TW201415335A - Touch-control display device and its driving method - Google Patents

Abstract

The present invention provides an touch-control display device and its driving method for touching an LCD panel and obtaining a position signal representative of touching a specific position of the LCD panel. The device includes a plurality of driving lines and touch lines sequentially arranged on the LCD panel in parallel, wherein a touch line is disposed between two adjacent driving lines; a plurality of sensing lines sequentially arranged to be vertical with the driving lines and touch lines; a gate driver connected to the plurality of driving lines; a plurality of output stages, each being sequentially connected to one of every two driving lines and one of every two touch lines; and a touch sensing circuit connected to the plurality of sensing lines, so as to obtain a touch position by directly touching the LCD panel.

Description

Touch display device and driving method thereof

The present invention relates to a touch display device and a driving method thereof, and more particularly to a touch display device suitable for a Thin Film Transistor Liquid Crystal Display (TFT-LCD) and a driving method thereof.

In today's society, liquid crystal display devices with touch functions have gradually become the trend of current consumer electronic products, such as smart phone screens, digital camera panels, and displays on tablets. However, if there is a touch function on the liquid crystal display, the current common method is to separate the touch panel from the liquid crystal display, and then assemble the touch panel together with the liquid crystal display, and generally use a mutual touch type touch panel. .

Please refer to FIG. 1A , which is a schematic diagram of a conventional mutual-sensing touch panel. As shown in FIG. 1A, the mutual-sensing touch panel 405 has a plurality of transmission lines Tx1-Txn in the X direction and a plurality of sensing lines Rx1-Rxn in the Y direction. The above-mentioned touch detection method is to sequentially drive the transmission lines Tx1-Txn on the mutual-sensing touch panel 405, and simultaneously detect whether the transmission lines Tx1-Txn are received through the sensing lines Rx1-Rxn. Signal. Please refer to FIG. 1B as a schematic diagram of a block P of a conventional mutual-capacitive capacitive touch panel. When the finger is pressed to the specific position A of the mutual touch panel 405 (ie, the transmission line Tx2 and the sensing lines Rx2 and Rx3), the voltage signals on the transmission line Tx2 and the sensing lines Rx2 and Rx3 will be different from the other transmission lines Tx1. Tx3-Txn, sensing line Rx1 Rx4-Rxn voltage signal. From this, it can be known which position the finger touches to the touch panel 405 (here, the specific position A). After the production, the group device is mounted on the liquid crystal display to enable the liquid crystal display to have a touch function at the same time.

In other words, the current display with a touch function actually has a touch function after the liquid crystal display itself is superimposed with a set of touch panels, and the liquid crystal display itself has a touch function. In addition, although the above-mentioned technology can make the liquid crystal display have a touch function, the above-mentioned technology is superimposed on the liquid crystal display by the touch panel, which causes a problem that the weight of the liquid crystal display becomes heavy, the cost becomes high, and the overall brightness decreases.

The inventor of the present invention, in the spirit of active invention, considers a "touch display device and its driving method", and uses the gate driving signal sequentially outputted by the gate driving unit of the current liquid crystal display as a sensing basis. In order to make the liquid crystal display have the function of touch, after several research experiments, the present invention is completed.

In view of the problem that the touch function and the display function need to be separately produced, the present invention utilizes the gate driving signals sequentially transmitted to the plurality of gate driving lines by the gate driving unit in the general liquid crystal display as a sensing basis, and transmits through multiple The output stage transmits the gate driving signal to the touch driving line as the touch detection, and senses the signal state of the touch driving line through the touch sensing circuit unit, so as to directly touch the liquid crystal display to obtain the touch The purpose of the location. Therefore, the present invention does not need to separately fabricate the touch panel to increase the weight and volume, and even does not require the touch panel cost at all. At the same time, multiple output stages, The connection relationship between the touch driving line and the gate driving line can also prevent the gate driving signal transmitted in sequence from interfering with the adjacent gate driving line without causing the problem that the gate driving line is repeatedly opened.

In order to achieve the above object, the present invention provides a touch display device for obtaining a position signal that contacts a specific position of a liquid crystal display panel by touching a liquid crystal display panel. The touch display device includes a plurality of gate driving lines, a plurality of touch driving lines, a plurality of touch sensing lines, a gate driving unit, a plurality of output stages, and a touch sensing circuit unit. The plurality of gate driving lines, the plurality of touch driving lines, and the plurality of touch sensing lines are all sequentially disposed on the liquid crystal display panel. A plurality of touch driving lines are sequentially arranged in parallel between two adjacent gate driving lines for sensing. The plurality of touch sensing lines are arranged in a vertical direction corresponding to the plurality of gate driving lines and the touch driving lines to detect the signal state on the touch driving line.

