LIQUID CRYSTAL DISPLAY DEVICE

• Main Author: YAMADA YUMIKO
• Format: Patent
• Language: English
• Published: 12.04.1996
• Edition: 6
• Subjects: 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

PURPOSE: To provide a high contrast with good display property without causing white or black collapse by making gradient voltage with lowest gradient data output from a gradient data signal control means larger than voltage where the light transmissivity of a liquid crystal layer begins to chage, when a gradation is displayed by using a FRC drive method. CONSTITUTION: A scanning electrode drive means 2 and a scanning electrode drive means control circuit 6 to output a gate voltage to a scanning electrode, a signal electrode drive means 4 and a signal electrode drive means control circuit 7 to output a N-bit gradation of gradient voltage on a signal electrode and a gradient data signal control means driven by an opposite electrode drive means 5 and an opposite electrode drive means control circuit 8 to output gradient data 12 to a signal electrode drive means 3 are provided. The dradient voltage for lowest gradient data 12 output from a gradient data signal control means 9 is made larger than voltage (Vc) where the light transmissivity of a liquid crystal layer begins to change.