Electroluminescent Display Gamma Offset Extrapolation
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Solution Overview
Problem
The challenge in electroluminescent display devices is the difficulty in implementing accurate brightness for low gray values due to limited sensitivity of detection devices, leading to color distortion and degraded image quality.
Innovation Solution
A method and device that determine gamma offsets through a multi-time programmable operation for various gray values, generating low gray voltages using a slope factor based on base and reference gamma offsets, and extrapolating or interpolating voltages to reduce color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MTP operation is performed with limited sensitivity detection, then manufacturing process can be completed, but color distortion of low gray values occurs
Solution Approach 1:
The patent segments the gray value range into multiple groups (first group with higher gray values detectable by the detecting device, and second group with lower gray values that are difficult to detect). Different gamma offset determination methods are applied to each group: MTP operation for the first group and calculation based on slope factor for the second group. This segmentation allows the system to leverage the detecting device's sensitivity where available while using mathematical extrapolation for the difficult-to-detect range.
Solution Approach 2:
The patent performs preliminary MTP operations to determine gamma offsets for reference gray values in the first group before calculating the gamma offsets for low gray values in the second group. The slope factor is calculated based on the previously determined gamma offsets, and this preliminary data is then used to extrapolate the difficult-to-measure low gray value parameters, reducing the need for direct detection in the problematic range.
2Device complexity
If detecting device sensitivity is limited, then device complexity is reduced, but measurement precision of low gray values deteriorates
Solution Approach 1:
The patent introduces a slope factor as an intermediary element that bridges the gap between measurable and unmeasurable gray values. The slope factor, calculated from gamma offsets of reference gray values that are detectable, serves as a mediator to extrapolate the gamma offsets for low gray values that are difficult to detect directly. This intermediary approach allows accurate determination of low gray value parameters without requiring enhanced detection device sensitivity.
3Ease of operation
If gamma offsets are determined only for reference gray values, then MTP operation is simplified, but low gray voltages cannot be accurately generated
Solution Approach 1:
The patent changes the parameter determination approach from direct measurement to calculation-based derivation. Instead of relying solely on direct MTP operation for all gray values, the system calculates gamma offsets for low gray values by changing the method from empirical measurement to mathematical computation using the slope factor. This parameter change enables accurate low gray voltage generation while maintaining MTP operation simplicity for the reference gray values.
Data Source
AI summary
A first gamma offset corresponding to a first gamma reference voltage is determined by performing a multi-time programmable (“MTP”) operation with respect to a first reference gray value, a second gamma offset corresponding to a second gamma reference voltage is determined by performing the MTP operation with respect to a second reference gray value greater than the first reference gray value, a base gamma offset is determined by performing the MTP operation with respect to a base reference gray value smaller than the first reference gray value. and low gray voltages corresponding to low gray values smaller than the first reference gray value are generated based on the base gamma offset, the first gamma offset and the second gamma offset.