CN101510036B - Liquid crystal display panel, liquid crystal display device and control method thereof - Google Patents

Abstract

The invention provides a liquid crystal display panel, a liquid crystal display device and a control method thereof, wherein the liquid crystal display panel comprises a first substrate and a second substrate; the first substrate comprises pixels, sensing pads arranged near the pixels, switches electrically coupled to the sensing pads, pixel gate lines electrically coupled to the pixels, sensing gate lines electrically coupled to the switches, and reading lines; the second substrate includes a sensing device formed on the second substrate in a protruding manner and a conductive layer covering the sensing device and electrically coupled to a predetermined power source. When the second substrate and the first substrate are combined, the sensing device is opposite to the sensing pad, and when the second substrate is pressed, the conductive layer covered on the sensing device is contacted with the sensing pad, and whether the switch is conducted is controlled by the sensing grid line so as to determine whether the sensing pad is electrically conducted with the reading line. The liquid crystal display panel and the circuit structure design of the liquid crystal display device can obtain a dense effective sensing area, and high touch detection performance is realized at lower cost.

Description

Liquid crystal display panel, liquid crystal display device and control method thereof

technical field

The invention relates to the technical field of liquid crystal display, and in particular to a liquid crystal display panel integrated with a touch function, a liquid crystal display device and a control method thereof.

Background technique

Liquid crystal display devices are widely used in consumer electronics products such as mobile phones, notebook computers, desktop display devices and televisions due to their advantages of high image quality, small size, light weight and wide application range, and have gradually replaced The traditional cathode ray tube display device has become the mainstream of the display device.

The touch screen provides a new interface for human-computer interaction, which is more intuitive and humane in use. At present, many countermeasures for directly integrating the touch function into the panel manufacturing of the liquid crystal display device have been proposed; among them, the push-type touch screen has the advantages of not being affected by ambient light and being in line with human intuition, so it is becoming more and more popular. more attention. However, how to provide a touch screen integrated with a liquid crystal display panel with high touch detection performance at a lower cost is still one of the current concerns.

Contents of the invention

One of the objectives of the present invention is to provide a liquid crystal display panel integrated with a touch function.

Another object of the present invention is to provide a liquid crystal display device.

Another object of the present invention is to provide a method for controlling a liquid crystal display device.

A liquid crystal display panel proposed by an embodiment of the present invention includes a first substrate and a second substrate. The first substrate includes a first pixel, a first sensing pad, a first switch, a first pixel gate line, a first sensing gate line and a first reading line; the first sensing pad is arranged near the first pixel , the first switch is electrically coupled to the first sensing pad, the first pixel gate line is electrically coupled to the first pixel, and the first sensing gate line is electrically coupled to the first switch. The second substrate includes a first sensing device and a conductive layer. The first sensing device protrudes from the second substrate. The conductive layer covers the first sensing device and is electrically coupled to a predetermined power source. Wherein, when the second substrate and the first substrate are combined, the first sensing device is opposite to the first sensing pad, and when the second substrate is pressed, the conductive layer covered on the first sensing device is aligned with the first sensing pad. The pads are in contact with each other, and the first sensing gate line controls whether the first switch is turned on to determine whether the first sensing pad is electrically connected to the first reading line.

In an embodiment of the present invention, the first substrate further includes a second pixel and a second sensing pad, and the second sensing pad is arranged near the second pixel; wherein, the first sensing gate line controls the second pixel Whether a switch is turned on determines whether the second sensing pad is electrically connected to the first reading line.

In an embodiment of the present invention, the first substrate further includes a second reading line and a second switch, the second switch is electrically coupled to the first sensing gate line, and the first sensing gate line Controlling whether the second switch is turned on; wherein, the second readout line is electrically coupled to the first readout line. Furthermore, the first substrate may further include a third pixel, a third sensing pad, a third switch, a second pixel gate line, and a second sensing gate line, and the third sensing pad is disposed on the third Near the pixel, the third switch is electrically coupled between the third sensing pad and the second reading line, the second pixel gate line is electrically coupled to the third pixel, and the second sensing gate line is electrically coupled The third switch is connected to control whether the third switch is turned on; wherein, the second sensing gate line is electrically coupled to the first sensing gate line.

