TWM449306U - Liquid crystal display device with touch control circuit - Google Patents

Abstract

??? A liquid display device with a touch circuit according to the present invention is disclosed. The liquid display device includes a common electrode circuit, a touch circuit and a display panel. The display panel includes a common electrode and a touch panel. The touch panel includes sensing electrodes, switching elements, control electrode lines and detecting electrode lines which are disposed on the common electrode. In order to detect and obtain touch status of the touch panel, the common electrode circuit outputs a touch driving signal to the common electrode for generating coupling signals from the sensing electrodes and the control circuit drives the switching elements via the control electrode lines to carry out the transmission of the coupling signals from the sensing electrodes to the touch circuit via the detecting electrode lines. Thereby, the touch panel disposed in the display panel can simplify design of the touch circuit.

Description

Liquid crystal display device with touch circuit

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device with a touch circuit.

With the rapid development of today's technology, the variety of information products has been updated to meet the different needs of the public. Since the liquid crystal display (LCD) has the advantages of light and thin, low radiation dose and low power consumption, the conventional display device has a large volume, high power consumption and high radiation dose, so the display on the market today The device will gradually replace the conventional display device by the liquid crystal display device, and thus the liquid crystal display device has become the mainstream of the current display device market. Furthermore, based on the fact that today's input devices are gradually biased towards the development direction of intuitive input, a touch panel is derived for use with a display device, and the light-thinness of the liquid crystal display device allows the touch panel to be matched with the liquid crystal display device. Control the mainstream of display devices, such as: tablets, smart phones, ALL-IN-ONE computers.
A touch display device is further developed. The touch display device is generally provided with a touch panel on the display device, so that the touch panel provides a touchable area according to the display screen of the display device for the user to The touch object displayed on the screen performs a touch operation. Please refer to the first figure, which is a schematic structural diagram of a conventional touch display device. As shown in the figure, the touch display device 10 is provided with a display panel 11 and a touch panel 12. The display panel 11 is provided with an array substrate 111, an array circuit 112, a liquid crystal layer 113, a common electrode 114, and a primary color. Layer 115 and a color filter substrate 116. The touch panel 12 is provided with a sensing array circuit 121 and a touch substrate 122. The array circuit 112 is disposed on the array substrate 111, the liquid crystal layer 113 is disposed on the array circuit 112, the common electrode 114 is disposed on the liquid crystal layer 113, and the three primary color layers 115 are disposed on the common electrode 114. The color filter substrate is disposed. The sensing array circuit 121 is disposed on the color filter substrate 116 , and the touch substrate 122 is disposed on the sensing array circuit 121 . That is to say, the touch panel 12 is directly superposed on the display panel 11 , thereby causing an increase in the overall thickness of the touch display device 10 .
In order to reduce the thickness of the touch panel, the touch mode is changed first, that is, from the resistive touch to the capacitive touch, and the research and development direction of the touch panel is mostly modified to reduce the thickness of the sensing array circuit, that is, The dual-layer sensing array circuit is modified to a single-layer sensing array circuit. However, the touch panel still needs to provide a touch substrate on the sensing array circuit to protect the sensing array circuit. The touch display device of the present invention combines the touch panel and the display panel to form a touch display by using a bonding process, and the touch panel fails to effectively reduce the thickness based on the setting of the touch substrate.
In view of this, the present invention proposes a liquid crystal display device with a touch circuit, which improves the thickness of the conventional touch display device and reduces the setting of the touch substrate, thereby further reducing the thickness.

