Driving system for LCD apparatus and method thereof

• US 9,218,774 B2
• Filed: 05/03/2012
• Issued: 12/22/2015
• Est. Priority Date: 03/31/2012
• Status: Expired due to Fees

• Current Assignee: Hisense Hiview Tech Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Hisense Hiview Tech Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: Huang, Shunming
• Primary Examiner(s): Sasinowski, Andrew
• Application Number:
  US14/115,097
• Publication Number:
  US 20140125710A1
• Time in Patent Office: 1,328 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A driving system for a liquid crystal display apparatus and a method thereof are provided, the driving system comprises a data-latching circuit, a synchronous-signal separating module, a vertical synchronous-signal discriminator, a vertical synchronous-signal counter, a horizontal synchronous-signal discriminator, a data operator and a polarity-signal generator. The vertical synchronous-signal discriminator outputs a start signal to the polarity-signal generator when vertical synchronous signals exist. The vertical synchronous-signal counter accumulates an amount of the vertical synchronous signals, and outputs an accumulated result to the data operator. The horizontal synchronous-signal discriminator sends the start signal to the data operator. The data operator subtracts odd sub-pixel data from even sub-pixel data of RGB data in a horizontal line or subtracts the even sub-pixel date from the odd sub-pixel date to obtain an Msum value, and controls the polarity-signal generator output polar-controlling signals to scan lines according to the Msum value and the accumulated result.

Claims

1. A driving system for a liquid crystal display (LCD) apparatus, comprising a data-latching circuit, a synchronous-signal separating module and a polarity-signal generator, the data-latching circuit being configured for separating input signals into RGB data and data-enable signals, the synchronous-signal separating module being configured for converting the data-enable signals into vertical synchronous signals and horizontal synchronous signals, wherein the driving system for the LCD apparatus further comprises a vertical synchronous-signal discriminator, a vertical synchronous-signal counter, a horizontal synchronous-signal discriminator and a data operator;

the vertical synchronous-signal discriminator, the vertical synchronous-signal counter and the horizontal synchronous-signal discriminator are electrically coupled to the synchronous-signal separating module;

the vertical synchronous-signal discriminator sends out a start signal to the polarity-signal generator if it judges there are the vertical synchronous signals;

the vertical synchronous-signal counter is configured for accumulating an amount of the vertical synchronous signals and sending out an accumulated result to the data operator;

the horizontal synchronous-signal discriminator sends out a start signal to the data operator if it judges there are the horizontal synchronous signals; and

the data operator starts to operate after receiving the start signal sent out from the horizontal synchronous-signal discriminator, subtracts data of odd sub-pixels by data of even sub-pixels which are arranged in a horizontal line of the RGB data or subtracts data of the even sub-pixels by the odd sub-pixels, to obtain an Msum value, and then controls the polarity-signal generator to output polar-controlling signals corresponding to a scan line according to the Msum value and the accumulated result of the vertical synchronous-signal counter accumulating the amount of the vertical synchronous signals.

2. The driving system for the LCD apparatus according to claim 1, wherein an input terminal of the horizontal synchronous-signal discriminator is electrically coupled to the synchronous-signal separating module through the vertical synchronous-signal counter and the vertical synchronous-signal discriminator, and an output terminal thereof is electrically coupled to the data operator;

and

an output terminal of the vertical synchronous-signal counter electrically coupled to the data operator through the horizontal synchronous-signal discriminator.

3. The driving system for the LCD apparatus according to claim 1, wherein an input terminal of the horizontal synchronous-signal discriminator is electrically coupled to the synchronous-signal separating module through the vertical synchronous-signal counter and the vertical synchronous-signal discriminator, and an output terminal thereof is electrically coupled to the data operator;

and

an output terminal of the vertical synchronous-signal counter directly coupled to the data operator.

4. The driving system for the LCD apparatus according to claim 1, wherein an input terminal of the horizontal synchronous-signal discriminator is directly coupled to the synchronous-signal separating module, and an output thereof is directly coupled to the data operator;

an output terminal of the vertical synchronous-signal counter is directly coupled to the data operator.

5. The driving system for the LCD apparatus according to claim 4, wherein the vertical synchronous-signal counter accumulates in binary.

6. A driving method for a liquid crystal display (LCD) apparatus comprising steps of:

(1) employing a data-latching circuit to latch input signals and separating the input signals into RGB data and data-enable signals;

(2) employing a synchronous-signal separating module to convert the data-enable signals into vertical synchronous signals and horizontal synchronous signals;

(3) employing a vertical synchronous-signal discriminator to determine whether the vertical synchronous signals exist, and if the vertical synchronous signals exist, then performing step (4), otherwise returning to perform step (1);

(4) starting a polarity-signal generator to operate, and employing a vertical synchronous-signal counter to accumulate an amount of the vertical synchronous signals, K =K +1;

(5) employing a horizontal synchronous-signal discriminator to determine whether horizontal synchronous signals exist, if the horizontal synchronous signals exist, then performing step (6), otherwise returning to perform step (2);

(6) starting a data operator to operate, and subtract data of odd sub-pixels by data of even sub-pixels which are arranged in a horizontal line of the RGB data or subtract data of the even sub-pixels by the odd sub-pixels, to obtain an Msum value, and determining polarity of corresponding scan lines according the Msum value and K; and

(7) employing a polarity-signal generator to output polar-controlling signals according to a determination result of the data operator.

