Display Panel Driver Lookup Table Segmentation for Luminance Precision
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Solution Overview
Problem
Conventional display panel drivers increase power consumption and chip size by storing a large number of data signal values in lookup tables regardless of maximum input luminance and grayscale, leading to recognizable errors in luminance and color coordinates, especially at low luminance or grayscale levels.
Innovation Solution
A display panel driver that uses lookup tables with varying numbers of data signal values based on maximum input luminance, dividing them into groups such as first, second, and third luminance groups, and generating compensation tables by linear interpolation when necessary, to reduce errors and optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data signal values stored in the lookup table is increased to reduce luminance and color coordinate errors, then display quality is improved, but chip area and power consumption increase
Solution Approach 1:
The patent divides the lookup table into multiple groups based on maximum input luminance levels. Each group contains data signal values optimized for specific luminance ranges, allowing the system to select appropriate groups based on current display conditions. This segmentation enables reduced total storage while maintaining precision where needed.
Solution Approach 2:
The patent applies different data signal value densities to different luminance ranges. Low luminance ranges (where users are most sensitive to errors) receive higher precision with more data points, while high luminance ranges use fewer points. This local optimization maintains display quality where critical while reducing overall storage requirements.
2Measurement precision
If the number of data signal values stored in the lookup table is increased to reduce luminance and color coordinate errors, then display quality is improved, but power consumption increases
Solution Approach 1:
The lookup table is segmented into luminance-based groups that are selectively activated. The driving controller selects which group to use based on the current maximum input luminance, enabling the system to maintain high color coordinate precision when needed while consuming less power when operating in ranges that require fewer data points.
Solution Approach 2:
The system dynamically changes operational parameters by selecting different lookup table groups based on maximum input luminance. This parameter change allows the system to optimize between precision and power consumption depending on the display conditions, using higher precision modes only when necessary.
3Area of stationary object
If a fixed number of data signal values is stored in the lookup table regardless of maximum input luminance, then chip area and power consumption are reduced, but luminance and color coordinate errors become noticeable at low luminance or grayscale levels
Solution Approach 1:
The patent segments the lookup table into multiple groups with different data signal value counts, each optimized for specific maximum input luminance ranges. This allows the system to use smaller tables for high luminance applications while having access to larger, more precise tables when operating at low luminance levels where precision is critical.
Solution Approach 2:
The system dynamically selects which lookup table group to use based on the maximum input luminance parameter. This dynamic adaptation allows the system to optimize between storage efficiency and precision in real-time, switching between different data signal value densities depending on operational conditions rather than using a fixed configuration.
Data Source
AI summary
A display panel driver includes: a driving controller receiving input image data and converting the input image data into a data signal and a data driver converting the data signal into a data voltage. The driving controller includes a plurality of lookup tables storing data signal values corresponding to grayscale values of the input image data based on an input maximum luminance, and a total number of the data signal values stored in a first lookup table corresponding to a first input maximum luminance is different from a total number of the data signal values stored in a second lookup table corresponding to a second input maximum luminance.