Shift Register Precharging for Display Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Gate Driver On Array (GOA) circuits using the dot inversion driving mode experience inconsistencies in charging between odd and even rows, leading to uneven brightness and increased power consumption due to the precharging mode corresponding to the column inversion driving mode.
Innovation Solution
A shift register and gate driving device with specific modules (input, reset, pull-up, control, pull-down, output gating, and output pull-down) are designed to manage clock signals and voltages, ensuring consistent precharging across rows by using reverse phase clock signals and control signals to synchronize the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the column inversion driving mode precharging method is used in dot inversion driving mode, then the circuit design is simplified, but charging inconsistency between odd and even rows occurs leading to brightness unevenness and increased power consumption
Solution Approach 1:
The patent applies local quality by differentiating the precharging control for odd and even rows. Specifically, the control module generates different precharging control signals for odd-row shift registers and even-row shift registers, allowing each row type to be precharged at appropriate times. This ensures that both odd and even rows achieve uniform brightness by addressing their charging needs locally rather than applying a uniform precharging approach to all rows.
2Device complexity
If the column inversion driving mode precharging method is used in dot inversion driving mode, then the circuit structure is simpler, but power consumption increases due to charging inconsistencies
Solution Approach 1:
The patent implements preliminary action by performing precharging operations at specific timing points before data writing. The control module generates precharging control signals that activate pull-up modules in odd-row shift registers during odd-row precharging periods and in even-row shift registers during even-row precharging periods. This timely precharging ensures that display elements are properly charged before data is written, reducing the need for compensatory power consumption and improving overall energy efficiency.
Data Source
AI summary
Embodiments of the present disclosure relate to a shift register and its driving method, a gate driving device and its driving method. The shift register comprises an input module, a reset module, a control module, a pull-up module, a pull-down module, an output gating module and an output pull-down module. The input module can provide an input signal to the pull-up control node according to the input signal. The reset module can provide a first voltage signal to the pull-up control node according to a reset signal. The pull-up module can provide a first clock signal to the cascade node according to the voltage of the pull-up control node. The control module can control the voltage of the pull-down control node according to the second clock signal and the voltage of the pull-up control node.