AMOLED Display Non-Uniformity Compensation via Optical Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active matrix organic light emitting diode (AMOLED) displays face non-uniformities due to structural and random variations, which affect image quality and pixel density, as existing compensation techniques require additional transistors and lines for monitoring, leading to decreased pixel pitch and insufficient uniformity correction.
Innovation Solution
A system that uses image sensors and optical measurements to extract and quantify structural and low-frequency non-uniformities across the display panel, modifying input signals to compensate for these variations, and applying patterns to create a compensated image, thereby improving image uniformity without the need for additional transistors or lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If monitoring systems with additional transistors and lines are used to measure time dependent parameters for compensation, then image uniformity is improved, but pixel pitch decreases
Solution Approach 1:
The patent introduces an intermediary measurement system that uses external optical sensors and test patterns to measure pixel output characteristics without requiring additional transistors or conductive lines within the pixel structure itself. This mediator approach allows compensation data to be extracted through optical measurement of the light emitted by pixels during test pattern display, thereby maintaining pixel pitch while achieving uniformity compensation
Solution Approach 2:
The patent replaces the electrical/mechanical measurement system (additional transistors and conductive lines for in-pixel sensing) with an optical measurement system. By using external optical sensors to detect the light output of pixels during test pattern display, the system substitutes the physical electrical measurement infrastructure with an optical characterization approach, thereby preserving pixel pitch while enabling compensation measurements
2Measurement precision
If additional transistors and lines are incorporated for monitoring and compensation, then compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary optical measurement system as a mediator between the display and the compensation process. Instead of complicating the pixel structure with additional transistors and sensing lines, the system introduces external optical sensors and processing equipment that measure pixel output during test pattern display, thereby achieving accurate compensation measurements without increasing the complexity of the display device itself
Solution Approach 2:
The patent extracts the measurement function from the pixel structure itself and relocates it to an external system. By removing the requirement for in-pixel sensing transistors and conductive lines, the measurement capability is extracted and implemented through external optical equipment that characterizes pixel output during test pattern display, thereby reducing device complexity while maintaining measurement precision
3Ease of manufacture
If structural non-uniformities are not compensated, then manufacturing simplicity is maintained, but image quality deteriorates
Solution Approach 1:
The patent applies preliminary characterization of structural non-uniformities through optical measurement during manufacturing or initialization. By measuring and storing compensation data for each pixel's structural variations before normal operation, the system enables subsequent compensation during image display without adding complexity to the manufacturing process itself, thereby maintaining manufacturing simplicity while improving image quality
Solution Approach 2:
The patent compensates for structural non-uniformities by dynamically adjusting display parameters (such as pixel drive currents or voltages) based on pre-measured compensation data. By changing these operational parameters according to stored compensation information, the system corrects structural variations and improves image quality without modifying the physical structure or manufacturing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively compensates for non-uniformities, enhancing image quality and maintaining high pixel density by interpolating response curves and adjusting pixel values, resulting in improved display performance and increased yield.
Implementation Method 1
extracts the outputs of a pattern based structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities
Data Source
AI summary
A system for compensating for non-uniformities in an array of solid state devices in a display panel displays images in the panel, and extracts the outputs of a pattern based on structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities. Then the structural non-uniformities are quantified, based on the values of the extracted outputs, and input signals to the display panel are modified to compensate for the structural non-uniformities. Random non-uniformities are compensated by extracting low-frequency non-uniformities across the panel by applying patterns, and taking images of the pattern. The area and resolution of the image are adjusted to match the panel by creating values for pixels in the display, and then low-frequency non-uniformities across the panel are compensated, based on the created values.