METHOD AND APPARATUS FOR DRIVING LIQUID CRYSTAL DISPLAY PANEL

METHOD AND APPARATUS FOR DRIVING LIQUID CRYSTAL DISPLAY PANEL

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 pi...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: KAI TSUTOMU, KANEKO YOSHIYA
Format: Patent
Sprache:eng
Schlagworte:
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DISPLAY
EDUCATION
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
SEALS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung: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.