c. It is guided in the direction (X2 direction). The light L2 guided in the light guide direction is emitted to the liquid crystal display panel 11 (reflective display unit 10) side from each position of the plurality of unit optical shapes 122 provided on the light exit surface 22b. Since the light L2 is totally reflected between the light exit surface 22b and the back surface 22c, the light L2 is hardly emitted from a portion other than the unit optical shape 122 and is mainly emitted from the side surface of the unit optical shape 122. In FIG. 3A, a part of a touch panel 23 (described later) constituting the light guide unit 21 and description of the reference numerals are omitted.

  As shown in FIG. 3A, the lights L1 and L2 emitted from the light guide plate 22 (surface light source device 20) pass through the liquid crystal display panel 11, are reflected by the reflection plate 12, and are again reflected in the liquid crystal display panel 11. Passes from the back side to the observer side (Z2 side). Therefore, the observer can observe the video information formed on the liquid crystal display panel 11 with the light L1 from the outside in a bright place. In addition, the observer can observe the video information formed on the liquid crystal display panel 11 by the light L2 projected from the light source unit 26 in a dark place.

  The touch panel 23 is a device that detects a position operated by the user with respect to the light guide plate 22. As shown in FIG. 2, the touch panel 23 includes a first electrode 231, a first support layer 232, a second electrode 233, and a second support layer 234. The touch panel 23 of the present embodiment is a touch panel compatible with a projection-type capacitance method.

  The first electrode 231 is a transparent electrode that detects a change in voltage due to the capacitance at the position operated by the user, and is formed on the back surface 22c side of the light guide plate 22 as shown in FIG. As shown in FIG. 4, the first electrode 231 has a rectangular first electrode pattern 231a continuously arranged in the X direction on a first support layer 232 (described later). In the first electrode 231, the first electrode patterns 231a continuous in the column direction (X direction) are electrically connected to each other. In the first electrode 231, the first electrode patterns 231a adjacent to each other in the row direction (Y direction) are electrically insulated from each other.

  FIG. 4 shows an example in which five rows of first electrodes 231 including ten first electrode patterns 231a are arranged. The first electrode 231 includes a lead electrode 231b at one end (X2 side) in the X direction. The extraction electrode 231b is an electrode for extracting a change in voltage due to the capacitance at the position operated by the user as a signal. The extraction electrode 231b is connected to a control circuit (not shown) via an FPC (flexible printed circuit board) or the like. In FIG. 4 and the like, the wiring patterns of the extraction electrodes 231b and 233b (described later) are schematically shown for easy understanding.

  Transparent conductive materials that can be used as the first electrode 231 include, for example, indium tin oxide (ITO), zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, potassium-added zinc oxide, In addition to silicon-doped zinc oxide, metal oxides such as zinc oxide-tin oxide system, indium oxide-tin oxide system, zinc oxide-indium oxide-magnesium oxide system, and materials in which two or more of these metal oxides are combined is there.

The first electrode 231 can be formed by, for example, a photolithography method. Specifically, after a conductive film made of a transparent conductive material is formed on the surface of the first support layer 232, an electrode pattern made of a resist layer is formed on the conductive film by photolithography. Next, the first electrode 231 (first electrode pattern 231a) can be formed by etching the conductive film using the resist layer as a mask. The first electrode 231 and the extraction electrode 231b are formed in the same process.
Examples of the method for forming the transparent conductive material include dry processes such as sputtering, vacuum deposition, ion plating, and CVD. The thickness of the first electrode 231 is preferably in the range of 0.01 to 0.1 μm, for example.

  The 1st support body layer 232 is a base material for forming the 1st electrode 231, and the film or glass which has a light transmittance is used. Film materials that can be used for the first support layer 232 include, for example, polyethylene terephthalate (PET), cycloolefin polymer (COP), cyclic olefin copolymer (COC), polycarbonate (PC), triacetyl cellulose (TAC), poly And methyl methacrylate (PMMA). The thickness of the first support layer 232 is preferably in the range of 30 to 500 μm, for example. The 1st support body layer 232 is laminated | stacked on the back surface 22c of the light-guide plate 22 via the adhesion layer (not shown).

  The second electrode 233 is a transparent electrode that detects a change in voltage due to the capacitance at the position operated by the user, and is formed on the light output surface 22b side of the light guide plate 22, as shown in FIG. As shown in FIG. 4, in the second electrode 233, a rectangular second electrode pattern 233a is continuously arranged in the Y direction on a second support layer 234 (described later). In the second electrode 233, the second electrode patterns 233a continuous in the row direction (Y direction) are electrically connected to each other. In the second electrode 233, the second electrode patterns 233a adjacent in the column direction (X direction) are electrically insulated from each other.

