CN1188774C - Flat panel display with touch controls - Google Patents

Abstract

A flat panel display screen with a touch control function, comprising a flat panel display screen body and a touch sensing layer, wherein the output of the touch sensing layer is connected to an identification circuit. The touch sensing layer is arranged behind the flat panel display screen. The electromagnetic induction antenna layer of the touch sensing layer is an electromagnetic induction antenna array with a "U"-shaped antenna cross-arranged structure distributed along the X and Y axes respectively, which can be an electromagnetic induction circuit formed by printing and etching a printed circuit board, or an electromagnetic induction circuit printed with silver paste or a mixture of silver paste and carbon paste. The electromagnetic induction circuit is a single-sided or double-sided printed circuit structure, or it can be a single-sided printed circuit stacked with more than one piece. An insulating shielding isolation layer is arranged behind the touch sensing layer, and an identification circuit layer is arranged after the insulating shielding isolation. The present invention has a simple manufacturing process, low cost, high precision, and long service life.

Description

Flat panel display with touch controls

technical field

The invention relates to a touch screen, in particular to a flat display screen with an electromagnetic induction touch control function. It belongs to the technical field of electronic appliances.

Background technique

With the wide popularization and application of computer technology, the electronic and digital channels of information are becoming more and more abundant. People use various peripherals of computers to invent various methods to complete the initial digitization process of information processing. For example: various keyboard input methods, voice input, image acquisition, etc., among which the most effective and convenient one is to directly input information and command by touching and clicking on the display screen. Such as, when utilizing computer drawing drawing, because utilize mouse operation can't really be as flexible as the operation that people use pen to draw on paper, and hinder people to complete exquisite pattern making skillfully all the time. Using a touch screen, using the touch control pen to directly operate on the display screen, the action is like painting on paper, so the whole work is very easy to complete and the effect is good. Moreover, with the continuous release of portable products, various peripherals such as keyboards and mice are omitted one by one. For example, PDA basically does not have the control of buttons, but all use the touch control pen to operate the touch screen to complete various operations.

Today's touch panels mainly use resistive methods. Its specific structure is that a transparent touch film is provided on the outside of the display screen, and a resistive layer is coated on the surface of the touch film. When the operation clicks on a specific position of the touch film, the subsequent identification control circuit can know the change of the potential of the position through calculation. , judge the location coordinates of the click, and perform corresponding operations. Due to the problems of high cost, complicated process, and unsuitable for handwriting input in the precision of the existing resistive touch panel when realizing a large-size touch panel, as well as physical damage such as wear and tear due to repeated external operations, the service life of the touch film is relatively long. Problems such as short, greatly limit the application of the touch screen.

Contents of the invention

The object of the present invention is to overcome various disadvantages of the above technologies, and provide a flat panel display with touch control function, which has simple manufacturing process, low cost, high precision and long service life.

The purpose of the present invention is achieved through the following technical solutions:

A flat panel display with a touch control function, which includes a display body and a touch sensing layer, the output of the touch sensing layer is connected to the input of a recognition circuit, and the touch sensing layer is arranged behind the flat panel display.

The touch sensing layer is an electromagnetic induction antenna layer formed by an antenna array composed of an electromagnetic induction line printed with silver paste or a mixture of silver paste and carbon paste.

The electromagnetic induction circuit is a single-sided or double-sided printed circuit.

The electromagnetic induction circuit can also be formed by stacking more than one printed circuit on one side.

An insulating shielding isolation layer is arranged behind the touch sensing layer, an identification circuit layer is arranged behind the insulating shielding isolation layer, and an identification circuit connected to the output of the touch sensing layer is arranged on it.

In order to further ensure the shielding effect, a space gap is provided between the insulating shielding isolation layer and the identification circuit layer.

The area of the touch sensing layer and the size of the display body can be adjusted accordingly according to different input requirements. For example: under normal circumstances, the area of the touch sensing layer should be equal to the area of the display body; when a part of the display needs to be used as a touch input or touch operation area, the area of the touch sensing layer should be smaller than the area of the display body; of course The area of the touch sensing layer can also be larger than the area of the display body, so that the entire display and the periphery of the display also have the capability of touch input because of the touch sensing layer.

