JPH086721A - Coordinate input device - Google Patents

Abstract

PURPOSE:To reduce the thickness, weight, and size of the coordinate input device which detect handwriting input when a symbol or figure is inputted by handwriting to an information equipment. CONSTITUTION:A display panel 10 has a display surface 10a. The visibility of the display surface 10a of this display panel 10 is improved with surface light source unit 11. When an input device 18 approaches a necessary position on the display surface 10a of the display panel 10, coordinate data showing the position are detected by a light guide coordinate detection part 12. The light guide coordinate detection part 12 and surface light source unit 11 are united together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device,
The handwriting input is detected when a symbol or a figure is input by hand into an information device.

In recent years, portable information terminals such as electronic notebooks and sub-notebooks have been on the market. Due to the widespread use of this portable information terminal, there is an increasing demand for weight reduction and downsizing of the portable information terminal. In order to satisfy this demand, it is necessary to make the coordinate input device incorporated in the portable information terminal thinner, lighter and smaller.

[0003]

2. Description of the Related Art A sectional view of a conventional coordinate input device is shown in FIG. This coordinate input device is composed of a liquid crystal panel 100, a surface light source unit 101, and a coordinate detection unit 102. A display pattern is formed on the liquid crystal panel 100 by orienting the liquid crystal on the display surface in a predetermined pattern.

The surface light source unit 101 is provided on the back side of the display surface of the liquid crystal panel 100 in order to improve the visibility of the liquid crystal panel 100, and includes a diffusion plate 103, a light guide plate 104, fluorescent tubes 105, 105, and a holder. 106,10
6 and the reflector 107.

When the fluorescent tubes 105, 105 emit light, the light is reflected by the holders 106, 106 on the side surface 1 of the light guide plate 104.
04a, 104b are condensed toward the side surface 104
Light enters the light guide plate 104 from a and 104b.

Light entering the light guide plate 104 is reflected by the light guide plate 1.
The light is guided to the diffusion plate 103 and directly enters the diffusion plate 103, and is reflected by the reflection plate 107 and enters the diffusion plate 103. The diffusion plate 103 diffuses the light incident from the light guide plate 104.
As a result, planar light with substantially uniform brightness is obtained on the entire surface of the diffusion plate 3, and the visibility of the liquid crystal panel 100 is improved.

The coordinate detecting unit 102 is of an electromagnetic induction type and has a loop antenna group to read handwritten characters or figures. When the pen 108 that generates an alternating magnetic field approaches a required position on the display surface of the liquid crystal panel 100, the coordinate detection unit 102 detects coordinate data that represents the position.

This coordinate data is sent to the liquid crystal panel 100. The liquid crystal panel 100 displays the position of the pen 108 by dots. As a result, handwritten characters and the like are displayed on the display surface of the liquid crystal panel 100.

[0009]

However, in the conventional coordinate input device, the coordinate detection unit 102 is provided on the back side of the surface light source unit 101.

Further, the surface light source unit 101 and the coordinate detection unit 102 are formed separately, and the surface light source unit 101
And the coordinate detection unit 102 was not shared and integrated.

This is because when the coordinate detection unit 102 is sandwiched in the surface light source unit 101, the coordinate detection unit 10
This is because the light efficiency inside the surface light source unit 101 is deteriorated by the group of two loop antennas.

Therefore, the conventional coordinate input device has not been made thin, lightweight and compact by sharing and integrating.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a coordinate input device which is thin, lightweight, and downsized.

[0014]

Means for Solving the Problems The above-mentioned problems are solved by the following constitutions of the present invention.

According to a first aspect of the present invention, a display panel having a display surface, a surface light source unit for improving visibility of the display surface of the display panel, and an input device approaching a required position of the display surface of the display panel are provided. And a coordinate detection unit for detecting coordinate data representing the position of the coordinate detection unit, wherein the coordinate detection unit is integrated with the surface light source unit. For example, the coordinate detection unit is configured by an electromagnetic induction system, the conductor of the antenna loop group that configures the electromagnetic induction system coordinate detection unit is configured by aluminum or a transparent conductor, and the display panel is configured by a liquid crystal display panel. .

