JPS60200417A - Touch sensor for display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an input device such as an input/output sensor, a touch sensor, etc., and a display/input device equipped with the input device.

[Prior art]

Conventionally, the evening sensor, which was placed above the display (e.g. liquid crystal, <panel), has a certain -
It was necessary to remove the GRVP on the foot, and the electrodes on the upper and lower substrates should not touch except when the foot was in use, but malfunctions were likely to occur.

〔the purpose〕 .

The present invention aims to eliminate such conventional drawbacks.

〔Example〕

The touch sensor (or display/input device with a touch sensor) of the present invention is a matrix or segment type touch sensor that functions as a display switch, and has a film substrate (one of the upper and lower substrates) and a glass substrate (one of the upper and lower substrates). The main feature is that a scallop is provided in the area other than the overlapped part of the transparent conductive film (pixel part) to prevent malfunction due to touch, and the spacer shown on the dashed line is provided around the periphery to bond the top and bottom substrate. shall be.

For example, as shown in Figure 1, an adhesive containing plastic balls (this is called a scallop) is printed on a glass substrate (lower substrate) using a screen printer or an octopus printer, and then heated at a certain temperature. dry.

2- In this case, the print shape is a small circular arc so as not to be visually noticeable, and a transparent silicon adhesive is used. The diameter is preferably 0.2 IIIφ or less, which is difficult to see visually.

The Ga7r of the upper and lower substrates must be kept at 30 to 50 μ so as not to tangle except when in use, and is included in all the spacer agents in the plastic balls to provide elasticity to the touch.

Next, the entire peripheral seal is printed on the entire film substrate side, and the upper and lower substrates are bonded to this area by thermocompression.

In this case, the shape of the seal is a broken line as shown in FIG. 2 (1). This is because if the seal is sealed as shown in (2) in Figure 2, when the upper and lower boards are thermocompression bonded, the air between them will expand and the seal will break, and the reliability test of the touch test This is because the moisture resistance is completely reduced (the resistance value of the transparent 7J film increases). The reason for this is thought to be that since the film of the upper substrate has moisture permeability, the resistance value of the transparent conductive film abnormally increases due to moisture absorption. Therefore, a seal shape that allows moisture to escape in the plane direction, as shown in FIG. 2 (1), is suitable. Is this 1lif? This was proven in the W test. Opening 1
50 degrees of darkness is appropriate.

Since the material of the peripheral spacer film itself does not have heat resistance (for example, when using a biaxially stretched polyester film), it is desirable to use an adhesive that hardens at the lowest possible temperature.

In order to make it difficult for the scallops to be bent, the -1-substrate and the scallops are not bonded together in the present invention. The film substrate is simply placed on top of a scallop with a certain gap attached to the glass. In order to prevent the upper and lower boards from shifting, the upper and lower boards are separated using a peripheral spacer and glued together outside (where they cannot be seen on the product), but when mounting the touch sensor on the display, the upper and lower boards It goes without saying that a peripheral spacer is not necessary if the upper substrate can be held down with a metal frame etc. to prevent the substrate from shifting. On the other hand, the position of the scallop is such that the electrodes of the upper and lower substrates overlap. part(
] It is desirable to provide as many locations as possible in places other than the pixel area (pixel element part) to the extent that it does not affect the appearance. (Providing scallops on the pixel area will reduce the appearance and brightness.) Malfunctions will naturally be reduced.

An embodiment of the present invention is shown in FIG. 3 below.

The touch sensor of the present invention is installed on top of the liquid crystal panel,
(In this case, the structure of the touch sensor may be film and film, or glass and film, or the upper substrate may be glass and the lower substrate may be film.) When pressed, the matrix, the -H arranged in a nox shape, and the transparent conductive film on the lower substrate come into contact and switch, applying voltage to the liquid crystal panel and displaying characters, figures, etc. This example is a liquid crystal panel.
Although the touch sensor is placed on the screen, it can be widely applied to general displays (eg, CRTs, etc.).

Furthermore, the lower member constituting the touch sensor may also be used as the upper member of the display. For example, the front glass of a CRT may be used as the lower member of the touch sensor. Further, the upper substrate, polarizer, UV filter, etc. of the liquid crystal display may also be used as the lower member of the touch sensor. Further, examples of display bodies include EOD:KL, plasma, and the like. It goes without saying that transparent or opaque electrodes that do not cause viewing problems are provided on the surface of the substrate facing the touch sensor.

〔effect〕

Since the touch sensor for a display according to the present invention has the configuration as described above, the reliability of manual key operation is very high and malfunctions are extremely rare.

[Brief explanation of drawings]

FIG. 1 shows the (6) surface structure of the touch sensor of the present invention. FIG. 2 shows a planar structure of the touch sensor of the present invention. FIG. 3 shows an embodiment in which the evening/Sochi sensor of the present invention is set with a liquid crystal panel. 1...Film 2...Glass 3...Scallop 4...Peripheral spacer -6- 5...Plastic ball 6... ...Transparent conductive film 7...Upper polarizing plate 8...Liquid crystal cell (glass) 9...Liquid crystal layer 10...Lower polarizing plate (with reflective plate) )11...
・Touch sensor → Ku- 12...Liquid crystal panel or above Applicant: Epson Corporation ・5, ], i', L7- Figure 1 (1) (2) Figure 2 Figure 3

Claims (1)

[Claims] Applying a seal to the space 1-1 printed on the glass substrate (lower substrate)-H and the surrounding area of the display sensor with a transparent conductive film substrate and a glass substrate facing each other. The sign is Sochi sensor.