Luminance Compensation Device for Electroluminescence Displays
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Solution Overview
Problem
The luminance of pixels in electroluminescent displays varies due to changes in the proportion of ON pixels, causing voltage drops in the pixel driving voltage, which affects image quality and contrast ratios.
Innovation Solution
A luminance compensation device that compares the pixel driving voltage to a reference voltage, amplifies the voltage drop by a weighted value, and adjusts the gamma reference voltage to compensate for these variations, ensuring consistent luminance across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the proportion of ON pixels varies, then the current flowing through the display panel varies, but the pixel driving voltage varies causing luminance variation
Solution Approach 1:
The patent implements a feedback mechanism where the actual pixel driving voltage is continuously monitored and fed back to the gamma reference voltage generator. The gamma reference voltage is dynamically adjusted based on the measured voltage drop, creating a closed-loop system that compensates for luminance variations caused by changing ON pixel proportions.
Solution Approach 2:
The patent changes the gamma reference voltage parameter dynamically based on the actual pixel driving voltage conditions. By adjusting the gamma reference voltage in response to voltage drops caused by varying current loads, the system maintains stable luminance output despite changes in the proportion of active pixels.
2Stability of the object's composition
If the pixel driving voltage is adjusted to compensate for voltage drop, then luminance consistency is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage compensation function with the existing gamma reference voltage generator. Instead of adding a separate compensation circuit, the gamma reference voltage generator is enhanced to incorporate voltage drop detection and compensation capabilities, integrating multiple functions into a single component.
Solution Approach 2:
The gamma reference voltage generator is designed with multi-functionality, serving both as the original gamma voltage source and as the voltage compensation mechanism. This universal component handles both gamma correction and luminance stabilization, reducing the need for additional dedicated compensation hardware.
Data Source
AI summary
A luminance compensation device can include a luminance compensator configured to: receive a pixel driving voltage from a host system, the pixel driving voltage being supplied to both the luminance compensator and a display panel, receive a reference pixel driving voltage generated by a drive IC, compare the pixel driving voltage with the reference pixel driving voltage to detect a voltage drop in the pixel driving voltage, the voltage drop being a difference between the pixel driving voltage and the reference pixel driving voltage, amplify the voltage drop of the pixel driving voltage by a predetermined weighted value to generate an amplified voltage drop, and adjust a gamma reference voltage based on the amplified voltage drop to generate an adjusted gamma reference voltage.