Simultaneous sampling of demultiplexed data and driving of an LCD pixel array with ping-pong effect
AssigneeDavid Sarnoff Research Center, Inc.
InventorJames H. Atherton
Life of this patent
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Abstract
A data driver circuit for an LCD including a switching circuit for transferring a data signal from a data channel to a first data line and a second data line. Also included is a sample circuit which alternately samples the data signal from the first data line and the second data line to produce and store respectively a first and second sampling data signal during a respective first and second time period. A data driver retrieves from the sample circuit the first sample data signal during the second time period and the second sampled data signal during the first time period. Then, the data driver transfers a driving pulse corresponding to one of the first sampled data signal and the second sampled data signal to the display.
Claims21
A data driver for a display, the data driver comprising:
- means for providing a data signal from a data channel to a first data line and a second data line;
- sample means for alternately sampling the data signal (1) from the first data line to produce and store a first sampled data signal during a first time period and (2) from the second data line to produce and store a second sampled signal during a second time period;
- and
- data driver means for retrieving from the sample means, the first sample data signal during the second time period and the second sampled data signal during the first time period and for transferring a driving pulse corresponding to one of the first sampled data signal and the second sampled data signal to the display.
A data driver for a display, the data driver comprising:
- means for providing a data signal from a data channel to a first data line and a second data line;
- sample means for sampling the data signal from (1) the first data line to produce and store a first sampled data signal and (2) from the second data line to produce and store a second sampled signal;
- and
- data driver means for retrieving from the sample means, the first sampled data signal during a second time period and a second sampled data signal during a first time period and for transferring a driving pulse corresponding to one of the first sampled data signal and the second sampled data signal to the display, the data driver means having switching means which has a conductive path between a first electrode and a second electrode, the switching means also having a third electrode for receiving a control signal to regulate the conductive path, the data driver means also having means for applying a potential between the first electrode and the third electrode which remains substantially the same when a ramp signal is applied to the first electrode.
A method for driving a display, the method comprising the steps of:
- providing a data signal from a data channel to a first data line and a second data line;
- alternately sampling the data signal (1) from the first data line to produce and store a first sampled data signal during a first time period and (2) from the second data line to produce and store a second sampled signal during a second time period;
- retrieving from the sample means, the first sampled data signal during the second time period and the second sampled data signal during the first time period;
- and
- transferring a driving pulse corresponding to one of the first sampled data signal and the second sampled data signal to the display.
A method for driving a display, the method comprising the steps of:
- providing a data signal from a data channel to a first data line and a second data line;
- sampling the data signal from the first data line to produce and store a first sampled data signal and from the second data line to produce and store a second sampled signal;
- retrieving the first sampled data signal and the second sampled data signal;
- transferring a driving pulse corresponding to one of the first sampled data signal and the second sampled data signal to the display through a switch means having a conductive path between a first electrode and a second electrode which is controlled by a third electrode by maintaining a substantially constant potential between the first electrode and the third electrode when a ramp signal is applied to the first electrode.
A comparator means comprising:
- differential pair means for comparing an input signal to a reference signal to generate a compared signal, and
- current source means for generating a constant current signal for the differential pair means, the current source means including:
- (1) switching means having a conductive path between a first electrode and a second electrode where the second electrode is coupled to a negative voltage source, the switching means also has a third electrode;
- and
- (2) means for (a) initializing a source current signal flowing through the conductive path and (b) floating the third electrode of the switching means to regulate the conductive path so that the source current signal flowing through the conductive path remains substantially constant.
Dependencies are inferred from the claim text.