Further, in the invention of claim 2, the coordinate detection unit and the surface light source unit are integrated with each other by sharing one component of the coordinate detection unit and one component of the surface light source unit. It is a coordinate input device. For example,
One component of the coordinate detection unit is an insulating pattern,
One component of the surface light source unit is a diffuse reflective pattern of the light guide plate, which is shared.

According to a third aspect of the present invention, there is provided a coordinate input device in which the coordinate detection unit is constructed by an electromagnetic induction system, and one component of the surface light source unit is weighted to control emitted light. For example, one component of the surface light source unit is a diffuse reflective pattern of the light guide plate, and the width of this pattern is weighted.

According to a fourth aspect of the present invention, there is provided a coordinate input device in which the weighting is constituted by a width of a diffuse-reflecting grid pattern corresponding to the electromagnetic induction type antenna loop group.

A fifth aspect of the present invention is a coordinate input device in which a light shielding material is formed in dots between the lattices of the lattice pattern.

[0020]

As described above, in the coordinate input device according to the first aspect of the present invention, since the coordinate detection unit is integrated with the surface light source unit, it is possible to reduce the thickness, weight and size of the unit. Further, since the coordinate detection unit is integrated with the surface light source unit, it is possible to contribute to the improvement of the performance of the coordinate input device by improving the performance of the integrated unit. That is, it is possible to contribute to the performance improvement of the coordinate input device without separately improving the performance of the coordinate detection unit and the performance of the surface light source unit.

In the coordinate input device according to the second aspect of the present invention, one constituent element of the coordinate detection unit and one constituent element of the surface light source unit are shared, so that thinning, light weight and miniaturization can be achieved by sharing. You can

The coordinate input device according to the third aspect of the invention is
The coordinate detection unit is configured by an electromagnetic induction method, and since the one component of the surface light source unit is configured by weighting to control the emitted light, the emitted light is not hindered by the antenna loop group of the electromagnetic induction method, Light efficiency does not deteriorate.

The coordinate input device of the invention of claim 4 is
The weighting is configured by the width of a grid pattern corresponding to the electromagnetic induction type antenna loop group. Therefore, the width of the pattern becomes wider as the distance from the light source of the surface light source unit increases.

According to the coordinate input device of the invention of claim 5,
Since the light shielding material is formed in a dot shape between the grids of the grid pattern, the grid pattern widths can be made equal.

[0025]

1 is a sectional view of a first embodiment of a coordinate input device according to the present invention.

This coordinate input device includes a liquid crystal panel 10 and
It is composed of an edge light type surface light source unit 11 incorporating a light guide / coordinate detection unit.

On the display surface 10a of the liquid crystal panel 10,
A display pattern is formed by orienting the liquid crystal in a predetermined pattern.

The surface light source unit 11 is a liquid crystal panel 1.
In order to improve the visibility of the display surface 10a of 0, it is provided on the back side of the display surface 10a of the liquid crystal panel 10. The surface light source unit 11 includes a diffusion plate 13, a light guide / coordinate detection unit 12, fluorescent tubes 15 and 15, holders 16 and 16, a reflection plate 17, and the like.

Each fluorescent tube 15 serving as a light source is a straight tube, and is held by holders 16 and 16 on the side surfaces 12a and 12b of the light guiding / coordinate detecting section 12, respectively.

On the inner surface of each holder 16, reflective films 16a, 16a for reflecting 100% of the light emitted by each fluorescent tube 15 are formed.

High-refractive-index light guide layers 19 are provided between the fluorescent tubes 15 and the holders 16, respectively. The refractive index of each high-refractive-index light guide layer 19 is the
It is selected as a material having a large value with respect to the refractive index of the glass constituting the. As a result, the light emitted from each fluorescent tube 15 is efficiently incident on the light guide / coordinate detection unit 12. The light guide / coordinate detection unit 12 includes a light guide plate body 12c, a diffuse reflection insulating pattern 12d, and an X coordinate conductive pattern 12.
e, short-circuit prevention insulating material 12f, and Y-coordinate conductive pattern 1
2g and insulating material 12h.