FIG. 4 shows an example in which ten rows of second electrodes 233 including five second electrode patterns 233a are arranged. Note that the shape and size of the second electrode 233 are the same as those of the first electrode 231. The second electrode 233 is formed at a position that does not overlap the first electrode 231 in a planar manner. When configured as the light guide unit 21, the light guide plate 22, the transparent resin layer 25, and the like are interposed between the first electrode 231 and the second electrode 233, and thus the first electrode 231 and the second electrode 233. Are electrically insulated from each other.
The second electrode 233 includes a lead electrode 233b at one end (Y2 side) in the Y direction. The extraction electrode 233b is an electrode for extracting a change in voltage due to the capacitance at the position operated by the user as a signal. The extraction electrode 233b is connected to a control circuit (not shown) via an FPC or the like.

The transparent conductive material that can be used as the second electrode 233 is the same as that of the first electrode 231. Further, the second electrode 233 can be formed by, for example, a photolithography method, similarly to the first electrode 231. Note that the second electrode 233 and the extraction electrode 233b are formed in the same process.
The method for forming the transparent conductive material used as the second electrode 233 is the same as that of the first electrode 231. The thickness of the second electrode 233 is preferably in the range of 0.01 to 0.1 μm, for example, like the first electrode 231. In addition, the 2nd electrode 233 is laminated | stacked on the transparent resin layer 25 (The light emission surface 22b side of the light-guide plate 22) through the adhesion layer (not shown).

  The 2nd support body layer 234 is a base material for forming the 2nd electrode 233, and the film or glass which has a light transmittance is used. The film material that can be used for the second support layer 234 is the same as that of the first support layer 232. Moreover, it is preferable that the thickness of the 2nd support body layer 234 shall be in the range of 30-500 micrometers similarly to the 1st support body layer 232, for example.

When the touch panel 23 is laminated on the light guide plate 22, as shown in FIG. 5, the first electrodes 231 and the second electrodes 233 are alternately arranged at positions where they do not overlap each other in plan view. In the display input device 1, when the user touches (or approaches) the surface (protective layer 24) of the light guide plate 22 with his / her finger, a capacitance change occurs in the portion touched by the user. This change in capacitance is detected as a change in voltage of the first electrode 231 and the second electrode 233 corresponding to the part touched by the user. Therefore, the display input device 1 can detect the intersection of the matrix in which the voltage has changed as a position touched by the user's finger.
In the surface light source device 20 of the present embodiment, the touch panel 23 detects the portion touched by the user's finger in the same manner as a touch panel compatible with a general projection-type capacitance method. By integrating with 22, the function of the touch panel 23 is not impaired.

The configuration of the surface light source device 20 will be described with reference to FIG. 2 again.
The protective layer 24 is a layer for protecting the surface on the viewer side (Z2 side) of the first electrode 231. Materials that can be used as the protective layer 24 are acrylic resins, polycarbonate resins, cycloolefin resins, polyester resins, and the like. The thickness of the protective layer 24 is preferably in the range of 7 to 100 μm, for example. In addition, the protective layer 24 is laminated | stacked with the 1st electrode 231 through the adhesion layer (not shown).

  The transparent resin layer 25 is a layer that covers the unit optical shape 122 formed on the light output surface 22b of the light guide plate 22 and has the light output surface 22b side of the light guide plate 22 as a flat surface. By making the light exit surface 22b side a flat surface, the optical characteristics of the second electrode 233 (described later) can be further improved. Furthermore, by making the light exit surface 22b side a flat surface, the second electrode 233 formed thereon can be a uniform electrode layer free from steps and uneven thickness. The transparent resin layer 25 has a function as a refractive index adjustment layer. For example, by making the refractive index of the transparent resin layer 25 smaller than the refractive index of the light guide plate 22, the light guided through the light guide plate 22 can be totally reflected and guided in the light guide direction. it can. In addition, it is preferable that the refractive index difference of the light-guide plate 22 and the transparent resin layer 25 shall be the range of 0.03-0.10, for example. Examples of materials that can be used for the transparent resin layer 25 include polyethylene terephthalate (PET), acrylic resins, polycarbonate resins, cycloolefin resins, polyester resins, silicon resins, and fluorine resins. The thickness of the transparent resin layer 25 is preferably in the range of 1 to 25 μm, for example.

