Pixel Gate Initialization Circuit for Transistor Compensation
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Solution Overview
Problem
Existing display devices face challenges in efficiently initializing and compensating transistors within pixels, leading to inefficiencies in hysteresis and initialization voltage operations, which can complicate the circuit structure and increase the size of the gate driver.
Innovation Solution
A display device with a dual or triple-gate formation structure for transistors, where pixels on the same horizontal line initialize and compensate transistors using gate initialization signals, reducing the need for additional control signal generation and input lines, thereby simplifying the gate driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate control signal lines are added for hysteresis improvement and initialization voltage input operations, then transistor control precision is improved, but gate driver circuit complexity and size increase
Solution Approach 1:
The patent combines the hysteresis improvement operation and initialization voltage input operation into a single control signal line. The gate driver generates a unified gate initialization signal that simultaneously performs both functions, eliminating the need for separate control signal lines while maintaining precise transistor control.
Solution Approach 2:
The gate initialization signal is designed to serve multiple functions: it initializes the gate electrode, first electrode, and second electrode of the first transistor, improves hysteresis characteristics, and provides initialization voltage input. This multi-functional signal reduces the number of required control lines and simplifies the gate driver circuit.
2Measurement precision
If multiple control signal operations are performed separately, then transistor initialization and compensation accuracy is improved, but processing time increases
Solution Approach 1:
The gate initialization signal is generated in advance and applied to the transistor before the emission signal is supplied. This preliminary initialization ensures that the transistor is properly prepared with correct voltage levels and hysteresis characteristics, enabling accurate compensation operations to be performed more efficiently when the emission signal arrives.
Solution Approach 2:
The gate initialization signal maintains continuous control over the transistor states throughout the operation sequence. By keeping the transistor properly initialized and compensated through continuous signal management rather than discrete separate operations, the system achieves both high accuracy and reduced processing time.
Data Source
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AI summary
A display device includes: a display panel in which pixels are arranged in a display area to display an image; and a gate driver configured to supply gate scan signals to the pixels on a horizontal line-by-horizontal line basis, wherein from among the pixels, pixels that are on a same horizontal line along each gate line are configured to initialize a gate electrode, a first electrode and a second electrode of a first transistor to an emission initialization voltage in response to a previous gate initialization signal supplied to pixels of a previous horizontal line and a current compensation gate signal from among the gate scan signals in a first period, to initialize the second electrode of the first transistor to an initialization voltage in response to a current gate initialization signal and the current compensation gate signal from among the gate scan signals in a second period.