WO2007033600A1

WO2007033600A1 - An optical contact control screen

Info

Publication number: WO2007033600A1
Application number: PCT/CN2006/002482
Authority: WO
Inventors: Qiliang Chen
Original assignee: Chen, Meiying
Priority date: 2005-09-26
Filing date: 2006-09-21
Publication date: 2007-03-29
Also published as: CN1940840A; CN1940840B

Abstract

A conventional electronic ferule performs indication by virtue of the light spot emitted from the electronic ferule but can not operate the cursor of computer. Although the existing method can remotely control the cursor of computer but it is a relative location method the dimensional orientation of computer input device does not correspond to the position of cursor on the computer monitor each other. A optical conductor is added to the contact control screen or flat plane display with the contact control function in the invention the portion of the light guiding layer irradiated by light can generate conductivity electromagnetic coupling can be generated between the partial conducting surface and the contact control electrodes and shielding and reflecting effect can be generated to the transmission of the electromagnetic signal. By detecting influence on the transmission of the contact control signal the indication position of the light spot can be determined thereby to further make the cursor position of computer follow the indication position of the light spot.

Description

Optical touch screen

The invention relates to a touch screen and a flat panel display with touch function, in particular to an optical touch screen and a light touch flat panel display. Background technique

The traditional electronic pointer is based on the light spot. When the display content is complicated, the small light spot is not easy to be eye-catching. Most of it depends on the sway of the light spot to attract the reader's attention. In addition, the traditional electronic pointer cannot move by pointing the light spot. Move the computer cursor so that you cannot operate the computer directly. Application number is

The Chinese patents of 200510080825X, 2005100861285 and 2005201050729 propose a scheme for transmitting the electrodes of the flat panel display for transmitting and displaying the driving signal as well as for transmitting the touch signal, so that the flat panel display can directly feel the touch of the user's finger, and even feel Touch to the metal pointer, but when the user is away from the display, the touch signal cannot be transmitted to the display.

U.S. Patent (US Pat. No. 3, 983, 474, Kuipers, 1976) teaches sensing the spatial orientation change of a computer input device by using coils arranged orthogonally to one another, followed by US Pat. No. 5, 394, 029, Gay, et al. 1995) have proposed to move and control computer display elements in virtual reality by sensing the spatial orientation changes of the computer input device with mutually orthogonal Hall sensors. The Chinese patents No. 2004101042830 and 2004201189826 also propose to move the computer display elements by using a non-orthogonal magnetic field sensor in combination with a tilt sensor to sense the spatial orientation change of the computer input device. However, the method of determining the spatial orientation by sensing the earth's magnetic field is sometimes affected by the surrounding magnetic field or ferromagnetic material. U.S. Patent (US Pat. No. 5, 440, 326, Quinn, Gyration, Inc. 1995) has also proposed to sense the spatial orientation of a computer input device by a motor-driven gyroscope, but the gyroscope has high energy consumption and is complicated to manufacture. It is expensive and not a reasonable solution.

Swiss patent (CH669676, DE BRUYNE PIETER, ZELLWEGER USTER AG, 1986) It has been proposed to control the cursor by measuring the linear displacement of the spatial object with ultrasonic waves, but the sensitivity is different when moving the object toward the computer display screen in different orientations.

Chinese patents No. 2005100092729 and 2005200046232 propose to use ultrasonic or radio wave multi-point ranging to move and control the position of the cursor by changing the spatial orientation of the computer input device caused by the rotation and tilt of the operator's wrist and arm. The operation device corresponding to the left and right buttons on the mouse and the scroll wheel function on the computer input device controls the behavior of the computer cursor and the page, but the ranging wave also has problems affected by the obstacle and the reflector.

Although the above method can control the computer cursor at a long distance, it is a relative positioning method, that is, by measuring the relative movement of the spatial orientation of the computer input device to drive the movement of the computer cursor, the spatial orientation of the computer input device and the cursor on the computer monitor. Location, not one-to-one correspondence. Manipulating the cursor with relative positioning is not straightforward for the operator. Find a direct absolute positioning method to control the cursor, especially to locate the computer cursor at a long distance to indicate the light spot. It is very useful and necessary for interactive teaching, game operation, and even military simulation training. Summary of the invention

The present invention is directed to a touch screen capable of detecting a position of a light spot, and a flat panel display having a touch function capable of detecting a position of a light spot, and determining a touch position by determining a pointing position of the light spot.

The technical idea of the present invention is: adding a layer of photoconductor on the substrate of the touch screen or the flat panel display having the touch function, and when the light spot is irradiated, the portion of the photoconductive layer that is irradiated is electrically conductive, and the touch electrode feels The influence of the local conductive change of the photoconductor on the transmission of the touch signal determines the indication position of the light spot by detecting the influence of the touch signal transmission.

