TWI566230B - Multifunctional signal generator - Google Patents

Description

Multi-function signal generator

The present invention relates to a multi-function signal generator, and more particularly to a multi-function signal generator for a touch display device.

In recent years, with the rapid development and application of technology, in order to achieve the convenience of carrying, the volume is light, and the like, the panel in the conventional touch display device gradually has an in-cell type of touch and display functions (In-cell). ) Touch display panel to develop.

However, the conventional touch display device mainly drives the touch and display functions of the in-cell touch display panel by a touch signal generator and a source drive signal generator, respectively. The circuit structure of the conventional touch display device is complicated and the manufacturing cost is high.

Accordingly, it is an object of the present invention to provide a multi-function signal generator that allows a touch display device to have a relatively simple circuit structure and a low manufacturing cost.

Therefore, the multi-function signal generator of the present invention is used for a touch display unit having a touch panel and a display panel, and can generate a first driving signal output and a periodic second driving signal output. In one of the following, when the first driving signal output is generated, the display panel is activated according to the first driving signal output, and when the periodic second driving signal output is generated, the touch panel is driven according to the periodic second driving. The signal output is activated. The multi-function signal generator comprises a delay unit, a control circuit, a digital analog conversion circuit, a multiplex circuit, an output circuit and first and second switches.

The delay unit is configured to receive a plurality of series of pixel data signals, and generate a plurality of delayed pixel data signals respectively corresponding to the pixel data signals according to the pixel data signals.

The control circuit is configured to generate a periodic digital signal, a first control signal, and a second control signal, and the first control signal is complementary to the second control signal, and each of the first and second control signals The person has a high logic level and a low logic level.

The multiplex circuit is electrically connected between the delay unit and the control circuit and the digital analog conversion circuit, and the multiplex circuit can allow the delayed pixel data when the first control signal is at the high logic level Transmitting a signal from the delay unit to the digital analog conversion circuit, so that the digital analog conversion circuit generates a plurality of analog data signals according to the delayed pixel data signals, and when the second control signal is at the high logic level, The multiplex circuit can allow the periodic digital signal to be transmitted from the control circuit to the digital analog conversion circuit such that the digital analog conversion circuit generates a periodic analog signal based on the periodic digital signal.

The output circuit is electrically connected to the digital analog conversion circuit, and when the first control signal is at the high logic level, the output circuit receives the analog data signals from the digital analog conversion circuit, and according to the analog data signals Generating a plurality of analog output signals, the analog output signals are output as the first driving signal, and the output circuit receives the periodicity from the digital analog conversion circuit when the second control signal is at the high logic level Analogizing the signal and generating the periodic second drive signal output based on the periodic analog signal.

The first and second switches are electrically connected between the output circuit and the display panel, and between the output circuit and the touch panel, and are respectively controlled by the first and second control signals to be turned on. Switch between not conducting.

Referring to FIG. 1 , an embodiment of the touch display device 10 of the present invention includes a multi-function signal generator 1 and a touch display unit 2 . The touch display unit 2 has a touch panel 21 and a display panel 22 combined. In this embodiment, the touch panel 21 and the display panel 22 are attached together, but are not limited thereto. In other embodiments, the touch panel 21 and the display panel 22 can be integrated. The multi-function signal generator 1 includes a delay unit 11, a control circuit 12, a digital analog conversion circuit 13, a multiplex circuit 14, an output circuit 15, and first and second switches 16, 17.

The delay unit 11 is configured to receive a plurality of consecutive pixel data signals, and generate a plurality of delayed pixel data signals respectively corresponding to the pixel data signals according to the pixel data signals. In this embodiment, the delay unit 11 includes a timing control circuit 111, a shift temporary storage circuit 112, and a data latch circuit 113.

The timing control circuit 111 is configured to generate a first enable signal En1 and a second enable signal En2.

The shift register circuit 112 is electrically connected to the timing control circuit 111 to receive the first enable signal En1, and sequentially receives and stores a current pixel data signal during each period of the first enable signal En1. And outputting a previously stored pixel data signal, and the current pixel data signal and the previously stored pixel data signal are combined into the pixel data signals.

The data latch circuit 113 is electrically connected to the shift register circuit 112 and the timing control circuit 111, and receives the second enable signal En2 from the timing control circuit 111, and each of the second enable signals En2 The previously stored pixel data signals from the shift register circuit 112 are sequentially received and stored during the period, and the delayed pixel data signals are generated accordingly.

The control circuit 12 is configured to generate a periodic digital signal, a first control signal C1 and a second control signal C2. In this embodiment, the periodic digital signal is one of a sine wave signal, a triangular wave signal, and a square wave signal, but is not limited thereto. The first control signal C1 is complementary to the second control signal C2, and each of the first and second control signals C1, C2 has a high logic level and a low logic level.

The multiplex circuit 14 is electrically connected between the delay unit 11 and the control circuit 12 and the digital analog conversion circuit 13. The output circuit 15 is electrically connected to the digital analog conversion circuit 13. The first switch 16 is electrically connected between the output circuit 15 and the display panel 22, and is controlled by the first control signal C1 to switch between conduction and non-conduction. The second switch 17 is electrically connected between the touch panel 21 of the output circuit 15 and controlled by the second control signal C2 to switch between conduction and non-conduction.

In detail, in operation, when the first control signal C1 is at the high logic level, the second control signal C2 is located at the low logic level, and the first switch 16 is controlled by the first control signal C1. Turning on, and the second switch 17 is controlled by the second control signal C2 and is not turned on.