One of the objectives of the present invention is to provide a liquid crystal display device with a touch circuit, which provides a touch panel disposed in the display panel, thereby eliminating the need to provide a touch substrate.
The purpose of the present invention is to provide a liquid crystal display device with a touch circuit, which directly uses a common electrode as a touch driving signal source to drive the sensing electrodes to couple and generate a touch sensing signal, thereby simplifying the touch circuit. design.
The present invention provides a liquid crystal display device with a touch circuit, which comprises a display panel, a common electrode circuit and a touch circuit. The display panel is provided with a common electrode and a touch panel, and the touch panel is disposed above the common electrode. The touch panel is provided with a plurality of sensing electrodes, a plurality of switching units, a plurality of control electrode lines and a plurality of detecting electrode lines. The common electrode circuit is coupled to the common electrode and outputs a touch driving signal (Vcom) to the common electrode. The touch circuit is coupled to the contact control panel and is provided with a control circuit and a signal detecting circuit. The control circuit is coupled to the control electrode lines. Transmitting the scan signal to the switch units via the electrode control lines to drive the switch units to be turned on, the signal detection circuit is coupled to the detection electrode lines, the detection electrode lines are coupled to the switch units, and the signal detection circuit is A threshold value and a coupled signal are used to detect the touch state of the sensing electrodes.
In order to give your reviewers a better understanding and understanding of the structural features and the efficacies achieved, please refer to the best example diagrams and detailed explanations to illustrate:

