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A technology of touch panel and touchpad, which is applied in the direction of identifying devices, instruments, computing, etc., and can solve the problems of reducing the brightness of the display and reducing the visibility

Inactive Publication Date: 2004-04-07
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As described above, conventional touch panel devices using a combination of a touch panel, a front light, and a reflective liquid crystal display have a problem in that reflected light caused by the touch panel and front light reduces the brightness of the display, thereby reducing visibility

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0039] image 3 and Figure 4 These are a sectional view and a plan view showing a touch panel device using ultrasonic waves according to a first embodiment of the present invention, respectively. exist image 3 and Figure 4 Among them, 1 represents the substrate made of glass, which is the substrate of the touch panel and the substrate of the front light source. The substrate 1 not only has the function of transmitting surface acoustic wave (SAW for short) to detect the touch position, but also has the function of transmitting light from the linear light source 2 and emitting it to the reflective liquid crystal display 3 .

[0040] For example, the configuration of the light source 2 is: a fluorescent lamp in the shape of a long cylinder, the main axis plane of which faces one end surface of the substrate 1 . The light source 2 and the substrate 1 are optically coupled to each other. Diffuse light from the light source 2 and incident into the substrate 1 travels through...

no. 2 example

[0048] Figure 6A is a cross-sectional view showing the configuration of a touch panel device using ultrasonic waves according to a second embodiment of the present invention. exist Figure 6A in, with image 3 The same components are denoted by the same reference numerals. In the second embodiment, a high optical refractive index portion 4 is provided at each of a plurality of positions on the back surface of the substrate 1 (the surface opposite to the touch position detection surface, or the face opposite to the liquid crystal display 3 ), It is made of an optically transparent resin having approximately the same optical refractive index as the substrate 1 made of glass. The high optical refractive index portion 4 can be formed by attaching a high optical refractive index resin material to the substrate 1 by printing.

[0049] In the second embodiment, since the high optical refractive index portion 4 is provided, the condition for total reflection of the light through ...

no. 3 example

[0053] Figure 7A is a cross-sectional view showing the configuration of a touch panel device using ultrasonic waves according to a third embodiment of the present invention. exist Figure 7A in, with image 3 The same components are denoted by the same reference numerals. In the third embodiment, at a plurality of positions on the back side of the substrate 1 made of glass (the surface opposite to the surface for detecting the touch position, or the face opposite to the liquid crystal display 3), opaque glass is provided with a predetermined inclination. Small slot 5. as corresponding to Figure 7A A partial enlarged view of the Mark 700 Figure 7B As shown, the groove 5 forms an angle with a direction of 35° to 55° with respect to the direction of the normal line of the back surface of the substrate 1 . The groove 5 is formed by patterning a resist film and then performing wet etching, or dry etching, such as RIE (Reactive Ion Etching: Reactive Ion Etching) or grinding...

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PUM

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Abstract

A substrate made of glass serves both as a substrate for a touch panel and as that for a front light, and has both functions of propagating an ultrasonic wave in order to detect a touched position, and propagating light emitted from a light source to guide the light toward a reflective-type liquid crystal display. In the case where an image on the liquid crystal display is made visible by external light, external light which has been transmitted through the substrate is reflected by the liquid crystal display, and the reflected light is again transmitted through the substrate to be emitted from the front face. In the case where the front light function is used, light which has been introduced into the substrate from the light source is reflected by the liquid crystal display, and the reflected light is transmitted through the substrate to be emitted from the front face.

Description

technical field [0001] The present invention relates to a touch panel device which can detect the position touched by an object such as a finger or a pen, especially a touch panel device integrated with a front light for a reflective liquid crystal display. Background technique [0002] With the popularity of computers, especially personal computers, touch panels have come into use. In a touch panel device, an area of ​​a liquid crystal display screen where a computer system displays data can be pointed by an object such as a finger or a pen, and thereby input new data or give various instructions to the computer system. [0003] Liquid crystal displays can be broadly classified into transmissive liquid crystal displays and reflective liquid crystal displays. Transmissive LCDs make images visible through light emitted from a light source (backlight) placed behind the LCD panel. The touch panel device of the transmissive liquid crystal display must use a backlight, thereby ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G06F3/041G09F9/00
CPCG06F3/041G06F3/0436G02B6/0053G02B6/0038G06F3/045
Inventor 中沢文彦有竹敬和
Owner FUJITSU LTD