In an embodiment of the present invention, the first substrate further includes a second reading line, a third pixel, a third sensing pad, a third switch, a second pixel gate line, and a second sensing gate line, the third sensing pad is disposed near the third pixel, the third switch is electrically coupled between the third sensing pad and the second reading line, and the second pixel gate line is electrically coupled to the third pixel The second sensing gate line is electrically coupled to the third switch to control whether the third switch is turned on; wherein, the second sensing gate line is electrically coupled to the first sensing gate line.

Another embodiment of the present invention provides a liquid crystal display device, which includes the above-mentioned liquid crystal display panel and a detection circuit; the detection circuit is electrically coupled to the first reading line (and the second reading line) to detect the first The signal on the read line (and the second read line).

A liquid crystal display device proposed by another embodiment of the present invention includes a plurality of first pixels, a plurality of sensing pads, a plurality of reading lines, a plurality of switches, a plurality of pixel gate lines, and a plurality of sensing gates line, and a gate drive circuit; these sensing pads are respectively arranged in the vicinity of the corresponding ones of the first pixels, and these sensing pads generate different signals according to whether the corresponding position of the liquid crystal display device is pressed; these switches are respectively arranged at Between the sensing pads and the corresponding reading lines; the pixel gate lines are electrically coupled to the first pixels to drive the first pixels; the sensing gate lines are respectively electrically coupled to the switches The corresponding ones are used to control whether the corresponding ones of the switches are turned on; the gate driving circuit is used for driving the pixel gate lines and the sensing gate lines. Wherein, at least two reading lines are electrically coupled to each other or at least two sensing gate lines are electrically coupled to each other.

In an embodiment of the present invention, at least two reading lines of the liquid crystal display device are electrically coupled to each other and at least two sensing gate lines are electrically coupled to each other.

In an embodiment of the present invention, the liquid crystal display device further includes a detection circuit and a storage device; the detection circuit is electrically coupled to these reading lines to receive signals transmitted by these reading lines, and the received The signal is converted into pressing data; the storage device is electrically coupled to the detection circuit to store the pressing data.

In an embodiment of the present invention, each of the sensing pads is respectively disposed at the opaque places of the corresponding first pixels.

In an embodiment of the present invention, the first pixels are respectively surrounded by a plurality of other pixels in the liquid crystal display device except for the first pixels.

Another embodiment of the present invention proposes a control method for a liquid crystal display device, which is used in the liquid crystal display device. The control method includes making each of these sensing gate lines and each of these pixel gate lines have the same The length of enabling time. Further, the control method may further include: simultaneously enabling at least two of the sensing gate lines, and/or simultaneously receiving signals transmitted by at least two of the reading lines.

Another method for controlling a liquid crystal display device proposed by another embodiment of the present invention is applicable to a liquid crystal display device. The liquid crystal display device includes a plurality of pixels, a plurality of sensing pads, a plurality of pixel gate lines, and a plurality of sensing pads. Sensing gate lines, these pixel gate lines are used to drive these pixels, and these sensing gate lines are used to drive these sensing pads, these sensing gate lines are not electrically coupled to these pixel gate lines And the number of these sensing gate lines is less than the number of these pixel gate lines; the control method includes: making each of these sensing gate lines and each of these pixel gate lines have the same enable time length; and When each of the pixel gate lines is enabled, at least one of the sensing gate lines is also enabled at the same time.

The embodiment of the present invention adopts the unique circuit structure design of the liquid crystal display panel and the liquid crystal display device, such as the design that the pixel gate line and the sensing gate line are separated from each other, the specific sensing pad layout, and the mutual electrical conductivity of multiple reading lines. Coupling and/or multiple sensing gate lines are designed to be electrically coupled to each other to obtain a denser effective sensing area, thereby achieving high touch detection performance at a lower cost.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 shows a structural block diagram of a liquid crystal display device integrated with a touch function proposed by an embodiment of the present invention.

FIG. 2 shows a cross-sectional view of a partial structure of a liquid crystal display panel related to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a partial structure of the liquid crystal display panel shown in FIG. 2 when it is pressed by a finger.

