METHOD AND APPARATUS FOR DRIVING LIQUID CRYSTAL DISPLAY PANEL
First Claim
1. A liquid crystal display apparatus, comprising:
- an active matrix type liquid crystal panel in which potentials of respective data lines are applied to respective display electrodes of a selected display line via respective switching devices of said selected display line, said selected display line corresponding to a selected one of scanning lines;
a data driver for applying said potentials to said respective data lines and renewing said potentials at every horizontal cycle;
a scanning driver for providing scanning pulses to said respective scanning lines in line-sequence; and
a control circuit for causing a timing of the rear edge of a scanning pulse provided to a predetermined scanning line to coincide with a time when said potentials of said data lines is renewed, wherein said predetermined scanning line is one corresponding to an addition of picture line to or a reduction of picture line from a picture to be displayed, in order to compensate a difference between the number of said scanning lines and that of picture lines of said picture to be displayed.
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Accused Products
Abstract
A LCD apparatus has a control circuit 40 which makes a timing of the rear edge of scanning pulses provided to predetermined scanning lines coincide with the time when the display potential is renewed, wherein each of the predetermined scanning lines corresponds to an addition of picture line to a picture or a reduction from two picture lines to one picture line on a picture in order to compensate a difference between the number of scanning lines of the LCD and that of lines of the picture to be displayed. In the control circuit 40, a circuit 45 detects cycle times of the vertical and horizontal sync pulses, a MPU 46 determines the reference value REF on the basis of the detected value and count CH of the horizontal sync pulse *HS from a counter 44, and a circuit 47 generates a signal AE which makes the time when the pulse count CD of pixel clock CLKD from the counter 42 becomes equal to the REF coincide with the timing of the rear edge of scanning pulse.
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Citations
13 Claims
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1. A liquid crystal display apparatus, comprising:
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an active matrix type liquid crystal panel in which potentials of respective data lines are applied to respective display electrodes of a selected display line via respective switching devices of said selected display line, said selected display line corresponding to a selected one of scanning lines;
a data driver for applying said potentials to said respective data lines and renewing said potentials at every horizontal cycle;
a scanning driver for providing scanning pulses to said respective scanning lines in line-sequence; and
a control circuit for causing a timing of the rear edge of a scanning pulse provided to a predetermined scanning line to coincide with a time when said potentials of said data lines is renewed, wherein said predetermined scanning line is one corresponding to an addition of picture line to or a reduction of picture line from a picture to be displayed, in order to compensate a difference between the number of said scanning lines and that of picture lines of said picture to be displayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control circuit for use in a liquid crystal display apparatus, said control circuit causing a timing of the rear edge of a scanning pulse provided to a predetermined scanning line to coincide with a time when potentials of data lines is renewed,
wherein said predetermined scanning line is one corresponding to an addition of picture line to or a reduction of picture line from a picture to be displayed, in order to compensate a difference between the number of said scanning lines and that of picture lines of said picture to be displayed.
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10. A method of driving a liquid crystal display panel, comprising the steps of:
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providing an active matrix type liquid crystal panel in which potentials of respective data lines are applied to respective display electrodes of a selected display line via respective switching devices of said selected display line, said selected display line corresponding to a selected one of scanning lines;
applying said potentials to said respective data lines and renewing said potentials at every horizontal cycle;
providing scanning pulses to said respective scanning lines in line-sequence; and
causing a timing of the rear edge of a scanning pulse provided to a predetermined scanning line to coincide with a time when said potentials of said data lines is renewed, wherein said predetermined scanning line is one corresponding to an addition of picture line to or a reduction of picture line from a picture to be displayed, in order to compensate a difference between the number of said scanning lines and that of picture lines of said picture to be displayed. - View Dependent Claims (11, 12, 13)
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Specification