TWI447701B - Liquid crystal display device, panel drive device and common polar school module - Google Patents

Description

Liquid crystal display device, panel driving device and common pole calibration module

The invention relates to a device, a device and a module, in particular to a liquid crystal display device, a panel driving device and a common pole calibration module.

As shown in FIG. 1, a conventional liquid crystal display device includes a panel driving device 1 and a liquid crystal panel 2.

The panel driving device 1 is configured to generate a source voltage VS, a gate voltage VG, and a common pole voltage VCOM.

The liquid crystal panel 2 is electrically connected to the panel driving device 1 to receive the source voltage VS, the gate voltage VG, and the common pole voltage VCOM, and the liquid crystal panel 2 includes a pixel unit 20 having the pixel unit A thin film transistor (TFT), a storage capacitor CS, and a liquid crystal capacitor C1.

The thin film transistor TFT has a source terminal receiving the source voltage VS, a gate terminal receiving the gate voltage VG, and a drain.

The storage capacitor CS has a first end electrically connected to the drain of the thin film transistor TFT and a grounded second end.

The liquid crystal capacitor C1 has a first end electrically connected to the drain of the thin film transistor TFT, and a second end receiving the common pole voltage VCOM.

<Panel drive unit>

The panel driving device 1 includes a pixel driving module 10 and a common pole calibration module 11 .

The pixel driving module 10 receives a video signal, and generates the source voltage VS and the gate voltage VG according to the pixel driving module 10, and the pixel driving module 10 has a scaling controller (scalar) 101 and a timing controller. (Timing Controller, T-CON) 102, a gate driver 103, and a source driver 104.

The zooming unit 101 has a storage unit 105, and receives the video signal, and converts the video signal to generate a low voltage differential signal (LVDS), wherein the storage unit 105 is used for storage. Adjusted settings, such as backlight adjustment.

The timing control unit 102 is electrically connected to the scaling adjuster 101 to receive the low voltage differential signal, and is accordingly processed to obtain a source control signal having clock information and pixel values, and a gate control. signal.

The gate driving unit 103 is electrically connected to the timing control unit 102 to receive the gate control signal, and accordingly generates the gate voltage VG.

The source driving unit 104 is electrically connected to the timing control unit 102 to receive the source control signal, and accordingly generates a source voltage VS whose magnitude is related to the pixel value.

The common pole calibration module 11 has an electrically erasable programmable read only memory (EEPROM) 110, a digital to analog converter 111, and a common voltage generator (common voltage). Generator) 112.

The electronic erasable programmable read only memory 110 is used to store a preset calibration voltage value in the form of a digit.

The digital to analog converter 111 is electrically connected to the electronic erasable programmable read only memory 110 to read the preset calibration voltage value, and performs digital to analog conversion to obtain a preset calibration voltage. The analog voltage of the value.

The common pole voltage generator 112 is electrically connected to the digital to analog converter 111 to receive the analog voltage, and is subjected to a level shift according to the analog voltage to generate the common pole voltage.

However, conventional liquid crystal display devices have the following disadvantages:

1. In order to avoid flickering of the screen displayed by the liquid crystal display device, the liquid crystal display device must be calibrated before the panel manufacturer to obtain an optimal preset calibration voltage value for use. The generation of the common voltage (VCOM) results in an increase in the calibration time before leaving the factory.

2. The electronically erasable programmable read only memory 110 is required to store the preset calibration voltage value and increase the hardware cost.

Accordingly, a first object of the present invention is to provide a liquid crystal display device which solves the above problems.

The liquid crystal display device comprises: a panel driving device comprising: a pixel driving module, receiving a video signal, and generating a source voltage and a gate voltage, and the pixel driving module has: a zoom adjuster having a storage unit for storing a preset calibration voltage value in a digital form; and a common pole calibration module having: a digit to analog converter, electrically connected The storage unit of the scaling adjuster reads the preset calibration voltage value, and performs digital to analog conversion to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generator, Connecting the digital to the analog converter to receive the analog voltage, and performing the level shift according to the analog voltage to generate the common pole voltage; and a liquid crystal panel electrically connected to the panel driving device to receive the source voltage, The gate voltage, and the common pole voltage.

A second object of the present invention is to provide a panel driving device.

The panel driving device is electrically connected to a liquid crystal panel and provides a source voltage, a gate voltage, and a common pole voltage to the liquid crystal panel, and the panel driving device comprises: a pixel driving module, receiving one a video signal, and the source voltage is generated, and the gate voltage is generated, and the pixel driving module has: a zoom adjuster, the zoom adjuster has a storage unit, and the storage unit is configured to store a digital form a preset calibration voltage value; and a common pole calibration module having: a digit to analog converter, electrically connected to the storage unit of the zoom adjuster to read the preset calibration voltage value, and digitally Analogizing to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generator electrically connected to the digital to analog converter to receive the analog voltage and performing a level shift according to the analog voltage Move to generate the common pole voltage.