FIG. 4 shows a cross-sectional view of a partial structure of a liquid crystal display panel related to another embodiment of the present invention.

FIG. 5 shows a partial circuit diagram of a thin film transistor array substrate related to an embodiment of the present invention.

FIG. 6 shows a partial circuit diagram of another thin film transistor array substrate related to an embodiment of the present invention.

FIG. 7 shows a partial circuit diagram of another thin film transistor array substrate related to an embodiment of the present invention.

FIG. 8 shows a partial circuit diagram of another thin film transistor array substrate related to an embodiment of the present invention.

Figure number:

100: liquid crystal display device

10: Liquid crystal display panel

16: Gate drive circuit

18: Detection circuit

19: storage device

12: TFT array substrate

121a, 121b: sensing pads

123: pixels

125: First bump

127: Second bump

13: Liquid crystal layer

14: Second substrate

141: Conductive layer

143: Sensing device

145: first photosensitive spacer

147: Second photosensitive spacer column

SW: switch

SGLm, SGLm+1: Sensing gate lines

PGLn, PGLn+1, PGLn+2: pixel gate lines

DLp, DLp+1, DLp+2: data lines

RLq, RLq+1, RLq+2: Read lines

Detailed ways

The above and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

Referring to FIG. 1 , it shows a structural block diagram of a liquid crystal display device 100 integrated with a touch function proposed by an embodiment of the present invention. The liquid crystal display device 100 includes a liquid crystal display panel 10 , a gate driving circuit 16 , a detection circuit 18 and a storage device 19 .

Referring to FIG. 2 and FIG. 3, FIG. 2 shows a partial structural sectional view of the liquid crystal display panel 10, and FIG. 3 shows a partial structural sectional view of the liquid crystal display panel 10 when pressed by an object such as a finger (not shown in the figure). . The liquid crystal display panel 10 includes a thin film transistor array substrate 12 , a liquid crystal layer 13 and a second substrate 14 (such as a color filter substrate). 2 shows that the thin film transistor array substrate 12 includes a sensing pad 121a (121b) and a pixel 123, and the sensing pad 121a (121b) is arranged near the pixel 123, and is located at an opaque place of the pixel 123 such as a black matrix area; The second substrate 14 includes a sensing device 143 and a conductive layer 141 covering the sensing device 143. The sensing device 143 protrudes from the second substrate 14. The conductive layer 141 is electrically coupled to a predetermined power source such as the liquid crystal display panel 10 The known common voltage Vcom. When the second substrate 14 and the TFT array substrate 12 are combined, the sensing device 143 is opposite to the corresponding sensing pad 121 a ( 121 b ), and the liquid crystal layer 13 is sandwiched between the second substrate 14 and the TFT array substrate 12 . As shown in FIG. 3 , when the second substrate 14 is pressed by a finger, the conductive layer 141 covered on the sensing device 143 at the pressed position is in contact with the corresponding sensing pad 121a ( 121b ).

Further, referring to FIG. 4, a plurality of insulated first bumps 125 and a plurality of insulated second bumps 127 can be further provided on the thin film transistor array substrate 12, and a plurality of first insulated bumps 127 can be arranged on the second substrate 14 accordingly. Photo spacer columns (Photo Spacer) 145 and a plurality of second photosensitive spacer columns 147. The first bump 125 and the second bump 127 have different heights, and the first photosensitive spacer column 145 and the second photosensitive spacer column 147 have substantially the same height as the sensing device 143 and are covered by the conductive layer 141 . When combining the second substrate 14 and the thin film transistor array substrate 12, the first photosensitive spacer column 145 is opposite to the corresponding first bump 125, and the distance between the two is larger than the sensing device 143 and the sensing pad 121a (121b ), the second photosensitive spacer column 147 is opposite to the corresponding second bump 127 and the distance between the two is substantially zero. Such configuration can maintain the gap (Gap) between the second substrate 14 and the TFT array substrate 12 through the second photosensitive spacer column 147 and the second bump 127, and can maintain the gap (Gap) between the second substrate 14 and the thin film transistor array substrate 12 through the first photosensitive spacer column 145 and the second bump 127. The first bump 125 is used to prevent the liquid crystal display panel 10 from being damaged due to excessive force caused by partial excessive bending when the liquid crystal display panel 10 is pressed.

