Driving circuit for display panel

• US 8,115,723 B2
• Filed: 03/30/2009
• Issued: 02/14/2012
• Est. Priority Date: 03/30/2009
• Status: Active Grant

• Current Assignee: Sitronix Technology Corporation
• Original Assignee: Sitronix Technology Corporation
• Inventors: Hung, Der-Ju, Yeh, Cheng-Chung
• Primary Examiner(s): Patel, Nitin
• Application Number:
  US12/413,673
• Publication Number:
  US 20100245314A1
• Time in Patent Office: 1,051 Days
• Field of Search: 345 87-100, 345/204, 345/211
• US Class Current: 345/98
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• 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 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

The present invention relates to a driving circuit for a display panel, which comprises a pre-charge power supply, a pre-charge switch, a buffer circuit, and a plurality of resistive devices. The pre-charge switch is coupled between the pre-charge power supply and a capacitor of the display panel. The buffer circuit is used for buffering a data signal and producing a buffer signal. The plurality of resistive devices is connected in series and coupled to the buffer circuit, and produces a plurality of driving signals therebetween according to the buffer signal. The driving circuit first closes the pre-charge switch to make the pre-charge power supply charge the capacitor. Then, one of the plurality of driving signals charges the capacitor. Thereby, the driving time can be shortened, and power of the display can be saved by avoiding power consumption on resistors.

Claims

1. A driving circuit for a display panel, comprising:

a pre-charge power supply;

a pre-charge switch, coupled between the pre-charge power supply and a capacitor of the display panel;

a buffer circuit, used for buffering a data signal and producing a buffer signal; and

a plurality of resistive devices, connected in series and coupled to the buffer circuit, and producing a plurality of driving signals between the plurality of resistive devices according to the buffer signal;

wherein the driving circuit first closes the pre-charge switch to make the pre-charge power supply charge the capacitor, and then one of the plurality of driving signals charges the capacitor.

2. The driving circuit for a display panel of claim 1, and applied to a data driving circuit of the display panel.

3. The driving circuit for a display panel of claim 1, and further comprising an analog-to-digital converter, used for converting an input signal and producing the data signal.

4. The driving circuit for a display panel of claim 1, and further comprising a Gamma circuit, producing and transmitting the input signal to the analog-to-digital converter according to a Gamma curve.

5. The driving circuit for a display panel of claim 1, wherein the driving circuit provides a positive-voltage signal or zero-voltage signal to the capacitor according to the polarity inversion requirement of the display panel.

6. The driving circuit for a display panel of claim 1, and further comprising a plurality of switches, one end of switches coupled between the plurality of resistive devices, respectively, the other end of the switches coupled to the display panel, one of the plurality of switches being closed according to a control signal, and producing and transmitting the driving signals to the capacitor.

7. The driving circuit for a display panel of claim 6, and further comprising an analog-to-digital converter, producing the control signal according to an input signal for closing one of the plurality of switches.

8. The driving circuit for a display panel of claim 1, wherein the buffer circuit comprises:

a first buffer, used for buffering the data signal, and producing a first buffer signal; and

a second buffer, used for buffering the data signal, and producing a second buffer signal.

9. The driving circuit for a display panel of claim 1, wherein the resistive device is a resistor.

10. The driving circuit for a display panel of claim 1, wherein the second buffer is an operational amplifier.

11. The driving circuit for a display panel of claim 1, wherein the first buffer is an operational amplifier.