When the area of the touch sensing layer is smaller than the area of the display body, its setting position may correspond to one side or two opposite sides or four sides of the back of the flat panel display.

The electromagnetic induction antenna array constituting the touch sensing layer is composed of "u" shaped electromagnetic induction lines cross-arranged.

The display is a plasma display or a liquid crystal display. A protective layer or film is also provided on the front of the display.

According to the foregoing technical scheme, the present invention has the following advantages:

1. Since the electromagnetic induction layer is arranged behind the display screen, it is easy to manufacture and low in cost, and the larger the area, the more prominent the cost advantage compared with the prior art.

2. Since the electromagnetic induction array antenna is used as the identification sensing device, its identification accuracy is high, and it can accurately input mouse information or handwriting information through pen or hand touch.

3. The signal is generated through the electromagnetic induction layer located behind the display screen. As a touch screen, the surface of the display screen is provided with a protective film, which is not easy to cause physical damage and has a long service life.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of another embodiment of the present invention;

Fig. 3 is the structural representation of identification circuit of the present invention;

Fig. 4 is a schematic diagram of the structure of the electromagnetic induction layer of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , the present invention is a flat display screen with touch control function, which includes a flat display screen body and a touch sensing layer. The output of the touch sensing layer is connected to an identification circuit. Any one of the existing writing board identification circuits can be used for the identification circuit, so the present invention will not repeat the identification circuit here. The display screen is a flat panel display screen such as a plasma display screen or a liquid crystal display screen.

The flat panel display body includes a front case 1 , a back case 7 and a display screen 3 . The feature of the present invention is that the touch sensing layer 4 is arranged behind the display screen 3, and after the electromagnetic handwriting control pen touches the display screen 3, the touch sensing layer 4 can still sense the position touched by the handwriting pad through the display screen.

In specific structural design, the area of the touch sensing layer 4 is the same size as the area of the display screen 3 . An insulating shielding isolation layer 5 is provided behind the touch sensing layer 4 , and an identification circuit layer 6 is provided behind the insulating shielding isolation layer 5 . The insulating and shielding isolation layer 5 is insulated and shielded from the touch sensing layer 4 and the identification circuit layer 6 respectively. Of course, the insulation shielding isolation layer 5 and the identification circuit layer 6 can be additionally arranged in the display screen or other spaces of the host. The insulating and shielding isolation layer 55 , the identification circuit layer 6 and the touch sensing layer 4 are bonded together so that the whole device can be sensed intensively. In order to further ensure the shielding effect, a space gap is provided between the insulating shielding isolation layer 5 and the identification circuit layer 6 . Of course, if there is a gap between the shielding layer 5 and the touch sensing layer 6 , the insulating effect is already achieved, and the body of the shielding layer 5 may not have an insulating layer.

Have again, in order to improve the ability such as the anti-abrasion of display screen 3 surface, be provided with transparent protective layer or protective film 2 on the front of display screen 3.

As shown in Figure 2, according to different needs, for example, when the display screen 3 is partially used as a touch input or touch operation area, the area of the touch sensing layer 4 can be smaller than the area of the display screen 3, and it is arranged on the side behind the display screen 3 , can also be arranged on both sides or around the display screen 3. Of course, the area of the touch sensing layer 4 can also be larger than the area of the display screen 3 , so that the entire display screen 3 and the periphery of the display screen 3 can have touch capability.

The touch sensing layer 4 of the present invention is an electromagnetic induction antenna layer, and the display screen isolates the control pen and the sensing layer without affecting the generation and transmission of sensing signals. Just as the insulating protective film of the tablet separates the stylus from the sensing layer, the working mechanism is the same as the signal generation of the tablet. In use, the electromagnetic signal source of the induction is the electromagnetic control pen. The electromagnetic handwriting control pen continuously emits fixed frequency or data electromagnetic signals when the pen tip is pressed. The electromagnetic signal is sensed by the horizontal antenna on the bottom layer and the vertical antenna on the top layer nearby, and transmitted to the CPU through the identification circuit interface. The CPU calculates and compares the position, voltage intensity, and frequency signal changes of the sensing antenna, and determines the position and various working states of the electromagnetic signal source. Then transfer the result to the PC, so as to control the PC to complete various action instructions. Such as text or shape recognition, drawing and shortcut key calling, etc.

