TWI651707B - Data driving module and liquid crystal display apparatus using the same - Google Patents

Abstract

A liquid crystal display device includes a display panel, a timing control module, a voltage generation module, and a data driving module. The display panel includes m scanning lines, n data lines vertically intersecting the scanning lines, and m*n pixel units in the scanning lines and the data lines. The timing control module outputs data control signals and image signals to the data driving module. The voltage generation module outputs a first reference voltage that is within a first voltage range. The data driving module obtains a second reference voltage corresponding to the pixel unit and converts it into a driving voltage and outputs the data to the pixel unit in the display panel through the data line. The first voltage range is divided into 2 ⁿ first reference voltages, and the data driving module divides the voltage in the second voltage range into 2 ⁿ⁺¹ second reference voltages. The invention also provides a data driving module.

Description

Data driving module and liquid crystal display device with data driving module

The invention relates to a data driving module and a liquid crystal display device with a data driving module.

Liquid crystal display (LCD) is a flat-panel display widely used at present, which has the advantages of slim shape, power saving and no radiation. The liquid crystal display includes a display panel for displaying an image, a backlight module for providing backlight to the display panel, and a driving circuit for driving the display panel. The display panel includes a scan line, a data line interlaced with the scan line, and a pixel unit disposed at a intersection of the scan line and the data line. The driving circuit includes a digital to analog converter (DAC). The digital analog converter outputs a predetermined driving voltage to the pixel unit through the data line. The pixel unit is charged according to the received driving voltage. Due to the voltage drop on the data line, the charging time of the pixel unit is insufficient, resulting in the inconsistency of the brightness of the liquid crystal display, resulting in poor uniformity of the liquid crystal display (Image Uniformity), which affects the image display quality.

In view of the above, it is necessary to provide a liquid crystal display device having better display quality.

In addition, it is necessary to provide a data driving module with better display quality.

A liquid crystal display device includes a display panel, a timing control module, a voltage generation module, and a data driving module. The display panel includes m scanning lines, n data lines vertically intersecting the scanning lines, and m*n pixel units in the scanning lines and the data lines. Where m and n are natural numbers. The timing control module is configured to output data control signals and image signals to the data driving module. The voltage generation module outputs a first reference voltage that is within a first voltage range. The data driving module adjusts the first voltage range to the second voltage range and divides to form a plurality of second reference voltages, and obtains a second reference voltage located in the second voltage range according to the position of the pixel unit, and the first The two reference voltages are converted into driving voltages and output to the pixel units in the display panel through the data lines. The second reference voltage in the second voltage range is greater than the first reference voltage in the first voltage range; the first voltage range is divided into 2 ⁿ first reference voltages, and the data driving module is second The voltage within the voltage range is divided into 2 ⁿ⁺¹ second reference voltages.

A data driving module receives a data control signal, an image signal and a first reference voltage and converts and outputs a driving voltage to a pixel unit in the display panel. The data driving module adjusts the first voltage range to the second voltage range and divides to form a plurality of second reference voltages, obtains the second reference voltage according to the position of the pixel unit, and converts the second reference voltage into a driving voltage and outputs the display voltage to the display. a pixel unit in the panel; wherein, the number of the second reference voltage in the second voltage range is greater than the number of the first reference voltage in the first voltage range; the first voltage range is divided into 2 ⁿ first reference voltages, The data driving module divides the voltage in the second voltage range into 2 ⁿ⁺¹ second reference voltages.

In the above liquid crystal display device, the liquid crystal display device outputs a driving voltage to the pixel unit according to the adjustment of the position of the pixel unit by the data driving module, thereby increasing the charging speed of the pixel unit, and simultaneously increasing the driving voltage of the pixel unit. The problem of poor image uniformity (Image Uniformity) due to the manufacturing process of the liquid crystal display device can be improved, thereby improving the image display quality.

100,300‧‧‧Liquid crystal display device

10‧‧‧ display panel

G1~Gm‧‧‧ scan line

D1~Dn‧‧‧ data line

12‧‧‧ pixel unit

14‧‧‧ gate drive unit

16‧‧‧Common voltage supply unit

20‧‧‧Sequence Control Module

40‧‧‧Voltage generation module

60,80‧‧‧Data Drive Module

61‧‧‧Processing unit

62‧‧‧Search unit

82‧‧‧ arithmetic unit

64,84‧‧‧Digital Analog Conversion Unit

1 is a block diagram of a liquid crystal display device of a first embodiment.

2 is a schematic block diagram showing the planar structure of the display panel shown in FIG. 1.

3 is a block diagram of a liquid crystal display device of a second embodiment.

Please refer to FIG. 1 , which is a block diagram of a liquid crystal display device 100 of a preferred embodiment. The liquid crystal display device 100 is for displaying an image.