The technical solution of the present invention is: when a resistive touch method is used, a light guide layer is prepared between two touch electrodes, and when there is a light spot, the light guide layer is irradiated with local light guide characteristics to make two layers. The touch electrode is turned on, and instead of the conventional resistive touch screen, the contact between the two touch electrodes is turned on by pressure, and the light detecting point is detected by the touch detecting circuit connected to the touch electrode. Indeed The indicated position of the fixed point.

Another solution is: when using the capacitive touch method, a light guide layer is prepared on the insulating layer adjacent to the touch electrode, and when the light spot is irradiated, the light guide layer is locally irradiated to generate conductivity, and the light guide layer A coupling capacitance is generated between the local conductive surface and the touch electrode, and instead of the coupling capacitance generated between the finger of the conventional capacitive touch screen and the touch electrode, the touch detection circuit connected to the touch electrode is photocoupled. Capacitance detection determines the indicated position of the spot.

Another solution is: when the electromagnetic touch method is used, a light guide layer is prepared on the insulating layer adjacent to the touch electrode, and when the light spot is irradiated, the light guide layer is locally irradiated to generate conductivity, and the light guide layer The local conductive layer has a certain shielding effect on the electromagnetic signal, affecting the receiving of the electromagnetic signal by the touch electrode for detecting the electromagnetic signal, and the touch detecting circuit connected with the touch electrode is determined by detecting the photo-shielded touch electrode. The indicated position of the light spot.

Another solution is: when the electromagnetic touch method is used, a light guide layer is prepared on the insulating layer adjacent to the touch electrode, and when the light spot is irradiated, the light guide layer is locally irradiated to generate conductivity, and the light guide layer The local conductive layer has a certain reflection effect on the electromagnetic signal transmitted on the touch electrode, and the touch detection circuit connected to the touch electrode determines the indication position of the light spot by detecting the photoelectric signal of the light reflection.

The touch electrodes referred to in the above three schemes may be simple touch detection electrodes or electrodes shared by display driving and touch detection.

In this way, by adding a light guiding layer to the touch electrode, the touch screen or the flat panel display with the touch function can sense the illumination position of the light spot, and realize the optical touch screen. Users can use the light point to touch the touch screen or the flat panel display with touch function to move and manipulate the computer cursor. The optical touch positioning method also implements an absolute positioning method that makes the position of the pointing spot correspond to the position of the cursor on the computer monitor. Using the optical touch screen to sense the light and the effect of absolute positioning, when the spot can be irradiated onto a surface of the optical touch screen, or when the spot scans across a range of the surface of the optical touch screen, The optical touch screen enables image perception and transfer.

The photoconductive layer may be an inorganic photoconductive material or an organic photoconductive material. The light guiding layer of the optical touch screen may be located on the outer surface of the substrate, or on the inner surface of the substrate, or between the two touch electrodes.

The photoconductive layer can be prepared by a growth method, an evaporation method, a sputtering method, a gas phase or a liquid phase deposition method, a roll coating method, a spin coating method, a printing method, or the like.

In order to prevent the optical touch screen from being malfunctioned by the non-indicating light, the light guiding layer may adopt a light guiding material that reacts to some narrow-band light, or may encode the indicating light to detect the detected touch signal. Identify it.

The application range is not limited to the manipulation of the computer cursor, and its application range is not limited to the manipulation of the computer cursor. The light touch method can be used to move and control the cursor and non-cursor display elements on the computer display screen, or even the entire display screen; It can also be used for the control of other appliances such as TVs, digital TVs, game consoles, PDAs, mobile phones, etc. DRAWINGS

FIG. 1 is a schematic structural view of a capacitive optical touch liquid crystal display.

2 is a schematic structural view of an electromagnetic reflective type optical touch liquid crystal display.

3 is a schematic structural view of an optical touch liquid crystal display that shields electromagnetic signals of a row electrode. 4 is a schematic structural view of an optical touch liquid crystal display shielding an external electromagnetic signal.

FIG. 5 is a schematic structural view of a capacitive optical touch screen.