The gate driving unit is connected to the plurality of gate driving lines to respectively generate a plurality of gate driving signals and sequentially provide to each of the gate driving lines. Each of the output stages sequentially connects the gate driving lines to each of the gate driving lines, and sequentially connects the touch driving lines to each of the touch driving lines to output a touch driving signal according to the gate driving signals. . The touch driving signal transmitted by the output stage does not affect the gate driving line connected to the next output stage, and the gate driving line connected to the lower output stage is used for displaying the liquid crystal display panel. The plurality of transistor switches are not properly turned on. The touch sensing circuit unit is connected to a plurality of touch sensing lines. The plurality of touch driving lines are divided into a plurality of groups, and the touch driving lines in the same group are connected to each other to be connected through the touch sensing circuit unit. The plurality of touch sensing lines detect whether the touch driving signals of each group are in a state of contacting a certain position, and correspondingly generate a position signal. That is, if a touch sensing line connected to the touch sensing circuit unit detects that the touch driving signal on a group is a signal state in which a specific position on the liquid crystal display panel is touched, the obtained The location signal of the above specific location.

In addition, the plurality of output stages of the present invention may be diodes to prevent improper conduction of the plurality of transistor switches for display of the liquid crystal display panel.

Furthermore, the plurality of groups of the present invention can include three output stages.

Furthermore, the plurality of gate drive signals of the present invention can be square wave signals.

In addition, the plurality of groups of the present invention combined with a plurality of touch sensing lines can correspond to respective positions of the liquid crystal display panel. If the specific position is touched, the touch sensing circuit unit can detect the continuous square wave signal of the touch driving signal of the group of the specific position in the touch sensing line of the specific position, but the touch The sensing line detects that a capacitance value between the touch driving line and the touch sensing line changes.

The present invention also provides a touch display driving method for a touch display device to obtain a position signal that contacts a specific position of the liquid crystal display panel by touching a liquid crystal display panel. The system comprises a plurality of gate driving lines and touch driving lines arranged in parallel on the liquid crystal display panel, wherein the touch driving lines are disposed between two adjacent gate driving lines, and the plurality of sequentially and plural gates a driving line and a plurality of touch sensing lines, a touch sensing line disposed vertically, a gate driving unit connecting a plurality of gate driving lines, a plurality of output stages, and each output stage is sequentially connected to every gate driving line The touch driving line and the touch driving line are sequentially connected to the touch driving line and the touch sensing circuit unit connected to the plurality of touch sensing lines. The method comprises the steps of: (A) generating, in a gate driving unit, a plurality of gate driving signals for a plurality of gate driving lines in sequence, and sequentially transmitting to a plurality of output stages; (B) a plurality of outputs; In the stage, a touch driving signal is output according to the plurality of gate driving signals generated in sequence; wherein the plurality of touch driving lines are divided into a plurality of groups, and the touch driving lines in the same group are connected to each other; In the touch sensing circuit unit, the touch sensing signals of each group are sequentially detected to be in contact with a certain position through a plurality of touch sensing lines, and the position signals are generated correspondingly.

The above summary and the following detailed description are exemplary in order to further illustrate the scope of the claims. Other objects and advantages of the present invention will be described in the following description and drawings.

First, please refer to FIG. 2, which is a schematic diagram of a touch display device according to a preferred embodiment of the present invention. As shown in FIG. 2, the touch display device is configured to generate a position signal Sp that is in contact with a specific position of the liquid crystal display panel 100 by touching a liquid crystal display panel 100. The touch display device includes a plurality of gate driving lines Ld1-Ldn, a plurality of touch driving lines Lt1-Ltn, a plurality of touch sensing lines Ls1-Lsm, a gate driving unit 140, a plurality of output stages 160, and a Touch sensing circuit unit 150. The gate driving lines Ld1-Ldn, the touch driving lines Lt1-Ltn, and the touch sensing lines Ls1-Lsm are all sequentially disposed on the liquid crystal display panel. And the touch driving lines Lt1-Ltn are sequentially arranged in parallel The gate drive lines (eg, the touch drive lines Lt1 of the present embodiment are disposed in parallel between the gate drive lines Ld1 and Ld2) are used as sensing basis. The touch sensing lines Ls1-Lsm are disposed opposite to the gate driving lines Ld1-Ldn and the touch driving lines Lt1-Ltn, wherein the touch driving lines Lt1-Ltn and the touch sensing lines Ls1-Lsm are mutually Each of the interleaving portions has a coupling capacitor to detect the state of the signal on the touch driving lines Lt1-Ltn.

