Current Limit Circuit for Display Device Partition Areas
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Solution Overview
Problem
In organic light emitting displays, high-luminance images lead to excessive current flow, causing increased power consumption and heat generation, particularly when high-gray-scale data is applied to specific areas, resulting in decreased display quality.
Innovation Solution
A current limit circuit is implemented to partition the pixel unit into areas corresponding to power supply inlet portions, calculating and limiting current values based on gray scale data, using a conversion unit, calculation unit, comparison unit, and correction coefficient regulation to control luminance by adjusting data and scan control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-luminance images are displayed, then display quality is improved, but power consumption increases and heat generation occurs
Solution Approach 1:
The pixel unit is divided into multiple partition areas corresponding to different power supply inlet portions. Current values are calculated separately for each partition area, allowing localized current management. This segmentation enables precise control of power consumption in high-luminance regions without affecting the entire display, thus reducing overall power consumption while maintaining high luminance where needed.
2Illumination intensity
If high-luminance images are displayed, then display quality is improved, but heat generation increases
Solution Approach 1:
By dividing the pixel unit into partition areas and calculating current values for each area separately, the system can identify and control heat-generating regions. The correction coefficient is applied selectively to partition areas with excessive current, thereby reducing heat generation in specific high-luminance regions while maintaining overall display quality.
3Use of energy by moving object
If current is limited to reduce power consumption, then power consumption is reduced, but luminance control precision decreases
Solution Approach 1:
The correction coefficient is applied differently to different partition areas based on their specific current values and luminance requirements. Areas with excessive current receive stronger correction, while areas within normal ranges maintain their original luminance characteristics. This localized quality approach preserves luminance control precision in critical regions while achieving overall power consumption reduction.
4Measurement precision
If the pixel unit is partitioned into multiple areas, then current control precision is improved, but device complexity increases
Solution Approach 1:
The current limit circuit performs multiple functions: it divides the pixel unit into partition areas, calculates current values for each area, compares them against reference ranges, and applies correction coefficients. This multi-functional approach achieves precise current control without requiring separate dedicated circuits for each function, thereby limiting the increase in device complexity while maintaining high measurement precision.
Data Source
AI summary
A display device includes a scan driver, a data driver, a power supply unit configured to supply power through a plurality of power supply inlet portions, a pixel unit including a plurality of pixels that receives scan signals, emission control signals, data signals and the power so as to display an image, the pixel unit being partitioned into a plurality of partition areas to correspond to the respective power supply inlet portions, and a current limit circuit configured to calculate values of current for each of the partition areas based on gray scale data of an image signal, and configured to correct the gray scale data so as to limit luminance of the pixel unit when at least one of the values of current for each partition area is a reference value or more.