A third object of the present invention is to provide a common pole calibration module.

The common pole calibration module is applied to a panel driving device, the panel driving device is electrically connected to a liquid crystal panel and provides a source voltage, a gate voltage, and a common pole voltage to the liquid crystal panel, and the The panel driving device includes a zoom adjuster, the zoom adjuster has a storage unit for storing a preset calibration voltage value in a digital form, and the common pole calibration module includes: a digital to analog converter Electrically connected to the storage unit of the scaling adjuster to read the preset calibration voltage value, and perform digital to analog conversion to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generation And electrically connecting the digit to the analog converter to receive the analog voltage, and performing a level shift according to the analog voltage to generate the common pole voltage.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

As shown in FIG. 2, a preferred embodiment of the liquid crystal display device of the present invention comprises: a panel driving device 3 and a liquid crystal panel 4.

The panel driving device 3 is configured to generate a source voltage VS, a gate voltage VG, and a common pole voltage VCOM.

The liquid crystal panel 4 is electrically connected to the panel driving device 3 to receive the source voltage VS, the gate voltage VG, and the common pole voltage VCOM, and the liquid crystal panel includes a pixel unit 40, the pixel unit 40 has A thin film transistor (TFT), a storage capacitor CS, and a liquid crystal capacitor C1.

The thin film transistor TFT has a source terminal receiving the source voltage VS, a gate terminal receiving the gate voltage VG, and a drain.

The storage capacitor CS has a first end electrically connected to the drain of the thin film transistor TFT and a grounded second end.

The liquid crystal capacitor C1 has a first end electrically connected to the drain of the thin film transistor TFT, and a second end receiving the common pole voltage VCOM.

<Panel drive unit>

The panel driving device 3 includes a pixel driving module 5 and a common pole calibration module 6.

The pixel driving module 5 receives a video signal, and generates the source voltage VS and the gate voltage VG according to the pixel driving module, and the pixel driving module has a scaling regulator (scalar) 51 and a timing controller ( Timing Controller (T-CON) 52, a Gate Driver 53, and a Source Driver 54.

The zooming unit 51 has a storage unit 50, and receives the video signal, and converts the video signal to generate a low voltage differential signal (LVDS). The storage unit 50 is configured to store a digital form. The preset calibration voltage value, and the storage unit 50 can be an electronic erasable rewritable read-only memory, a read only memory (ROM), and a flash memory.

The timing control unit 52 is electrically connected to the scaling adjuster 51 to receive the low voltage differential signal, and is accordingly processed to obtain a source control signal having clock information and pixel values, and a gate control. signal.

The gate driving unit 53 is electrically connected to the timing control unit 52 to receive the gate control signal, and accordingly generates the gate voltage VG.

The source driving unit 54 is electrically connected to the timing control unit 52 to receive the source control signal, and accordingly generates a source voltage VS whose magnitude is related to the pixel value.

The common pole calibration module 6 has a digital to analog converter 61 and a common voltage generator 62.

The digital-to-analog converter 61 is electrically connected to the storage unit 50 of the scaling adjuster 51 to read the preset calibration voltage value, and performs digital-to-analog conversion to obtain an analog voltage related to the preset calibration voltage value. .

The common pole voltage generator 62 is electrically connected to the digital to analog converter 61 to receive the analog voltage, and performs a level shift according to the analog voltage to generate the common pole voltage VCOM.

In summary, the above embodiment has the following advantages:

1. The panel factory will not need to adjust the preset calibration voltage value of the liquid crystal display device, but adjust the preset calibration voltage value to the system factory production line, thereby reducing the adjustment time of the panel factory and the matching system. The resulting compatibility issues.

2. Using the storage unit 50 of the zoom adjuster to store the preset calibration voltage value without using an additional electronic erasable programmable read only memory 110 (see FIG. 1) to store the preset calibration The voltage value can reduce the hardware cost compared to the prior art.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

3. . . Panel drive

4. . . LCD panel

40. . . Pixel unit

5. . . Pixel driver module

50. . . Storage unit

51. . . Zoom adjuster

52. . . Timing controller

53. . . Gate driver

54. . . Source driver

6. . . Common pole calibration module

61. . . Digital to analog converter

62. . . Common pole voltage generator

1 is a circuit diagram of a conventional liquid crystal display device; and

Figure 2 is a circuit diagram of a preferred embodiment of the liquid crystal display device of the present invention.

