Display Driving Controller with Pixel-Level Luminance and Heat Compensation
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Solution Overview
Problem
Existing display technologies face challenges in maintaining consistent display quality due to location-specific process deviations in transistors and light emitting elements, leading to variations in heat generation and luminance across different areas of the display.
Innovation Solution
The implementation of a control unit that utilizes multiple maps to compensate for location-specific deviations in transistors and light emitting elements by adjusting current values, voltages, and heat generation characteristics, using a memory to store maps that account for these variations and a driving controller to generate image data considering these factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If location-specific process deviations are not compensated, then device complexity is reduced, but display quality and luminance consistency deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing correction values for each pixel's transistor parameters (threshold voltage, mobility, on-current) in lookup tables before the display operates. When driving the display, the controller retrieves these pre-computed correction values based on the pixel location and applies them to compensate for process deviations, eliminating the need for real-time complex calculations while maintaining high display quality.
Solution Approach 2:
The patent implements local quality by applying location-specific correction values to each pixel based on its unique position in the display array. Different regions of the display receive tailored compensation parameters stored in separate lookup tables, allowing each pixel to be optimized for its specific location rather than using a uniform correction approach, thereby improving overall luminance consistency.
2Manufacturing precision
If multiple maps storing correction values are stored in memory, then manufacturing precision is improved, but device complexity and memory requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the correction data into multiple separate lookup tables, each storing correction values for a specific transistor parameter (threshold voltage, mobility, on-current) or specific display region. This segmented organization allows the memory system to efficiently store and retrieve only the necessary correction data for each pixel type, reducing overall memory complexity compared to storing all corrections in a single large table.
3Reliability
If heat generation characteristics are compensated, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by measuring the actual heat generation characteristics of the display during operation and using this information to adjust the driving currents dynamically. The control unit monitors temperature-related parameters and modifies the compensation values in real-time based on the observed thermal behavior, creating a closed-loop system that improves reliability without requiring overly complex predictive models.
Data Source
AI summary
Disclosed is an electronic device including a display layer which includes an active area for displaying an image and a peripheral area disposed adjacent to the active area, pixels each of which includes a driving transistor and a light emitting element, a memory that stores a plurality of maps, a driving controller connected to the memory and including a control unit. The plurality of maps includes a first map, a second map, and a third map. The control unit includes a first current output unit that outputs the first current value corresponding to the data voltage based on the first map, a voltage output unit that outputs the voltage based on the second map, and a heat generation characteristic output unit that outputs the power based on the third map and outputs a heat generation characteristic for each location within the active area based on the power.