Pixel TFT Temperature Compensation for Uniform Display Luminance
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Solution Overview
Problem
Display devices experience luminance deviation between image display pixels due to temperature changes, affecting image quality, as characteristics of switching elements like thin film transistors vary with temperature.
Innovation Solution
A display device with a display driving circuit that supplies an active control voltage varying proportional or inversely proportional to temperature changes to thin film transistors, adjusting the voltage or current to minimize luminance deviation and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display device operates without temperature compensation, then the device complexity is reduced, but luminance deviation between pixels increases due to temperature changes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the active control voltage based on temperature variations. The display driving circuit modifies the voltage parameter supplied to the thin film transistor's active layer in response to temperature changes, thereby compensating for temperature-induced characteristics variations and reducing luminance deviation without requiring complex structural modifications
Solution Approach 2:
The patent implements feedback control by monitoring temperature changes and adjusting the active control voltage accordingly. The display driving circuit receives temperature information and dynamically modifies the voltage supplied to the thin film transistor, creating a closed-loop system that automatically compensates for temperature effects and maintains consistent pixel luminance
2Manufacturing precision
If the active control voltage is adjusted to compensate for temperature changes, then luminance deviation is reduced, but the device complexity increases
Solution Approach 1:
The patent achieves universality by enabling the display driving circuit to perform multiple functions: it not only drives the display pixels but also simultaneously performs temperature compensation by adjusting the active control voltage. This multi-functionality allows the same circuit to handle both normal display operation and temperature compensation without requiring separate dedicated compensation circuits
Solution Approach 2:
The patent uses parameter changes to compensate for temperature effects by dynamically adjusting the voltage parameter. The display driving circuit modifies the active control voltage level based on temperature conditions, thereby correcting luminance deviation through electrical parameter adjustment rather than physical structural changes
Data Source
AI summary
A display device includes a plurality of pixels arranged in a display area of a display panel, and a display driving circuit supplying data voltages and pixel driving control signals to the plurality of pixels to control an image display operation for each of the plurality of pixels. The display driving circuit further supplies an active control voltage that varies proportional to or inversely proportional to a change in temperature of the display panel to at least one thin film transistor included in the plurality of pixels.