6 is a schematic structural view of a resistive optical touch screen. difficult

One embodiment of the present invention is shown in FIG. 1. A liquid crystal display 100 having an optical touch function determines an indication position of a light spot by a coupling capacitance generated between a photoconductive layer and a display electrode. The liquid crystal display 100 has an upper substrate 110, a lower substrate 120, an upper polarizer 130, a lower polarizer 140, a liquid crystal layer 150, liquid crystal alignment layers 151 and 152, and the like. The inner surface of the upper and lower substrates respectively have a row electrode 160 and a column electrode 170 for display driving and touch detection, and a light guide is coated on the outer surface of the upper substrate 110. The layer 180, the photoconductive material from which the photoconductive layer 180 is prepared, is photoconductively exposed by a portion of the external specific frequency of light. When the electrodes 160 and 170 are used for touch detection, the touch detection circuit connected to the touch electrode detects the capacitance on the electrodes 160 and 170. When a spot is irradiated onto the photoconductive layer 180, the photoconductive layer The portion irradiated by the spot produces electrical conductivity, and the photoconductive patch forms a coupling capacitance between the electrodes 160 and 170, so that the overall capacitance on the row and column electrodes of the corresponding position is increased, and the touch detection is compared with the capacitance of the row and column electrodes without the spot illumination. The circuit finds the position of the corresponding row and column electrodes illuminated by the spot, thereby obtaining the indicated position of the spot.

The second embodiment of the present invention is shown in FIG. 2: a liquid crystal display 200 having an optical touch function, which determines the indication position of the light spot by reflecting the electromagnetic signal of the display electrode through the light guiding layer. The liquid crystal display 200 has an upper substrate 210, a lower substrate 220, an upper polarizer 230, a lower polarizer 240, a liquid crystal layer 250, liquid crystal alignment layers 251 and 252, and the like. The row electrode 260 on the upper substrate is used for both the display driving and the transmitting touch signal. The column electrode 270 on the lower substrate is used for both the display driving and the detecting the electromagnetic touch signal, and is coated on the outer surface of the upper substrate 210. A layer of photoconductive layer 280, the photoconductive material from which the photoconductive layer 280 is prepared is photoconductive by a portion of the external specific frequency of light. The electrodes 260 and 270 transmit a radio frequency electromagnetic signal on the row electrode 260 during the period of the touch detection, and receive the electromagnetic signal emitted by the row electrode 260 by the column electrode 270. When a spot is irradiated onto the photoconductive layer 280, The portion of the photoconductive layer that is illuminated by the spot produces electrical conductivity. The conductive patch reflects the electromagnetic signal emitted from the row electrode at the corresponding position, and the column electrode corresponding to the position receives the electromagnetic signal reflected from the photoconductive patch. The touch detection circuit connected to the touch electrode detects the photoreflex electromagnetic signal. The pointed position of the spot is obtained from the position of the row and column electrodes corresponding to the spot irradiation portion.

The third embodiment of the present invention is shown in FIG. 3: a liquid crystal display 300 having an optical touch function, which determines the indication position of the light spot by shielding the electromagnetic signal of the row electrode through the light guiding layer. The liquid crystal display 300 has an upper substrate 310, a lower substrate 320, an upper polarizer 330, a lower polarizer 340, a liquid crystal layer 350, liquid crystal alignment layers 351 and 352, and the like. The row electrode 360 on the upper substrate is used for both the display driving and the transmitting touch signal. The column electrode 370 on the lower substrate is used for both the display driving and the detecting the electromagnetic touch signal on the insulating layer 390 of the row electrode 360. A light guide layer 380 is prepared to prepare a light guide of the light guide layer 380 The material is photoconductive by the portion of the external specific frequency of light. The electrodes 360 and 370 transmit a radio frequency electromagnetic signal on the row electrode 360 during the period of the touch detection, and receive the electromagnetic signal emitted by the row electrode 360 by the column electrode 370. When a spot is irradiated onto the photoconductive layer 380, The photoconductive layer is locally irradiated by the spot, and the conductive plaque exerts a certain shielding effect on the electromagnetic signal emitted from the row electrode at the corresponding position, affecting the reception of the electromagnetic signal by the column electrode at the corresponding position, and the touch The touch detection circuit connected to the electrode detects the electromagnetic signal on the photo-shielded touch electrode and compares with the electromagnetic signal received by the column electrode without the spot light to find the column corresponding to the spot irradiation position. The position of the electrode, thereby obtaining the indicated position of the spot.

The fourth embodiment of the present invention is shown in FIG. 4: a liquid crystal display 400 having an optical touch function, which determines the indication position of the light spot by shielding the external electromagnetic signal by the light guiding layer. The liquid crystal display 400 has an upper substrate 410, a lower substrate 420, an upper polarizer 430, a lower polarizer 440, a liquid crystal layer 450, liquid crystal alignment layers 451 and 452, and the like. The upper and lower substrates each have a row electrode 460 and a column electrode 470 for display driving and touch detection. A light guiding layer 480 is prepared on the inner surface of the upper substrate 410, and the photoconductive material of the photoconductive layer 480 is prepared by an external specific frequency. The portion irradiated with light produces photoconductivity, and the insulating layer 490 is further disposed between the photoconductive layer 480 and the row electrode 460. The electrodes 460 and 470 detect the externally-introduced electromagnetic signals by the row and column electrodes during the period of the touch detection. When the spot is irradiated onto the photoconductive layer 480, the photoconductive layer is locally irradiated by the spot to generate conductivity, and the conductive patches are conductive. A certain shielding effect is generated on the electromagnetic signal transmitted from the outside, affecting the reception of the electromagnetic signal by the row and column electrodes corresponding to the position, and the touch detection circuit connected to the touch electrode detects the electromagnetic on the photo-shielded touch electrode The signal is compared with the electromagnetic signal received by the row and column electrodes without spot illumination to find the position of the corresponding row and column electrodes illuminated by the spot, thereby obtaining the indicated position of the spot.

