Data driver circuit and associated method for use with scanned LCD video display
First Claim
1. A circuit for providing signal data to a display wherein the display has first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the circuit comprising:
- Y data input lines deposited on one of the substrates;
X groups of Y demultiplexer elements deposited on said one of the substrates wherein each demultiplexing element is connected to one of the Y data input lines;
a demultiplexing circuit external to the first substrate having X enabling signal lines respectively connected to the X groups of Y demultiplexing elements for enabling each of the X groups of Y demultiplexing elements;
a control circuit external to the substrates and providing a precharging voltage to the Y data input lines for a first time period and providing the signal data to the same Y data input lines for X successive second time periods; and
the demultiplexing circuit simultaneously enabling all of the Y data input lines to the X groups during said first time period and sequentially enabling the Y data input lines to a corresponding one of the X groups of Y demultiplexing elements during said X successive second time periods.
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Accused Products
Abstract
A data driver circuit and system driving scheme that can be integrated directly onto an LCD display substrate to reduce the cost of the peripheral integrated circuits and the hybrid assembly needed by unscanned active matrix liquid crystal displays to connect them to the array. A demultiplexer circuit is deposited on the display for demultiplexing a group of Y columns of multiplexed video data input signals to X groups of Y pixel capacitors that are also deposited on the substrate in Z rows. In addition, a data driver circuit provides voltage signals to precharge the pixel capacitors to a first voltage level in a first time period such that video data input signals coupled thereto in a multiplexed fashion during a second time period causes the pixel capacitors to store to a second predetermined voltage level to provide a video display as the rows of pixels are sequentially scanned.
88 Citations
12 Claims
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1. A circuit for providing signal data to a display wherein the display has first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the circuit comprising:
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Y data input lines deposited on one of the substrates; X groups of Y demultiplexer elements deposited on said one of the substrates wherein each demultiplexing element is connected to one of the Y data input lines; a demultiplexing circuit external to the first substrate having X enabling signal lines respectively connected to the X groups of Y demultiplexing elements for enabling each of the X groups of Y demultiplexing elements; a control circuit external to the substrates and providing a precharging voltage to the Y data input lines for a first time period and providing the signal data to the same Y data input lines for X successive second time periods; and the demultiplexing circuit simultaneously enabling all of the Y data input lines to the X groups during said first time period and sequentially enabling the Y data input lines to a corresponding one of the X groups of Y demultiplexing elements during said X successive second time periods. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of providing signal data to a display wherein the display has opposed first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the method comprising the steps of:
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depositing Y data input lines on the first substrate; depositing X groups of Y demultiplexing switches on the first substrate; coupling each demultiplexing switch to a respective one of the Y data input lines; providing a precharging voltage to the Y input lines for a first time period; providing the signal data to the same Y input lines for X successive second time periods; enabling each of the X groups of Y demultiplexing switches simultaneously when the precharging voltage is provided during the first time period; and enabling each of the same X groups of Y demultiplexing switches consecutively and sequentially when the signal data is provided during the X successive second time periods. - View Dependent Claims (9, 10, 11)
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12. A circuit for providing signal data to a display wherein the display has first and second substrates, at least the first of which is glass, separated by a layer of electro-optic material, the circuit comprising:
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Y data input lines deposited on the first substrate; X groups of Y pixel elements deposited on the first substrate wherein each pixel element in each of the X groups is connected to a respective one of the Y data input lines; a single on-glass gating switch coupled to each respective one of the pixel elements in each of the X groups; a first gate means external to the first substrate for providing precharging data to the Y data input lines; a second gate means external to the first substrate for coupling signal data to the same Y data input lines; a control circuit external to the first substrate and coupled to said first and second gates gate means for enabling the first gate means for a first time period to provide a precharging voltage to the Y data input lines; the control circuit subsequently disabling the first gate means and enabling the second gate means to provide signal data to the same Y data input lines during X successive second time periods;
through the same respective on-glass gating switches; anda demultiplexing circuit simultaneously enabling all X groups of Y data input lines during the first time period and sequentially enabling the X groups of Y data input lines during successive second time periods.
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Specification