Please refer to FIG. 2, FIG. 3 and FIG. 4, which are a partial cross-sectional view, a circuit diagram and an enlarged view of a third diagram of a liquid crystal display device according to an embodiment of the present invention. As shown in the figure, the liquid crystal display device 20 of the present invention comprises a display panel 21, a common electrode circuit 218 and a touch circuit 22. The display panel 21 includes an array substrate 211, an array circuit 212, a liquid crystal layer 213, a common electrode 214, a touch panel 23 and a color filter substrate 215, and the display panel 21 further includes a three primary color layer 216. As shown in the third figure, the touch circuit 22 includes a control circuit 221 and a signal detection circuit 222. The touch panel 23 includes a plurality of sensing electrodes 231 , a plurality of switching units 232 , a plurality of control electrode lines 233 , and a plurality of detecting electrode lines 234 . The liquid crystal display device 20 further includes a display circuit 217.
Referring to the second to fourth figures, wherein the second figure is a cross-sectional view of the section line AA' shown in the fourth figure, and the fourth figure is an enlarged view of a partial area of the touch panel 23 shown in the third figure. It is an enlarged schematic view of block B shown in the third figure. The array circuit 212 is disposed on the array substrate 211, the liquid crystal layer 213 is disposed on the array circuit 212, the common electrode 214 is disposed on the liquid crystal layer 213, the three primary color layers 216 are disposed on the common electrode 214, and the touch panel 23 is disposed on the Above the three primary color layers 216, the color filter substrate 215 is disposed on the touch panel 23. As shown in the third figure, the sensing electrodes 231, the switching units 232, the control electrode lines 233, and the detecting electrode lines 234 are disposed above the common electrode 214, and further, the embodiment is 6X6. The array of the sensing electrodes 231 is exemplified, but the present invention is not limited thereto, and may be adjusted according to the resolution of the display panel 21.
Referring to the third figure, the control circuit 221 and the signal detecting circuit 222 are disposed on the touch circuit 22, and the control circuit 221 is coupled to the control electrode lines 233, and thus coupled to the control panel 23 via the control electrode lines 233. The switch unit 232, the control circuit 221 transmits the plurality of scan signals V _g1 ... V _gn to the control electrode lines 233, and thus to the switch units 232 to drive the switch units 232 to be turned on or off; The circuit 222 is coupled to the detection electrode lines 234 , and thus the switch units 232 are coupled via the detection electrode lines 234 . The sensing units 232 are respectively disposed above the common electrodes 214. For example, the sensing electrodes 231 are located within the setting range of the common electrode 214. Thus, the common electrode 214 corresponds to all of the sensing electrodes 231. The common electrode circuit 218 is disposed in the display circuit 217 , and the common electrode circuit 218 is coupled to the common electrode 214 to output a touch driving signal V _COM1 . . . V _COMn to the common electrode 214.
Therefore, the sensing electrodes 231 are coupled to the touch driving signals V _COM1 ... V _COMn of the common electrode 214 , and the sensing electrodes 231 are coupled to generate at least one coupling signal V according to the touch driving signals V _{COM of the} common electrodes 214 . _DET1 ... V _DETn , in this embodiment, the plurality of coupling signals V _DET1 ... V _{DETn are} generated by the sensing electrodes 231. At the same time, the control signals 221 are output to the scan signals V _g1 ... V _gn of the switch units 232 , and each switch unit 232 coupled to each control electrode line 233 is driven to be turned on/off sequentially. The sensing electrodes 231 output the coupling signals V _DET1 . . . V _DETn to the corresponding detecting electrode lines 234 via the corresponding switching units 232 for transmission to the signal detecting circuit 222, thereby forming a continuous touch detection signal S _DET ( As shown in FIG. 5B, the touch state of the sensing electrodes 231 is detected, wherein each amplitude of the touch detection signal S _DET is a touch state of each sensing electrode. In addition, the touch circuit 22 is coupled to the display circuit 217 to synchronize the control circuit 221 with the common electrode circuit 218.
Referring to FIGS. 5A and 5B, since each of the sensing electrodes 231 and the common electrode 214 has a common capacitance Ccom, and before the finger or other touch object does not touch the display device 20, the sensing is performed. The electrode 231 does not form a touch capacitor Ctouch with any touch object. Therefore, the coupling signals V _DET1 ... V _DETn received by the signal detecting circuit 222 from the sensing electrodes 231 are regular signals, and are driven by the touch. The signal V _COM is an alternating current signal, and the touch driving signal V _{COM of} the embodiment is represented by a pulse wave, so the touch detection signal S _DET of the signal detecting circuit 222 is a regular alternating current signal. However, when a touch object, such as a finger or a stylus, touches the touch panel 23 of the display device 20, the sensing electrode 231 at the touch position of the touch panel 23 forms a touch with the touch object. The amplitude of the touch detection signal S _DET is irregular. In this embodiment, the plurality of sensing electrodes 231 are touched. Therefore, the amplitude of the complex pulse wave of the touch detection signal S _DET is irregular, and a touch is formed. Control period Ttouch. In addition, in order to avoid false detection of the signal detection circuit 222, the signal detection circuit 222 compares the received coupling signals V _DET1 ... V _DETn according to a threshold value Vth, as shown in FIG. The threshold value Vth is a potential for comparing the amplitude of the touch detection signal S _DET by 0.3V. Therefore, when the amplitude of at least one pulse wave of the touch detection signal S _DET exceeds the threshold value Vth (±0.3 V), the signal detection circuit 222 is based on the amplitude exceeding the threshold value Vth (±0.3 V) and the control circuit 221 The touch positions of the sensing electrodes 231 are obtained by scanning the signals V _g1 ... V _gn .
