OLED Dimming Control via Lookup Table Compensation
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Solution Overview
Problem
Organic light emitting display devices face issues with display stains due to threshold voltage distribution in transistors, leading to inefficient dimming operations and increased power consumption.
Innovation Solution
A method of controlling dimming operations in organic light emitting display devices by compensating image data using look-up tables for different dimming modes, adjusting current levels and pulse widths, and providing current-control voltages to transistors, which minimizes compensation errors and allows precise control of the emitting period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage distribution in transistors is not compensated, then device complexity is reduced, but display stains occur and manufacturing precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in lookup tables during device manufacturing. The threshold voltage distributions of transistors are measured and stored in lookup tables, allowing the system to retrieve appropriate compensation values during operation without complex real-time calculations, thus improving display uniformity while avoiding excessive computational complexity
Solution Approach 2:
The patent uses lookup tables as intermediary structures to bridge the gap between transistor characteristics and display output. These lookup tables store pre-computed compensation data that mediates between the raw transistor output and the required uniform display output, enabling precise compensation without direct complex control of each transistor
2Manufacturing precision
If dimming operation is not precisely controlled, then ease of operation is improved, but power consumption increases and manufacturing precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the emitting period adjustable and variable based on dimming mode requirements. The system dynamically changes the emitting period duration according to different dimming levels, allowing precise control of power consumption while maintaining operational flexibility. This dynamic adjustment enables the system to optimize power usage at different brightness levels
3Adaptability or versatility
If multiple dimming modes are not supported, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the dimming control into separate modes (first dimming mode and second dimming mode) with distinct characteristics. Each mode has its own specific emitting period settings and compensation parameters, allowing the system to handle different dimming requirements independently. This segmentation enables versatile dimming control while managing complexity through modular design
Solution Approach 2:
The patent uses parameter changes to support multiple dimming modes by varying key parameters such as emitting period duration and compensation values based on the selected mode. The system changes these parameters dynamically when switching between dimming modes, enabling adaptability to different display requirements without requiring fundamentally different hardware for each mode
Data Source
AI summary
A method of controlling a dimming operation of an organic light emitting display device that includes an organic light emitting element, a first transistor connected to a data line and a gate line, and a second transistor connected to the first transistor and the organic light emitting element, is provided. By the method, image data is compensated using a plurality of look-up tables respectively corresponding to a plurality of dimming modes, to be outputted compensation data. The compensation data are converted to a data voltage to be provided the organic light emitting element with the data voltage. A level of a current applied to the organic light emitting element is adjusted according to the dimming.