The light guide plate body 12c is made of acrylic resin. An insulating pattern 12d having a diffuse reflection property is formed on the bottom surface of the light guide body 12c.

A plan view of the insulating pattern 12d having the diffuse reflection property is shown in FIG. Diffuse reflective insulating pattern 12d
Is a lattice pattern, and the width of the pattern in the lateral direction closer to the fluorescent tube 15 is narrower.
It is formed so that the width of the pattern in the lateral direction becomes thick.
As a result, the pattern width of the diffuse reflective insulating pattern 12d is weighted, the amount of light reflected by the diffuse reflective insulating pattern 12d is adjusted, and a planar light source is efficiently manufactured. The width of the vertical pattern of the diffuse reflection insulating pattern 12d is constant, but the vertical pattern may be omitted.

The diffuse reflection insulating pattern 12d is
White paint is formed by screen printing. In addition,
As the diffuse reflection insulating pattern 12d, an acrylic resin containing a blue fluorescent dye (for example, BBOT) may be used and formed by silk screen printing to be transparent.

On the lower surface of the diffuse reflection insulating pattern 12d, the X-coordinate conductive pattern 12e, the short-circuit preventing insulating material 12f, the Y-coordinate conductive pattern 12g, and the insulating material 1 are provided.
2h are formed respectively.

As shown in FIG. 4, the X-coordinate conductive pattern 12e and the Y-coordinate conductive pattern 12g constitute an electromagnetic induction type antenna loop group. Note that the diffuse reflective insulating pattern 12d is indicated by a broken line.

X-coordinate conductive patterns 12e, 12e ...
Is an aluminum film or a transparent conductive film, and is formed along the vertical grid of the insulating pattern 12d having a diffuse reflection property. One end of each is connected to form a loop circuit.

The Y-coordinate conductive patterns 12g, 12
g is also an aluminum film or a transparent conductive film,
.. are formed along the lateral grid of the diffuse reflective insulating pattern 12d so as to be orthogonal to the X-coordinate conductive patterns 12e. One end of each is connected to form a loop circuit.

At the intersection of the X-coordinate conductive pattern 12e and the Y-coordinate conductive pattern 12g, the short-circuit preventing insulating material 12 is formed.
f is formed. This short-circuit preventing insulating material 12f is
It may be diffusely reflective.

One end of each X-coordinate conductive pattern 12e is connected to each diode 20. Each diode 20 is connected to each switch 21. Each switch 21
Is connected to the diode 22. The diode 22 is connected to the X coordinate determining circuit 23.

Similarly, the Y-coordinate conductive pattern 12g is also a part of the electromagnetic induction type antenna loop group, and is connected to each diode 24, each switch 25, diode 26, and Y-coordinate determining circuit 27.

Coordinate data is determined by the X coordinate determining circuit 23 and the Y coordinate determining circuit 27, and this coordinate data is sent to the liquid crystal panel 10 of FIG.

More specifically, when the pen 18 for generating the alternating magnetic field shown in FIG. 1 approaches a required position on the display surface 10a of the liquid crystal panel 10, the X-coordinate conductive pattern 1 corresponding to the position is obtained.
An induced electromotive force is generated between the loop of 2e and the Y-coordinate conductive pattern 12g.

The induced electromotive force is determined by the X coordinate determining circuit 23 and the Y coordinate determining circuit 27 as coordinate data representing its position. This coordinate data is sent to the liquid crystal panel 10.

The insulating material 12h shown in FIG. 2 prevents short-circuiting between the Y-coordinate conductive patterns 12g and the reflection plate 17 shown in FIG.

The reflection plate 17 is formed by forming a reflection layer of aluminum or the like on a resin plate. This reflector 17
Reflects the light guided to the light guide / coordinate detection unit 12 away from each fluorescent tube 15 and isotropically scatters it.

The diffusion plate 13 has a structure in which an inorganic substance having a diffusion effect such as silica, barium sulfate and titanium oxide is dispersed in polycarbonate, polyester resin or acrylic resin.