Please refer to the sixth, seventh and eighth figures, which are partial structural sectional views, circuit diagrams and partial enlarged views of another embodiment of the creation. 6 is a cross-sectional view of a section line CC′ shown in FIG. 8 , and FIG. 8 is an enlarged view of a partial area of the touch panel 33 shown in FIG. 7 , that is, a box shown in FIG. 7 . The difference between the second and sixth figures is that the color filter substrate 215 of the display device 20 of the second figure is disposed above the touch panel 23, and the display device 30 of the sixth figure is provided with a touch panel. 33 is disposed above the color filter substrate 315, that is, the color filter substrate 315 is disposed between the common electrode 314 and the sensing electrodes 331 of the touch panel 33 (refer to FIG. 7). As shown in the figure, the liquid crystal display device 30 of the present invention comprises a display panel 31, a common electrode circuit 318 and a touch circuit 32. The display panel 31 includes an array substrate 311, an array circuit 312, a liquid crystal layer 313, a common electrode 314, a touch panel 33, and a color filter substrate 315. The display panel 31 further includes a three primary color layer 316. The connection relationship between the array substrate 311 and the common electrode 314 and the three primary color layers 316 is the same as that of the array substrate 211 to the common electrode 214 and the three primary color layers 216 of the previous embodiment, and thus will not be described in detail in this embodiment. The color filter substrate 315 is disposed on the three primary color layers 316, and the touch panel 33 is disposed on the color filter substrate 315.
As shown in the seventh embodiment, the touch panel 33 includes a plurality of sensing electrodes 331 , a plurality of switching units 332 , a plurality of control electrode lines 333 and a plurality of detecting electrode lines 334 , and the sensing electrodes 331 , the switching units 332 , the The control electrode lines 333 and the detection electrode lines 334 are disposed above the common electrode 314, and the color filter substrate 315 is disposed between the touch panel 33 and the common electrode 314, thereby allowing the touch panel 33 and the common electrode 314 to be disposed. Form an equivalent capacitance. The control circuit 321 and the signal detection circuit 322 of the touch control circuit 32 of the present embodiment are also coupled to the switch unit 332 via the control electrode line 333 and the detection electrode line 334, respectively, to scan the signals V _g1 ... V by the control circuit 321 . _{The gn} drives the switching unit 332, and receives the coupling signals V _DET1 ... V _DETn from the detecting electrode line 334 via the switching unit 332 for transmission to the signal detecting circuit 322. The remaining operation modes of the touch control circuit 32, the touch panel 33, and the display circuit 317 of the present embodiment are the same as those of the touch control circuit 22, the touch panel 23, and the display circuit 217 of the previous embodiment, and thus will not be further described in this embodiment.
Please refer to the ninth figure, which is a circuit diagram of a display device according to another embodiment of the creation. The difference between the seventh figure and the ninth figure is that the display device 30 of the seventh figure corresponds to all the sensing electrodes 331 of the touch panel 33 and all the corresponding switching units 332 with a single common electrode 314, and the display device 40 of the ninth figure The plurality of common electrodes 414 correspond to all of the sensing electrodes 431 of the touch panel 43 and the switch unit 432. Each of the common electrodes 414 corresponds to a portion of the sensing electrodes 431 and a portion of the switching unit 432. The sensing electrode 431 and the switching unit 432 are respectively associated with each column, but the present invention is not limited thereto, and may correspond to the sensing electrode 431 and the switching unit 432 of each row respectively.
As shown in FIG. 9 , the touch panel 43 of the present display device 40 includes the sensing electrodes 431 , the switching units 432 , the plurality of control electrode lines 433 , and the plurality of detecting electrode lines 434 , and the sensing electrodes 431. The switch unit 432, the control electrode lines 433 and the detection electrode lines 434 are disposed above the common electrode 414, and the color filter substrate 415 is disposed between the touch panel 43 and the common electrode 414. The common electrode circuit of the embodiment is coupled to the common electrodes 414 for outputting the plurality of touch driving signals V _COM1 ... V _COMn for sequentially coupling the sensing electrodes 431 out of the coupling signal V _DET . The control circuit 421 outputs the complex scan signals V _g1 ... V _gn to the switch units 432 to drive the switch units 432 to be respectively turned on, and the signal detection circuit 422 receives the coupled signals V _DET1 ... V _DETn via the detection electrode lines 434.
Referring to the ninth and tenth drawings, the common electrode circuit 418 outputs a pulse wave to the common electrodes 414 according to the timing, which is originally an AC pulse wave, and the common electrode circuit 418 divides the touch driving signal V according to the timing. _COM is a complex pulse wave for output to the common electrodes 414. Since the touch circuit 42 is coupled to the display circuit 417, the control circuit 421 is synchronized with the common electrode circuit 418. Therefore, the control circuit 421 outputs the corresponding pulse wave as the scan signal V _g1 ... V _gn according to the same timing, so that the corresponding coupling After the signals V _DET1 ... V _DETn are received by the signal detecting circuit 422, a continuous AC pulse wave is formed, which is the touch detection signal S _DET . The signal detection circuit 422 obtains the detection mode of the sensing electrode 431 in the same manner as the signal detection circuit 322 of the previous embodiment, which is not described in detail in this embodiment.
The common electrode circuit described above is provided in the display device, and is particularly provided in the display panel. However, the present invention is not limited thereto, and may be provided in an external circuit of the display panel. In addition, as described above, since the touch panel of the present invention is disposed in the display panel, that is, the process of adding the touch panel to the process of the display panel, the display panel and the touch panel are integrated, so The touch panel of the present invention does not need to be provided with a touch substrate, thereby greatly reducing the overall thickness, and simultaneously using the AC pulse outputted by the common electrode circuit as the touch driving signal, so the creation does not need to separately set the touch driving circuit. In order to provide a touch driving signal, the present invention can further reduce the setting of the touch driving circuit, thereby further simplifying the circuit design and reducing the circuit use area.
In summary, the present invention is a liquid crystal display device with a touch circuit, which provides a touch panel disposed in the display panel, thereby reducing the overall thickness, and the AC signal outputted by the common electrode circuit is used as the touch driving signal. It further simplifies circuit design and reduces the use area of touch circuits.
Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application.

