TWI507933B - Liquid crystal display touch panel - Google Patents

Description

Touch LCD panel

The invention relates to a touch type liquid crystal display panel.

In today's information age, human dependence on electronic products is increasing. Electronic products such as notebook computers, mobile phones, personal digital assistants (PDAs), and digital walkmans have become indispensable tools for modern people's lives and work. Generally, electronic devices sold in the market, in order to facilitate the user's operation, a human-machine interface is designed to provide a user input command and enable the electronic device to perform various functions. In order to achieve more convenient carrying, lighter weight and more user-friendly operation, in recent years, touch-type liquid crystal display panels have been widely used in various electronic products, such as: Global Positioning System (GPS). Instead of traditional input devices (such as keyboards and mice), personal digital assistants, cellular phones, and handheld computers (Hand-held PCs). Among them, the combination of the display function and the touch function can make the design of the human-machine interface more convenient.

In general, the liquid crystal display panel and the touch panel in the conventional touch-type liquid crystal display panel are separated by themselves, and each has its own control chip dedicated to its function. Therefore, the micro controller unit (MCU) of the back end needs to have two sets of interfaces to communicate with the liquid crystal display panel and the touch panel at the same time. As a result, the touch-type liquid crystal display panel requires more wiring in design, and the communication protocol and processing program become more complicated. Complex and high production costs.

The invention provides a touch type liquid crystal display panel, which can simplify the communication interface and reduce the production cost.

The present invention provides a touch-sensitive liquid crystal display panel having a plurality of display units and a plurality of touch units. The touch-sensitive liquid crystal display panel includes a glass substrate and an integrated wafer. The integrated chip includes a display driving circuit and a touch detecting unit. The display driving circuit is coupled to the display unit, receives a display data and a setting data, and drives the display unit according to the setting data and the display data. The touch detection unit is coupled to the touch unit, detects a touch action of the user according to the setting data, and outputs a touch signal according to the touch action of the user.

In one embodiment of the present invention, the touch-control liquid crystal display panel further includes a micro control unit coupled to the integrated chip, transmitting display data and setting data to the integrated chip, and receiving the touch signal according to the touch signal. Determine the position where the liquid crystal display panel is touched.

In one embodiment of the present invention, the integrated chip further includes a communication interface coupled to the display driving circuit, the touch detecting unit and the micro control unit for transmitting the setting data to the display driving circuit or the touch The detection unit is controlled, and the touch detection unit outputs a touch signal to transmit the touch signal to the micro control unit, and transmits the display data to the display driving circuit.

In an embodiment of the invention, the communication interface is an internal integrated circuit transmission interface.

In an embodiment of the invention, the communication interface is a serial peripheral interface.

In an embodiment of the invention, the integrated wafer is directly disposed on the glass substrate by wafer-to-glass bonding.

In one embodiment of the present invention, the display driving circuit and the touch detecting unit are respectively connected to the display unit and the touch unit through indium tin oxide.

Based on the above, the present invention integrates the integrated wafer between the liquid crystal display panel and the touch panel into an integrated chip to simplify the production mode and communication interface of the touch liquid crystal display panel, thereby reducing the production cost. .

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a schematic diagram of a touch liquid crystal display panel according to an embodiment of the invention. Referring to FIG. 1 , the touch-control liquid crystal display panel 100 has at least one display unit P1 (in the present embodiment, a plurality of display units P1 ) and a plurality of touch units T1 . The display unit P1 is configured to display a picture according to a display data, and the touch unit T1 can provide a touch action, for example, when the touch-type liquid crystal display panel 100 is a resistive touch or a capacitive touch. When the panel is used, the touch action can be completed by pressing or touching. The touch liquid crystal display panel 100 includes a glass substrate 102, an integrated wafer 104, and a micro control unit 106. Where the integrated wafer 104 is wafer-to-glass bonded The method of (Chip On Glass, COG) is directly disposed on the glass substrate 102 in the liquid crystal display panel 100.

