2T1C Pixel Control Method for High-Speed Rewriting
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Solution Overview
Problem
2T1C-type pixels in electro-optic devices face challenges in rewriting pixels at high speed due to their limited ability to control pixel states in accordance with other pixels, leading to increased power consumption and reduced rewriting speed compared to 1T1C-type pixels.
Innovation Solution
A control method is introduced that includes a memory circuit, switching circuit, and scanning line driving circuit to determine specific conditions among pixels and apply appropriate voltages to control the conduction state of the switching circuit, allowing for faster rewriting and reduced power consumption by selectively applying voltages to scanning lines based on pixel states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 2T1C-type pixel configuration is used, then the pixel can execute only one of rewriting from black to white or rewriting from white to black when scanning lines are selected, but the rewriting speed is reduced and power consumption increases compared to 1T1C-type pixels
Solution Approach 1:
The patent applies dynamic control by making the switching circuit's conduction state controllable based on pixel type. The control device determines whether each pixel is a first-kind or second-kind pixel and dynamically adjusts the switching circuit accordingly, allowing the system to adapt its behavior to achieve high-speed rewriting for both pixel types without the limitations of static 2T1C configuration
Solution Approach 2:
The patent implements local quality by applying different voltages to different signal lines based on the specific pixel type. First-kind pixels receive a first voltage that maintains switching circuit conduction, while second-kind pixels receive a second voltage that controls conduction state, allowing each pixel type to be optimized independently for high-speed rewriting
2Reliability
If 2T1C-type pixel configuration is used, then the pixel structure provides memory function and optical state control, but the number of writes is larger leading to increased power consumption
Solution Approach 1:
The patent changes the voltage parameter dynamically based on pixel type and rewriting direction. By applying a first voltage to maintain conduction for first-kind pixels and a second voltage for second-kind pixels, the system optimizes power consumption while maintaining the necessary memory function and optical state control capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables faster rewriting of 2T1C-type pixels and reduces power consumption by optimizing voltage application, achieving performance comparable to 1T1C-type pixels while addressing the limitations of 2T1C-type pixels.
Implementation Method 1
an electro-optic element which enters a first optical state from a second optical state for a first time by accumulatively applying a first voltage via the pixel electrode during a first plurality of periods
Implementation Method 2
a switching circuit which is disposed in each of the plurality of pixels, includes a control input terminal connected to the first output terminal, a third input terminal connected to a power voltage line, and a second output terminal connected to the pixel electrode, and controlling a conduction state between the third input terminal and the second output terminal
Data Source
AI summary
A driving method of an electro-optic device includes determining which condition is satisfied among a plurality of conditions including a first condition where a plurality of pixels include only a first pixels of which an optical state is changed from a second optical state to a first optical state and a third pixels of which the optical state is not changed, a second condition where the plurality of pixels include only a second pixels of which the optical state is changed from the first optical state to the second optical state and the third pixels, and a third condition where the plurality of pixels include both the first pixels and the second pixels, based on data stored in a memory storing the data indicating the optical state of the plurality of pixels.