Subframe Controller Layout for Stable Gate Output in Displays
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Solution Overview
Problem
In high-temperature environments, current leakage from transistors in display apparatuses using low-temperature polycrystalline silicon and oxide transistors leads to an unintended increase in output voltage, causing abnormal displays during low-speed driving.
Innovation Solution
Incorporating a subframe controller between the gate driver and pixels, which is turned on during subframe periods to minimize the increase in output voltage by applying gate low voltage, thereby stabilizing the gate output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-temperature polycrystalline silicon and oxide transistors are used to improve low-speed driving efficiency, then power consumption is reduced, but current leakage occurs in high-temperature environments causing output voltage increase
Solution Approach 1:
A subframe controller is introduced as an intermediary component between the gate driver and the pixel array. This subframe controller actively compensates for the current leakage effect by controlling the gate signal timing and duration, thereby preventing the unintended output voltage increase while preserving the low-power benefits of oxide transistor usage
Solution Approach 2:
The patent modifies the operating parameters of the gate driver circuit by adjusting the gate signal width and timing based on temperature conditions. When high temperature is detected, the system dynamically changes the gate signal parameters to compensate for increased leakage current, maintaining stable output voltage despite the use of low-power oxide transistors
2Use of energy by moving object
If oxide transistors are used for low-speed driving, then power consumption decreases, but abnormal display occurs due to output voltage increase
Solution Approach 1:
The system implements a feedback mechanism where the actual output voltage and pixel response are monitored. Based on this feedback, the subframe controller adjusts the gate signal characteristics in real-time to prevent abnormal display conditions, ensuring that the low-power oxide transistor operation does not compromise display quality
3Reliability
If gate driver operates in high-temperature environment, then device functionality is maintained, but current leakage increases causing output voltage to rise
Solution Approach 1:
The subframe controller performs preliminary compensation actions by pre-adjusting the gate signal parameters before the leakage-induced voltage rise occurs. Temperature sensing and predictive adjustment algorithms modify the gate driving waveform in advance, preventing the harmful voltage increase before it affects pixel operation
Data Source
AI summary
A display apparatus includes an active area, an inactive area surrounding the active area, a pixel disposed in the active area, and a driver IC, a gate driver, a low-potential power supply line, a high-potential power supply line and a subframe controller disposed in the inactive area, wherein the subframe controller is disposed between the pixel and the gate driver.