Frame rate control system and method
OwnerJui Lianginventor
Life of this patent
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Abstract
A system and method of controlling the frame rate of signals for a video display device may employ a first-in/first-out (FIFO) frame rate control strategy for analog image source signals in conjunction with LCD panels. The disclosed system and method may dynamically adjust the frequency at which data are read out of a FIFO buffer, accounting for any frame rate differences between the source image data signal and the destination display device. Additionally, resolution of the output image may be adjusted to conform with the capabilities of the display apparatus.
Claims43
A method of controlling a frame rate;
- the method comprising:
- writing source data to a buffer and updating a write pointer;
- reading the source data from the buffer and updating a read pointer;
- comparing the write pointer and the read pointer;
- and
- adjusting a frequency of the reading responsive to the comparing.
A frame rate control system comprising:
- a buffer;
- a write control component configured to write data frames to the buffer at an image source signal frequency;
- and
- a read control component selectively operative to read the data frames from the buffer at a selected one of a plurality of display frequencies.
A method of controlling a frame rate of a display signal for a destination video display device;
- the method comprising:
- receiving an image source signal comprising source data;
- writing the source data to a buffer at a source frequency and updating a write pointer;
- reading the source data from the buffer at a display frequency and updating a read pointer;
- comparing information related to the write pointer and information related to the read pointer;
- responsive to the comparing, detecting a buffer overflow condition or a buffer underflow condition;
- modifying the source data in accordance with capabilities of the destination video display device;
- and
- responsive to the detecting, adjusting the display frequency in accordance with the buffer overflow condition or the buffer underflow condition.
A frame rate control system providing display signals to a video display device;
- the system comprising:
- a source signal interface receiving an image source signal;
- a buffer;
- a write control component operative to receive the image source signal and to write data frames from the image source signal to the buffer at an image source signal frequency;
- and
- a read control component selectively operative to read the data frames from the buffer at a selected one of a plurality of display frequencies.
A computer readable medium encoded with data and computer executable instructions for controlling a frame rate of signals for a display device, the data and instructions causing an apparatus executing the instructions to:
- write video frame source data to a buffer at a source frequency and update a write pointer;
- read the source data from the buffer at a display frequency and update a read pointer;
- compare the write pointer to the read pointer;
- and
- responsive to a comparison of the write pointer and the read pointer, adjust the display frequency.
Dependencies are inferred from the claim text.