The liquid crystal display device 100 includes a display panel 10, a timing control module 20, a voltage generation module 40, and a data driving module 60. It can be understood that the liquid crystal display device 100 may further include a touch module for recognizing a touch operation, a backlight module for providing backlight to the display panel 10, and a cover lens.

Referring to FIG. 2, the display panel 10 includes a plurality of mutually parallel and insulated scanning lines G1 G Gm, and a plurality of parallel and insulated data lines D1 D Dn. The complex scan lines G1 G Gm are vertically insulated from the complex data lines D1 D Dn to define m*n pixel units 12 .

The display panel 10 further includes a gate driving unit 14 and a common voltage supply unit 16. The gate driving unit 14 is electrically connected to the plurality of scan lines G1 G Gm for providing a scan signal to the pixel unit 12 and selecting a corresponding pixel unit 12 to control the on and off states of the pixel unit 12. The common voltage supply unit 16 supplies a reference voltage for each of the pixel units 12. Preferably, the gate driving unit 14 is disposed on the glass substrate of the display panel 10.

The timing control module 20 is electrically connected to the display panel 10 , the voltage generating module 40 , and the data driving module 60 . The timing control module 20 receives the input signal and generates different control signals according to the received input signal. The timing control module 20 outputs the gate control signal CONT1 to the display panel 10, and outputs the data, that is, the line inversion signal POL to the voltage generating module 40, and outputs the data control signal. The CONT2 and the data signal are sent to the data driving module 60. Preferably, the timing control module 20 receives the vertical sync signal Vsync, the level sync signal Hsync, the clock control signal DCLK, the data enable signal DE, and the image signal (R, G, B) output by an external graphics controller (not shown). ).

The voltage generation module 40 is electrically connected to the timing control module 20 and the data driving module 60. The voltage generating module 40 is configured to output a first reference voltage located in the first voltage range according to the data, that is, the line inversion signal. Wherein, the first voltage range is divided to form 2 ⁿ first reference voltages. The 2 ⁿ first reference voltages are gradually increased and are different, for example, 8.03V, 8.07V, 8.15V, . In the present embodiment, the first voltage range is 8 to 15V.

The data driving module 60 is electrically connected to the display panel 10, the timing control module 20, and the voltage generating module 40. The data control signal CONT2 and the image data DATA received by the data driving module 60 adjust the first voltage range to the second voltage range and divide into 2 ⁿ⁺¹ second reference voltages, and obtain the same according to the position of the pixel unit. The second reference voltage corresponding to the pixel unit is converted into a driving voltage and output to the pixel unit 12 in the display panel 10 through the data lines D1 to Dn. Wherein the number of the second reference voltage in the second voltage range is greater than the number of the first reference voltage in the first voltage range. Wherein, there is an intersection between the first voltage range and the second voltage range, and the maximum voltage of the second voltage range is greater than the maximum voltage of the first voltage range. Preferably, the first voltage range and the second voltage range have the same starting voltage. In the present embodiment, the second voltage range is 8 to 18V. It can be understood that the 2 ⁿ⁺¹ second reference voltages gradually increase and are different, for example, 8.04V, 8.09V, 8.18V, .

The data driving module 60 includes a processing unit 61, a searching unit 62, and a digital analog converting unit 64.

The processing unit 61 is electrically connected to the voltage generating module 40. The processing unit 61 adjusts the first voltage range to the second voltage range and divides into 2 ⁿ⁺¹ second reference voltages.

The searching unit 62 is electrically connected to the processing unit 61 and the digital analog conversion unit 64. The searching unit 62 acquires the second reference voltage in the second voltage range according to the position of the pixel unit 12 in the image data DATA. Preferably, the lookup unit 62 stores therein a lookup table that records the mapping relationship between the position of the pixel unit 12 and the second reference voltage. In this embodiment, the difference between the second reference voltage of the near-end pixel unit 12 of the data driving module 60 and the first reference voltage is smaller than the second reference of the pixel unit 12 located at the far end of the data driving module 60. The difference between the voltage and the first reference voltage. In other words, the voltage boosting amplitude of the pixel unit 12 at the far end of the data driving module 60 in the searching unit 62 is greater than the voltage boosting amplitude of the pixel unit 12 located at the near end of the data driving module 60.

The digital analog conversion unit 64 is electrically connected to the plurality of data lines D1 to Dn. The digital analog conversion unit 64 converts the data control signal CONT2 and the second reference voltage into driving voltages and outputs them to the pixel unit 12 in the display panel 10 through the data lines D1 to Dn.

The liquid crystal display device 100 outputs the driving voltage to the pixel unit according to the adjustment of the position of the pixel unit by the data driving module, thereby increasing the charging speed of the pixel unit. Meanwhile, the driving voltage of the pixel unit is improved, and the liquid crystal display can be improved. The image uniformity (Image Uniformity) caused by the device manufacturing process is poor, thereby improving the image display quality.