7. The driving method for LCD apparatus according to claim 6, wherein the vertical synchronous-signal counter accumulates in binary.

8. The driving method for the LCD apparatus according to claim 7, wherein:

When Msum <

0, K =0, the polar-controlling signals are logic low;

when Msum <

0, K ≠

0, the polar-controlling signals are logic high;

when Msum>

0, K =0, the polar-controlling signals are logic high;

when Msum>

0, K ≠

0, the polar-controlling signals are logic low;

when Msum =0, K =0, polarity of the polar-controlling signals of a scan line is opposite with the polarity of the polar-controlling signals of a previous scan line.

9. The driving method for the LCD apparatus according to claim 7, wherein positive voltage is applied to the odd sub-pixels, the negative voltage is applied to the even sub-pixels, and the data operator subtracts data of even sub-pixels by data of odd sub-pixels which are arranged in a horizontal line of the RGB data to obtain the Msum value, and compare the Msum value with zero to determine whether polarity of a scan line and polarity of a next scan line is the same, if the polarity of the scan line and the polarity of the next scan line is the same, the positive voltage is applied to the even sub-pixels, the negative voltage is applied to the odd sub-pixels, and if the polarity of the scan line and the polarity of the next scan line is different, the negative voltage is applied to the even sub-pixels, the positive voltage is applied to the even sub-pixels.

10. The driving method for LCD apparatus according to claim 9, wherein when the data operator accumulates the Msum value, the data operator substrates data of even sub-pixels by data of odd sub-pixels of inputting two pixels to obtain an Mn value, then adds up the Mn value in a horizontal line to obtain the Msum value;

wherein n represents the times for transmitting data.

11. The driving method for the LCD apparatus according to claim 7, wherein positive voltage is applied to the even sub-pixels, the negative voltage is applied to the odd sub-pixels, and the data operator subtracts data of even sub-pixels by data of odd sub-pixels which are arranged in a horizontal line of the RGB data to obtain the Msum value, and compare the Msum value with zero to determine whether the polarity of a scan line and polarity of a next scan line is the same, if the polarity of the scan line and the polarity of the next scan line is the same, the negative voltage is applied to the even sub-pixels, the positive voltage is applied to the odd sub-pixels, and if the polarity of the scan line and the polarity of the next scan line is different, the positive voltage is applied to the even sub-pixels, the negative voltage is applied to the even sub-pixels.

12. The driving method for the LCD apparatus according to claim 11, wherein when the data operator accumulates the Msum value, the data operator substrates data of even sub-pixels by data of odd sub-pixels of inputting two pixels to obtain an Mn value, then adds up the Mn value in a horizontal line to obtain the Msum value;

wherein n represents the times for transmitting data.

13. A driving system for a liquid crystal display (LCD) apparatus, wherein the driving system for the LCD apparatus comprises:

a data-latching circuit, configured for separating input signals into RGB data and a data-enable signals;

a synchronous-signal separating module, electrically coupled to the data-latching circuit, to convert the data-enable signals into vertical synchronous signals and horizontal synchronous signals;

a vertical synchronous-signal discriminator, electrically coupled to the synchronous-signal separating module, to determine whether the vertical synchronous signals exist;

a vertical synchronous-signal counter, electrically coupled to the vertical synchronous-signal discriminator, to accumulates an amount of the vertical synchronous signals and send out an accumulated result to the data operator;

a horizontal synchronous-signal discriminator, configured for determining whether the horizontal synchronous signals exist, and sending out a start signal when the horizontal synchronous-signal discriminator determines the horizontal synchronous signals exist;

a data operator, electrically coupled to the horizontal synchronous-signal discriminator, to start to operate after receiving the start signal sent out from the horizontal synchronous-signal discriminator, and subtract data of odd sub-pixels by data of even sub-pixels which are arranged in a horizontal line of the RGB data or subtract data of the even sub-pixels by the odd sub-pixels, to obtain an Msum value, and then determine polarity of corresponding a scan line according to the Msum value and the accumulated result of the vertical synchronous-signal counter accumulating the amount of the vertical synchronous signals; and

a polarity-signal generator, electrically coupled to the data operator, to output polar-controlling signals according to the determination result of the data operator.

14. The driving system for the LCD apparatus according to claim 13, wherein the horizontal synchronous signals is sent out from the synchronous-signal separating module through the vertical synchronous-signal discriminator and the vertical synchronous-signal counter to the horizontal synchronous-signal discriminator, and the accumulated result of the vertical synchronous-signal counter accumulating the amount of the vertical synchronous signals is sent out from the horizontal synchronous-signal discriminator to the data operator.

15. The driving system for the LCD apparatus according to claim 13, wherein the accumulated result of the vertical synchronous-signal counter accumulating the amount of the vertical synchronous signals is directly sent out to the data operator.

16. The driving system for the LCD apparatus according to claim 13, wherein the horizontal synchronous signals is directly sent out from the synchronous-signal separating module to the horizontal synchronous-signal discriminator, and the accumulated result of the vertical synchronous-signal counter accumulating the amount of the vertical synchronous signals is sent out from the horizontal synchronous-signal discriminator to the data operator.

17. The driving system for the LCD apparatus according to claim 13, wherein the vertical synchronous-signal counter accumulates in binary.