This diffuser plate 13 is used for the light guide / coordinate detection unit 12
The light incident on the diffuser 13 is further diffused, and planar light having substantially uniform brightness is emitted on the entire surface of the diffusion plate 13 to enhance the visibility of the liquid crystal panel 10. The diffusion plate 13 includes a prism plate (not shown).

Therefore, when the fluorescent tubes 15 and 15 emit light, the respective lights are guided by the holders 16 and 16 and the coordinate detecting section 1 is provided.
The light is focused toward the side surfaces 12a and 12b of the second side surface 1
The light is guided into the light guide / coordinate detection unit 12 from 2a and 12b.

The light incident on the light guide / coordinate detection unit 12 is
The light is guided to the light guide plate body 12c and directly enters the diffusion plate 13, and is reflected by the reflection plate 17 and enters the diffusion plate 13. The diffusion plate 13 diffuses the light incident from the light guide plate 14. As a result, planar light with substantially uniform brightness is obtained on the entire surface of the diffusion plate 13, and the visibility of the liquid crystal panel 10 is improved.

The light guiding / coordinate detecting section 12 is of an electromagnetic induction type, and the pen 18 for generating an alternating magnetic field is the liquid crystal panel 1.
When approaching the required position of the display surface 10a of 0, the XY coordinate data representing the position is detected. This XY coordinate data is sent to the liquid crystal panel 10. The liquid crystal panel 10 displays the position of the pen 18 by dots. Handwritten characters and the like are displayed on the display surface 10a of the liquid crystal panel 10.

Furthermore, in this coordinate input device, since the light guide / coordinate detection unit 12 is incorporated in the surface light source unit 11, the surface light source unit and the coordinate detection unit can be integrated.
Further, the insulating pattern 12d having the diffuse reflection property of the light guide / coordinate detection unit 12 is used for both the light guide plate of the surface light source unit and the coordinate detection unit. Therefore, one component of the surface light source unit and one component of the coordinate detection unit are shared.

Therefore, this coordinate input device can be made thin, lightweight and compact by sharing and integrating. Therefore, the performance of the coordinate input device can be improved.

The surface light source unit and the coordinate detection unit may be shared with other constituent elements of the surface light source unit.

In the above embodiment, the X-coordinate conductive pattern 12e and the Y-coordinate conductive pattern 12g are guided and guided.
The conductive pattern 1 for the X coordinate is formed on the coordinate detecting portion 12.
2e may be formed in one component of the coordinate input device, and the Y-coordinate conductive pattern 12g may be formed in another component of the coordinate input device.

More specifically, the X-coordinate conductive pattern 12e and the Y-coordinate conductive pattern 12g may be arranged on either one of the diffusion plate (or prism plate) 13 or the reflection plate 17 of the coordinate input device. Good. In addition, between the two or more diffuser plates (or prism plates) 13, the light guide plate body 12c and the diffuse reflective insulating pattern 12d, or the reflective plate 17, the XY coordinate conductive patterns 12e and 12g are provided.
May be provided.

Since the pitches of the X-coordinate conductive pattern 12e and the Y-coordinate conductive pattern 12g are weighted, the X-coordinate determining circuit 23 is used when the pitches are different from the conventional case.
And the software of the Y-coordinate determination circuit 27 can compensate.

Next, FIG. 5 shows the actual light guiding / coordinate detecting unit 1.
2 shows the structure of 2. This structure is upside down. An insulating pattern 12d having a diffuse reflection property is formed on the light guide plate body 12c. An X-coordinate conductive pattern 12e is formed on the diffusely reflective insulating pattern 12d. The X-coordinate conductive pattern 12e is covered with a short-circuit prevention insulating material 12f. A Y-coordinate conductive pattern 12g is formed on the short-circuit prevention insulating material 12f. The Y-coordinate conductive pattern 12g is covered with an insulating material 12h.

In the light guide / coordinate detection unit 12 shown in FIG. 5, the liquid crystal panel 10 is provided on the light guide plate main body 12c via the diffusion plate 13 as shown by the chain double-dashed line.

