KR20080089115A - Touch-screen using cmos-array - Google Patents

Abstract

A touch screen using a CMOS array is provided to check plural pushed positions simply by using the CMOS array while not being influenced by external disturbance light. A touch screen includes a frame(100), reflecting plates(200) and a CMOS array(300). The frame is formed in a rectangular shape at a circumference of a screen(500) for fixing the CMOS array and the reflecting plates. The CMOS array is black & white cameras made of 1 or 2 arrays and can sense an image moving on the screen by using the reflecting plates. Each photo diode formed in the CMOS array intercepts the light radially incident on the screen by using the reflecting plates. A case(510) which is formed at an upper end of the frame and whose front face is closed has light reception holes at the corners of the frame, namely where the reflecting plates are positioned. The reflection plates have curved faces and a center reflecting face is 2-3 mm wide. Each light source can be installed at the position of each reflecting plate for enhancing a contrast ratio of the CMOS array receiving the light at a diagonal position. The effect of an external disturbance light can be reduced by minimizing a light receiving height via a distance between the reflecting plates and the CMOS array.

Description

Touch screen using SiOS array {TOUCH-SCREEN USING CMOS-ARRAY}

1 is a plan view of a touch screen using a CMOS array formed in a preferred embodiment of the present invention.

Figure 2 is a perspective view showing a receiving window of the touch screen using a CMOS array formed in a preferred embodiment of the present invention.

Figure 3 is a perspective view showing a reflecting plate of the touch screen using a CMOS array formed in a preferred embodiment of the present invention.

Figure 4 is a conceptual diagram for explaining the operation of the touch screen using a CMOS array formed in a preferred embodiment of the present invention.

5 is a conceptual diagram of a camera using a conventional CMOS array.

** <Description of the symbols for the main parts of the drawings> **

100: frame 200: reflector

300: CMOS array 500: image plane

510: Case

The present invention relates to a touch screen using a CMOS array, and more particularly, to form a CMOS array in the corner of the frame, and to increase the light receiving rate by using a reflector to enable the CMOS array to sense the pressed position using the contrast ratio. It relates to a touch screen.

In general, a touch screen is a type of input device that receives an input by directly contacting a finger or an indicator rod with an image surface formed on a monitor or a screen.

Conventional touch screen forms a resistive film inside the transparent plate, a resistive film method for recognizing the pressed position by recognizing the change in resistance that changes due to the pressure generated at the pressed position, and using an infrared transmitting and receiving device There is an infrared method that recognizes the infrared position on the surface.

However, since the resistive film method is difficult to apply to a large image plane and the resistive film is easily damaged, there is a problem that the resistive film method cannot be applied to an image plane that uses a constant position continuously. Because of filling the leading edge, not only the price is high, but also there are problems such as a dead zone or an error caused by disturbance light.

Therefore, there is an urgent need for a new type of touch screen that can reduce the number of sensors, is not affected by disturbance light, and can be applied well to a large image surface.

In order to meet the above needs, the present invention was developed for the following purposes.

(1) It provides a touch screen that can easily identify the pressed position by using CMOS array.

(2) It provides simple touch screen and high precision touch screen for positioning.

(3) Provide a touch screen that is hardly affected by disturbance light.

(4) Provides a touch screen capable of multi-touch because a plurality of pushed positions can be recognized.

In order to achieve the above object, the present invention is characterized in that each of the corners of the rectangular frame is formed with a reflector, each CMOS array is fixed to the frame to be spaced apart from the respective reflector.

In general, a Charge Coupled Device (CCD) image sensor or a Complementary Metal Oxide Semiconductor (CMOS) image sensor is used as an image pickup device for capturing and processing an image.

The CMOS image sensor may include a plurality of field insulating layers 120 for separating unit pixels on a semiconductor substrate 10, as shown in Korean Patent Laid-Open Publication No. 2004-0060508 (see FIG. 5); A photodiode array 14 formed in an active region between the field insulating films 12 for photoelectric conversion of the received light into an electrical signal; A light transmitting layer (16) comprising a plurality of interlayer insulating films and device protection films for transmitting the received light; A planarization layer 18 formed on the light transmission layer 16 for uniform light transmission; A color filter unit 20 formed of a color photoresist on the planarization layer 18; It consists of a micro lens array 22 formed on the top of the color filter 20 to focus the received light to the photodiode array (14).

The CMOS camera is formed of a plurality of arrays to recognize the depth of the photographed subject, and to form an image using the contrast ratio.

In order to use the CMOS array in the touch screen as in the present invention, the entire surface of the touch screen must be received, and since the depth of the subject does not greatly influence, the device is formed using 1 to 2 arrays and a black and white CMOS array. It is advisable to lower the price of the.