  The light source unit 26 is a part that emits light that illuminates the liquid crystal display panel 11. The light source unit 26 is disposed at a position facing the light incident surface 22 a that is one end surface (X1 side) in the X direction of the light guide plate 22. In the light source unit 26, a plurality of point light sources (not shown) are arranged at predetermined intervals along the Y direction. The light L2 projected from each point light source enters the light guide plate 22 from the light incident surface 22a. An element that can be used as a point light source is, for example, an LED (light emitting diode). The light source unit 26 may be a line light source such as a cold cathode ray tube, or may be disposed on one end surface of the light guide plate 22 in the Y direction. The light source unit 26 is connected to a power source unit (not shown), and turning on and off of the point light source is automatically switched manually or by a control circuit (not shown).

In the surface light source device 20 of the first embodiment described above, the light guide plate 22 and the touch panel 23 are configured as an integrated light guide unit 21. Therefore, the surface light source device 20 including the light guide unit 21 can reduce the overall thickness and weight. In addition, the surface light source device 20 including the light guide unit 21 is reduced in overall thickness, and a path through which incident light passes is shortened, so that high luminance can be realized. In addition, the surface light source device 20 including the light guide unit 21 can omit the process of joining the light guide plate 22 and the touch panel 23 with an adhesive film, and can partially omit a common configuration in the light guide plate 22 and the touch panel 23. Manufacturing costs and material costs can be reduced.
Therefore, according to the light guide unit 21, the surface light source device 20, and the display input device 1 of the first embodiment, the structure can be further simplified without impairing the function of the touch panel.

  In the light guide unit 21 of the first embodiment, the first electrode 231 and the second electrode 233 of the touch panel 23 are arranged separately in the Z direction with the light guide plate 22 interposed therebetween. Therefore, the overall thickness and weight of the light guide unit 21 can be reduced. Moreover, since the structure of the light guide unit 21 can be simplified, the man-hours and labor of the process of modularizing the light guide unit 21 can be further reduced.

(Second Embodiment)
Next, the display input device 1A of the second embodiment will be described.
FIG. 6 is a schematic cross-sectional view of the display input device 1A in the second embodiment. FIG. 7 is an exploded perspective view showing the configuration of the light guide unit 21A of the second embodiment.
The display input device 1 </ b> A of the second embodiment is different from the first embodiment in that the touch panel 23 </ b> A is stacked on the back surface 22 c side of the light guide plate 22. In the display input device 1A of the second embodiment, other configurations are substantially the same as those of the first embodiment. Therefore, in FIG. 6 and FIG. 7, only the surface light source device 20 </ b> A is illustrated, and the entire display input device 1 </ b> A including the reflective display unit 10 is omitted. Further, in the description of the second embodiment and the respective drawings, members and the like that are the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant descriptions are omitted.

As illustrated in FIG. 6, in the surface light source device 20 </ b> A of the second embodiment, the touch panel 23 </ b> A is stacked on the back surface 22 c side of the light guide plate 22. In the touch panel 23A of the second embodiment, the first electrode 231, the first support layer 232, the second electrode 233, and the second support layer 234 are sequentially stacked in the Z direction (Z2-Z1).
The first support layer 232 is laminated on the second electrode 233 via an adhesive layer (not shown). The 2nd support body layer 234 is laminated | stacked on the back surface 22c of the light-guide plate 22 via the adhesion layer (not shown). Since the first support layer 232 (and the adhesive layer) is interposed between the first electrode 231 and the second electrode 233, the first electrode 231 and the second electrode 233 are electrically insulated. ing.

  Also in the surface light source device 20A of the second embodiment, since the light guide plate 22 and the touch panel 23A are configured as an integrated light guide unit 21A, the same effects as those of the first embodiment can be obtained. That is, according to the light guide unit 21A, the surface light source device 20A, and the display input device 1A of the second embodiment, the structure can be further simplified without impairing the function of the touch panel.

In the surface light source device 20A of the second embodiment, since the touch panel 23A is stacked on the back surface 22c side of the light guide plate 22, it is possible to detect a change in capacitance that occurs in a portion touched by a user's finger with higher sensitivity. .
In the surface light source device 20A of the second embodiment, since the touch panel 23A is stacked on the back surface 22c side of the light guide plate 22, the configuration for connecting the extraction electrode and the FPC can be further simplified.

(Third embodiment)
Next, a display input device 1B according to a third embodiment will be described.
FIG. 8 is a schematic cross-sectional view of the display input device 1B in the third embodiment. FIG. 9 is an exploded perspective view showing the configuration of the light guide unit 21B of the third embodiment.
The display input device 1B of the third embodiment is different from the first embodiment in that the touch panel 23B is stacked on the light exit surface 22b side of the light guide plate 22. The other configuration of the display input device 1B of the third embodiment is substantially the same as that of the first embodiment. Therefore, in FIG. 8 and FIG. 9, only the surface light source device 20 </ b> B is illustrated, and the entire display input device 1 </ b> B including the reflective display unit 10 is omitted. Further, in the description of the third embodiment and the respective drawings, the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the duplicate description is omitted.