10‧‧‧ display device
11‧‧‧ display panel
111‧‧‧Array substrate
112‧‧‧Array circuit
113‧‧‧Liquid layer
114‧‧‧Common electrode
115‧‧‧Three primary color layers
116‧‧‧Color filter substrate
12‧‧‧Touch panel
121‧‧‧Sensor array circuit
122‧‧‧Touch substrate
20‧‧‧Liquid crystal display device
21‧‧‧ display panel
211‧‧‧Array substrate
212‧‧‧Array circuit
213‧‧‧Liquid layer
214‧‧‧Common electrode
215‧‧‧Color filter substrate
216‧‧‧ three primary color layers
217‧‧‧ display circuit
218‧‧‧Common electrode circuit
22‧‧‧Touch circuit
221‧‧‧Control circuit
222‧‧‧Signal detection circuit
23‧‧‧Touch panel
231‧‧‧Sensing electrode
232‧‧‧Switch unit
233‧‧‧Control electrode line
234‧‧‧Detection electrode line
30‧‧‧Liquid crystal display device
31‧‧‧ display panel
311‧‧‧Array substrate
312‧‧‧Array circuit
313‧‧‧Liquid layer
314‧‧‧Common electrode
315‧‧‧Color filter substrate
316‧‧‧ three primary color layers
317‧‧‧Display circuit
318‧‧‧Common electrode circuit
32‧‧‧Touch circuit
321‧‧‧Control circuit
322‧‧‧Signal detection circuit
33‧‧‧Touch panel
331‧‧‧Sensor electrode
332‧‧‧Switch unit
333‧‧‧Control electrode line
334‧‧‧Detection electrode line
40‧‧‧ display device
414‧‧‧Common electrode
415‧‧‧Color filter substrate
417‧‧‧Display circuit
418‧‧‧Common electrode circuit
42‧‧‧Touch circuit
421‧‧‧Control circuit
422‧‧‧Signal detection circuit
43‧‧‧Touch panel
431‧‧‧Sensor electrode
432‧‧‧Switch unit
433‧‧‧Control electrode line
434‧‧‧Detection electrode line
AA'‧‧‧ hatching
B ‧‧‧ box
CC'‧‧‧ hatching
D‧‧‧ box
S _DET ‧‧‧ touch detection signal
Ttouch‧‧‧Touch period
V _COM ‧‧‧ touch drive signal
V _DET ‧‧‧coupled signal
Vg‧‧‧ scan signal
Vth‧‧‧ threshold