The integrated chip 104 receives the setting data S1 and the display data D1 from the micro control unit 106, and determines whether the setting data S1 is a touch setting data or a display setting data. When it is judged that the setting data S1 is the display setting data, the integrated wafer 104 performs the display operation of the display material D1 in accordance with the setting of the display setting data. For example, if the display unit P1 of the embodiment is a seven-segment display, the display data D1 may be a number to be displayed by the display unit P1, and the setting data S1 may set the brightness or control of the display unit P1 when displaying a number. The display unit displays the numbers in a blinking manner. For example, when the touch-type liquid crystal display panel 100 is used to display the temperature of the temperature measurement, it can be set to increase the brightness of the displayed digital number and start to blink when the temperature of the target measurement object rises or falls beyond the critical temperature to attract User's attention.

It should be noted that the display unit P1 is not limited to the seven-segment display in this embodiment. In other embodiments, the display unit P1 can also be used in a liquid crystal display panel generally used in a computer or a television screen. Pixel unit. In addition, the display data D1 of the embodiment is not limited to being transmitted by the micro control unit 106. In other embodiments, the display data D1 may also be provided by other devices, such as a memory.

When the setting data S1 is the touch setting data for setting the detecting action of the touch unit T1, the integrated chip 104 detects the state of the touch unit T1 according to the setting of the setting data. For example, the touch unit T1 can be scanned according to the scan frequency set by the touch setting data to detect the touch unit. The state of T1. When the touch-type liquid crystal display panel 100 is a resistive touch panel, the touch action of the user can be detected according to the change of the resistance value of the touch unit T1, and when the touch-type liquid crystal display panel 100 is a capacitor The touch panel can also detect the touch action of the user according to the change of the capacitance value of the touch unit T1. After the integrated chip 104 detects the touch action of the user, the integrated chip 104 outputs a touch signal ST to the micro control unit 106 according to the detected touch action of the user, so that the micro control unit 106 is based on The touch signal ST determines a position at which the touch liquid crystal display panel 100 is touched.

By integrating the control wafers of the conventional liquid crystal display panel and the touch panel into an integrated wafer 104, the display unit P1 on the liquid crystal display panel 100 is driven according to the display data D1 and the display setting data, and is set according to the touch. The data detects the touch action of the user to output a touch signal ST according to the touch action. Therefore, the work of the traditional micro-control unit 106 can be distributed to the integrated chip 104 to reduce the design difficulty of the micro-control unit 106, and the number of wires required by the micro-control unit 106 can be reduced, and the touch-type liquid crystal display panel 100 can be simplified. The communication protocol and the production process further reduce the production cost of the touch liquid crystal display panel 100.

In detail, the integrated wafer 104 of the embodiment of FIG. 1 can be as shown in FIG. 2, and FIG. 2 is a schematic diagram of a touch-type liquid crystal display panel according to another embodiment of the present invention. The touch-sensitive liquid crystal display panel 200 of the present embodiment is different from the touch-control liquid crystal display panel 100 of the embodiment of FIG. 1 in that the integrated chip 104 includes a display driving circuit 202, a touch detecting unit 204, and a communication interface 206. The communication interface 206 can be, for example, an internal integrated circuit transmission. An Inter-Integrated Circuit (I2C) interface, a Serial Peripheral Interface (SPI), or other serial or parallel communication interface coupled to the display driving circuit 202 and the touch detection unit 204. The display driving circuit 202 and the touch detecting unit 204 are respectively connected to the display unit P1 and the touch unit T1 through indium tin oxide.

The communication interface 206 is configured to receive the setting data S1 and the display data D1 from the micro control unit 106, and transmit the setting data S1 to the touch detection unit 204 or the display driving circuit 202. Here, the communication interface 206 transmits the setting data S1 to the touch detection unit 204 or the display driving circuit 202 based on the setting target to be set by the data S1. For example, the setting data S1 may include one or more specific bits to indicate that the setting data S1 is setting data for the touch or display function. When the communication interface 206 decodes the received setting data S1, the setting information S1 can be determined by the specific bit to be the touch setting data or the display setting data.