At this time, the multiplex circuit 14 can allow the delayed pixel data signals to be transmitted from the delay unit 11 to the digital analog conversion circuit 13, so that the digital analog conversion circuit 13 generates a plurality of analog codes according to the delayed pixel data signals. Data signal. Then, the output circuit 15 receives the analog data signals from the digital analog conversion circuit 13, and respectively generates a plurality of analog output signals according to the analog data signals, and the analog output signals are output as a first driving signal. Finally, the display panel 22 is activated in accordance with the first drive signal output to facilitate display of the image.

When the first control signal C1 is at the low logic level, the second control signal C2 is located at the high logic level, the first switch 16 is controlled by the first control signal C1 and is not turned on, and the second The switch 17 is turned on by the second control signal C2.

At this time, the multiplex circuit 14 can allow the periodic digital signal to be transmitted from the control circuit 12 to the digital analog conversion circuit 13, so that the digital analog conversion circuit 13 generates a periodic analog signal based on the periodic digital signal. Then, the output circuit 15 receives the periodic analog signal from the digital analog conversion circuit 13, and generates a periodic second drive signal output according to the periodic analog signal. Finally, the touch panel 21 is activated according to the periodic second driving signal output to facilitate touch detection.

In summary, the multi-function signal generator 1 can generate the first and second driving signal outputs to respectively drive the display panel 22 and the touch panel 21, so the touch display device 10 of the present invention does not need to be For example, a touch display device needs to have both a touch signal generator and a source drive signal generator. Therefore, the touch display device 10 of the present invention has a simpler circuit structure than the conventional touch display device, and can save the circuit while reducing the manufacturing cost.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

10‧‧‧Touch display device
1‧‧‧Multi-function signal generator
11‧‧‧Delay unit
111‧‧‧Sequence Control Circuit
112‧‧‧Shift register circuit
113‧‧‧ Data latching circuit
12‧‧‧Control circuit
13‧‧‧Digital analog conversion circuit
14‧‧‧Multiplex circuit
15‧‧‧Output circuit
16‧‧‧First switch
17‧‧‧Second switch
2‧‧‧Touch display unit
21‧‧‧ touch panel
22‧‧‧ display panel
En1‧‧‧first enable signal
En2‧‧‧Secondary signal
C1‧‧‧ First control signal
C2‧‧‧second control signal

Other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a circuit block diagram illustrating an embodiment of the touch display device of the present invention.

10‧‧‧Touch display device

1‧‧‧Multi-function signal generator

11‧‧‧Delay unit

111‧‧‧Sequence Control Circuit

112‧‧‧Shift register circuit

113‧‧‧ Data latching circuit

12‧‧‧Control circuit

13‧‧‧Digital analog conversion circuit

14‧‧‧Multiplex circuit

15‧‧‧Output circuit

16‧‧‧First switch

17‧‧‧Second switch

2‧‧‧Touch display unit

21‧‧‧ touch panel

22‧‧‧ display panel

En1‧‧‧first enable signal

En2‧‧‧Secondary signal

C1‧‧‧ first control signal

C2‧‧‧second control signal

Claims (4)

A multi-function signal generator for a touch display unit having a combination of a touch panel and a display panel, and capable of generating one of a first driving signal output and a periodic second driving signal output When the first driving signal output is generated, the display panel is activated according to the first driving signal output. When the periodic second driving signal output is generated, the touch panel outputs the second driving signal according to the periodicity. Starting, the multi-function signal generator comprises: a delay unit, configured to receive a plurality of series of pixel data signals, and generate a plurality of delayed pixel data corresponding to the pixel data signals according to the pixel data signals a control circuit for generating a periodic digital signal, a first control signal, and a second control signal, and the first control signal is complementary to the second control signal, the first and second control signals Each of which has a high logic level and a low logic level; a digital analog conversion circuit; a multiplex circuit electrically connected to the delay unit and the control And between the digital analog conversion circuit, and when the first control signal is at the high logic level, the multiplex circuit can allow the delayed pixel data signals to be transmitted from the delay unit to the digital analog conversion circuit, Therefore, the digital analog conversion circuit respectively generates a plurality of analog data signals according to the delayed pixel data signals, and when the second control signal is located at the high logic level, the multiplexing circuit can allow the periodic digital signals to be from the Control circuit transmission to The digital analog conversion circuit, such that the digital analog conversion circuit generates a periodic analog signal according to the periodic digital signal; an output circuit electrically connecting the digital analog conversion circuit, and when the first control signal is at the high logic level The output circuit receives the analog data signals from the digital analog conversion circuit, and generates a plurality of analog output signals according to the analog data signals, and the analog output signals are output as the first driving signal, and when When the second control signal is at the high logic level, the output circuit receives the periodic analog signal from the digital analog conversion circuit, and generates the periodic second driving signal output according to the periodic analog signal; and a first The switch and a second switch are electrically connected between the output circuit and the display panel and between the output circuit and the touch panel, respectively, and are respectively controlled by the first and second control signals to be turned on and Switch between non-conductions. The multi-function signal generator of claim 1, wherein the delay unit comprises: a timing control circuit for generating a first enable signal and a second enable signal. The multi-function signal generator of claim 2, wherein the delay unit further comprises: a shift register circuit electrically connected to the timing control circuit to receive the first enable signal, and the first enable Receiving and storing a current pixel data signal sequentially during each cycle of the signal, and outputting a previously stored picture The prime data signal, the current pixel data signal and the previously stored pixel data signal are combined into the pixel data signals. The multi-function signal generator of claim 3, wherein the delay unit further comprises: a data latch circuit electrically connected to the shift register circuit and the timing control circuit to receive the first stage from the timing control circuit a second enable signal, and sequentially receiving and storing the previously stored pixel data signal from the shift register circuit during each period of the second enable signal, and generating the delayed pixel data accordingly signal.