The first figure is a schematic structural view of a conventional touch display device;
2 is a cross-sectional view showing a part of a structure of a liquid crystal display device according to an embodiment of the present invention;
The third figure is a circuit diagram of a liquid crystal display device according to an embodiment of the present invention;
The fourth figure is a partially enlarged schematic view of the liquid crystal display device of the third drawing of the creation;
5A is a schematic diagram of an equivalent capacitance of an embodiment of the present invention;
FIG. 5B is a waveform diagram of a touch driving signal and a touch detection signal according to an embodiment of the present invention;
Figure 6 is a partial cross-sectional view showing another embodiment of the creation;
Figure 7 is a circuit diagram of another embodiment of the present invention;
Figure 8 is a partially enlarged schematic view showing the liquid crystal display device of the seventh drawing of the present invention;
FIG. 9 is a circuit diagram of a display device according to another embodiment of the present invention; and FIG. 10 is a waveform diagram of a touch driving signal and a touch detection signal according to another embodiment of the present invention.

20‧‧‧ display device

21‧‧‧ display panel

211‧‧‧Array substrate

212‧‧‧Array circuit

213‧‧‧Liquid layer

214‧‧‧Common electrode

215‧‧‧Color filter substrate

216‧‧‧ three primary color layers

23‧‧‧Touch panel

Claims (12)

A liquid crystal display device with a touch circuit, comprising:
A display panel comprising:
a common electrode;
a touch panel disposed above the common electrode, the touch panel comprising:
a plurality of sensing electrodes disposed above the common electrode, the sensing electrodes being coupled to generate at least one coupling signal according to the common electrode;
a plurality of switching units disposed above the common electrode and corresponding to the common electrode, and coupled to the sensing electrodes;
a plurality of control electrode lines disposed above the common electrode and coupled to the switch units; and a plurality of detection electrode lines disposed above the common electrode and coupled to the switch units;
a common electrode circuit coupled to the common electrode and outputting a touch driving signal to the common electrode to drive the sensing electrodes to couple the common electrode; and a touch circuit coupled to the touch panel The touch circuit includes:
a control circuit coupled to the control electrode lines, the control circuit generates a plurality of scan signals and transmits the control electrode lines to the switch units to drive the switch units to be turned on; and a signal detection circuit coupled A plurality of detection electrode lines are connected, and the signal detection circuit detects the touch state of the sensing electrodes according to a threshold value and the coupling signal. The liquid crystal display device of claim 1, wherein the signal detecting circuit compares the coupled signal according to the threshold value, and when the at least one amplitude of the coupled signal exceeds the threshold, the signal detecting circuit is based on exceeding the threshold The amplitude of the value and the scan signals of the control circuit obtain the touch positions of the sensing electrodes. The liquid crystal display device of claim 1, further comprising:
A color filter substrate is disposed between the common electrode and the sensing electrodes. The liquid crystal display device of claim 1, further comprising:
A color filter substrate is disposed on the sensing electrodes. The liquid crystal display device of claim 1, wherein the common electrode circuit is disposed on a display circuit, and the touch circuit is coupled to the display circuit. A liquid crystal display device with a touch circuit, comprising:
A display panel comprising:
Multiple shared electrodes;
a touch panel disposed above the common electrodes, the touch panel comprising:
a plurality of sensing electrodes disposed above the common electrodes, wherein the common electrodes respectively correspond to a portion of the sensing electrodes, and the sensing electrodes are coupled according to the common electrodes to generate a complex coupling signal;
a plurality of switch units, which are disposed above the common electrodes, the common electrodes respectively corresponding to a portion of the switch units, the switch units being coupled to the sense electrodes;
a plurality of control electrode lines disposed above the common electrodes and coupled to the switch units; and a plurality of detection electrode lines disposed above the common electrodes and coupled to the switch units;
a common electrode circuit coupled to the common electrodes and outputting a plurality of touch driving signals to the common electrodes to drive the sensing electrodes to couple the common electrodes; and a touch circuit coupled to the contacts The control panel, the touch circuit includes:
a control circuit coupled to the control electrode lines, the control circuit generates a plurality of scan signals and transmits the control electrode lines to the switch units to drive the switch units to be turned on; and a signal detection circuit coupled The detection electrode lines are coupled to the switch units, and the signal detection circuit detects the touch states of the sensing electrodes according to a threshold value and the coupling signals. The liquid crystal display device of claim 6, wherein the common electrodes correspond to a portion of the sensing electrodes, and the common electrodes respectively correspond to the sensing electrodes of each column. The liquid crystal display device of claim 6, wherein the common electrodes correspond to a portion of the sensing electrodes, and the common electrodes respectively correspond to the sensing electrodes of each row. The liquid crystal display device of claim 6, wherein the signal detecting circuit compares the coupled signal according to the threshold value, and when the coupled signals exceed the threshold value, the signal detecting circuit is configured to exceed the threshold value. The signals are coupled to obtain touch positions of the sensing electrodes. The liquid crystal display device of claim 6, further comprising:
A color filter substrate is disposed between the common electrodes and the sensing electrodes. The liquid crystal display device of claim 6, further comprising:
A color filter substrate is disposed on the sensing electrodes. The liquid crystal display device of claim 6, wherein the control circuit and the signal detecting circuit are disposed on a touch circuit, the common electrode circuit is disposed on a display circuit, and the touch circuit is coupled to the Display circuit.