TWI382337B - Touch screen system with light reflection - Google Patents

Description

Touch screen system improvement

The invention relates to a touch screen, in particular to a touch screen formed by the principle that the LED infrared light wave is blocked and reflected.

According to the touch-sensitive screen, the sensing device is mainly a digital capacitive structure, which comprises two sensing layers respectively disposed below and above the touch screen body, and the two sensing layers are respectively grounded and connected to a control circuit. During operation, a capacitive effect is generated by the moment the user touches the finger or the conductor, and the position of the finger or the conductor can be determined by the change of the capacitance value. However, the touch type of the finger or the conductor position is determined by the change of the capacitance value. Screens often have the disadvantage of being damaged by deformation stress.

Later, some people developed a touch screen that uses infrared light to block the position of the finger or conductor. However, this structure requires a number of one-to-one transmission and reception pairs arranged in a row or linearly along the screen. It can sense the intervention of the touch body, and this structure has a high cost.

Therefore, in order to effectively solve the above-mentioned shortcomings, the inventor of the present invention developed a touch screen device formed by the reflection principle of LED infrared light wave blocking.

The invention provides an improvement of the touch screen system, which is mainly provided with LED infrared emitting receivers at appropriate positions on the left and right sides of the screen, and the emitting end of the transmitting receiver can emit LED infrared light waves and is full on the surface of the screen. Spherical wave, when the surface of the screen receives the intrusion of the touch body, the Spherical Wave will be blocked by the interference and reflected, and the reflection band is the transmitting receiver. The receiving end senses that after receiving the reflected signal, the receiving end will calculate the position coordinates of the touch body through the core logic unit, and in addition to the advantages of low manufacturing cost and rapid signal transmission, the conventional capacitive type can be improved. The touch screen is lack of deformation damage due to the repeated stress, which effectively improves the service life of the touch screen and achieves universal use.

Referring to the first figure, a screen (1) is mainly included, and an LED infrared emitting receiver (11) is respectively disposed at appropriate positions on both sides of the screen (1), and the LED infrared emitting receiver (11) The device also has a device for emitting LED infrared light waves and receiving light waves, which is called a transmitting end (111) and a receiving end (112), and the infrared light waves emitted by the emitting end (111) at both ends can form a spherical wave (Spherical) Wave) forms an image signal sensing network that fills the entire screen. When a touch object (13) intrudes into the image sensing network, the LED infrared light wave is blocked and reflected to the receiving end (112). Receiving the reflected light wave to extract the target image separately, and transmitting the target image to the LED infrared image signal capturing circuit (2) electrically connected thereto, after passing through the noise filter (3) Transfer to the image analysis circuit (4), compare the two target images by the core logic operation (41), and perform calculation to locate the touch object (13) corresponding to the two target images on the screen (1) The location on the top.

The core logic operation method described above is that after the light wave is emitted from the transmitting end (111) and touched to the touch body (13) and reflected to the receiving end (112), there is a time difference between transmitting and receiving. The time difference is multiplied by the speed of light to calculate the distance between the touch body (13) and the LED infrared light wave transmitting receiver (11), and the center point of the transmitting end (111) and the receiving end (112) is used as a center point to calculate The distance forms a quarter circle for the diameter, and the LED infrared emitting receivers (11) at both ends are respectively formed with a quarter circle in this way, and two quarter circles are formed on the screen (1). An interlaced point that is known as the coordinate position of the touch object (13) on the screen after the operation.

Referring to the second figure, the second figure is another preferred embodiment, which mainly divides the transmitting end (111) and the receiving end (112) which are originally present in one component at different positions on the screen, that is, The two transmitting ends (111) are placed diagonally, and the two receiving ends (112) are also placed diagonally; in other words, each transmitting end (111) and each receiving end (112) are located on the screen. On the same side of (1), the two transmitting ends (111) of the diagonal setting can also emit LED infrared light waves to make the screen (1) full of spherical waves (Spherical Wave), when there is a touch body (13) When the wavelength is blocked by invading the Spherical Wave, the blocked wavelength forms a reflection and is inductively received by the receiving end (112) to form a target image, and the target image is transmitted to be electrically connected thereto. LED infrared The image signal acquisition circuit (2) is transmitted to the image analysis circuit (4) after passing through the noise filter (3), and the two target images are compared and calculated by the core logic operation (41). The position of the touch object (13) corresponding to the two target images on the screen (1) is located.