The gate driving unit 140 is connected to the gate driving lines Ld1-Ldn, respectively, to sequentially supply the gate driving signals Ss1-Ssn to each of the gate driving lines Ld1-Ldn. Each output stage 160 is electrically connected to at least one touch driving line, and the other end is electrically connected to any one of the gate driving lines in sequence to output a touch driving signal according to the gate driving signal. (For example, the three output stages 160 of the embodiment are respectively connected to the gate driving lines Ld1, Ld3, and Ld5, and are correspondingly connected to the touch driving lines Lt1, Lt3, and Lt5) to output the touch driving signal St1- Str. In this embodiment, the gate driving signals Ss1-Ssn are square wave signals. Therefore, it can be seen from the above connection manner that the touch driving signal transmitted by the output stage 160 will not affect the gate driving line connected to the next output stage 160, and the gate driving line connected to the lower output stage is formed. It is used as an abnormal conduction of a plurality of transistor switches (not shown in the drawings) for displaying the liquid crystal display panel 100. For example, the touch driving signal St1 connected to the output stage 160 of the gate driving line Ld1 in this embodiment will not affect the plurality of transistor switches connected to the gate driving line Ld3 of the next output stage 160. Abnormal conduction. Wherein, the gate driving line Ld3 sequentially connects the gates of the plurality of transistor switches, and each gate driving line Ld1-Ldn and The corresponding plurality of transistor switches are generally used to display the main components and technologies of the liquid crystal display panel 100, and thus are not described herein.

The touch sensing circuit unit 150 is connected to the touch sensing lines Ls1-Lsm, wherein the plurality of touch driving lines Ls1-Lsm are divided into a plurality of groups G1-Gr, and the touch driving lines in the same group are The touch sensing circuit unit 150 detects the change of the coupling capacitance in each group when the output driving stage 160 outputs the touch driving signals to the corresponding touch driving lines. The result of the current or voltage change (for example, the group G1 of the embodiment is composed of the touch driving lines Lt1-Lt5, the gate driving lines Ld1-Ld5, and the three output stages 160, and the touch driving lines Lt1-Lt5 Connected to each other, and the three output stages 160 are respectively connected to the touch driving line Lt1 and the gate driving line Ld1, the touch driving line Lt3 and the gate driving line Ld3, and the touch driving line Lt5 and the gate driving line Ld5. Therefore, the touch driving lines Lt1-Lt5 are all driven by the touch driving signal St1). Please refer to FIG. 3, which is a timing diagram of the gate driving signals Ss1-Ss5 of the group G1 and the touch driving signal St1 according to a preferred embodiment of the present invention. As shown in FIG. 3, since the touch driving lines Lt1-Lt5 are connected to each other, the gate driving signals Ss1, Ss3, and Ss5 are respectively transmitted to the touch driving lines Lt1, Lt3, and Lt5 via the respective output stages 160, so that the touch is made. The timing of controlling the driving signal St1 will sequentially generate a high-potential, low-potential, high-potential, low-potential, high-potential timing relationship due to the relationship of the output stage 160, wherein the abscissa is the time axis t. Of course, the timing relationship between the gate driving signals of the other groups G2-Gr and the touch driving signals is also like the group G1, so it will not be described here.

Then, the touch driving signals of each group G1-Gr are detected through the touch sensing lines Ls1-Lsm connected to the touch sensing circuit unit 150. Whether St1-Str is in a state of being in contact with a certain position, and correspondingly generating a position signal Sp. That is, if a touch sensing line connected to the touch sensing circuit unit 150 detects a touch driving signal on a certain group (for example, the touch sensing line Ls2 of the embodiment detects a group). The touch driving signal St1) on the G1 is a state in which the specific position on the liquid crystal display panel 100 is touched, and the position signal Sp of the specific position is obtained. In this embodiment, the group G1-Gr combined with the touch sensing lines Ls1-Lsm can be combined into various positions of the liquid crystal display panel 100, and can be used as the basis for outputting the position signal Sp. In this embodiment, if the specific position is touched, the touch sensing circuit unit 150 will detect the touch driving signal of the group of the specific position as continuous in the touch sensing line at the specific position. The grounding signal Ls2 of the present embodiment detects that the touch driving signal St1 on the group G1 is a continuous ground signal. Then, a position signal Sp representing the specific position on the touch sensing line Ls2 and the group G1 is generated correspondingly.