Please refer to FIG. 3 , which is a block diagram of a liquid crystal display device 300 of the second embodiment. The main difference between the liquid crystal display device 300 and the liquid crystal display device 100 of the first embodiment is the data driving module 80. The data driving module 80 includes an arithmetic unit 82 and a digital analog conversion unit 84.

The arithmetic unit 82 is electrically connected to the digital analog conversion unit 84. The operation unit 82 calculates a corresponding adjustment value according to the position of the pixel unit 12 in the image data DATA, and adds the first reference voltage corresponding to the pixel unit 12 and the corresponding adjustment value to the second reference voltage. In this embodiment, the adjustment value corresponding to the near-end pixel unit 12 of the data driving module 60 is smaller than the adjustment value corresponding to the remote pixel unit 12 of the data driving module 60. In other words, the arithmetic unit 82 is located The voltage boosting amplitude of the far-end pixel unit 12 of the data driving module 60 is greater than the voltage boosting amplitude of the pixel unit 12 located at the near end of the data driving module 60.

The digital analog conversion unit 84 is electrically connected to the plurality of data lines D1 to Dn. The digital analog conversion unit 84 converts the material control signal CONT2 and the second reference voltage into driving voltages and outputs them to the pixel unit 12 in the display panel 10 through the data lines D1 to Dn.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art to the present invention should be included in the following claims.

Claims (8)

A liquid crystal display device includes a display panel, a timing control module, a voltage generating module and a data driving module; the display panel includes m scanning lines, vertical insulation lines intersecting the scanning lines, n data lines, and scanning lines and data Line m*n pixel units; wherein m and n are natural numbers; the timing control module is configured to output data control signals and image signals to the data driving module; the voltage generating module output is located in the first voltage range a first reference voltage; wherein the data driving module is configured to adjust the first voltage range to the second voltage range and divide to form a plurality of second reference voltages, and obtain the second voltage range according to the position of the pixel unit a second reference voltage, and converting the second reference voltage into a driving voltage and outputting to the pixel unit in the display panel through the data line; wherein the number of the second reference voltage in the second voltage range is greater than the first voltage range number of first reference voltage; the first voltage range is divided into ^the 2 ⁿ first reference voltages, the voltage of the data driving module within a second voltage range is divided into 2 ^{n + 1} The second reference voltage. The liquid crystal display device of claim 1, wherein the data driving module comprises a processing unit, a searching unit, and a digital analog conversion unit; the processing unit adjusts the first voltage range to a second voltage range and divides into a plurality of a second reference voltage; the search unit acquires a second reference voltage in a second voltage range according to the received image data; the digital analog conversion unit converts the data control signal and the second reference voltage into a driving voltage and outputs the data to the display through the data line The pixel unit in the panel. The liquid crystal display device of claim 2, wherein the search unit stores a mapping relationship between a position of the pixel unit and a second reference voltage. The liquid crystal display device of claim 1, wherein the data driving module comprises an operation unit and a digital analog conversion unit; the operation unit calculates a corresponding adjustment value according to the position of the pixel unit, and the pixel unit is Adding the corresponding first reference voltage to the corresponding adjustment value, etc. And to the second reference voltage; the digital analog conversion unit converts the data control signal and the second reference voltage into driving voltages and outputs the data to the pixel units in the display panel through the data lines. a data driving module, the received data control signal, the image signal and the first reference voltage are converted and outputted to the pixel unit in the display panel; the data driving module adjusts the first voltage range to the second The voltage range is divided into a plurality of second reference voltages, the second reference voltage is obtained according to the position of the pixel unit, and the second reference voltage is converted into a driving voltage and output to a pixel unit in the display panel; wherein the second voltage The number of the second reference voltage in the range is greater than the number of the first reference voltage in the first voltage range; the first voltage range is divided into 2 ⁿ first reference voltages, and the data driving module divides the voltage in the second voltage range 2 ⁿ⁺¹ second reference voltages. The data driving module of claim 5, wherein the data driving module comprises a processing unit, a searching unit, and a digital analog conversion unit; the processing unit adjusts the first voltage range of the first reference voltage to the second voltage range Dividing into a plurality of second reference voltages; the searching unit acquires a second reference voltage in a second voltage range according to the position of the pixel unit; the digital analog conversion unit converts the data control signal and the second reference voltage into driving voltages Output to the pixel unit in the display panel through the data line. The data driving module of claim 6, wherein the searching unit stores a mapping relationship between a location of the pixel unit and a second reference voltage. The data driving module of claim 5, wherein the data driving module comprises an operation unit and a digital analog conversion unit; the operation unit calculates a corresponding adjustment value according to the position of the pixel unit, and the pixel is The first reference voltage corresponding to the unit is added to the corresponding reference value to the second reference voltage; the digital analog conversion unit converts the data control signal and the second reference voltage into driving voltages and outputs the pixels to the display panel through the data lines. unit.