Electro-optical device, driving circuit and driving method of electro-optical device, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorTokuro Ozawa
Life of this patent
Estimating the term…
Abstract
Lamp wave signals are supplied to signal supply lines via switches. The switches are turned ON when their corresponding scanning lines are selected. Hence, a load on the driving circuit for the lamp wave signals will be a parasitic capacitance that comes from a single signal supply line. PWM signals of having pulse widths based on image data are supplied to data lines. A TFT supplies PWM signals to a gate electrode of a TFT when a corresponding scanning line is selected; therefore, the lamp wave signal is applied to a pixel electrode via the TFT when the data line and the scanning line simultaneously become active.
Claims13
A driving method of an electro-optical device provided with a plurality of data lines, a plurality of scanning lines, pixel electrodes corresponding to intersections of said scanning lines and said data lines, and a plurality of signal supply lines corresponding to the scanning lines, the method comprising the steps of:
- supplying scanning signals respectively for sequentially selecting said scanning lines;
- sequentially supplying reference signals to the signal supply lines synchronously when said scanning signals become active;
- supplying pulse width modulation signals respectively that are active only during a period corresponding to a gray scale value indicated by image data to each of the data lines;
- and
- capturing reference signals from the signal supply lines corresponding to pixels, and applying the captured reference signals to said pixel electrodes during a period in which the scanning lines and the data lines corresponding to the pixels simultaneously become active at said pixels corresponding to intersections of said scanning lines and said data lines, while holding voltages of the pixel electrodes during a period in which either the scanning lines or the data lines corresponding to said pixels become inactive.
An electro-optical device composed of a pair of substrates with an electro-optical material sandwiched therebetween, comprising on one of the substrates:
- a plurality of data lines;
- a plurality of scanning lines;
- a plurality of pixel electrodes provided in association with intersections of the scanning lines and the data lines;
- a plurality of signal supply lines corresponding to the scanning lines;
- a signal supply circuit that selects one signal supply line of said signal supply lines that has its corresponding scanning line in an active state, and that supplies a reference signal to the selected signal supply line;
- and
- voltage holding circuits that are provided respectively in association with the intersections of said scanning lines and said data lines, and that capture said reference signals from the signal supply lines corresponding to pixels, and that apply the captured reference signals to said pixel electrodes during a period in which the scanning lines and the data lines corresponding to the pixels simultaneously become active, while holding voltages of said pixel electrodes during a period in which one of corresponding scanning lines or data lines become inactive.
Dependencies are inferred from the claim text.