Auxiliary Switches for Gate Control Line Speed in Displays
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Solution Overview
Problem
Existing display devices, particularly organic electroluminescent (EL) displays, face challenges in efficiently controlling the gate control line to achieve faster switching times due to parasitic capacitance and resistance, which affects the display's ability to quickly transition between gray scale values, leading to suboptimal image rendering.
Innovation Solution
The implementation of auxiliary switches connected between the gate control line and an auxiliary power line, controlled by an auxiliary control line, allows for the application of an auxiliary voltage to enhance the turn-on rate of the gate control line, thereby reducing the rising and falling times of the gate control signal, and includes a controller to manage signals for the gate, power, and switch control lines to optimize the switching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional gate control line driving is used, then device complexity is low, but switching speed is insufficient due to parasitic capacitance and resistance
Solution Approach 1:
The gate control line is segmented into multiple sections, each with its own auxiliary switch. This segmentation allows independent control of different line segments, enabling faster voltage transitions in each segment while managing the overall complexity through modular organization.
Solution Approach 2:
Auxiliary switches are introduced as intermediary components between the gate control line and the power supply. These switches act as mediators that actively manage voltage transitions, overcoming the limitations of parasitic capacitance and resistance without fundamentally redesigning the entire display structure.
2Manufacturing precision
If auxiliary switches are added to improve switching speed, then image rendering quality improves, but device complexity increases
Solution Approach 1:
Auxiliary switches are strategically placed at specific locations along the gate control line where they provide the most benefit for gray scale accuracy. This localized approach ensures that image rendering quality is improved in critical areas without unnecessarily increasing complexity across the entire display.
Solution Approach 2:
Instead of providing one auxiliary switch per pixel, the invention uses fewer auxiliary switches that serve multiple pixels. This partial action approach achieves sufficient gray scale accuracy for the display while significantly reducing the complexity increase that would result from a one-to-one mapping.
3Productivity
If more auxiliary switches are used, then turn-on rate increases, but the number of control lines and complexity increase
Solution Approach 1:
Multiple auxiliary switches are controlled by a single shared control line, merging the control function for multiple switches into one signal line. This combining approach increases the turn-on rate by enabling multiple switches to operate simultaneously while avoiding the complexity increase that would result from individual control lines for each switch.
Solution Approach 2:
The auxiliary control line serves a universal function by controlling multiple auxiliary switches across different segments of the gate control line. This multi-functionality allows a single control line to manage the turn-on rate for multiple switches, improving productivity without proportionally increasing control line complexity.
Data Source
AI summary
A display device includes a plurality of pixels, a gate control line electrically connected to the pixels, an auxiliary power line isolated from the gate control line, and a number of auxiliary switches between the gate control line and the auxiliary power line. The at least one auxiliary switch is controlled by an auxiliary control line isolated from the auxiliary power line and the gate control line. The at least one auxiliary switch electrically connects the gate control line and the auxiliary power line.