TWI500313B - Image scanning system and method of controlling the same - Google Patents

Description

Image scanning system and control method thereof

The present invention relates to an image scanning system and a control method thereof, and more particularly to an image scanning system composed of a touch screen and a control method thereof.

Due to the rapid development of display panel technology, the current screen can provide other functions in addition to the function of displaying images. For example, a touch screen has a touch panel that allows the user to click on the screen and interact with the host computer. Nowadays, the optical touch panel has further developed into a panel that can scan an image of an object.

Please refer to FIG. 1 , which is a schematic diagram of a screen composed of a conventional optical touch panel. The screen 100 includes a display panel 110, a gate driving circuit 115, a source driving circuit 120, a sensing circuit 130, a control circuit 140, and A memory 150. The display panel 110 is an optical touch panel. Furthermore, the gate driving circuit 115 sequentially supplies the gate driving signals G(1), G(2), ..., G(n), or scan line signals, to the display panel 110. The display material 125 on the source driving circuit 120 can be sent to the corresponding pixel in the display panel 110 and the display image can be presented.

Furthermore, each pixel of the display panel 110 further includes a light detecting unit, which can generate a corresponding light detecting signal 135, and according to the gate driving signals G(1), G(2).. The control of .G(n) sequentially outputs the photo detection signal 135 generated by the photodetecting unit in the corresponding pixel to the sensing circuit 130.

That is to say, all the light detecting units in the display panel 110 are arranged to form a light detecting array, and the backlight detecting light source (not shown) of the screen 100 is used to make the light detecting array according to the gate driving signal G of the display panel ( 1), G(2)...G(n) sequentially scans the objects placed on the display panel 110, and generates corresponding photodetection signals 135 to be transmitted to the sensing circuit 130. Furthermore, the sensing circuit 130 can perform the analog-to-digital operation of the photo-detection signal 135 and output the digital photo-detection signal to the control circuit 140, and the control circuit 140 sequentially stores the memory to the memory according to the received digital photodetection signal. Body 150.

Moreover, the control circuit 150 can further send the digital light detection signal in the memory 140 to the host computer (not shown), so that the host computer can reconstruct the object image according to the received digital light detection signal, and display the object image. It is displayed on the display panel 110 for the user to watch.

For example, assume that the user places a name card as an object on the display panel 110 having a resolution of 1024×768. According to the control of the gate driving signals G(1), G(2)...G(n), the light detecting array in the display panel 110 can sequentially output the analog light detecting signal 135 of 1024×768. To the sensing circuit 130, the digital light detecting signal of 1024×768 pens is stored in the memory 150 via the control circuit 140, and the control circuit 140 can further read the digital light detection of 1024×768 pens from the memory 150. The signal is output to the host computer, so that the computer host can reconstruct the image of the business card according to the received digital light detection signal, and display the image of the business card on the display panel 110 for the user to watch.

Obviously, since the area of the business card is much smaller than the area of the display panel 110, if the control circuit 140 transmits all of the 1024×768 digital photodetection signals to the host computer, the signal between the control circuit 140 and the host computer will be generated. The transmission efficiency of the line is reduced.

The object of the present invention is to provide an image scanning system and a control method thereof. The control circuit only provides the address information of the effective data to the computer host to improve the transmission performance of the signal line between the control circuit and the computer host.

The present invention provides an image scanning system, which is connected to a computer host, and includes a display panel having a light detecting array, and the light detecting array sequentially scans the display panel on the display panel according to the plurality of gate driving signals of the display panel. The object image, and corresponding to the plurality of analog light detection signals; the analog to digital conversion unit converts the received analog light detection signal into a digital light detection signal; the memory; and the control circuit uses the threshold value Sequentially comparing gray scale values in the digital light detection signal, and defining all gray scale values as valid data or invalid data, and storing them in a corresponding address of the memory; wherein the control circuit records the memory as valid The corresponding address information of the data is transmitted to the host computer, so that the computer host reconstructs the image of the object.

The invention provides a control method for an image scanning system. The display panel of the image scanning system has a light detecting array, and the light detecting array sequentially scans the image of the object placed on the display panel according to the plurality of gate driving signals, and Generating a corresponding analog light detection signal, comprising the steps of: converting an analog light detection signal into a digital light detection signal; sequentially comparing gray scale values in the digital light detection signal with a threshold value, and defining all grays The order value is valid data or invalid data, and the valid data is stored in the corresponding address of the memory; and the corresponding address information recorded in the memory as valid data is transmitted to the host computer to reconstruct the object image.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Please refer to FIG. 2 , which is a schematic diagram of an image scanning system composed of the optical touch panel of the present invention. The image scanning system includes a screen 200 and a computer host 250. The screen 200 includes a display panel 210, an analog to digital conversion unit 220, a control circuit 230, and a memory 240. The display panel 210 is an optical touch panel, and the optical touch panel further includes a light detecting array. Moreover, the display panel 210 gate driving signal is sequentially provided, so that the light detecting unit in the light detecting array can generate a corresponding analog light detecting signal 225 to analog to digital converting unit 220.

