Data Driving Circuit Thermal Management via Dynamic Gamma Power Control
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Solution Overview
Problem
As display devices, particularly organic light emitting displays, increase in size and resolution, the temperature of the data driving circuit and display panel rises due to frequent transitions of image data, degrading image quality.
Innovation Solution
A display device with a data driving circuit that includes a gamma driving power detection circuit to measure and control the gamma driving power, adjusting the data voltage level or refresh rate to mitigate temperature increases, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the area and resolution of the display panel are increased, then the display performance is enhanced, but the temperature of the data driving circuit and display panel rises due to frequent image data transitions
Solution Approach 1:
The patent applies dynamics by making the data voltage level dynamic rather than fixed. The system automatically adjusts the data voltage level based on the detected image data transition frequency, using multiple voltage levels (first, second, and third levels) to adapt to different operating conditions. This dynamic adjustment resolves the contradiction by allowing high resolution and performance while controlling temperature through adaptive voltage modulation.
Solution Approach 2:
The patent changes the parameter of data voltage level based on the transition frequency of image data. By detecting whether the transition frequency exceeds a reference value and accordingly selecting different voltage levels, the system modifies the electrical parameters to balance performance and thermal management, directly addressing the temperature issue while maintaining display quality.
2Productivity
If the transition of image data is increased, then the display updates more frequently, but the temperature of the data driving circuit rises degrading image quality
Solution Approach 1:
The patent implements feedback by detecting the transition frequency of image data and using this information to control the data voltage level. The detection unit monitors image data changes, and based on whether the transition frequency exceeds a reference value, the control unit adjusts the voltage level accordingly. This closed-loop feedback mechanism ensures that productivity (update frequency) can be maintained while protecting reliability (image quality) by preventing excessive temperature rise.
3Illumination intensity
If the data voltage level is increased to improve display brightness, then the luminance is enhanced, but the temperature of the data driving circuit increases
Solution Approach 1:
The patent makes the data voltage level dynamic, switching between first, second, and third levels based on operating conditions. When image data transition frequency is high, the system selects lower voltage levels to reduce temperature, while still maintaining adequate luminance through the third level voltage option. This dynamic voltage selection resolves the contradiction between luminance enhancement and temperature control.
Solution Approach 2:
The patent changes the voltage level parameter adaptively rather than using a fixed high voltage. By selecting from multiple voltage levels based on transition frequency detection, the system optimizes the balance between luminance output and thermal generation, allowing luminance enhancement when needed while controlling temperature through lower voltage levels during high-activity periods.
Data Source
AI summary
A display device includes a gamma driving power detection circuit for detecting the gamma driving power for driving the data driving circuit and may control digital image data supplied to the data driving circuit according to the gamma driving power measurement detected by the gamma driving power detection circuit, thereby reducing an increase in the temperature of the data driving circuit and enhancing image quality.