Next, please refer to FIG. 4 and FIG. 5 at the same time. 4 is a flow chart of a driving method of a touch display according to a preferred embodiment of the present invention. FIG. 5 is a schematic view showing a specific position of the liquid crystal display panel according to a preferred embodiment of the present invention. Hereinafter, the specific position B of the liquid crystal display panel 100 is pressed with a finger, and the plurality of output stages 160 are all diodes. As shown in FIG. 5, in order to detect whether the liquid crystal display panel 100 is pressed by a finger, the gate driving unit 140 generates gate driving signals Ss1-Ssn for the gate driving lines Ld1-Ldn in sequence, and sequentially transmits the same. The gate drive signals Ss1, Ss3, Ss5, ..., Ssn to a plurality of output stages 160 (step S510).

Next, the plurality of output stages 160 will output touch drive signals St1, St2, ..., Str, according to the gate drive signals Ss1, Ss3, Ss5, ..., Ssn, where r < n. The touch driving signals on the touch driving lines of the same group are driven by the same timing (for example, the timing signals on the touch driving lines Lt1 - Lt5 of the group G1 in this embodiment are the touch driving signals St1) ( Step S520).

Then, the touch sensing circuit unit 150 sequentially detects whether the touch driving signals St1-Str of each group G1-Gr are in contact with the liquid crystal display panel 100 through the touch sensing lines Ls1-Ls2. If the touch driving signals of the group of the specific positions are detected to change the coupling capacitance, it is determined that the object touches the touch sensing device, and the position signal Sp is generated correspondingly (step S530). In addition, the group G1-Gr combined with the touch sensing lines Ls1-Lsm can be combined into various positions of the liquid crystal display panel 100, and can be used as the basis for outputting the position signal Sp.

Therefore, when the finger is pressed to the specific position B of the liquid crystal display panel 100 (in the present embodiment, the touch driving lines Lt1 and Lt2 and the touch sensing lines Ls1 and Ls2), the touch sensing circuit unit 150 will be in the touch sensing line. When the continuous current or voltage change result caused by the change of the coupling capacitance of the touch drive signal St1 of the group G1 is detected on Ls1 and Ls2, the corresponding representative finger is pressed on the touch sensing lines Ls1, Ls2 and the group G1. The position signal Sp above.

Therefore, it can be known that the gate driving signal outputted by the gate driving unit of the general liquid crystal display is used as a sensing basis, and the gate driving signal is transmitted to the touch driving line through a plurality of output stages to generate a touch driving signal. The position of the signal of the touch driving line is sensed through the touch sensing circuit unit, and the position of the touchable position of the liquid crystal display can be directly touched. The effect. This makes the case not only need to make another touch panel to increase the weight and volume, or even the touch panel cost. The connection relationship between the plurality of output stages, the touch driving line and the gate driving line can also prevent the sequentially transmitted gate driving signals from interfering with the adjacent gate driving lines without causing the gate driving lines to be repeated. Open the question.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

100‧‧‧LCD panel

140‧‧‧Gate drive unit

150‧‧‧Touch sensing circuit unit

160‧‧‧Output

Sp‧‧‧ position signal

405‧‧‧Interactive touch panel

Ld1-Ldn‧‧‧ gate drive line

Lt1-Ltn‧‧‧Touch drive line

Ls1-Lsm‧‧‧ touch sensing line

St1~Str‧‧‧ touch drive signal

Ss1~Ssn‧‧‧ gate drive signal

G1~Gr‧‧‧Group

Tx1-Txn‧‧‧ transmission line

Rx1-Rxn‧‧‧Induction line

A‧‧‧ specific location

B‧‧‧Specific location

T‧‧‧ timeline

P‧‧‧ Block

X‧‧‧ direction

Y‧‧‧ direction

S510, S520, S530‧‧‧ steps

FIG. 1A is a schematic diagram of a conventional mutual inductance capacitive touch panel.