Next, FIG. 6 shows a modification of the light guide / coordinate detection unit 12. This modification is also upside down. In the light guide / coordinate detection unit 12A in this case, the X-coordinate conductive pattern 12e is directly formed on the light guide plate body 12c.

The X-coordinate conductive pattern 12e is covered with a diffuse reflective insulating pattern 12d. A Y-coordinate conductive pattern 12g is formed on the diffusely reflective insulating pattern 12d, and the Y-coordinate conductive pattern 12g is covered with an insulating material 12h.

The light guide / coordinate detection unit 12A performs weighting for obtaining a uniform planar light source by the pattern widths of the X coordinate conductive pattern 12e and the diffuse reflective insulating pattern 12d.

Further, this X-coordinate conductive pattern 12e
Is a transparent electrode for suppressing deterioration of optical characteristics. Further, the X-coordinate conductive pattern 12e is formed with a pattern width as thin as possible or is made of a metal having good reflectivity.

The insulating pattern 12d of the diffuse reflection property of the light guiding / coordinate detecting section 12A is the conductive pattern 1 for the X coordinate.
The short circuit between 2e and the Y-coordinate conductive pattern is prevented.

The light guide / coordinate detection unit 1 shown in FIG.
2A, as shown by the chain double-dashed line, on the light guide plate body 12c,
The liquid crystal panel 10 is provided via the diffusion plate 13.

Next, a second embodiment of the coordinate input device of the present invention will be described with reference to FIG. FIG. 7 is a sectional view showing this second embodiment.

The coordinate input device of the second embodiment comprises a liquid crystal panel 30 and a direct type surface light source unit 31 incorporating a lighting curtain / coordinate detection unit. The writing cart is for adjusting the light of the fluorescent tube 35.

The liquid crystal panel 30 is the same as the liquid crystal panel 10 of the first embodiment.

The surface light source unit 31 is provided on the back side of the display surface 30a of the liquid crystal panel 30. The surface light source unit 31 includes a diffusion plate 33, a lighting curtain / coordinate detection unit 32, a fluorescent tube 35 ..., A reflection plate 37, and the like.

Each fluorescent tube 35 serving as a light source is the same as the fluorescent tube 15 of the first embodiment, and a light guide plate 34 is provided so as to surround each fluorescent tube 35. This light guide plate 34 is
The material is the same as that of the light guide plate body 12c of the first embodiment.

On the upper surface of the light guide plate 34, the lighting curtain / coordinate detection unit 32 and the diffusion plate 33 are laminated.

This lighting curtain / coordinate detection unit 3
2 is a transparent film 32a, a light-shielding film 32b, a diffuse reflective insulating pattern 32c, an X-coordinate conductive pattern 32d, a short-circuit preventing insulating material 32e, and a Y-coordinate conductive pattern 32f.
Composed of and.

This lighting curtain / coordinate detection unit 3
2 is shown in FIG. FIG. 8A is a diagram of the transparent film 32a, the light shielding film 32b, and the insulating pattern 32c having a diffuse reflection property as seen from the fluorescent tube 35 of FIG.

FIG. 8B is a sectional view of the lighting curtain / coordinate detection unit 32. The light shielding film 32b is hatched.

The transparent film 32a is made of acrylic resin. The light shielding film 32b is formed by depositing a light shielding material such as aluminum in a dot shape on the transparent film 32a. The dots of the light-shielding film 32b have a large area above the fluorescent tube 35 in FIG. 7, a high density per unit area, and are weighted so that the area becomes smaller as the distance from the fluorescent tube 35 increases. In addition, you may weight by the number of dots.

The diffuse reflective insulating pattern 32c has a first
It is made of the same material as the diffuse reflection insulating pattern 12d of the embodiment, but has the same pattern width in the lateral direction of the grating.

An X coordinate conductive pattern 32d, a short-circuit preventing insulating material 32e, and a Y coordinate conductive pattern 32f are formed on the lower surface of the diffuse reflection insulating pattern 32c.

The X-coordinate conductive pattern 32d, the short-circuit preventing insulating material 32e, and the Y-coordinate conductive pattern 32f are the same as those in the first embodiment.