Hereinafter, described in detail with reference to the preferred embodiments and the accompanying drawings as follows.

1 to 3, in the present invention, each of the corners of the rectangular frame 100 is formed with a reflector plate 200, and a CMOS array fixed to the frame 100 so as to be spaced apart from the respective reflector plates 200 ( 300 is characterized in that each formed.

The frame 100 is formed on the outer circumference of the image surface 500 and is formed in a quadrangular shape to fix the CMOS array 300 and the reflector 200.

The CMOS array 300 is a black and white camera composed of 1 to 2 arrays, and is formed to detect an image moving on the image surface 500 by a predetermined interval by the reflector 200.

Each photodiode configured to receive the CMOS array 300 may receive light incident on the image surface 500 by the reflector 200 as illustrated in FIG. 1.

A case 510 is formed at an upper end of the frame 100, and the case 510 is formed so that the front surface thereof is blocked, and a hole of 2 to 3 mm is formed at an edge portion of the frame 100, that is, a reflective plate 200. The receiving window 215 is formed.

The reflective plate 200 may be formed in a curved shape, and the center reflective surface 230 may be formed to have a width of 2 to 3 mm.

Each light source may be provided at a position of each of the reflecting plates 200, respectively, to increase the contrast ratio of the CMOS array receiving the light at a diagonal position.

The light source may be an infrared ray having good linearity or may be formed by forming a polarizing filter on the entire surface of white light.

By using the distance between the reflector 200 and the CMOS array 300, the light receiving height can be minimized, thereby minimizing the influence of disturbance light.

Hereinafter, the operation of the touch screen formed by the preferred embodiment of the present invention will be described.

For ease of explanation, the CMOS array 300 formed at the upper left of the frame 100 is 300a, the CMOS array 300 formed at the lower left is 300b, and the CMOS array 300 formed at the lower right is 300c at the upper right. The formed CMOS array 300 is numbered 300d and described.

Recognition of the image is sequentially scanned in the order of 300d in the CMOS array 300a.

If the depression occurs at the I position, the CMOS array 300 of 300a recognizes θ1 and I1 where the dark portions indicate peaks, and forms the position line L1 of the virtual line 300a-I1.

The CMOS array 300 of 300a recognizes θ2 and I2 in which dark portions represent peaks, and forms a position line L2 of 300b-I2 which is an imaginary line.

The CMOS array 300 of 300c recognizes θ3 and I3 in which dark portions indicate peaks, and forms a position line L3 of 300c-I3 which is an imaginary line.

The 300d CMOS array 300 recognizes θ4 and I4 in which dark portions indicate peaks, and forms a position line L4 of 300d-I4 which is an imaginary line.

The virtual line calculates the pressed position I using L1 to L4, and by calculating the average by finding the intersection of each line, the coordinates of the pressed position I can be calculated more accurately.

In addition, since a plurality of virtual lines are generated, all of them can be recognized even if a plurality of pressed positions are generated, thereby enabling multi-touch.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications may be made therein without departing from the scope of the invention, which is covered by the following claims.

As described above, according to the touch screen of the present invention, the following effects occur.

(1) The pressed position can be easily identified by using the CMOS array.

(2) The configuration is simple, but the precision for identifying the pressed position is high.

(3) It is hardly affected by disturbance light.

(4) Multi-touch is possible because a number of pushed positions can be recognized.

Claims (6)

Each array of rectangular frame 100 is formed with a reflector 200, CMOS arrays, characterized in that the CMOS array 300 is fixed to the frame 100 to be spaced apart from each of the reflector 200, respectively Touch screen using. The method of claim 1, A case 510 is formed at an upper end of the frame 100, and the case 510 is formed so that the front surface thereof is blocked, and a hole of 2 to 3 mm is formed at an edge portion of the frame 100, that is, a reflective plate 200. Touch screen using a CMOS array, characterized in that the receiving window 215 is formed. The method of claim 1, The CMOS array 300 is a touch screen using a CMOS array, characterized in that consisting of one or two rows of photodiodes. The method according to claim 1 or 2, The reflective plate 200 is formed in a curved shape, the touch screen using a CMOS array, characterized in that the center reflecting surface 230 is formed to have a width of 2 ~ 3mm. Reflectors 200 are formed at each corner of the rectangular frame 100, and CMOS arrays 300 fixed to the frame 100 are formed to be spaced apart from the respective reflecting plates 200, respectively. Touch screen using a CMOS array, characterized in that the light source is formed to emit light in a diagonal direction at the same position as). The method of claim 5, The light source is formed of infrared light or white light, when the white light, the touch screen using a CMOS array, characterized in that the polarization filter is formed on the front surface.

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