SOURCE DRIVER DEVICE AND DISPLAY DEVICE HAVING THE SAME

• US 20100060621A1
• Filed: 09/10/2008
• Published: 03/11/2010
• Est. Priority Date: 09/10/2008
• Status: Abandoned Application

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Hsu, Chuan-Chien
• Application Number:
  US12/208,033
• Publication Number:
  US 20100060621A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2360/128 Frame memory using a Synchronous Dynamic RAM [SDRAM]
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

A source driver device for driving a display panel includes a gamma voltage generator having a storage element and a plurality of gamma digital-to-analog converters, a data digital-to-analog converter coupled to the gamma voltage generator, and a receiver for receiving input display data from a data bus, for parsing the input display data to transmit generated display data to the data digital-to-analog converter, and for transmitting a plurality of gamma data signals to the storage element, wherein each of the plurality of gamma digital-to-analog converters receive the plurality of gamma data signals from the storage element for generating a plurality of reference voltage signals based on the corresponding gamma data signals, and wherein the data digital-to-analog converter is coupled to the receiver to receive the generated display data, according to the generated plurality of reference voltage signals generated from the gamma digital-to-analog converters, and to generate a driving voltage signal based on the generated display data for driving the display panel.

Claims

1. A source driver device for driving a display panel, the source driver device comprising:

a gamma voltage generator having a storage element and a plurality of gamma digital-to-analog converters;

a data digital-to-analog converter coupled to the gamma voltage generator; and

a receiver for receiving input display data from a data bus, for parsing the input display data to transmit generated display data to the data digital-to-analog converter, and for transmitting a plurality of gamma data signals to the storage element,

wherein each of the plurality of gamma digital-to-analog converters receive the plurality of gamma data signals from the storage element for generating a plurality of reference voltage signals based on the corresponding gamma data signals, and

wherein the data digital-to-analog converter is coupled to the receiver to receive the generated display data, according to the generated plurality of reference voltage signals generated from the gamma digital-to-analog converters, and to generate a driving voltage signal based on the generated display data for driving the display panel.

2. The source driver device of claim 1, further comprising a plurality of operational amplifiers, each coupled one of the plurality of gamma digital-to-analog converters, for enhancing the plurality of reference voltage signals.

3. The source driver device of claim 1, further comprising a voltage divider coupled to the plurality of gamma digital-to-analog converters for interpolating the reference voltage signals.

4. The source driver device of claim 3, wherein the voltage divider includes a resistor string.

5. The source driver device of claim 1, wherein the plurality of gamma digital-to-analog converters include a resistive digital-to-analog converter that includes a plurality of resistors.

6. The source driver device of claim 1, wherein the display panel includes liquid crystal display.

7. The source driver device of claim 1, wherein the storage element includes one of a Static Random Access Memory device, a Dynamic Random Access Memory device, and a Synchronous Dynamic Random Access Memory device.

8. The source driver device of claim 1, wherein the plurality of gamma data signals is transmitted to the receive during a vertical blanking time interval.

9. The source driver device of claim 1, wherein the plurality of gamma data signals is transmitted to the receiver during a horizontal blanking time interval.

10. The source driver device of claim 1, wherein the plurality of gamma data signals is transmitted before a start pulse is supplied to the source driver device.

11. The source driver device of claim 1, wherein the input display data includes Reduced Swing Differential Signaling signals.

12. The source driver device of claim 1, wherein the plurality of gamma data signals includes Transistor-Transistor Logic signals.

13. A display device, comprising:

a display panel; and

a source driver including;

a gamma voltage generator having including a storage element, a plurality of gamma digital-to-analog converters, and a voltage divider;

a data digital-to-analog converter coupled to the gamma voltage generator; and

a receiver for receiving input display data transmitted along a data bus, for parsing the input display data to transmit generated display data to the data digital-to-analog converter, and for transmitting a plurality of gamma data signals to the storage element,

wherein the storage element is coupled to the receiver and receives and stores the plurality of gamma data signals,

wherein the plurality of gamma digital-to-analog converters are coupled to the storage element to receive the plurality of gamma data signals for generating a plurality of reference voltage signals based upon the plurality gamma data signals, and

wherein the voltage divider is coupled to the gamma digital-to-analog converters for generating a plurality of gamma voltage signals based on the plurality of reference voltage signals, the data digital-to-analog converter is coupled to the receiver to receive the generated display data, and to generate driving voltage signals based on the generated display data for driving the display panel according to the plurality of gamma voltage signals received from the voltage divider.

14. The display device of claim 13, wherein the display device is a liquid crystal display device.

15. The display device of claim 13, wherein the input display data include Reduced Swing Differential Signaling signals, and the plurality of gamma data signals include Transistor-Transistor Logic signals.

16. The display device of claim 13, wherein the source driver is a semiconductor integrated circuit chip, and the gamma voltage generator, the storage element, the plurality of gamma digital-to-analog converters, the voltage divider, the data digital-to-analog converter, and the receiver are integral on the semiconductor integrated circuit chip.

17. The display device of claim 13, wherein the storage element includes one of a Static Random Access Memory device, a Dynamic Random Access Memory device, and a Synchronous Dynamic Random Access Memory device.

18. The display device of claim 13, wherein the source driver further comprises a plurality of operational amplifiers connected between the plurality of gamma digital-to-analog converters and the voltage divider.

19. The display device of claim 13, wherein the plurality of gamma data signals is transmitted to the receiver during a vertical blanking time interval.

20. The display device of claim 13, wherein the plurality of gamma data signals is transmitted to the receiver during a horizontal blanking time interval.

21. The display device of claim 13, wherein the plurality of gamma data signals is transmitted before a start pulse is supplied to the source driver device.