Specifically, as shown in FIG. 4 , the electromagnetic induction antenna layer is an electromagnetic induction antenna array distributed along the X and Y axes respectively, with U"-shaped antennas and antennas cross-arranged.

The electromagnetic induction antenna array of the electromagnetic induction antenna layer 4 is an electromagnetic induction circuit formed by printing and corroding a printed circuit board. In order to reduce costs, the electromagnetic induction antenna array is an electromagnetic induction circuit printed with silver paste or a mixture of silver paste and carbon paste.

The electromagnetic induction circuit is a single-sided or double-sided printed circuit structure, and can also be stacked with more than one single-sided printed circuit.

The present invention can be widely applied to various touch control devices. Simultaneously, the idea of the present invention is not limited to the combination of the electromagnetic induction layer and the display screen of the flat panel. The rear parts of non-CRT display screens such as plasma display screens and liquid crystal display screens with various shapes that are not flat can be combined with the electromagnetic induction layer. Therefore, a low-cost touch screen structure is realized.

Claims (14)

1, a kind of flat-panel monitor with touch control function, it comprises monitor body and touch-control sensing layer, the output of touch-control sensing layer links to each other with the input of identification circuit, it is characterized in that: described touch-control sensing layer is arranged on the back of monitor body, this touch-control sensing layer is served as reasons, and silver is starched or the formed electromagnetic induction antenna stack of aerial array of the electromagnetic induction circuit formation of silver slurry and the printing of carbon pulp mixture, and described electromagnetic induction circuit is the single or double printed wire.

2, the flat-panel monitor with touch control function according to claim 1 is characterized in that: stacked the forming of printed wire that described electromagnetic induction circuit is the above single face of a slice.

3, the flat-panel monitor with touch control function according to claim 1, it is characterized in that: the back of described touch-control sensing layer is provided with the insulation shielding separation layer, be provided with the identification circuit layer behind the insulation shielding separation layer, which is provided with the identification circuit that links to each other with the output of touch-control sensing layer.

4, the flat-panel monitor with touch control function according to claim 3 is characterized in that: be provided with the spatial joint clearance that is used for further guaranteeing shield effectiveness between described insulation shielding separation layer and the identification circuit layer.

5, the flat-panel monitor with touch control function according to claim 1 is characterized in that: the area of described touch-control sensing layer equates with the area of monitor body.

6, the flat-panel monitor with touch control function according to claim 1, it is characterized in that: the area of described touch-control sensing layer is less than the area of monitor body.

7, the flat-panel monitor with touch control function according to claim 6 is characterized in that: described touch-control sensing layer the position is set, a side at the corresponding back side at monitor body.

8, the flat-panel monitor with touch control function according to claim 6 is characterized in that: described touch-control sensing layer the position is set, the dual-side at the corresponding back side at monitor body.

9, the flat-panel monitor with touch control function according to claim 6 is characterized in that: described touch-control sensing layer the position is set, the surrounding at the corresponding back side at monitor body.

10, the flat-panel monitor with touch control function according to claim 1, it is characterized in that: the area of described touch-control sensing layer is greater than the area of monitor body.

11, the flat-panel monitor with touch control function according to claim 1 is characterized in that: described electromagnetic induction aerial array is made of the layout of " u " shape electromagnetic induction circuit intersection.

12, according to claim 1 or 5 or 6 or 7 or 8 or 9 or 10 described flat-panel monitors with touch control function, it is characterized in that: described monitor body is plasma display or LCD.

13, according to claim 1 or 5 or 6 or 7 or 8 or 9 or 10 described flat-panel monitors with touch control function, it is characterized in that: the front of described monitor body is provided with protective layer.

14, the flat-panel monitor with touch control function according to claim 12, it is characterized in that: the front of described monitor body is provided with protective layer.

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