3. . . Panel drive

4. . . LCD panel

40. . . Pixel unit

5. . . Pixel driver module

50. . . Storage unit

51. . . Zoom adjuster

52. . . Timing controller

53. . . Gate driver

54. . . Source driver

6. . . Common pole calibration module

61. . . Digital to analog converter

62. . . Common pole voltage generator

Claims (10)

A liquid crystal display device comprising: a panel driving device comprising: a pixel driving module, receiving a video signal, and generating a source voltage and a gate voltage, and the pixel driving module has: a zoom adjuster having a storage unit for storing a preset calibration voltage value in a digital form; and a common pole calibration module having: a digit to analog converter, electrically connected The storage unit of the scaling adjuster reads the preset calibration voltage value, and performs digital to analog conversion to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generator, Connecting the digital to the analog converter to receive the analog voltage, and performing the level shift according to the analog voltage to generate the common pole voltage; and a liquid crystal panel electrically connected to the panel driving device to receive the source voltage, The gate voltage, and the common pole voltage. The liquid crystal display device of claim 1, wherein the zoom adjuster receives the video signal and converts the video signal to generate a low voltage differential signal, and the pixel driving module further comprises: a timing control unit electrically connected to the scaling regulator to receive the low voltage differential signal, and processed to obtain a source control signal having clock information and pixel values, and a gate control signal; a gate driving unit electrically connected to the timing control unit to receive the gate control signal, and accordingly generating the gate voltage; and a source driving unit electrically connected to the timing control unit to receive the source control signal And generating a source voltage of the magnitude associated with the pixel value. The liquid crystal display device of claim 1, wherein the liquid crystal panel comprises a pixel unit, the pixel unit having: a thin film transistor having a source terminal receiving the source voltage, receiving the a gate terminal of the gate voltage, and a drain; and a liquid crystal capacitor having a first end electrically connected to the drain of the thin film transistor and a second end receiving the common pole voltage. The liquid crystal display device of claim 3, wherein the pixel unit further comprises: a storage capacitor having a first end electrically connected to the drain of the thin film transistor, and a grounded second end. The liquid crystal display device according to claim 1, wherein the storage unit is an electronic erasable rewritable read-only memory, a read-only memory, or a flash memory. A panel driving device is electrically connected to a liquid crystal panel and provides a source voltage, a gate voltage, and a common pole voltage to the liquid crystal panel, and the panel driving device comprises: a pixel driving module, receiving one a video signal, and the source voltage is generated, and the gate voltage is generated, and the pixel driving module has: a zoom adjuster, the zoom adjuster has a storage unit, and the storage unit is configured to store a digital form a preset calibration voltage value; and a common pole calibration module having: a digit to analog converter, electrically connected to the storage unit of the zoom adjuster to read the preset calibration voltage value, and digitally Analogizing to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generator electrically connected to the digital to analog converter to receive the analog voltage and performing a level shift according to the analog voltage Move to generate the common pole voltage. The panel driving device of claim 6, wherein the zoom adjuster receives the video signal and converts the video signal to generate a low voltage differential signal, and the pixel driving module further comprises: a timing control unit electrically connected to the scaling regulator to receive the low voltage differential signal, and processed to obtain a source control signal having clock information and pixel values, and a gate control signal; a gate driving unit electrically connected to the timing control unit to receive the gate control signal, and accordingly generating the gate voltage; and a source driving unit electrically connected to the timing control unit to receive the source control signal And generating a source voltage of the magnitude associated with the pixel value. The panel driving device of claim 6, wherein the liquid crystal panel comprises a pixel unit, the pixel unit having: a thin film transistor having a source terminal for receiving the source voltage, and receiving the pixel a gate terminal of the gate voltage, and a drain; a storage capacitor having a first end electrically connected to the drain of the thin film transistor and a grounded second end; and a liquid crystal capacitor having an electrical connection a first end of the drain of the thin film transistor, and a second end receiving the common pole voltage. The panel driving device according to claim 6, wherein the storage unit is an electronic erasable rewritable read-only memory, a read-only memory, or a flash memory. A common pole calibration module is applied to a panel driving device, the panel driving device is electrically connected to a liquid crystal panel and provides a source voltage, a gate voltage, and a common pole voltage to the liquid crystal panel, and the The panel driving device includes a zoom adjuster, the zoom adjuster has a storage unit for storing a preset calibration voltage value in a digital form, and the common pole calibration module includes: a digital to analog converter Electrically connected to the storage unit of the scaling adjuster to read the preset calibration voltage value, and perform digital to analog conversion to obtain an analog voltage related to the preset calibration voltage value; and a common pole voltage generation And electrically connecting the digit to the analog converter to receive the analog voltage, and performing a level shift according to the analog voltage to generate the common pole voltage.