Pixel Voltage Sensing for Display Compensation
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Solution Overview
Problem
Electronic display devices face challenges in achieving uniform color and luminance across pixels due to variations in manufacturing and ambient conditions, leading to inconsistent gray levels and visual artifacts.
Innovation Solution
A sensing system that interrupts the panel scan to determine the sensitivity properties of each pixel by applying a test voltage and adjusting the data voltage accordingly, using a pixel driving circuit with four inputs to pause and resume data transmission, allowing for real-time compensation of pixel variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manufacturing processes are simplified to reduce cost, then ease of manufacture is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring and storing sensitivity properties of each pixel before normal display operation. A test voltage is applied to each pixel during initialization, and the resulting current is measured to determine sensitivity properties. These properties are stored in memory and used to compensate for manufacturing variations during subsequent operation, allowing uniform display characteristics without requiring extremely precise manufacturing.
2Manufacturing precision
If pixel sensitivity variations are compensated through sensing and calibration, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by having each pixel automatically measure its own sensitivity properties during initialization. When a test voltage is applied, each pixel's current response is measured and used to calculate its own sensitivity property. This self-measurement approach eliminates the need for complex external measurement equipment and simplifies the overall system while achieving precise compensation for manufacturing variations.
Solution Approach 2:
The patent applies parameter changes by utilizing the electrical current parameter as a sensitive indicator of pixel sensitivity. By measuring the current response to a known test voltage, the system extracts sensitivity information that is then used to adjust operating parameters. This approach converts an electrical measurement into useful compensation data without requiring complex optical or mechanical measurement systems.
3Measurement precision
If panel scan is interrupted for sensing operations, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent applies periodic action by performing sensing operations at specific periodic intervals during the display refresh cycle. The panel scan is interrupted only during brief sensing periods when test voltages are applied and measurements are taken. Normal display operation resumes for the remaining pixels, and this periodic sensing approach is repeated each frame. This allows precise measurements to be obtained while minimizing disruption to overall display productivity.
Data Source
AI summary
A display device may include rows of pixels that may display image data on a display and a circuit. The circuit may perform a progressive scan across the rows of pixels to display the image data using a plurality of pixels, supply test data to a pixel of plurality of pixels that corresponds to a first row of the rows of pixels during one frame of the progressive scan, and initiate a sensing period for determining one or more sensitivity properties associated with the pixel based on the performance of the pixel with respect to the test data in response to receiving a pulse of a first global signal. The circuit may then end the sensing period in response to receiving a second global signal and resume the progressive scan across the rows of pixels to display the image data after the sensing period ends.