Gamma Voltage Generator for Display Pixel Degradation Compensation
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Solution Overview
Problem
Conventional display devices face challenges in maintaining display quality due to degradation of pixels, leading to a need for compensating gamma voltages beyond the maximum level, which results in decreased grayscale resolution and luminance when adjusting reference voltages or performing data remapping.
Innovation Solution
A gamma voltage generator that selects a compensating gamma tab voltage greater than the maximum gamma tab voltage, expanding the range of gamma voltages by using a reference gamma selector, gamma tab generator, and maximum gamma compensator to output gamma voltages corresponding to a gamma curve without resolution loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reference voltages are adjusted or data remapping is performed to compensate for pixel degradation, then the maximum gamma voltage level is increased, but the grayscale resolution is decreased
Solution Approach 1:
The patent divides the voltage generation into two independent segments: a gamma voltage generator that produces standard gamma voltages with full grayscale resolution, and a separate compensating voltage generator that produces additional compensating voltages. This segmentation allows each segment to operate independently without compromising the other's resolution, thereby resolving the contradiction between increasing maximum voltage level and maintaining grayscale resolution.
Solution Approach 2:
The patent introduces a new dimension by adding compensating voltages that are separate from the original gamma voltage sequence. Instead of stretching the existing gamma voltage range (which would reduce resolution), the invention adds an additional voltage dimension through compensating voltages, allowing the maximum luminance to be increased while preserving the original grayscale resolution of the gamma voltages.
2Illumination intensity
If the voltage range of gamma voltages is expanded to compensate for pixel degradation, then the maximum luminance level is increased, but the display quality may decrease due to grayscale inversion
Solution Approach 1:
By segmenting the voltage compensation into separate gamma voltages and compensating voltages, the patent ensures that the original gamma voltage sequence maintains its proper grayscale ordering without inversion. The compensating voltages are applied independently to adjust maximum luminance, thereby preserving display quality while achieving the desired luminance increase.
Solution Approach 2:
The patent introduces compensating voltages as an intermediary element between the gamma voltages and the final display output. These compensating voltages act as a mediator that adjusts the maximum luminance level without directly interfering with the grayscale sequence of the gamma voltages, thus preventing grayscale inversion and maintaining display quality.
3Illumination intensity
If data remapping is performed to reduce the voltage range of gamma voltages, then the maximum gamma voltage is increased, but the resolution with respect to predetermined bits is decreased
Solution Approach 1:
The patent segments the voltage control function into two independent parts: gamma voltage generation that maintains full bit-resolution without remapping, and compensating voltage generation that provides the additional voltage range needed. This segmentation eliminates the need for data remapping, thereby preventing loss of voltage resolution while still achieving increased maximum gamma voltage.
Data Source
AI summary
A gamma voltage generator includes a reference gamma selector configured to receive a first reference voltage and a second reference voltage greater than the first reference voltage, and to select top and bottom reference gamma voltages respectively corresponding to maximum and minimum gamma tab voltages that are between the first and second reference voltages, a gamma tab generator configured to select a plurality of gamma tab voltages between the maximum and minimum gamma tab voltages based on the top and bottom reference gamma voltages, a maximum gamma compensator configured to select a compensating gamma tab voltage that is greater than the maximum gamma tab voltage based on the top reference gamma voltage and a third reference voltage greater than the second reference voltage, and a gamma output configured to divide the gamma tab voltages and the compensating gamma tab voltage, and output gamma voltages corresponding to a gamma curve.