JPH0736621A - Display and input unified device - Google Patents

Abstract

PURPOSE:To reduce the parallax in the display and input unified device provided with a tablet or a protective plate and a liquid crystal display device. CONSTITUTION:A fluid having a high refractive index is charged in a space 26 between a tablet 12 or a protective plate 22 and liquid crystal display devices 10 and 16. Thus, the optical refractive index from liquid crystal display devices 10 and 16 to the pointing face is increased without transmitting the pressing stress from a pen to liquid crystal display devices 10 and 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display / input integrated device which realizes a pen type interface. In particular, the present invention relates to a display device that employs a liquid crystal display device.

[0002]

2. Description of the Related Art A display / input integrated device is disclosed in Japanese Patent Publication No. 3-47533.
No. (G06F3 / 033) and is well known. FIG. 1 and FIG. 2 respectively show an example of a display / input integrated device. FIG. 1 is an overview of a device with an integrated display and input device.

In FIG. 1, (10) is a screen display device (display device) such as a liquid crystal display. (12)
Is a transparent coordinate input device (tablet). (14) is a pen for input. This display / input integrated device has a structure in which a transparent tablet (12) is stacked on a display device (10). By pointing an arbitrary position (P1) on the upper surface of this coordinate input device with a pen (14) or the like, the tablet (12) detects these two-dimensional coordinates and the corresponding position (P2) of the display device (10) Use it such as making it glow.

Incidentally, the input system of this integrated display / input device is generally a pressure-sensitive system or an electrostatic system. Figure
2 is an overview of the lower display-integrated input device. In FIG. 2, (16) is a screen display device such as a liquid crystal display. (18) is a coordinate input device (tablet). (20)
Is an input pen. (22) is a transparent protective plate.

Below the display device (16) is a tablet (1
8), and protect plate (22) on top of this display device (16)
It is a structure in which Any position on the upper surface of the protection plate (22) (P
If you pen 3) with a pen (20), etc., the tablet (18)
The two-dimensional coordinate (P5) is detected by and the position (P4) of the display device (16) corresponding to this position is illuminated.

Incidentally, the input system of this lower display-integrated type device is generally an electromagnetic system. By the way, as described in the above publication, such a display / input integrated device has a problem of so-called “parallax”. The parallax is a shift between the input coordinates and the display coordinates due to the mismatch between the screen display position and the coordinate pointing position.

Parallax will be briefly described with reference to FIG. This FIG. 3 is a cross-section of the upper display-integrated device. In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals. (2
4) represents the operator's viewpoint. (26) represents a gap between the display device (10) and the transparent tablet (12).

The display light of a certain point (P6) emitted from the display device (10) passes through the gap (26) and passes through the tablet (1
Pass 2) and reach the user's eye (24). On the other hand, when the user points the display point (P6), the same point is displayed at the position (P7) on the surface of the tablet. Therefore, when the position (P7) is pointed with the user's viewpoint as shown in FIG. 3, a parallax (D1) occurs between the actual display position (P6) and the pointing position (P7).

The same thing occurs in the case of the lower type. In consideration of such a situation, a method of disposing the parallax correction plate in the gap is disclosed in JP-A-4-114224 (G06F3 / 033).
Has been proposed by. As shown in FIG. 4, this is a parallax correction plate (28) in which rod lenses corresponding to the pixel size of the screen display device are arranged so as to correspond to each pixel.
By disposing the device between the tablet (12) and the display device (10), it is possible to prevent light scattering and maintain the two-dimensional image of the liquid crystal as it is in the height direction.

However, if this method is adopted, the apparatus becomes very expensive. Further, when viewed from an oblique direction, it is necessary to expect a change in the optical path due to optical diffusion on the surface of the rod lens array, and the amount of light drops.

[0011]

In order to reduce the parallax, the pen (14) (20) is, of course, placed on the upper surface of the display device.
The distance to the top surface of this device, which contacts with, should be reduced. For this reason, in the case of the top-up type, it is conceivable to arrange a transparent resin in the gap (26) to strengthen it, and to reduce the thickness of the gap (26) and the tablet. In addition to the above method, it is possible to eliminate the protective plate.

However, if a liquid crystal display device is adopted as the display device (10) (16), the above method cannot be used. As is understood by actually pressing the screen of a word processor or a personal computer having a liquid crystal display screen with a finger, in a general liquid crystal display device, the display screen is disturbed when it is distorted by pressure.

The screen of a general word processor or personal computer is never used in pressure contact. However, the display-integrated device originally had a pen (14,
It is a device that is pressed by 20). Depending on the display / input integrated device, the coordinate position can be detected without applying physical pressure. However, some users operate the pen with a large writing pressure.

Therefore, when the elastic resin is placed in the gap (26), the force from the pens (14, 20) is exerted. It is transmitted to the liquid crystal display through this elastic resin and the screen is disturbed. Also, if the protective plate is removed in the case of the bottom type, the liquid crystal display is slid by the pen (20) and the screen is disturbed. It is an object of the present application to reduce parallax that occurs in a display / input integrated device using this liquid crystal display.

[0015]

The present invention provides a liquid crystal display device.
It is characterized in that the gap provided between (10, 16) and the plate-like member (12, 22) with which the pen is brought into pressure contact is filled with a fluid having a high refractive index, a gel material, or a gas.

[0016]

In the present invention, due to the high refractive index material and the like,
Parallax becomes smaller. Further, since the material disposed in the gap is fluid or gel, the stress from the pen is not transmitted to the liquid crystal display device.