FIG. 1B is a schematic diagram of a block P of a conventional mutual inductance capacitive touch panel.

2 is a schematic diagram of a touch display device according to a preferred embodiment of the present invention.

FIG. 3 is a timing diagram of the gate driving signal and the touch driving signal of the group G1 according to a preferred embodiment of the present invention.

4 is a flow chart of a driving method of a touch display according to a preferred embodiment of the present invention.

FIG. 5 is a schematic view showing a specific position of contacting a liquid crystal display panel according to a preferred embodiment of the present invention.

100‧‧‧LCD panel

140‧‧‧Gate drive unit

150‧‧‧Touch sensing circuit unit

160‧‧‧Output

Ld1-Ldn‧‧‧ gate drive line

Lt1-Ltn‧‧‧Touch drive line

Ls1-Lsm‧‧‧ touch sensing line

St1~Str‧‧‧ touch drive signal

Ss1~Ssn‧‧‧ gate drive signal

G1~Gr‧‧‧Group

Sp‧‧‧ position signal

Claims (10)

A touch display device includes: a plurality of gate driving lines; a plurality of touch driving lines disposed between the gate driving lines; and a plurality of touch sensing lines sequentially disposed on the liquid crystal display panel And the gate drive lines and the touch drive lines are opposite to each other, wherein the touch drive lines and the touch sense lines have a coupling capacitance in a staggered manner; a gate drive The unit is respectively connected to the gate driving lines, and sequentially provides a gate driving signal to each of the gate driving lines; a plurality of output stages, each of which is electrically connected to at least one of the touch driving lines The other end is electrically connected to any one of the gate driving lines to output a touch driving signal according to the gate driving signal; and a touch sensing circuit unit is connected to the touch sensing lines The touch sensing circuit unit detects changes in the coupling capacitances when the output stages output the touch driving signals to the corresponding touch driving lines. The touch display device of claim 1, wherein the plurality of output stages are diodes. The touch display device of claim 1, wherein the touch drive lines are divided into a plurality of groups, and the touch drive lines in the same group are connected to each other. The touch display device of claim 3, wherein each group comprises at least two output stages. The touch display device of claim 1, wherein the touch sensing circuit unit detects a current or voltage change result caused by the change of the coupling capacitance. The touch display device of claim 1, wherein the plurality of gate drive signals are square wave signals. The touch display device of claim 1, wherein if the specific position is touched, the touch sensing circuit unit detects the touch sensing line at the specific position. The touch driving signal of the group in the specific position is a continuous square wave signal, and the touch sensing line detects that the coupling capacitance value between the touch driving line and the touch sensing line changes. A touch display driving method is used for a touch display device to obtain a position signal indicating a specific position of the liquid crystal display panel by touching a liquid crystal display panel, the touch display device comprising a plurality of The plurality of gate driving lines and the plurality of touch driving lines are disposed in parallel on the liquid crystal display panel, and the touch driving lines are disposed between the gate driving lines, and the plurality of touch sensing lines are The plurality of gate driving lines and the plurality of touch driving lines are oppositely disposed, and each of the touch driving lines and the touch sensing lines are mutually staggered with a coupling capacitor, and the plurality of gate driving lines are connected The gate driving unit, the plurality of output stages, and one end of each output stage are electrically connected to at least one touch driving line, and the other end is electrically connected to any one of the gate driving lines, and one Connecting the touch sensing circuit unit of the touch sensing lines, the method comprising the steps of: (A) in the gate driving unit, sequentially generating a plurality of gate driving signals for the plurality of gate driving lines, and sequentially transmitting to the plurality of output stages; (B) the plurality of output stages Outputting a touch driving signal according to the received gate driving signal, wherein the plurality of touch driving lines are divided into a plurality of groups, and the touch driving lines in the same group are connected to each other; and (C In the touch sensing circuit unit, the plurality of touch sensing lines are sequentially detected to detect whether the change of the coupling capacitance of each group is in a contact state, and corresponding to the specific position being contacted. The location signal. The driving method of the touch display according to the eighth aspect of the invention, wherein, in the step (C), if the specific position is touched, the touch sensing circuit unit touches the specific position Controlling the sensing line, detecting that the touch driving signal of the group in the specific position is a continuous square wave signal, but the touch sensing line is detected between the touch driving line and the touch sensing line The value of this coupling capacitor will vary. The driving method of the touch display of claim 8, wherein each of the groups includes at least two output stages.