The foregoing core logic operation mode is the same as that described in the first figure, and is also transmitted after the light wave is emitted from the transmitting end (111) and touched to the touch body (13) and reflected as the receiving end (112). The time difference between the reception and the reception, the time difference is multiplied by the speed of light to calculate the distance between the touch body (13) and the LED infrared light wave transmitting receiver (11), at the middle of the transmitting end (111) and the receiving end (112). For the center point, the calculated distance is a quarter circle formed by the diameter, and the two quarter circles form an interlacing point on the screen (1), which is known as The coordinate body (13) is at the coordinate position on the screen.

The technology disclosed in this case must be implemented by people familiar with the technology, and its unprecedented practices and enhancements are also patentable, and applications for patents are filed according to law. However, the above embodiments are not sufficient to cover the scope of patents to be protected in this case, and therefore the scope of the patent application is attached.

1‧‧‧ screen

11‧‧‧LED infrared emitting receiver

111‧‧‧transmitter

112‧‧‧ Receiver

13‧‧‧ Touch body

2‧‧‧Infrared image signal capture circuit

4‧‧‧Image Analysis Circuit

3‧‧‧ Noise Filter

41‧‧‧ core logic operations

The first figure is a structural system diagram of the improved touch screen system of the present invention.

The second figure is a structural system diagram of another embodiment of the improved touch screen system of the present invention.

1‧‧‧ screen

11‧‧‧LED infrared emitting receiver

111‧‧‧transmitter

112‧‧‧ Receiver

13‧‧‧ Touch body

2‧‧‧Infrared image signal capture circuit

3‧‧‧ Noise Filter

4‧‧‧Image Analysis Circuit

41‧‧‧ core logic operations

Claims (6)

A touch screen system improvement comprising: a screen; at least one LED infrared emitting receiver is located at an appropriate position of the screen, wherein the emitting end and the receiving end of the LED infrared transmitting receiver are disposed in the same component; an LED infrared image signal capturing circuit, Forming an electrical connection with the LED infrared emitting receiver to capture a target image sensed by the receiving end of the LED infrared emitting receiver; and an image analyzing circuit electrically connected to the LED infrared image signal capturing circuit The target image is calculated to locate the position of the touch body on the screen. The touch screen system as described in claim 1 further includes a noise filter electrically connected between the LED infrared image signal capturing circuit and the image analyzing circuit. The improvement of the touch screen system as described in the first paragraph of the patent protection scope is calculated by multiplying the time difference of the light wave from the transmission to the reception by the speed of light to obtain the distance, and then centering on the middle between the transmitting end and the receiving end. The calculated distance is a quarter circle of the diameter, and the intersection of the two quarter circles is the coordinate position of the touch body on the screen. A touch screen system improvement comprises: a screen; at least one LED infrared emitting receiver located at an appropriate position of the screen, respectively having two transmitting ends and two receiving ends, wherein two transmitting end pairs The corner line is placed, and the two receiving ends are also placed diagonally; an LED infrared image signal capturing circuit is electrically connected with the LED infrared emitting receiver to extract the infrared transmitting receiver through the LED The target image sensed by the receiving end; and an image analyzing circuit electrically connected to the LED infrared image signal capturing circuit, and the target image is calculated to position the touch object on the screen. The touch screen system as described in claim 1 further includes a noise filter electrically connected between the LED infrared image signal capturing circuit and the image analyzing circuit. The improvement of the touch screen system as described in the first paragraph of the patent protection scope is calculated by multiplying the time difference of the light wave from the transmission to the reception by the speed of light to obtain the distance, and then centering on the middle between the transmitting end and the receiving end. The calculated distance is a quarter circle of the diameter, and the intersection of the two quarter circles is the coordinate position of the touch body on the screen.