Display Controller Driver IC Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active-matrix OLED devices experience image quality degradation due to variations in threshold voltages and deterioration of organic light-emitting diodes and driving transistors over time, leading to luminance variations and inaccurate sensing of these changes.
Innovation Solution
A controller and method that supply distinct voltages to driver ICs to detect and compensate for characteristic variations, using change values to adjust settings and prevent image quality degradation by accurately calculating and updating offset and gain values of Analog-to-Digital Converters (ADCs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If OLED devices are used to display images, then thin design and excellent viewing angle are achieved, but threshold voltage variations and transistor deterioration cause image quality degradation
Solution Approach 1:
The patent implements a feedback mechanism where the controller senses the voltage corresponding to the driving current flowing in the OLEDs through sensing lines, detects threshold voltage variations and transistor deterioration, and compensates by adjusting data signals based on the sensed values to maintain image quality
Solution Approach 2:
The OLED device performs self-diagnosis and self-compensation by incorporating sensing lines within the display panel structure, allowing the system to automatically detect and compensate for its own degradation without external intervention
2Measurement precision
If sensing is performed to detect threshold voltage variations, then compensation can be applied, but sensed values vary depending on time of use causing luminance variation
Solution Approach 1:
The patent performs preliminary sensing of threshold voltages and transistor characteristics before image display, stores the sensed values, and uses these pre-acquired characteristics for compensation during subsequent display operations to maintain luminance consistency
Solution Approach 2:
The system periodically re-senses threshold voltages and transistor characteristics at different times, updates the sensed values, and recalibrates compensation parameters to account for temporal variations in the OLED device characteristics
3Manufacturing precision
If multiple driver ICs are used to supply data signals, then display resolution is improved, but variations between driver ICs cause inaccurate sensing and image quality degradation
Solution Approach 1:
The patent applies local compensation by separately sensing and compensating for variations in each driver IC individually, rather than using a uniform compensation approach, thereby accounting for the specific characteristics of each driver IC to improve sensing accuracy
Solution Approach 2:
The system changes compensation parameters specific to each driver IC based on individually sensed characteristics, adjusting data signals according to the unique variations of each driver IC to maintain accurate sensing across all channels
Data Source
AI summary
The present embodiments may provide a display device that includes a display panel; a data driver configured to include a plurality of driver Integrated Circuits (ICs) configured to supply a data signal to the display panel and to be present on the display panel, and to have a first characteristic and a second characteristic corresponding to variation between at least two driver ICs among the plurality of driver ICs; and a controller configured to supply a first voltage and a second voltage to the data driver, to identify change values of the first characteristic and the second characteristic corresponding to the first voltage and the second voltage, and to change the first characteristic and the second characteristic corresponding to the change values, and may provide a method for operating the same.