PANEL CONTROL APPARATUS AND OPERATING METHOD THEREOF

• US 20130307835A1
• Filed: 05/16/2012
• Published: 11/21/2013
• Est. Priority Date: 05/16/2012
• Status: Active Grant

• Current Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Original Assignee: Himax Technologies Ltd. (Himax Technologies Incorporated)
• Inventors: Wu, Tung-Ying, Ho, Chun-Te
• Granted Patent: US 9,105,244 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G06F 16/40 of multimedia data, e.g. slideshows comprising image and additional audio data retrieval of still image data G06F16/50; retrieval of audio data G06F16/60; retrieval of video data G06F16/70
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence

Abstract

A panel control apparatus and an operating method thereof are provided, and which includes a scalar and a timing controller. The scalar transmits a present display data for composing a display frame, and determines whether to generate a refresh request signal according to a state of the display frame. The timing controller includes a memory, an over driving unit and a panel self refresh unit. When the refresh request signal is not generated, the over driving unit converts the present display data into an over driving display data according to a previous compression data from the memory. When the refresh request signal is generated, the panel self refresh unit compresses the present display data into a refresh display data, and stores the refresh display data into the memory.

Claims

1. A panel control apparatus, comprising:

a scalar, transmitting a present display data to compose a display frame, and determining whether to generate a refresh request signal according to a state of the display frame; and

a timing controller, comprising;

a memory;

an over driving unit, electrically connected to the memory, and when the refresh request signal is not generated, the over driving unit converts the present display data into an over driving display data according to a previous compression data from the memory; and

a panel self refresh unit, electrically connected to the memory, and when the refresh request signal is generated, the panel self refresh unit compresses the present display data into a refresh display data, and stores the refresh display data into the memory.

2. The panel control apparatus as claimed in claim 1, wherein the scalar determines whether the state of the display frame is static, and when the state of the display frame is static, the scalar generates the refresh request signal, and when the state of the display frame is dynamic, the scalar stops generating the refresh request signal.

3. The panel control apparatus as claimed in claim 1, further comprising:

a switch unit, electrically connected to the memory and the over driving unit, wherein when the refresh request signal is not generated, the switch unit transmits the over driving display data, and when the refresh request signal is generated, the switch unit transmits the refresh display data from the memory.

4. The panel control apparatus as claimed in claim 1, wherein when the refresh request signal is generated, the panel self refresh unit generates a refresh replying signal to cause the scalar to stop transmitting the present display data.

5. The panel control apparatus as claimed in claim 1, wherein the over driving unit comprises:

an over driving enabler, stopping generating an over driving enabling signal according to the refresh request signal;

an over driving compressor, reading the previous compression data from the memory according to the over driving enabling signal; and

an over driving generator, looking up an over driving table according to the previous compression data and the present display data, and generating the over driving display data accordingly.

6. The panel control apparatus as claimed in claim 5, wherein the over driving compressor further compresses the present display data into a present compression data according to the over driving enabling signal, and stores the present compression data into the memory.

7. The panel control apparatus as claimed in claim 1, wherein the panel self refresh unit comprises:

a self refresh enabler, generating a refresh enabling signal according to the refresh request signal; and

a self refresh compressor, compressing the present display data into the refresh display data according to the refresh enabling signal, and generating a refresh replying signal, wherein the scalar stops transmitting the present display data according to the refresh replying signal.

8. An operating method of a panel control apparatus, comprising:

transmitting a present display data to compose a display frame;

determining whether to generate a fresh request signal according to a state of the display frame;

when the refresh request signal is not generated, converting the present display data into an over driving display data according to a previous compression data from a memory of the panel control apparatus; and

when the refresh request signal is generated, compressing the present display data into a refresh display data and storing the refresh display data into the memory.

9. The operating method of the panel control apparatus as claimed in claim 8, wherein the step of determining whether to generate the fresh request signal according to the state of the display frame comprises:

determining whether the state of the display frame is static;

when the state of the display frame is static, generating the refresh request signal; and

when the display frame is dynamic, stopping generating the refresh request signal.

10. The operating method of the panel control apparatus as claimed in claim 8, further comprising:

when the refresh request signal is generated, generating a refresh replying signal to stop transmitting the present display data.

11. The operating method of the panel control apparatus as claimed in claim 8, further comprising:

when the refresh request signal is not generated, transmitting the over driving display data; and

when the refresh request signal is generated, transmitting the refresh display data from the memory.

12. The operating method of the panel control apparatus as claimed in claim 8, wherein the step of converting the present display data into the over driving display data according to the previous compression data from the memory of the panel control apparatus when the refresh request signal is not generated comprises:

stopping generating an over driving enabling signal according to the refresh request signal;

reading the previous compression data from the memory according to the over driving enabling signal; and

looking up an over driving table according to the previous compression data and the present display data, and generating the over driving display data accordingly.

13. The operating method of the panel control apparatus as claimed in claim 12, further comprising:

compressing the present display data into a present compression data according to the over driving enabling signal, and storing the present compression data into the memory.

14. The operating method of the panel control apparatus as claimed in claim 8, wherein the step of compressing the present display data into the refresh display data and storing the refresh display data into the memory when the refresh request signal is generated comprises:

generating a refresh enabling signal according to the refresh request signal; and

compressing the present display data into the refresh display data according to the refresh enabling signal.