5, which depicts a partial circuit diagram of the thin film transistor array substrate 12 related to the embodiment of the present invention; the gate drive circuit 16, the detection circuit 18 and the storage device 19 of the liquid crystal display device 100 are arranged on the thin film transistor array substrate 12 superior. As shown in FIG. 5, the thin film transistor array substrate 12 includes a plurality of pixels 123, a plurality of pixel gate lines PGLn, PGLn+1, PGLn+2, a plurality of data lines DLp, DLp+1, DLp+2, a plurality of sensor The measuring pads 121a and 121b, a plurality of reading lines RLq, RLq+1, RLq+2, a plurality of switches SW, and a plurality of sensing gate lines SGLm, SGLm+1. These pixels 123 respectively include a thin film transistor (not marked in FIG. 5 ) and a pixel electrode (not marked in FIG. 5 ) electrically coupled to the source of the thin film transistor, and pixel gate lines PGLn, PGLn+1, PGLn+2 electrically The gates of the thin film transistors of these pixels 123 are electrically coupled to drive the first pixels 123 , and the data lines DLp, DLp+1, DLp+2 are electrically coupled to the drains of these pixels 123 to provide display data to these pixels 123 . Sensing pads 121a and 121b are respectively disposed near corresponding ones of these pixels 123, and these sensing pads 121a and 121b generate different sensing signals according to whether the corresponding positions of the liquid crystal display device 100 are pressed; here, adjacent The two sensing pads 121a and 121b are electrically coupled to each other and electrically coupled to a corresponding one of the read lines RLq, RLq+1, RLq+2 through the same switch, and the sensing pads 121a or 121b are arranged nearby Each of the pixels 123 is surrounded by other pixels 123 that are not adjacent to the sensing pads 121a and 121b. These switches SW are respectively disposed between the sensing pads 121a and 121b and one of the corresponding reading lines RLq, RLq+1, RLq+2; these sensing gate lines SGLm, SGLm+1 are respectively electrically coupled to The corresponding ones of the switches SW control the conduction of the corresponding ones of the switches SW to drive the corresponding ones of the sensing pads 121a and 121b.

According to the above, the pixel gate lines PGLn, PGLn+1, PGLn+2 are electrically coupled to the gate driving circuit 16 and driven by the gate driving circuit 16 . The sensing gate lines SGLm, SGLm+1 are designed separately from the pixel gate lines PGLn, PGLn+1, PGLn+2 (that is, they are not electrically coupled), and their number is smaller than the pixel gate lines PGLn, PGLn+1 , the number of PGLn+2; these sensing gate lines SGLm, SGLm+1 are electrically coupled to different signal channels (Channel) of the gate driving circuit 16 and are driven by the gate driving circuit 16 . The read lines RLq, RLq+1, and RLq+2 are electrically coupled to different signal channels of the detection circuit 18 and transmit sensing signals to the detection circuit 18, so that the detection circuit 18 converts the received sensing signals is the pressing data (that is, the pressing position coordinates). The storage device 19 is electrically coupled to the detection circuit 18 to store pressing data.

In addition, the sensing gate lines SGLm and SGLm+1 in the above embodiments of the present invention are not limited to one-to-one correspondence with the signal channels of the gate driving circuit 16, and multiple adjacent sensing gate lines can also be used to correspond to a single The electrical coupling mode of the signal channel; similarly, the read lines RLq, RLq+1, RLq+2 are not limited to one-to-one correspondence with the signal channels of the detection circuit 16, and multiple adjacent read lines can also be used to correspond The electrical coupling method of a single signal channel. For example, as shown in FIG. 6, two adjacent sensing gate lines SGLm and SGLm+1 are connected to each other to be electrically coupled to a single signal channel of the gate drive circuit 16; or, for example, as shown in FIG. The read lines RLq, RLq+1 are connected to each other to be electrically coupled to a single signal channel of the detection circuit 18, where the detection circuit 18 regards the signals transmitted by the read lines RLq, RLq+1 as the same data; or for example As shown in FIG. 8, two adjacent sensing gate lines SGLm, SGLm+1 are connected to each other to be electrically coupled to a single signal channel of the gate drive circuit 16, and two adjacent reading lines RLq, RLq The +1 interconnects are electrically coupled to a single signal channel of the detection circuit 18 .

