Display Panel Voltage Setting for Transistor Leakage Control
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Solution Overview
Problem
Insufficient gate-source voltage margin in transistors leads to leakage currents in display devices, deteriorating display quality.
Innovation Solution
A method of setting a panel voltage by applying reference voltages and currents to measure and adjust the gate-source voltage of transistors, minimizing leakage currents through transistors by determining a panel setting voltage based on measured currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the panel default voltage is used, then the device complexity is reduced, but leakage current increases due to insufficient gate-source voltage margin
Solution Approach 1:
The patent dynamically adjusts the panel voltage parameter based on measured leakage current characteristics. By changing the voltage from a fixed default value to an optimized setting voltage determined through measurement and calculation, the system reduces leakage current while managing the added complexity of the voltage adjustment process.
Solution Approach 2:
The patent implements a feedback mechanism where the actual current is measured, compared with a reference current, and used to determine whether voltage adjustment is necessary. This feedback loop enables automatic optimization of the panel voltage to minimize leakage current while maintaining manageable system complexity through automated control.
2Reliability
If the gate-source voltage margin is increased, then leakage current is reduced, but the display quality may deteriorate due to insufficient voltage headroom
Solution Approach 1:
The patent optimizes the gate-source voltage by dynamically adjusting the panel voltage setting based on measured current characteristics. This parameter adjustment finds the optimal balance point where leakage current is minimized while maintaining sufficient voltage margin for proper display operation, thereby improving both reliability and display quality.
Solution Approach 2:
The patent replaces fixed voltage operation with a measured and calculated voltage optimization approach. By substituting the mechanical/fixed voltage system with an electronically controlled adaptive voltage system based on current measurement and reference comparison, the system achieves better control over leakage current while preserving display quality through precise voltage tuning.
Data Source
AI summary
A method includes setting a first reference voltage, a second reference voltage lower than the first reference voltage and higher than a panel default voltage, and a reference current, applying the first reference voltage to the pixels, obtaining a first measurement current by measuring a current of the display panel generated in response to the first reference voltage, comparing the first measurement current with the reference current, obtaining a second measurement current by measuring a current of the display panel generated in response to the second reference voltage when the first measurement current is greater than the reference current, comparing the second measurement current with the reference current, and obtaining a panel setting voltage based on the first reference voltage and the second reference voltage when the second measurement current is less than or equal to the reference current.