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Condenser type touch screen and preparation method thereof

A capacitive touch screen, touch screen technology, applied in the direction of electrical digital data processing, instruments, data processing input/output process, etc., can solve the problems of touch screen failure, signal influence, induction block conduction, etc., to reduce electromagnetic interference, improve Transmittance, the effect of avoiding Newton's ring

Inactive Publication Date: 2008-03-12
TRULY SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the touch screen of this double-layer substrate structure shown in Figure 4, there is no filler between the upper and lower substrates 11, 12, it is empty, that is, it is mainly air, so it is difficult to control the distance between the two layers of substrates. In the case of uneven spacing between the two substrates, referring to Figure 7, the upper substrate 11 bends downward, resulting in the appearance of Newton rings, and what is more serious is that the upper and lower substrates will touch together, which may cause rows and columns The sensing block is turned on, causing the touch screen to fail
[0008] In addition, the existing capacitive touch screens are generally directly attached to the display device without adding a conductive shielding layer in the middle. Referring to FIG. display device 9
Referring to Fig. 6, the capacitive touch screen B of the double-layer substrate structure is also directly added to the display device 9 through the frame glue 8 or other fixed parts, and the surface of the general display device has certain electromagnetic interference, which will affect the capacitive touch screen attached to it. The signal collected by the touch screen leads to inaccurate positioning of the touch screen

Method used

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  • Condenser type touch screen and preparation method thereof
  • Condenser type touch screen and preparation method thereof

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Effect test

Embodiment 1

[0038] Embodiment 1 of the present invention is shown in Figures 10 to 12. A capacitive touch screen B1 with a double-layer substrate structure includes an upper substrate 11, a lower substrate 12 and a sensing block. The insulating liquid 13 used to control the distance between the two substrates is filled in the gap, which overcomes the uneven distance between the two substrates, thereby effectively avoiding the appearance of Newton's rings. The insulating liquid 13 is liquid crystal, and the capacitive touch screen B1 adopts glass The material of the substrate and the sensing block is indium oxide-tin (ITO). Since the refractive index of glass is about 1.52, the refractive index of indium oxide-tin (ITO) conductive film is about 1.8, the refractive index of liquid crystal is about 1.5, and the refractive index of air is 1, between liquid crystal and glass and indium oxide- On the interface of the tin (ITO) conductive film, the difference in refractive index between the two ...

Embodiment 2

[0049] Embodiment 2 of the present invention is shown in Figure 13, differs from the previous embodiment in that the capacitive touch screen B2 of the double-layer substrate structure is also provided with spacers 16 between the upper substrate 11 and the lower substrate 12, thereby To further ensure that the distance between the two substrates is uniform, the dots 16 can be sprayed with powder or printed by silk screen.

Embodiment 3

[0051] Embodiment 3 of the present invention is shown in Figure 14, differs from Embodiment 1 in that an insulating liquid 13 is poured between the upper and lower substrates of the capacitive touch screen B3 with a double-layer substrate structure, and the dielectric constant of the insulating liquid 13 is greater than 1. Due to the different dielectric constants of different insulating liquids, the sensitivity of the touch screen may also be different. Therefore, in order to achieve the purpose of adjusting the sensitivity of the touch screen, it can be realized by selecting insulating liquids with different dielectric constants. Generally, the dielectric constant of the selected insulating liquid is greater than 1.

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Abstract

A capacitance touch-sensitive screen comprises an upper substrate, a lower substrate and an inductive module, which is characterized in that a clearance between the upper substrate and the lower substrate is filled with insulating liquid to control distance between these two substrates, thus eliminating uneven distance between these two substrates, avoiding ineffective touch-sensitive screens and prolonging service life of the touch-sensitive screen. As for production method of the capacitance touch-sensitive screen, it is necessary to firstly produce a row inductive module on the upper substrate and a column inductive module on the lower substrate and then glue two substrates with glues through side frames and reserve an opening. The opening is filled with insulating liquid through vacuumizing and liquid filling and finally sealed with sealing compounds.

Description

technical field [0001] The invention relates to a touch screen, in particular to a capacitive touch screen. The invention also relates to a manufacturing method of the capacitive touch screen. Background technique [0002] At present, as an input device, a touch screen allows users to directly input information by touching or handwriting on the surface of a display device with a touch screen. It is more friendly and convenient than mouse, keyboard and other input devices, so it is more and more widely used. On various portable devices such as mobile phones, PDAs, etc. There are many types of existing touch screen technologies. According to the type of contact used and the method of confirming the position of the contact point, the touch screen can be divided into resistive, capacitive, infrared, and surface acoustic wave. With the maturity of capacitive touch screen control IC technology, the decline in cost, and some unique advantages over other technologies, such as good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G06F3/044
CPCG06F3/044G06F3/0445
Inventor 何基强江华鸿
Owner TRULY SEMICON
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