In addition, since the liquid crystal display device 100 proposed in the embodiment of the present invention adopts a design in which the sensing gate lines SGLm, SGLm+1 and the pixel gate lines PGLn, PGLn+1, and PGLn+2 are separated from each other, the liquid crystal display device In the control process of 100, each sensing gate line SGLm, SGLm+1 and each pixel gate line PGLn, PGLn+1, PGLn+2 have the same enable time length. Specifically, the purpose of enabling the same time can be achieved in the following ways: for example (1) when enabling each pixel gate line, also enable one of the sensing gate lines at the same time; or (2) when enabling the pixel gate line Enable the sensing gate line SGLm at the same time as PGLn, and then turn off all the sensing gate lines while enabling the pixel gate line PGLn+1 and enable sensing while enabling the pixel gate line PGLn+2. Gate line SGLm+1, and so on.

Furthermore, for the electrical coupling of the multiple (for example two) adjacent sensing gate lines corresponding to a single signal channel of the gate drive circuit 16, the gate drive circuit 16 will simultaneously enable these mutual connected sensing gate lines; of course, the control method of simultaneously enabling a plurality of sensing gate lines by changing the circuit design of the gate drive circuit 16 is also applicable to different gate lines electrically coupled to the gate drive circuit 16. Multiple sense gate lines for the signal channel. Similarly, for the electrical coupling mode in which the multiple (for example two) adjacent readout lines correspond to a single signal channel of the detection circuit 18, the detection circuit 18 will simultaneously receive signals transmitted by these interconnected readout lines. Of course, the control method of simultaneously receiving the sensing signals transmitted by multiple reading lines by changing the circuit design of the detection circuit 18 is also applicable to multiple signals electrically coupled to different signal channels of the detection circuit 18. read line.

The embodiments of the present invention are designed through the unique circuit structure design of the liquid crystal display panel and the liquid crystal display device, such as the design that the pixel gate line and the sensing gate line are separated from each other, a specific sensing pad layout, and a plurality of readout lines. Designs such as electrical coupling and/or electrical coupling of multiple sensing gate lines to each other can obtain a denser effective sensing area, thereby achieving high touch detection performance at a lower cost.

In addition, those skilled in the art can also make appropriate changes to the liquid crystal display panel, liquid crystal display device, and control method thereof proposed in the embodiments of the present invention, such as appropriately changing the layout of the sensing pad on the thin film transistor array substrate, the sensing gate The layout of the electrode lines, the layout of the readout lines, and/or the pixel gate lines and the sensing gate lines are driven by different driving circuits and so on.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention should be defined by the claims.

Claims (10)

1. a display panels is characterized in that, said display panels comprises:

One first substrate comprises:

One first pixel;

One first sensor pad is disposed near said first pixel;

One first switch is electrically coupled to said first sensor pad;

One first pixel gates line is electrically coupled to said first pixel;

One first sensing gate line is electrically coupled to said first switch; And

One first read line; And

One second substrate comprises:

One first sensing apparatus, tab-like being formed on said second substrate; And

One conductive layer covers said first sensing apparatus and is electrically coupled to a preset power supply;

Wherein, When said second substrate of combination and said first substrate; Said first sensing apparatus is relative with said first sensor pad; And when pushing said second substrate, make the said conductive layer that is covered on said first sensing apparatus contact with said first sensor pad, and the said first sensing gate line is controlled said first switch, and whether conducting is to determine whether electrically conduct between said first sensor pad and said first read line.

2. display panels as claimed in claim 1 is characterized in that, said first substrate also comprises:

One second pixel; And

One second sensor pad is disposed near said second pixel;

Wherein, the said first sensing gate line is controlled said first switch whether conducting is to determine whether electrically conduct between said second sensor pad and said first read line.