Since the lighting curtain / coordinate detection unit 32 is laminated on the light guide plate 34, insulation for preventing short circuits between the Y coordinate conductive patterns 32f and the light guide plate 34 is provided as in the first embodiment. No material is needed.

The lighting curtain / coordinate detection unit 32 shown in FIG. 8 has the liquid crystal panel 3 on the transparent film 32a via the diffusion plate 33 as shown by the chain double-dashed line.
0 is provided.

The reflecting plate 37 is formed by forming a reflecting layer of aluminum or the like on a resin plate. The reflection layer is formed in a weighted pattern such that the density per unit area is small below the fluorescent tube 35 and the density per unit area increases as the distance from the fluorescent tube 35 increases. Due to the reflection plate 37, the amount of reflected light increases as the distance from the fluorescent tube 35 increases.

The diffusion plate 33 is the same as that of FIG.
Light diffused by the lighting curtain / coordinate detection unit 32 is diffused by the diffuser plate 33, and is radiated from the entire surface of the diffuser plate 33 to the liquid crystal panel 30 with uniform brightness.

Therefore, when each fluorescent tube 35 emits light,
Each light is reflected by the reflection plate 37 and guided into the light guide plate 34,
The light enters the lighting curtain / coordinate detection unit 32,
The lighting curtain / coordinate detection unit 32 makes the light uniform, and the diffusion plate 33 diffuses the light. As a result, planar light with substantially uniform brightness is obtained on the entire surface of the diffusion plate 33, and the liquid crystal panel 3 is obtained.
The visibility of 0 is improved.

The lighting curtain / coordinate detection unit 32 is of the electromagnetic induction type, and the pen 1 that generates an alternating magnetic field is used.
When 8 approaches a required position on the display surface 30a of the liquid crystal panel 30, XY coordinate data representing the position is detected.

This XY coordinate data is sent to the liquid crystal panel 30. The liquid crystal panel 30 displays the position of the pen 18 by dots. Handwritten characters and the like are displayed on the display surface 30a of the liquid crystal panel 30.

Further, since the coordinate input device incorporates the lighting curtain / coordinate detection unit 32 into the surface light source unit 31, the surface light source unit and the coordinate detection unit are integrated.

The insulating pattern 32c of the diffusing reflection of the lighting curtain / coordinate detecting unit 32 is used for both the light guide plate of the surface light source unit and the coordinate detecting unit.
Therefore, one component of the surface light source unit and one component of the coordinate detection unit are shared.

Therefore, this coordinate input device can also be made thin, lightweight and compact by sharing and integrating.

The conductive pattern 32d for the X coordinate and the conductive pattern 32f for the Y coordinate are provided on the diffusion plate (or prism plate) 33 of the coordinate input device, the light guide plate main body 34, or
It may be arranged on any one of the reflection plates 37.

Further, the transparent film 32a and the light shielding film 3
2b, a diffusion plate (or prism plate) 33, a light guide plate 34,
Alternatively, the XY coordinate conductive patterns 32d and 32f may be provided between two or more reflectors 37.

The light-shielding film 32b of the lighting curtain / coordinate detector 32 is the light guide plate body 12c of the first embodiment.
You may vapor-deposit on the lower surface of.

[0092]

As described above, according to the invention of claim 1,
Since the coordinate detection unit is integrated with the surface light source unit,
Thinness, light weight, and size reduction can be achieved by integration, and the performance of the coordinate detection unit and the surface light source unit can be improved to contribute to the performance improvement of the coordinate input device. That is, it is possible to contribute to the performance improvement of the coordinate input device without separately improving the performance of the coordinate detection unit and the performance of the surface light source unit.

According to the second aspect of the present invention, since one component of the coordinate detection unit and one component of the surface light source unit are shared, it is possible to reduce the thickness, weight and size by sharing. You can

According to the third aspect of the present invention, the coordinate detection unit is constructed by an electromagnetic induction method, and one component of the surface light source unit is constructed by weighting for controlling emitted light. The induction type antenna loop group does not interfere with the emitted light and does not deteriorate the light efficiency.