Therefore, the backlight source (not shown) of the screen 210 is used to enable the photodetection array to sequentially scan the objects placed on the display panel 210 according to the gate driving signals of the display panel, and generate corresponding analog light detecting signals 225. Transfer to analog to digital conversion unit 220. The analog-to-digital conversion unit 220 performs an analog-to-digital conversion operation on the analog optical detection signal 225 and outputs a digital light detection signal to the control circuit 230. Each of the digital photodetection signals represents a grayscale value corresponding to the position of the display panel 210.

In order to increase the signal transmission performance between the control circuit 230 and the host computer 250, according to an embodiment of the present invention. A threshold value is set in the control circuit 230, and the threshold value is used to compare the grayscale values in all the digital light detection signals, and further define that all the digital light detection signals are valid data or invalid data, and Stored in memory 240 in sequence. That is to say, with the above functions, the control circuit 230 can distinguish the valid foreground data and the invalid background data, and transmit the valid foreground data and its address information to the host computer 250.

Moreover, when the digital light detection signal is stored in the memory 240 by the control circuit 230 of the present invention, it is stored in a one-to-one correspondence. That is to say, the digital photodetection signal generated at any position on the display panel 210 is stored in a specific address in the memory 240. Therefore, the value stored in any address in the memory 240 is the display panel 210. The gray scale value of the digital photodetection signal at the corresponding position.

According to the above characteristics, the control circuit 230 only needs to transmit the corresponding address information recorded as valid data in the memory 240 to the computer host 250, so that the computer host 250 reconstructs the object image according to the received address information. And the object image is displayed on the display panel 210 for the user to watch.

Please refer to FIG. 3, which illustrates a first embodiment of address information in an image scanning system. It is assumed that an object 215 is placed on the display panel 210, and the display panel 210 has six drive signals. The analog circuit detection signal corresponding to the first driving signal G(1) is converted into a digital light detecting signal, and the control circuit 230 is sequentially stored in the memory 240. Since the position where the first driving signal G(1) is located is not covered by the object 215, the control circuit 230 compares and confirms that all the digital light detecting signals are invalid background data. Similarly, the position a on the display panel 210 is on the second driving signal G(2), and the control circuit 230 compares the digital photo detection signal at the position a as valid foreground data and stores it in the memory 240. ADD_a address, and other information is invalid background information.

Similarly, the positions b and c on the display panel 210 are overlaid on the third driving signal G(3), and the control circuit 230 compares the x-digit digital light detecting signals between the positions b and c as valid. The foreground data is stored between the ADD_b and ADD_c addresses of the memory 240, and the other data is invalid background information. The other locations in the memory 240 are written in the same manner, and therefore will not be described again.

After all the digital photodetection signals are recorded in the memory, the control circuit 230 can transmit the corresponding address information and gray scale values recorded in the memory 240 as valid data to the computer host 250. That is, the y-digit digital light detection between the x-digit digital light detection signals Db~Dc, ADD_d and ADD_e addresses between the digital light detection signals Da, ADD_b and ADD_c addresses in the ADD_a address The z-digit digital light detecting signal Df~Dg between the signals Dd~De, ADD_f and ADD_g addresses, and the one-digit light detecting signal Dh of the ADD_h address. Therefore, the host computer 250 can reconstruct the object image of the grayscale attribute.

Of course, the control circuit 230 can also transfer the boundary of the object 215 to the host computer 250 first. That is to say, the control circuit 230 first transmits all the start address and the end address representing the boundary as the address information to the host computer 250. Taking Figure 3 as an example, the address information includes: ADD_a address, ADD_b, ADD_c, ADD_d address, ADD_e, ADD_f, ADD_g address, ADD_h. With this address information, the boundary of the object 215 can be established.

Alternatively, control circuit 230 adds the starting address representing the boundary plus the number of consecutive addresses as the address information. Taking Figure 3 as an example, the address information includes: ADD_a address, number of consecutive addresses 1, ADD_b, number of consecutive addresses x, ADD_d, number of consecutive addresses y, ADD_f, number of consecutive addresses z, ADD_h, consecutive bits The number of addresses is 1.

