Liquid crystal display panel, driving circuit and manufacturing method of the same

Patent metadata

Field	Value
Publication number	US-10324344-B2
Application number	US-201816231633-A
Country	US
Kind code	B2
Filing date	Dec 24, 2018
Priority date	Sep 8, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A liquid crystal display panel and its driving circuit, manufacturing method are disclosed. The driving circuit has a first switching element. The first terminal of the first switching element is connected to one data line of the liquid crystal display panel. At the array manufacturing process stage, the control terminal of the first switching element is input a first reference voltage. The second terminal of the first switching element is connected to a first discharge circuit. During the stage to drive the liquid crystal display panel to display or to test the liquid crystal display panel, the control terminal of the first switching element is input a first control signal. The second terminal of the first switching element is input a data signal. By the aforementioned ways, it can simultaneously achieve an ESD protection and to save the panel space to be favorable for narrow frame design.

First claim

What is claimed is:

1. A manufacturing method of an LCD panel comprising steps of:
forming a driving circuit of the LCD panel, wherein the driving circuit comprises multiple first switching circuits; each first switching circuit has a first switching element; the first switching element has a control terminal, a first terminal and a second terminal; the first terminal of the first switching element is connected to one data line of the LCD panel;
at an array manufacturing process stage of the LCD panel, inputting a first reference voltage into the control terminal of the first switching element; connecting the second terminal of the first switching element to a first discharge circuit to discharge the voltage of the data line through the first discharge circuit when the voltage of the data line is higher than or lower than the first reference voltage and the first switching element is turned on; and
after the array manufacturing process stage, processing the stage to drive the LCD panel to display or to test the LCD panel to disconnect the second terminal of the first switching element and the first discharge circuit; inputting a first control signal to the control terminal of the first switching element; inputting a data signal to the second terminal of the first switching element to transmitting the data signal through said first switching element to the data line when the first control signal controls the first switching element to be turned on and to achieve the LCD panel to display or to be tested.

2. The manufacturing method according to claim 1 , wherein forming the driving circuit of the LCD panel further comprises steps of:
forming the driving circuit of the LCD panel, wherein the driving circuit has multiple second switching elements; the second switching element has a control terminal, a first terminal and a second terminal; the first terminals of the first switching element and the second switching element are connected to the same data line of the LCD panel;
at the array manufacturing process stage of the LCD panel further comprises steps of: inputting a second reference voltage to the control terminal of the second switching element; connecting the second terminal of the second switching element to a second discharge circuit to discharge the voltage of the data line through the second discharge circuit when the voltage of the data line is higher than the second reference voltage and the second switching element is turned on, wherein when the voltage of the data line is lower than the first reference voltage, the first switching element is turned on; and
after the array manufacturing process stage, at the stage to drive the LCD panel to display or to test the LCD panel further comprises steps of: disconnecting the first switching element and the second switching element respectively to the first discharge circuit and the second discharge circuit; inputting a first control signal to the control terminal of at least one of the first switching element and the second switching element, and inputting a data signal to the second terminal of at least one of the first switching element and the second switching element to achieve the LCD panel to display.

3. The manufacturing method according to claim 2 , wherein forming the driving circuit of the LCD panel further comprises steps of:
forming the driving circuit of the LCD panel, wherein the driving circuit further has multiple second switching circuits; each second switching circuit has a third switching element and a fourth switching element; each second switching circuit corresponds to at least two of the first switching circuits; the second terminals of the first switching element of the at least two of the first switching circuits are connected to the first discharge circuit or to receive the data signal through the third switching element; the second terminals of the second switching element of the at least two of the first switching circuits are connected to the second discharge circuit or to receive the data signal through the fourth switching element; the third switching element and fourth switching element respectively have a control terminal, a first terminal and a second terminal; the first terminal of the third switching element is connected to the second terminals of the first switching elements of the corresponding at least two of the first switching circuits; the first terminal of the fourth switching element is connected to the second terminals of the second switching elements of the corresponding at least two of the first switching circuits;
at the array manufacturing process stage of the LCD panel further comprises steps of: respectively inputting the first reference voltage and the second reference voltage to the control terminals of the third switching element and the fourth switching element; respectively connecting the first terminals of the third switching element and the fourth switching element to the first discharge circuit and the second discharge circuit; when the voltage of the data line connected by one of the corresponding first switching circuits is lower than the first reference voltage, the third switching element is turned on to discharge the voltage of the data line connected by the one of the corresponding first switching circuits through the first discharge circuit; when the voltage of the data line connected by one of the corresponding first switching circuits is higher than the second reference voltage, the fourth switching element is turned on to discharge the voltage of the data line connected by one of the corresponding first switching circuits through the second discharge circuit; and
after the array manufacturing process stage, at the stage to drive the LCD panel to display or to test the LCD panel further comprises steps of: inputting a second control signal to the control terminal of at least one of the third switching element and the fourth switching element, and inputting the data signal to the second terminal of at least one of the third switching element and the fourth switching element; the data signal is input to the second terminal of at least one of the first switching element and the second switching element of the at least two of the first switching circuits.

4. The manufacturing method according to claim 3 , wherein the first reference voltage and the second voltage are ground voltage; the first discharge circuit and the second discharge circuit are short-circuit lines connected to the ground;
wherein at the array manufacturing process stage of the LCD panel further comprises steps of: connecting all the control terminals of the first switching elements, the second switching elements, the third switching elements and the fourth switching elements to the short-circuit lines; the first terminals of the third switching element and the fourth switching element of each second switching circuit are connected to the second terminals of the first switching elements and the second switching elements of the corresponding at least two of the first switching circuits; and
after the array manufacturing process stage, at the stage to drive the LCD panel to display or to test the LCD panel further comprises steps of: the short-circuit lines are cut; then the first control signal is input to the control terminal of at least one of the first switching element and the second switching element of each first switching circuit; the second control signal is input to the control terminal of at least one of the third switching element and the fourth switching element of each second switching circuit; the data signal is input to the second terminal of at least one of the third switching element and the fourth switching element of each second switching circuit.

5. The manufacturing method according to claim 4 , wherein the first switching el

Assignees

• Shenzhen China Star Optoelect
• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Wang Cong
• Du Peng

Classifications

• G02F2202/104

  poly-Si · CPC title

• G02F1/13452

  Conductors connecting driver circuitry and terminals of panels · CPC title

• G02F2201/503

  Arrangements improving the resistance to shock · CPC title

• G09G3/3648 Primary

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title