LED Display Degradation Compensation via Overdrive Voltage Mapping
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Solution Overview
Problem
Light emitting diode (LED) displays experience performance degradation over time, leading to reduced color intensity and accuracy, as different colors of LEDs age at different rates, causing uneven luminosity and color discrepancies across pixels.
Innovation Solution
Implementing a degradation compensating overdrive data table that uses additional bits to convey LED degradation information, allowing for increased driving voltages to maintain intended color states, even as LEDs age, thereby compensating for individual pixel and inter-pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional overdrive bits are used to compensate for LED degradation, then color accuracy and brightness are maintained, but device complexity increases
Solution Approach 1:
The patent embeds degradation compensation information within the existing pixel data structure by utilizing overdrive bits that are already present in the display system. The additional degradation data is nested within the same data pathway and processing architecture, avoiding the need for separate hardware systems while maintaining color accuracy despite LED aging.
2Illumination intensity
If overdrive voltage is increased to compensate for degradation, then luminosity is maintained, but energy consumption increases
Solution Approach 1:
The patent applies overdrive voltage selectively and partially - only to the extent necessary to compensate for measured LED degradation. Rather than continuously applying maximum overdrive voltage, the system adjusts the overdrive level based on actual degradation data stored in the LUT, applying just enough additional voltage to maintain luminosity while minimizing unnecessary energy consumption.
3Manufacturing precision
If individual pixel degradation is tracked and compensated, then image quality is maintained, but processing requirements increase
Solution Approach 1:
The patent performs degradation compensation in advance by pre-calculating and storing correction values in a lookup table (LUT) during manufacturing or initial operation. The system characterizes each pixel's degradation profile beforehand and stores the compensation data, allowing rapid retrieval and application during normal display operation without requiring complex real-time processing for each pixel.
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
This approach ensures that LED displays can maintain the full range of color states from new to aged conditions without sacrificing brightness or color accuracy, by adjusting voltages based on LED degradation, thus extending the display's lifespan and maintaining image quality.
Implementation Method 1
Individual pixels can be illuminated by one or more independently controllable light emitting diodes (LEDs). The LEDs can be designed to be driven at a range of voltages to produce defined color intensity values
Implementation Method 2
light emitting diodes (LEDs)
Data Source
AI summary
The description relates to display devices. One example can receive a first frame rendering that expresses color content with a defined number of bits that convey a set of color states that correspond to a first range of voltages for driving light emitting diodes (LEDs) of a display. The example can obtain information about degradation of the LEDs of the display. The example can also combine the defined number of bits that express the color content with additional degradation compensation overdrive bits relating to compensating for the degradation of the LEDs of the display. The example can map the combined defined number of bits and the additional degradation compensation overdrive bits to a second range of voltages for driving the display where individual values of the second range exceed the first range.