Display Panel Temperature Mapping for Uniform Luminance
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Solution Overview
Problem
Display devices experience non-uniform temperature distribution due to the presence of components like timing controllers, data drivers, and application processors, leading to non-uniform image luminance.
Innovation Solution
A display device is partitioned into blocks with temperature sensors to measure ambient and panel temperatures, using lookup tables to calculate pixel temperatures, and a dimming unit to adjust input data based on temperature and dimming levels for uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drivers (timing controller, data driver, application processor) are located on the rear surface of the display unit, then the display device can be driven properly, but non-uniform temperature distribution occurs leading to non-uniform image luminance
Solution Approach 1:
The display unit is divided into multiple blocks (first block, second block, third block, fourth block) corresponding to different driver locations. Each block has its own temperature characteristics and compensation parameters, allowing independent temperature management for each region affected by specific drivers.
Solution Approach 2:
Different compensation values are applied to different blocks of the display unit based on their specific temperature characteristics. The timing controller adjusts data signals with block-specific compensation values to counteract the non-uniform temperature distribution caused by drivers located at different positions.
2Temperature
If temperature compensation is applied to each position of the display unit, then uniform image luminance can be displayed, but the device complexity increases due to multiple lookup tables and temperature calculations
Solution Approach 1:
Lookup tables storing compensation values for different temperature conditions are pre-generated and stored in the timing controller. During operation, the timing controller only needs to retrieve the appropriate compensation values from these pre-computed tables based on measured temperature, avoiding complex real-time calculations.
Solution Approach 2:
Complex temperature compensation calculations are replaced by lookup table retrieval operations. Instead of performing complex mathematical computations to determine compensation values, the system uses simple table lookups based on temperature measurements, significantly reducing computational complexity.
Data Source
AI summary
A display device includes: a display unit including pixels connected to data lines and scan lines, the display unit being partitioned into a plurality of blocks; at least one driver overlapping with the display unit in a plan view, where the at least one driver is configured to drive the display unit; a temperature sensor for generating an ambient temperature value; and a timing controller for generating a panel temperature value corresponding to an actual temperature of the display unit by using the ambient temperature value, and generating pixel temperature values corresponding to temperatures of the pixels, respectively, by using the panel temperature value. The timing controller is supplied with input data, and generates output data by reflecting the pixel temperature value on the input data.