3. display panels as claimed in claim 2 is characterized in that, said first substrate also comprises:

One second reading line taking; And

One second switch is electrically coupled to the said first sensing gate line, and the said first sensing gate line is controlled the whether conducting of said second switch;

Wherein, said second reading line taking and said first read line electric property coupling mutually.

4. display panels as claimed in claim 3 is characterized in that, said first substrate also comprises:

One the 3rd pixel;

One the 3rd sensor pad is arranged near said the 3rd pixel;

One the 3rd switch is electrically coupled between said the 3rd sensor pad and the said second reading line taking;

One second pixel gates line is electrically coupled to said the 3rd pixel; And

One second sensing gate line is electrically coupled to said the 3rd switch to control the whether conducting of said the 3rd switch;

Wherein, the said second sensing gate line and said first sensing gate line electric property coupling mutually.

5. display panels as claimed in claim 2 is characterized in that, said first substrate also comprises:

One second reading line taking;

One the 3rd pixel;

One the 3rd sensor pad is arranged near said the 3rd pixel;

One the 3rd switch is electrically coupled between said the 3rd sensor pad and the said second reading line taking;

One second pixel gates line is electrically coupled to said the 3rd pixel; And

One second sensing gate line is electrically coupled to said the 3rd switch to control the whether conducting of said the 3rd switch;

Wherein, the said second sensing gate line and said first sensing gate line electric property coupling mutually.

6. a liquid crystal indicator is characterized in that, said liquid crystal indicator comprises:

One display panels, said display panels comprises:

One first substrate comprises:

One first pixel;

One first read line;

One first sensor pad is disposed near said first pixel;

One first switch is electrically coupled between said first sensor pad and said first read line;

One first pixel gates line is electrically coupled to said first pixel; And

One first sensing gate line is electrically coupled to said first switch to control the whether conducting of said first switch; And

One second substrate comprises;

One first sensing apparatus, tab-like being formed on said second substrate; And

One conductive layer covers said sensing apparatus and is electrically coupled to a preset power supply; And

One testing circuit is electrically coupled to said first read line to detect the signal on said first read line;

Wherein, When said second substrate of combination and said first substrate; Said first sensing apparatus is relative with said first sensor pad, and when pushing said second substrate, makes the said conductive layer that is covered on said first sensing apparatus contact with said first sensor pad.

7. liquid crystal indicator as claimed in claim 6 is characterized in that, said first substrate also comprises:

One second pixel; And

One second sensor pad is disposed near said second pixel;

Wherein, the said first sensing gate line is controlled said first switch whether conducting is to determine whether electrically conduct between said second sensor pad and said first read line.

8. liquid crystal indicator as claimed in claim 7 is characterized in that, said first substrate also comprises:

One second reading line taking; And

One second switch is electrically coupled to the said first sensing gate line, and the said first sensing gate line is controlled the whether conducting of said second switch;

Wherein, said testing circuit is regarded as same data with the signal that said first read line and said second reading line taking are transmitted.

9. liquid crystal indicator as claimed in claim 8 is characterized in that, said first substrate also comprises:

One the 3rd pixel;

One the 3rd sensor pad is arranged near said the 3rd pixel;

One the 3rd switch is electrically coupled between said the 3rd sensor pad and the said second reading line taking;

One second pixel gates line is electrically coupled to said the 3rd pixel; And

One second sensing gate line is electrically coupled to said the 3rd switch to control the whether conducting of said the 3rd switch;

Wherein, the said second sensing gate line and said first sensing gate line electric property coupling mutually.

10. liquid crystal indicator as claimed in claim 7 is characterized in that, said first substrate also comprises:

One second reading line taking;

One the 3rd pixel;

One the 3rd sensor pad is arranged near said the 3rd pixel;

One the 3rd switch is electrically coupled between said the 3rd sensor pad and the said second reading line taking;

One second pixel gates line is electrically coupled to said the 3rd pixel; And

One second sensing gate line is electrically coupled to said the 3rd switch to control the whether conducting of said the 3rd switch;

Wherein, the said second sensing gate line and said first sensing gate line electric property coupling mutually.

Images