Further, according to the invention of claim 4, since the weighting is constituted by the width of the lattice pattern corresponding to the electromagnetic induction type antenna loop group, the width of the pattern becomes far from the light source of the surface light source unit. Can be expanded as

According to the fifth aspect of the invention, since the light shielding material is formed in dots between the lattices of the lattice pattern, the lattice pattern widths can be made equal. .

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a coordinate input device according to the present invention.

FIG. 2 is a cross-sectional view of a light guide / coordinate detection unit in FIG.

3 is a plan view of the diffuse reflective insulating pattern of FIG. 2. FIG.

FIG. 4 is a diagram showing a configuration of a conductive pattern of FIG.

5 is a diagram showing an actual structure of the light guide / coordinate detection unit in FIG. 1 upside down.

FIG. 6 is a diagram showing a modification of the light guide / coordinate detection unit in FIG.

FIG. 7 is a sectional view of a second embodiment of the coordinate input device according to the present invention.

FIG. 8 is a diagram showing the lighting curtain / coordinate detection unit of FIG. 7;

FIG. 9 is a cross-sectional view of a conventional coordinate input device.

[Explanation of symbols]

 10 Liquid Crystal Panel 10a, Display Surface 11 Surface Light Source Unit 12 Light Guide / Coordinate Detector 12c Light Guide Plate Body 12d Diffuse Reflective Insulation Pattern 12e X Coordinate Conductive Pattern 12f Short-Circuit Insulation Material 12g Y Coordinate Conductive Pattern 12h Insulation Material 13 Diffusion Plate 15 Fluorescent Tube 16 Holder 17 Reflector 18 Pen 23 X Coordinate Determining Circuit 27 Y Coordinate Determining Circuit 30 Liquid Crystal Panel 30a, Display Surface 31 Surface Light Source Unit 32 Lighting Curtain / Coordinate Detector 32a Transparent Film 32b Light-shielding Film 32c Diffuse reflective insulating pattern 32d X-coordinate conductive pattern 32e Short-circuit preventing insulating material 32f Y-coordinate conductive pattern 33 Diffuser plate 34 Light guide plate 35 Fluorescent tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinpei Nagatani, 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Satoshi Sekido, 1015, Kamikodanaka, Nakahara-ku, Kawasaki, Kanagawa, Fujitsu Limited

Claims (5)

[Claims] 1. A display panel (10, 30) having a display surface (10a, 30a), and a display surface (10a, 30) of the display panel (10, 30).
The surface light source unit (11, 3) for improving the visibility of a).
1) and the display surface (10a, 30) of the display panel (10, 30).
When the input device (18) approaches the required position in (a), a coordinate detection unit (12) that detects coordinate data representing the position.
d-12h, 20-27, 32c-32f), and the coordinate detection unit (12d-12h, 20-27,
32c to 32f) is the surface light source unit (11, 31)
A coordinate input device characterized by being integrated with. 2. The coordinate detection unit (12d-12)
h, 20-27, 32c-32f) and the surface light source unit (11, 31) are integrated into a coordinate detection unit (12d-12h, 20-27, 32).
c-32f) as a component (12d, 32c) and the surface light source unit (11, 31) as a component (12, 1).
3, 17, 32, 33, 34, 37), and the coordinate input device according to claim 1. 3. The coordinate detection unit (12d-12)
h, 20-27, 32c-32f) by an electromagnetic induction system, and one component (1) of the surface light source unit (11, 31).
The coordinate input device according to claim 2, wherein the coordinate input device is configured by performing weighting for controlling emitted light to (2, 13, 17, 32, 33, 34, 37). 4. The diffuse reflection grating pattern (12d, 3) in which the weighting is made to correspond to the electromagnetic induction type antenna loop group (12f, 12g, 32d, 32f).
The coordinate input device according to claim 3, wherein the coordinate input device has a width of 2c). 5. The grid pattern (12d, 32)
The coordinate input device according to claim 4, wherein the light shielding material (32b) is formed in a dot shape between the lattices of c).