Portable display device and method utilizing embedded still image buffer to facilitate full motion video playback

• US 20040119670A1
• Filed: 12/20/2002
• Published: 06/24/2004
• Est. Priority Date: 12/20/2002
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Rivera-Cintron, Carlos, Baudino, Daniel
• Granted Patent: US 7,081,874 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 5/395 Arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen G09G5/399 takes precedence

Abstract

A portable display device (10) includes an LCD display module (12) that includes an embedded still image buffer (16), and external processing circuitry (24) and associated processor memory (22), wherein the processor memory (22) receives decoded motion video (30) as pixel data from a video decoder (216), while the data from the embedded still image memory is displayed on an LCD display (14). When a completely decoded frame of video is stored in the memory, the processing circuitry (24) turns an external pixel transfer clock signal (19) on and transfers the decoded frame (21) from the memory (22) to the embedded image buffer (16) in the LCD display module (12). When the transfer of the decoded frame (21) is complete, an end of frame indication signal (236) is generated and the processing circuitry (24) turns off the external pixel transfer clock signal (19) to the LCD display module (12) so that decoding of the next frame of encoded motion video (28) can be placed in the external processor memory (22).

Claims

1. A portable display device comprising:

an LCD display module that includes;

at least an LCD display, and

embedded still image buffer, operatively coupled to the LCD display, and that displays contents of the embedded still image buffer as an image frame on the LCD display wherein the embedded still image buffer is operatively responsive to an external pixel transfer clock signal that controls transfer of pixel data into the embedded still image buffer;

first memory that receives decoded motion video as pixel data from a video decoder;

processing circuitry, operatively coupled to the memory and to the LCD module, that is operative to;

(a) keep the external pixel transfer clock signal off while the memory receives decoded video information,

(b) turn the external pixel transfer clock signal on in response to a frame of decoded motion video being available from the memory;

(c) transfer the decoded frame from the memory to the embedded still image buffer in the LCD display module;

(d) generate an end of frame indication signal indicating that transfer of the decoded frame is complete and turn off the external pixel transfer clock signal to the LCD display module; and

(e) repeat (a)-(d) at a frame rate to effect moving video images from the embedded still image buffer.

2. The portable display device of claim 1 wherein the first memory is partitioned to store the decoded video in one portion and graphic information associated with a graphic user interface in another portion.

3. The portable display device of claim 1 wherein the processing circuitry generates frame ready data representing that a decoded frame of video is available in the memory for display.

4. The portable display device of claim 1 wherein the processing circuitry includes one or more processors and second memory containing executable instructions stored therein that when executed by the one or more processors causes the one or more processors to carry out steps (a)-(e).

5. A portable display device comprising:

an LCD display module that includes;

at least an LCD display, and

embedded still image buffer, operatively coupled to the LCD display, and that displays contents of the embedded still image buffer as an image frame on the LCD display wherein the embedded still image buffer is operatively responsive to an external pixel transfer clock signal that controls transfer of pixel data into the embedded still image buffer;

first memory that receives decoded motion video as pixel data from a video decoder;

processing circuitry, operatively coupled to the memory, that provides control data;

an LCD controller, operatively responsive to the control data and operatively coupled to the LCD display module, the processing circuitry and to the memory, and operative to provide the pixel data to the LCD display module and to control the external pixel transfer clock signal to the embedded still image buffer in response to the control data;

such that the processing circuitry generates control data to;

(a) keep the external pixel transfer clock signal off while the first memory receives decoded video information;

(b) turn the external pixel transfer clock signal on in response to a frame of decoded motion video being available from the first memory;

(c) cause the LCD controller to transfer the decoded frame from the memory to the embedded still image buffer in the LCD display module;

and wherein the processing circuitry;

(d) receives an end of frame indication signal from the LCD controller and causes the LCD controller to turn off the external pixel transfer clock signal to the LCD display module.

6. The portable display device of claim 5 wherein the first memory is partitioned to store the decoded video in one portion and graphic information associated with a graphic user interface in another portion.

7. The portable display device of claim 5 wherein the control data includes frame ready data representing that a decoded frame of video is available in the memory for display.

8. The portable display device of claim 5 wherein the processing circuitry includes one or more processors and second memory containing executable instructions stored therein that when executed by the one or more processors causes the one or more processors to carry out steps (a)-(e).

9. The portable display device of claim 8 wherein the executable instructions stored in the second memory include at least a graphic user interface (GUI) module, a multimedia engine module and a display driver module wherein the display driver module causes graphics information from the GUI module to be stored in the first memory and causes the control data to be sent to the LCD controller and wherein the multimedia engine module generates data to control the video decoder to decode incoming encoded video data and sends frame ready data representing that a decoded frame of video is available in the first memory for display and the display driver module generates the control data for the LCD controller to turn the external pixel transfer clock signal on in response to the frame ready data.

10. A method for displaying motion video on a portable display device that includes an LCD display module having an LCD display and an embedded still image buffer that is operatively responsive to an external pixel transfer clock signal, comprising:

(a) keeping the external pixel transfer clock signal off while storing decoded video information in a first memory [while displaying contents of the embedded still image buffer on the LCD display and until a frame of decoded motion video is available from the first memory,

(b) turning the external pixel transfer clock signal on in response to a frame of decoded motion video being available from the first memory;

(c) transferring, in response to step (b), the decoded frame from the first memory to the embedded still image buffer in the LCD display module;

(d) generating an end of frame indication signal and turning off the external pixel transfer clock signal to the LCD display module in response to the end of frame indication signal; and

(e) repeating the steps of (a)-(d) at a frame rate to effect moving video images from the embedded still image buffer.

11. The method of claim 10 including displaying, on the LCD display, contents from the embedded still image buffer while storing decoded video information in the first memory.

12. A method for displaying moving images on a handheld electronics device, comprising:

sequentially decoding frames of encoded motion video;

storing each decoded frame of motion video after decoding in a memory device;

transferring each decoded frame of motion video, stored in the memory device, to an embedded still image buffer of an LCD display module;

displaying each frame of decoded motion video transferred to the embedded still image buffer on an LCD display of the LCD display module.

13. The method of claim 12,

transferring each decoded frame of motion video, stored in the memory device, with an external pixel transfer clock signal,

disabling the external pixel transfer clock signal when not transferring decoded motion video frames to the embedded still image buffer.