As shown in FIG. 8, in the surface light source device 20 </ b> B of the third embodiment, the touch panel 23 </ b> B is stacked on the light exit surface 22 b side of the light guide plate 22. In the touch panel 23B of the third embodiment, the first electrode 231, the first support layer 232, the second electrode 233, and the second support layer 234 are sequentially stacked in the Z direction (Z2-Z1).
The 1st electrode 231 is laminated | stacked on the transparent resin layer 25 (The light emission surface 22b side of the light-guide plate 22) through the adhesion layer (not shown). The first support layer 232 is laminated on the second electrode 233 via an adhesive layer (not shown). Since the first support layer 232 (and the adhesive layer) is interposed between the first electrode 231 and the second electrode 233, the first electrode 231 and the second electrode 233 are electrically insulated. ing.

  Also in the surface light source device 20B of the third embodiment, since the light guide plate 22 and the touch panel 23B are configured as an integrated light guide unit 21B, the same effects as those of the first embodiment can be obtained. That is, according to the light guide unit 21B, the surface light source device 20B, and the display input device 1B of the third embodiment, the structure can be further simplified without impairing the functions of the touch panel.

In the surface light source device 20B of the third embodiment, since the touch panel 23B is laminated on the light exit surface 22b side of the light guide plate 22, each electrode of the touch panel 23B can be more reliably protected.
In the surface light source device 20B of the third embodiment, since the touch panel 23B is laminated on the light output surface 22b side of the light guide plate 22, the configuration for connecting the extraction electrode and the FPC can be further simplified.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to each embodiment mentioned above, Various deformation | transformation and a change are possible like the deformation | transformation form mentioned later, These are also this book. It is within the technical scope of the invention. In addition, the effects described in each embodiment are merely a list of the most preferable effects resulting from the present invention, and are not limited to those described in each embodiment. Note that each of the above-described embodiments and modifications described later can be used in appropriate combination, but detailed description thereof will be omitted.

(Deformation)
In the light guide unit 21 of the first embodiment, the first electrode 231 may be directly laminated on the back surface 22 c of the light guide plate 22. According to this structure, since the 1st support body layer 232 can be abbreviate | omitted, the thickness of the light guide unit 21 can be made thinner. Further, according to this configuration, after the first electrode 231 is formed on the first support layer 232, the step of laminating the back surface 22c of the light guide plate 22 via the adhesive layer can be omitted, so that the manufacturing cost and material cost can be reduced. Can be reduced.

  In the light guide unit 21 of the first embodiment, the light guide plate 21 has a layer thickness between the light output surface 22b of the light guide plate 22 and the touch panel 23 (second electrode 233) such that the light output surface 22b side of the light guide plate 22 is a flat surface. An adhesive layer (not shown) may be formed. According to this configuration, since the transparent resin layer 25 can be omitted, the thickness of the light guide unit 21 can be further reduced. Moreover, according to this structure, since the process of laminating | stacking the transparent resin layer 25 on the light emission surface 22b of the light-guide plate 22 can be skipped, manufacturing cost and material cost can be reduced.

  In the light guide unit 21 of the first embodiment, when the unevenness (unit optical shape 122) on the light output surface 22b side of the light guide plate 22 is small, the second electrode 233 may be directly laminated on the light output surface 22b of the light guide plate 22. . According to this configuration, since the transparent resin layer 25 can be omitted, the thickness of the light guide unit 21 can be further reduced. Moreover, according to this structure, since the process of laminating | stacking the transparent resin layer 25 on the light emission surface 22b of the light-guide plate 22 can be skipped, manufacturing cost and material cost can be reduced.

  In the light guide unit 21 </ b> A of the second embodiment, the second electrode 233 may be directly laminated on the back surface 22 c of the light guide plate 22. According to this structure, since the 2nd support body layer 234 can be abbreviate | omitted, the thickness of the light guide unit 21 can be made thinner. Further, according to this configuration, after the second electrode 233 is formed on the second support layer 234, the step of laminating on the back surface 22c of the light guide plate 22 through the adhesive layer can be omitted. Can be reduced.