[0017]

EXAMPLE FIG. 4 shows an example of the present invention. FIG. 4 is a cross-section of a display / input integrated device. (30) is a transparent fluid or gel material filled in the gap (26). (32), (3
4) is a transparent plate material having a high refractive index, which is attached to increase the optical refractive index of the tablet.

As a basic structure, a liquid crystal display device
There is a gap (26) between the (10) and the tablet (12). Fluid (30)
Between the tablet (12) and the display device (10) (2
6) can be directly filled, but if it is difficult,
(14) is sealed in a transparent bag-shaped soft container and placed in the gap.

Light from a certain display pixel position (P8) of the display device (11) of FIG.
6), the plate material (34), the tablet (12), and the plate material (32), and the user's eyes (24) from the position (P9) on the upper surface of the integrated display / input device.
Reach Naturally, in this process, there is refraction of light and the optical path is bent. If the tablet (12) and the gap (26) have a high optical refractive index, the position of the upper surface of the optical path (P9) becomes
It is possible to approach 8) and reduce parallax.

FIG. 6 shows the difference between the optical paths of the prior art and the present invention. Figure 6
[FIG. 3] is a cross-sectional view of the basic structure of the display / input integrated device according to the present invention. When the gap (26) is a cavity between the position (P10) of a pixel on the screen display device and the user's eye (24), the optical path A (LA) is obtained. On the other hand, when the gap (26) is filled with the transparent fluid (30) having a high optical refractive index, the optical path B (LB) is formed.

At this time, the pointing position is the optical path A.
The position is the position (P11) in the case of and the position (P12) in the case of the optical path B, so the parallax is reduced by the distance from the position (P11) to the position (P12). Even if the tablet (12) is deformed by the pressure from the pen, the fluid or gel material (30) can be deformed along with it, so the deformation or stress of (12) is
Display device (1)
The display screen of 0) is not disturbed.

The transparent fluid filling the gap between the display device and the tablet is electrically and chemically inert when directly filling the gap. For example, it is ultrapure water or liquid CFC. For the purpose of reducing parallax,
The fluid is preferably a material having a high optical refractive index and a high transmittance. In addition, put the fluid in a soft transparent bag-shaped container,
If the space is filled, the fluid inside does not necessarily need to be electrically and chemically inert.

A transparent material such as glass or an acrylic material is usually used for the tablet, but a material having a higher optical refractive index has a smaller degree of parallax. Therefore, among the transparent materials such as glass and acrylic material, the coordinate input device is made of a material having the highest optical refractive index. still,
Although the above description has been made with reference to the upper input / input integrated device, the present application is naturally applicable to the lower input / input integrated device. When it is applied to the lower input / input integrated device, the tablet of the upper input / display integrated device corresponds to the protective plate of the lower input / input integrated device.

The high refractive index in this embodiment is effective if it is at least larger than air. Further, the present application may be carried out alone, or may be carried out in combination with the technique disclosed in Japanese Patent Publication No. 3-47533. Incidentally, in the present application, those having a high refractive index arranged in the gap are naturally in a gas, fluid or gel state even in the normal use. That is, it is different from the liquid resin for forming the reinforcing layer, which is cured after filling.

[0025]

According to the present invention, the parallax can be reduced in the liquid crystal display / input integrated type device without causing the image distortion due to the pressure of the pen.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a conventional top-mounted display / input integrated apparatus.

FIG. 2 is a diagram showing an example of a conventional bottom-mounted display / input integrated apparatus.

[Fig. 3] Fig. 3 is a diagram for describing parallax.

FIG. 4 is a diagram showing another conventional example.

FIG. 5 is a diagram showing an embodiment of the present invention.

FIG. 6 is a diagram showing an effect.

[Explanation of symbols]

(10,16) liquid crystal display device, (12,18) tablet, (14,24) pen, (22) protective plate, (12,22) transparent member disposed on the upper part of the liquid crystal display device with a gap, (24) user's eyes, (26) gap, (30) filling fluid, (LA) conventional light path, (LB) light path of the present application.

Claims (4)

[Claims] 1. A liquid crystal display device (10) and a transparent coordinate input device.
(12), which is a display input integrated type device which corresponds to coordinate input and screen display by superimposing the coordinate input device (12) on the liquid crystal display device (10), the coordinate input device (12) and A display / input integrated device, characterized in that a gap (26) with the liquid crystal display device (10) is filled with a fluid, a gel-like material, or a gas having a high refractive index. 2. When filling a gap between the coordinate input device (12) and the liquid crystal display device (10) with a fluid, the fluid is sealed in a transparent bag-shaped soft container to fill the gap. The integrated display / input device according to claim 1. 3. A liquid crystal display device (16), a coordinate input device (18), and a transparent protective plate (2) for protecting the liquid crystal display device (16).
2), and the coordinate input device under the liquid crystal display device (16)
Corresponding coordinate input and screen display by superimposing (18), in a display input integrated type device in which the protective plate (22) is superposed on the liquid crystal display device (16), the protective plate (22) and the A display / input integrated device, characterized in that a gap with the liquid crystal display device (16) is filled with a fluid, a gel material, or a gas having a high refractive index. 4. When filling a gap between the transparent protective plate and the screen display device with a fluid, the fluid is sealed in a transparent bag-shaped soft container and the gap is filled. Display input integrated device.