Therefore, based on the boundary established by the address information, the host computer 250 can further obtain the grayscale value of the object image to reconstruct the image of the object.

Of course, if the scanning system of the present invention only needs black and white object images, the control circuit 240 only needs to adjust the connection values and record the compared valid data in the memory. The control circuit 230 only transmits the address information corresponding to the valid data to the computer host 250. The computer host 250 can further obtain object images of black and white attributes.

Please refer to FIG. 4 , which illustrates a method for controlling an image scanning system composed of the optical touch panel of the present invention. First, converting the received analog optical detection signal into a digital light detection signal (step S310); then, using a threshold value to compare the grayscale value in the digital light detection signal, and defining the grayscale value system to be effective Data or an invalid data, and storing the valid data in a memory corresponding address (step S320); and transmitting the corresponding address information recorded as valid data in the memory to a computer host to reconstruct the object image (Step S330).

In summary, the image scanning system and the control method thereof of the present invention can improve the transmission performance of the signal line between the control circuit 230 and the host computer 250. That is to say, the control circuit 230 of the present invention only provides address information of valid data to improve transmission performance.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100. . . Screen

110. . . Display panel

115. . . Gate drive circuit

120. . . Source drive circuit

125. . . Display data

130. . . Sense circuit

135. . . Light detection signal

140. . . Control circuit

150. . . Memory

200. . . Screen

210. . . Display panel

215. . . object

220. . . Analog to digital conversion unit

225. . . Analog light detection signal

230. . . Control circuit

240. . . Memory

250. . . Computer host

FIG. 1 is a schematic diagram of a screen composed of a conventional optical touch panel.

FIG. 2 is a schematic diagram of an image scanning system composed of an optical touch panel of the present invention.

Figure 3 is a diagram showing a first embodiment of address information in an image scanning system.

FIG. 4 is a diagram showing a control method of an image scanning system composed of an optical touch panel of the present invention.

210. . . Display panel

215. . . object

240. . . Memory

Claims (14)

An image scanning system is connected to a computer host, comprising: a display panel, the display panel has a light detecting array, and the light detecting array is sequentially scanned according to the plurality of gate driving signals of the display panel An image of the object on the display panel, and corresponding to the plurality of analog light detection signals; a analog to digital conversion unit that converts the received analog light detection signals into a plurality of digital light detection signals; a memory; and a control circuit for sequentially comparing a plurality of grayscale values in the digital light detection signals by using a threshold value, and defining all of the grayscale values to belong to a valid data or an invalid data, And storing the address corresponding to the memory; wherein the control circuit transmits the corresponding address information recorded as valid data in the memory to the host computer, so that the computer host reconstructs the object image. The image scanning system of claim 1, wherein the control circuit transmits the corresponding address information and gray scale value recorded as valid data in the memory to the computer host, so that the computer host reconstructs a Object image of grayscale attributes. The image scanning system of claim 1, wherein the display panel is an optical touch panel. The image scanning system of claim 1, wherein the address information includes a boundary of the image of the object. The image scanning system of claim 4, wherein the address information comprises a start address and an end address. The image scanning system of claim 4, wherein the computer host obtains a grayscale value of the object image according to the boundary to reconstruct the object image. The image scanning system of claim 1, wherein the address information comprises a start address and a continuous address number. A method for controlling an image scanning system, a display panel of the image scanning system has a light detecting array, and the light detecting array sequentially scans an object placed on the display panel according to the plurality of gate driving signals The image and the corresponding plurality of analog light detecting signals include the following steps: converting the analog light detecting signals into a plurality of digital light detecting signals; and sequentially comparing the digital light detecting signals by using a threshold value Measure a plurality of grayscale values in the signal, and define all of the grayscale values to belong to a valid data or an invalid data, and store the valid data in a corresponding address of a memory; and the memory The corresponding address information recorded as valid data is transmitted to a computer host to reconstruct the object image. The method for controlling an image scanning system according to claim 8 , further comprising: transmitting corresponding address information and gray scale values recorded as valid data in the memory to the computer host to reconstruct a gray Object image of the order attribute. The control method of the image scanning system of claim 8, wherein the display panel is an optical touch panel. The method for controlling an image scanning system according to claim 8 , further comprising the computer host establishing a boundary of the image of the object according to the address information. The method for controlling an image scanning system according to claim 11, wherein the address information includes a start address and an end address. The method for controlling an image scanning system according to claim 11, further comprising obtaining a grayscale value of the image of the object according to the boundary to reconstruct the image of the object. The method for controlling an image scanning system according to claim 8, wherein the address information includes a starting address and a number of consecutive addresses.