Electro-optical devices and electronic equipment
The pixel circuit with switches and a level shift circuit addresses high parasitic capacitance in liquid crystal elements, reducing power consumption and maintaining display quality through AC driving.
JP2026090846APending Publication Date: 2026-06-03SEIKO EPSON CORP
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SEIKO EPSON CORP
- Filing Date
- 2024-11-22
- Publication Date
- 2026-06-03
AI Technical Summary
Technical Problem
The common electrode in liquid crystal elements has high parasitic capacitance, leading to increased power consumption and adverse effects on display quality due to voltage switching.
Method used
A pixel circuit with a liquid crystal element sandwiched between a pixel electrode and a common electrode, incorporating first and second switches and a level shift circuit to level shift the data signal voltage during specific periods.
Benefits of technology
Reduces power consumption and maintains display quality by suppressing data signal voltage amplitude while keeping the common electrode voltage constant, allowing AC driving of liquid crystal elements.
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Smart Images
Figure 2026090846000001_ABST
Abstract
The voltage Vcom of the common electrode 108 is kept constant while suppressing the voltage amplitude range of the data signal. [Solution] The pixel circuit includes a liquid crystal element 120 in which liquid crystal is sandwiched between a pixel electrode 118 and a common electrode 108, and a transistor 116 provided between the pixel electrode 118 and a data line 14 to which a data signal is supplied; a transistor 52 switch provided between a terminal 17 that receives the input of a data signal and the data line; and a level shift circuit 62 that level shifts the voltage of the data signal supplied to the data line 14 during the period when the transistor 116 is ON, to the period when the transistor 52 is OFF.
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