CN1982959A - Liquid-crystal display device - Google Patents

Abstract

A liquid crystal display device consists of multiple scan line being set to be parallel to each other and multiple data line being set to be parallel to each other and to be vertically crossed with said scan line. It is featured as forming the first scan line by the first and the second sub-scan lines as well as multiple electric-connection units being electric-connected to two said sub-scan lines.

Description

Liquid crystal display device

【Technical field】

The invention relates to a liquid crystal display device.

【Background technique】

Due to the advantages of light weight, thin thickness, and low power consumption, liquid crystal display devices are widely used in modern information equipment such as televisions, notebook computers, mobile phones, and personal digital assistants.

A prior art liquid crystal display device as shown in Figure 1, the liquid crystal display device 10 includes a plurality of scanning lines 11 parallel to each other, a plurality of data lines 12 parallel to each other and vertically insulated from the scanning lines 11, a plurality of TFT 13, a gate driver (not shown) and a source driver (not shown). The gate driving device is used to provide a scanning voltage to the scanning line 11, the source driving device is used to provide a driving voltage to the data line 12, and the thin film transistor 13 is located at the intersection of the scanning line 11 and the data line 12 place. The gate 131 of the TFT 13 is connected to the scan line 11 , the source 132 is connected to the data line 12 , and the drain 133 is connected to the pixel electrode 15 . The pixel electrode 15 and the common electrode 16 form a capacitor 17 . Each pixel electrode 15 and a common electrode 16 and the liquid crystal molecules sandwiched between them form a pixel unit, and each pixel unit is driven by a thin film transistor 13 .

When the liquid crystal display device 10 displays, the gate driver provides a scanning voltage to drive the gate 131 of the thin film transistor 13 through the scanning line 11, so that the thin film transistor 13 is turned on; at the same time, the source driver provides a driving voltage through the The data line 12, the source 132 and the drain 133 of the thin film transistor 13 are provided to the pixel electrode 15, and a potential difference will be generated between the pixel electrode 15 and the common electrode 16, and the voltage between the pixel electrode 15 and the common electrode 16 The liquid crystal molecules are twisted under the action of the potential difference to control the luminous flux, so as to realize the screen display.

However, the scanning line 11 is generally thinner and longer, so that the internal resistance of the scanning line 11 itself is relatively large. When the scanning voltage flows from one end of the scanning line 11 to the other end, the scanning voltage will produce a voltage drop. When the scanning voltage When the voltage drop is so large that the thin film transistor 13 cannot be turned on normally, the liquid crystal display device 10 cannot display normally, so that the display effect of the liquid crystal display device 10 is poor.

【Content of invention】

In order to solve the problem of poor display effect of the prior art liquid crystal display device, it is necessary to provide a liquid crystal display device with better display effect.

A liquid crystal display device, which includes a plurality of parallel scanning lines and a plurality of data lines parallel to each other and vertically insulated and intersecting with the scanning lines, each scanning line includes a first sub-scanning line and a second sub-scanning line and a plurality of electrical connection parts, the plurality of electrical connection parts are electrically connected to the first sub-scanning line and the second sub-scanning line.

The scanning line of the liquid crystal display device includes a first sub-scanning line and a second sub-scanning line, and the first sub-scanning line and the second sub-scanning line are electrically connected through a plurality of electrical connection parts, so that the internal resistance of the scanning line is relatively low. Small, the voltage drop of the scanning voltage is also small, so that the thin film transistor is normally turned on, and the liquid crystal display device displays normally. Therefore, the liquid crystal display device has a better display effect.

【Description of drawings】

FIG. 1 is a schematic diagram of a liquid crystal display device in the prior art.

FIG. 2 is a schematic structural diagram of the first embodiment of the liquid crystal display device of the present invention.

FIG. 3 is a partially enlarged schematic plan view of the scanning lines of the liquid crystal display device shown in FIG. 2 .

FIG. 4 is a schematic structural diagram of a second embodiment of a liquid crystal display device of the present invention.

5 is a partially enlarged schematic plan view of the scanning lines of the third embodiment of the liquid crystal display device of the present invention.

【Detailed ways】

Please refer to FIG. 2 , which is a schematic diagram of a first embodiment of a liquid crystal display device of the present invention. The liquid crystal display device 20 includes a plurality of scanning lines 21 parallel to each other, a plurality of data lines 22 parallel to each other and vertically insulated and intersecting with the scanning lines 21, a plurality of thin film transistors 23, a gate driving device (not shown) and A source driving device (not shown). The gate driver is used to provide a scan voltage to the scan line 21, the source driver is used to provide a drive voltage to the data line 22, the thin film transistor 23 is located at the intersection of the scan line 21 and the data line 22 place. The gate 231 of the TFT 23 is connected to the scan line 21 , the source 232 is connected to the data line 22 , and the drain 233 is connected to the pixel electrode 25 . The pixel electrode 25 and the common electrode 26 form a capacitor 27 . Each pixel electrode 25 , the common electrode 26 and the liquid crystal molecules sandwiched between them form a pixel unit, and each pixel unit is driven by a thin film transistor 23 .

Please also refer to FIG. 3, which is a partially enlarged plan view of the scanning line shown in FIG. A sub-scanning line 211 is arranged parallel to the second sub-scanning line 212 , and the plurality of electrical connection portions 213 are used to connect the first sub-scanning line 211 and the second sub-scanning line 212 . The distance between two adjacent electrical connection parts 213 of the same scanning line 21 is smaller than the distance between two adjacent data lines 22, especially when it is less than half of the distance between the two adjacent data lines 22, the effect is better. .

