Liquid crystal display device capable of reducing afterimage attributed to change in dielectric constant at time of response of liquid crystals
US6476786B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Dec 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a liquid crystal display device capable of displaying every frame an image that is not influenced by the previous frame at all by removing an afterimage attributed to a change in dielectric constant at the time of response of liquid crystals. A scanning line GL1 is made to have a voltage of +15 V so as to turn on first and third TFT elements 1 and 3 constructed of an n-type MOS transistor and turn off a second TFT element 2 constructed of a p-type MOS transistor. A signal voltage Vs is applied to a memory capacitance Cm via the first TFT element 1, charging the memory capacitance Cm up to the signal. voltage Vs. Simultaneously with this operation, electric charges of a pixel capacitance Cp are discharged via the third TFT element 3. The other scanning lines GL2, GL3, . . . all have a voltage of −15 V, and the second TFT element 2 is turned on, consequently moving the electric charges accumulated in the memory capacitance Cm to the pixel capacitance Cp and varying the alignment state of the liquid crystals according to a change in voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.