  In the light guide unit 21B of the third embodiment, when the unevenness (unit optical shape 122) on the light output surface 22b side of the light guide plate 22 is small, the first electrode 231 may be directly laminated on the light output surface 22b of the light guide plate 22. . According to this configuration, since the transparent resin layer 25 can be omitted, the thickness of the light guide unit 21B can be further reduced. Moreover, according to this structure, since the process of laminating | stacking the transparent resin layer 25 on the light emission surface 22b of the light-guide plate 22 can be skipped, manufacturing cost and material cost can be reduced.

  In each embodiment, the touch panel is not limited to the capacitive method, but may be a type corresponding to a resistive film method, an optical method, or the like. Depending on the detection method of the touch panel, the arrangement form of the touch panel (first to third embodiments) can be appropriately selected.

  In each embodiment, the shape of the first electrode pattern 231a and the second electrode pattern 233a is not limited to a quadrangle as shown in FIG. Further, the number of the first electrode patterns 231a and the second electrode patterns 233a is not limited to the example of the above embodiment, and can be selected as appropriate.

  In each embodiment, the distribution of the unit optical shapes 122 (the light guide plate 22) may be formed so as to be sparse on the light incident surface 22a side and to be denser away from the light incident surface 22a. The light L2 incident on the light guide plate 22 (light incident surface 22a) from the light source unit 26 gradually decreases in amount as it moves away from the light incident surface 22a. Therefore, by forming the distribution of the unit optical shapes 122 so as to be denser away from the light incident surface 22a, the amount of the emitted light L2 can be made more uniform in the surface of the light output surface 22b. .

  The shape of the unit optical shape 122 is not limited to a cylindrical shape, and may be a triangular prism shape, a quadrangular prism shape, or the like. Moreover, although each unit optical shape 122 was made into the same shape, it is not restricted to this, The magnitude | size and shape may change along a light guide direction (X direction). Further, the unit optical shapes 122 having different sizes and shapes may be arranged in combination.

  The display input device according to the present invention is not limited to an electronic paper and a smartphone, but an EL or a liquid crystal display including an operation unit in addition to a PDA (Personal Digital Assistant), a portable navigation device, a notebook computer, a portable game machine, and a portable audio. The present invention can also be applied to electronic devices. The display input device according to the present invention can be implemented in the form of an electronic dictionary, a calculator, an electronic notebook, a desk phone, a digital camera, a video camera, a general audio device, or the like.

1, 1A, 1B Display input device 10 Reflective display unit 20, 20A, 20B Surface light source device 21, 21A, 21B Light guide unit 22 Light guide plate 22a Light incident surface 22b Light output surface 22c Rear surface 23, 23A, 23B Touch panel 25 Transparent resin Layer 26 Light source unit 122 Unit optical shape 231 First electrode 233 Second electrode

Claims (8)

A light incident surface on which light is incident, a light exit surface that intersects with the light incident surface, and a back surface that faces the light exit surface, and guides light incident from the light incident surface in a light guide direction, A light guide plate that exits from the light exit surface;
An operation position detection unit in which an electrode for detecting an electrical change in a position operated by a user with respect to the light guide plate is stacked on at least one of the back surface and the light exit surface of the light guide plate;
A light guide unit comprising: The light guide unit according to claim 1,
The operation position detector
A first electrode that is stacked on the back side of the light guide plate and detects an electrical change in a position operated by a user;
A second electrode that is laminated on the light exit surface side of the light guide plate and detects an electrical change in a position operated by a user;
A light guide unit comprising: The light guide unit according to claim 1,
The operation position detector
A first electrode for detecting an electrical change in a position operated by a user;
A second electrode that is electrically insulated from the first electrode and detects an electrical change in a position operated by a user;
The first electrode and the second electrode are laminated on the back side of the light guide plate;
A light guide unit. The light guide unit according to claim 1,
The operation position detector
A first electrode for detecting an electrical change in a position operated by a user;
A second electrode that is electrically insulated from the first electrode and detects an electrical change in a position operated by a user;
The first electrode and the second electrode are laminated on the light exit surface side of the light guide plate;
A light guide unit. The light guide unit according to any one of claims 1 to 4, wherein
The light guide plate is
A plurality of light extraction shapes for emitting at least part of the light incident on the light incident surface at the light exit surface;
An optical resin layer covering a plurality of the light extraction shapes and having a flat surface on the light output surface side;
Providing
A light guide unit. The light guide unit according to claim 5,
The optical resin layer is a refractive index adjustment layer;
A light guide unit. The light guide unit according to any one of claims 1 to 6,
A light source unit provided at a position facing the light incident surface of the light guide plate and projecting light onto the light incident surface;
A surface light source device comprising: A surface light source device according to claim 7;
A reflective display unit disposed on the light exit surface side of the surface light source device;
A display input device comprising:

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