When the liquid crystal display device 20 is displaying, the gate driving device provides a scan voltage through the scan line 21 to drive the gate 231 of the thin film transistor 23 to turn on the thin film transistor 23 . The internal resistance of the first sub-scanning line 211 is R ₁ , the internal resistance of the second sub-scanning line 212 is R ₂ , and the internal resistances of the first sub-scanning line 211 and the second sub-scanning line 212 can be equal or not. equal. Then the internal resistance of the first sub-scanning line 211 and the second sub-scanning line 212 connected in parallel R ₀ =R ₁ R ₂ /(R ₁ +R ₂ ), that is, R ₀ <R ₁ , R ₀ <R ₂ ; when When R ₁ =R ₂ , R ₀ =R ₁ /2. Therefore, the internal resistance of the scan line 21 is small, and the voltage drop of the scan voltage is also small, so the thin film transistor 23 can be turned on normally, and at the same time, the source driver provides a driving voltage through the data line 22, the thin film transistor 23 The source 232 and the drain 233 of the pixel electrode 25 are provided to the pixel electrode 25, and a potential difference will be generated between the pixel electrode 25 and the common electrode 26, and the liquid crystal molecules between the pixel electrode 25 and the common electrode 26 are twisted under the action of the potential difference To control the luminous flux, so that the liquid crystal display device 20 can display normally.

Since the scanning line 21 of the liquid crystal display device 20 includes a first sub-scanning line 211 and a second sub-scanning line 212, and the first sub-scanning line 211 and the second sub-scanning line 212 are connected by a plurality of electrical connection parts 213, so that The internal resistance of the scan line 21 is small, and the voltage drop of the scan voltage is also small, so that the thin film transistor 23 is turned on normally, and the liquid crystal display device 20 displays normally. Therefore, the display effect of the liquid crystal display device 20 is better.

In addition, the display defects of the liquid crystal display device 20 caused by the short circuit are easier to repair. When the first sub-scanning line 211 is short-circuited with other circuits due to process defects during manufacture, the short-circuited part of the first sub-scanning line 211 can be cut off by laser cutting, and the normal part of the first sub-scanning line 211 and the second The two sub-scan lines 212 conduct scan signals. This structure enables the display defect of the liquid crystal display device 20 caused by the short circuit to be repaired, thereby making the display effect of the liquid crystal display device 20 better, and improving the manufacturing yield of the liquid crystal display device 20 .

Please refer to FIG. 4 , which is a schematic diagram of a second embodiment of a liquid crystal display device of the present invention. The difference between this embodiment and the first embodiment is that each pixel unit of the liquid crystal display device 30 is driven by two thin film transistors 33, 34, and the gates 331, 341 of the two thin film transistors 33, 34 are connected to the The scan line 31 , the source electrodes 332 , 342 are connected to the data line 32 , and the drain electrodes 333 , 343 are connected to the pixel electrode 35 .

Since each pixel electrode 35 is driven by two thin film transistors 33, 34, when one of the two thin film transistors 33, 34 cannot work normally due to process defects during manufacture, the gate of the damaged thin film transistor can be cut off by laser cutting. The pixel electrode 35 is driven by another normal thin film transistor. This structure can prevent the liquid crystal display device 30 from display defects caused by the damage of the thin film transistor, thereby making the display effect of the liquid crystal display device 30 better, and the structure can improve the manufacturing yield of the liquid crystal display device 30 .

Please refer to FIG. 5 , which is a schematic diagram of a third embodiment of a liquid crystal display device of the present invention. The difference between this embodiment and the first embodiment lies in that the first sub-scanning line 411 and the second sub-scanning line 412 of the scanning line 41 are intersected, and there are multiple intersections. The electrical connection part where the first sub-scanning line 411 and the second sub-scanning line 412 are connected.

In addition, the distance between two adjacent electrical connection parts of the same scan line can also be greater than the distance between two adjacent data lines.

Claims (10)

1. A liquid crystal display device comprising a plurality of parallel scan lines and a plurality of data lines parallel to each other and vertically insulated and intersected with the scan lines, characterized in that each scan line comprises a first sub-scan line, A second sub-scanning line and a plurality of electrical connection parts, the plurality of electrical connection parts are electrically connected to the first sub-scanning line and the second sub-scanning line. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device further comprises a plurality of thin film transistors disposed at the intersections of the scanning lines and the data lines, each thin film transistor having a source, a Gate and drain, the source is connected to the data line, the gate is connected to the scan line. 3. The liquid crystal display device according to claim 2, characterized in that: the liquid crystal display device further comprises a plurality of pixel electrodes and a plurality of common electrodes, each pixel electrode and the common electrodes and the liquid crystal molecules clamped by the two constitute a A pixel unit, the pixel electrode is connected to the drain of the thin film transistor. 4. The liquid crystal display device as claimed in claim 3, wherein each pixel unit is driven by a thin film transistor. 5. The liquid crystal display device as claimed in claim 3, wherein each pixel unit is driven by two thin film transistors, and the drains of the two thin film transistors are connected to a pixel electrode. 6. The liquid crystal display device as claimed in claim 1, wherein the first sub-scanning line and the second sub-scanning line are parallel to each other. 7. The liquid crystal display device as claimed in claim 1, wherein the first sub-scanning line and the second sub-scanning line are intersected. 8. The liquid crystal display device as claimed in claim 1, wherein the internal resistance of the first sub-scanning line is equal to the internal resistance of the second sub-scanning line. 9. The liquid crystal display device according to claim 1, wherein the distance between two adjacent electrical connection parts is smaller than the distance between two adjacent data lines. 10. The liquid crystal display device according to claim 1, wherein the distance between two adjacent electrical connection parts is less than half of the distance between two adjacent data lines.

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