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US 10,070,018 B2Granted
Device for vertical and horizontal synchronization in display system
AssigneeSynaptics Japan GK
InventorTsuyoshi Kuroiwa
Life of this patent
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Abstract
A display driver for a display device including a sync extraction circuit configured to generate a vertical sync source signal in response to a vertical sync period start instruction indicating a start of a vertical sync period, a timing generator configured to generate an internal vertical sync signal in response to the vertical sync source signal; and a drive circuit configured to drive the display panel in synchronization with the internal vertical sync signal.
Claims16
A display driver for driving a display panel, comprising:
- a sync extraction circuit comprising:
- a vertical sync period start instruction detect section configured to detect a vertical sync period start instruction to generate a vertical sync period start instruction detect signal, the vertical sync period start instruction being supplied external from of the display driver;
- a pseudo vertical sync signal generator section including a counter, the pseudo vertical sync signal generator section configured to generate a pseudo vertical sync signal in response to a count value held by the counter;
- and
- a logic circuit section configured to generate a vertical sync source signal in response to the vertical sync period start instruction detect signal and the pseudo vertical sync signal, and the sync extraction circuit is configured to:
- assert the vertical sync source signal based on a detection of the vertical sync period start instruction;
- and
- assert the vertical sync source signal based on a determination that a predetermined period of time has passed after a previous assertion of the vertical sync source signal;
- and
- a timing generator circuit configured to:
- generate an internal vertical sync signal in response to the vertical sync source signal;
- and
- assert the internal vertical sync signal in response to the assertion of the vertical sync source signal;
- and
- a drive circuit configured to drive the display panel in synchronization with the internal vertical sync signal.
12 more elements
A display driver for driving a display panel, comprising:
- a sync extraction circuit comprising:
- a horizontal sync period start instruction detect section configured to detect a vertical sync period start instruction to generate a vertical sync period start instruction detect signal, the horizontal sync period start instruction being supplied from outside of the display driver;
- a pseudo horizontal sync signal generator section including a counter, the pseudo horizontal sync signal generator configured to generate a pseudo horizontal sync signal in response to a count value held by the counter;
- and
- a logic circuit section configured to generate a horizontal sync source signal in response to the horizontal sync period start instruction detect signal and the pseudo horizontal sync signal, and the sync extraction circuit is configured to:
- assert the horizontal sync source signal when detecting the horizontal sync period start instruction;
- and
- assert the horizontal sync source signal when a predetermined period of time has passed after a previous assertion of the horizontal sync source signal;
- and
- a timing generator configured to:
- generate an internal horizontal sync signal in response to the horizontal sync source signal;
- and
- assert the internal horizontal sync signal in response to an assertion of the horizontal sync source signal;
- and
- a drive circuit configured to drive the display panel in synchronization with the internal horizontal sync signal.
12 more elements
A display device, comprising:
- a display driver;
- and
- a display panel,
- wherein the display driver includes:
- a sync extraction circuit configured to:
- generate a vertical sync source signal in response to a vertical sync period start instruction indicating a start of a vertical sync period a horizontal sync source signal in response to a horizontal sync period start instruction indicating a start of a horizontal sync period, the vertical sync period start instruction and the horizontal sync period start instruction being supplied from outside of the display driver;
- assert the vertical sync source signal when detecting the vertical sync period start instruction, and when a first predetermined period of time has passed after a previous assertion of the vertical sync source signal;
- and
- assert the horizontal sync source signal when detecting the horizontal sync period start instruction, and when a second predetermined period of time has passed after a previous assertion of the horizontal sync source signal;
- a timing generator configured to:
- generate an internal vertical sync signal in response to the vertical sync source signal and an internal horizontal sync signal in response to the horizontal sync source signal;
- and
- assert the internal vertical sync signal in response to an assertion of the vertical sync source signal and the internal horizontal sync signal in response to an assertion of the horizontal sync source signal;
- and
- a drive circuit configured to:
- drive the display panel in synchronization with the internal vertical sync signal and the internal horizontal sync signal.
13 more elements
Dependencies are inferred from the claim text.