When the setting data S1 is the touch setting data, the communication interface 206 transmits the decoded touch setting data to the touch detecting unit 204, so as to control the touch detecting unit 204 to detect the user according to the touch setting data. The touch detection unit 204 outputs the touch signal ST to the communication interface 206 according to the touch action after detecting the touch action of the user. Then, the communication interface 206 then transmits the touch signal ST to the micro control unit 106, so that the micro control unit 106 can determine the position where the touch liquid crystal display panel 100 is touched according to the touch signal ST.

In addition, when the setting data S1 is the display setting data, the communication interface 206 transmits the display data D1 and the decoded display setting data to the display driving circuit 202, so that the display driving circuit 202 can drive the display unit P1 according to the decoded display data D1 and the display setting data. Thus, by integrating the wafer 104 to share the traditional medium micro control unit 106 to simultaneously communicate with the touch detection unit 204 and the display driving circuit 202, the wiring on the micro control unit 106 can be greatly reduced, and the micro control unit 106 can be reduced. The complexity of the design simplifies the communication protocol and the production process of the touch-type liquid crystal display panel 100, thereby reducing the production cost of the touch-type liquid crystal display panel 100.

In summary, the present invention integrates a control chip between a liquid crystal display panel and a touch panel into an integrated chip in a conventional touch-type liquid crystal display panel, and uses the integrated chip to drive the touch type according to the setting data and the display data. The display unit of the liquid crystal display panel detects the touch action of the user at the same time. In this way, the wiring on the micro control unit can be reduced, the design complexity of the micro control unit circuit can be reduced, the communication protocol and the production process of the touch liquid crystal display panel can be simplified, and the production cost of the touch liquid crystal display panel can be reduced.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100,200‧‧‧Touch LCD panel

102‧‧‧ glass substrate

104‧‧‧Integrated wafer

106‧‧‧Micro Control Unit

202‧‧‧Display drive circuit

204‧‧‧Touch detection unit

206‧‧‧Communication interface

P1‧‧‧ display unit

T1‧‧‧ touch unit

D1‧‧‧ Display information

S1‧‧‧Setting information

ST‧‧‧ touch signal

1 is a schematic view of a touch-control liquid crystal display panel according to an embodiment of the invention Figure.

2 is a schematic diagram of a touch-type liquid crystal display panel according to another embodiment of the present invention.

100‧‧‧Touch LCD panel

102‧‧‧ glass substrate

104‧‧‧Integrated wafer

106‧‧‧Micro Control Unit

P1‧‧‧ display unit

T1‧‧‧ touch unit

D1‧‧‧ Display information

S1‧‧‧Setting information

ST‧‧‧ touch signal

Claims (6)

The touch-sensing liquid crystal display panel has at least one display unit and a plurality of touch units, wherein the touch-control liquid crystal display panels comprise: a glass substrate; a micro control unit that outputs a display data and a setting data; and an integrated chip, comprising: a display driving circuit coupled to the display unit, driving the display unit according to the setting data and the display data; and a touch detection The unit is coupled to the touch unit, and detects the touch action of the user according to the setting data, and outputs a touch signal according to the touch action; and a communication interface coupled to the display drive circuit and the touch The control unit and the micro control unit receive the display data and the setting data, determine the setting data as display setting data or touch setting data, and transmit the data to the display driving circuit or the touch detecting unit. Controlling the touch detection unit to output the touch signal to the micro control unit or transmitting the display data to the display driving circuit. The touch control liquid crystal display panel of claim 1, wherein the micro control unit further determines a position at which the touch liquid crystal display panel is touched according to the touch signal. The touch-control liquid crystal display panel of claim 1, wherein the communication interface is an internal integrated circuit transmission interface. The touch-sensitive liquid crystal display panel of claim 1, wherein the communication interface is a serial peripheral interface. The touch-control liquid crystal display panel of claim 1, wherein the integrated wafer is directly disposed on the glass substrate by wafer-to-glass bonding. The touch-sensitive liquid crystal display panel of claim 1, wherein the display driving circuit and the touch detecting unit are respectively connected to the display units and the touch units through indium tin oxide.