As shown in FIG. 5, a fifth embodiment of the present invention provides a capacitive optical touch screen 500 for determining an indication position of a light spot by a coupling capacitance generated between a light guiding layer and a touch electrode. The optical touch screen 500 is composed of a substrate glass 510, a photoconductive layer 520, insulating layers 530 and 540, row and column touch electrodes 550 and 560, and an optical antireflection layer 570. The photoconductive material of the photoconductive layer 520 is irradiated with light of a specific frequency externally. The portion produces photo-electricity, and the optical anti-reflection layer 570 is used to reduce the effect of the touch screen on the display effect. ring. When a spot is irradiated onto the photoconductive layer 520, the photoconductive layer is locally irradiated by the spot, and a coupling capacitance is generated between the photoconductive patch and the electrodes 550 and 560, so that the overall capacitance on the row and column electrodes of the corresponding position increases, and the contact The touch detection circuit connected to the control electrode detects the position of the corresponding row and column electrodes illuminated by the spot by detecting the capacitance of each row and column electrode, and compares the electrode capacitance with and without the spot illumination, thereby obtaining the indication position of the spot.

As shown in FIG. 6 , a sixth embodiment of the present invention is a resistive optical touch screen 600 that determines the position of the light spot by conducting conduction between the upper and lower touch electrodes through the light guiding layer. The optical touch screen 600 is composed of a substrate glass 610, a light guiding layer 620, upper and lower touch electrodes 630 and 640, and an optical anti-reflection layer 650. The photoconductive material of the photoconductive layer 620 is photo-conductive by a portion of the external specific frequency of light. The optical anti-reflection layer 650 is used to reduce the influence of the touch screen on the display effect. When a spot is irradiated onto the photoconductive layer 620, the photoconductive layer is electrically conductive by the spot irradiated by the spot, and the photoconductive patch causes the upper and lower touch electrodes 630 and 640 to be turned on at the illumination point, and the contact with the touch electrode is connected. The control detection circuit detects the position of the spot by detecting the conduction point of the upper and lower touch electrodes.

The above six embodiments do not represent all possible embodiments, and other modifications are also intended to be within the scope of the invention.

Claims

Rights request

The optical touch screen has two touch electrodes, and the touch electrodes are connected to the touch detection circuit. The touch detection circuit is configured to detect the touch points of the upper and lower touch electrodes to locate the touch points. The two layers of touch electrodes have a layer of light guiding layers which are respectively in contact with the two touch electrodes and are irradiated with light to generate electrical conductivity. The position of the light spots is determined by detecting the light conducting points.

2. The touch screen has a touch electrode, and the touch electrode is connected to the touch detection circuit. The touch detection circuit detects the touch point by detecting an electromagnetic coupling signal between the touch electrode and the touch point, and the feature is: The substrate has a light guiding layer separated from the touch electrode by an insulating layer and illuminated by light, and the position of the light spot is determined by detecting the photoelectromagnetic coupling signal between the light guiding layer and the touch electrode.

3. The optical touch screen of claim 2, wherein: the optical touch screen has more than one layer of mutually insulated touch electrodes.

The optical touch screen of claim 2, wherein the touch detection circuit detects a coupling capacitance signal generated between the local conductive surface of the light guiding layer and the touch electrode.

The optical touch screen of claim 2, wherein the touch detection circuit detects a change in the electromagnetic signal received by the touch electrode caused by the local conductive surface of the light guiding layer being illuminated by the light spot.

6. The optical touch screen of claim 2, wherein: the touch electrode of the optical touch screen is also a display driving electrode of the flat panel display.

7. The optical touch screen of claim 2, wherein: the light guiding layer of the optical touch screen is located on an inner surface of the substrate.

8. The optical touch screen of claim 2, wherein: the light guiding layer of the optical touch screen is located on an outer surface of the substrate.

The optical touch screen according to claim 1 or 2, wherein the detecting of the touch signal by the touch electrode of the optical touch screen is performed by an analog method.

10. The optical touch screen according to claim 1 or 2, wherein: the touch control of the touch control electrode of the optical touch screen is detected by a digital method.