Display Backlight Control via Lookup Tables for Linearity
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Solution Overview
Problem
Existing display systems suffer from poor linearity between illumination and backlight control signals, resulting in inferior visual effects due to inadequate adjustment of duty cycles and illumination values.
Innovation Solution
A display system that includes a memory for storing look-up tables, a timing controller to determine target and original duty cycles based on these tables, and a backlight controller to adjust the backlight module, ensuring better linearity and visual performance by using look-up tables LUT1 and LUT2 to set target and original illumination values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional backlight control methods are used, then the system structure is simple, but the linearity between illumination and backlight control signal is poor
Solution Approach 1:
The patent pre-calculates and stores the correspondence relationships between duty cycles and illumination values in look-up tables before actual operation. The timing controller queries these pre-prepared tables to determine target and original duty cycles, eliminating the need for complex real-time calculations and improving linearity without adding operational complexity.
Solution Approach 2:
The patent introduces look-up tables as intermediary data structures that mediate between the backlight control signal and illumination output. These tables serve as a reference bridge, allowing the timing controller to accurately determine duty cycle adjustments based on target illumination values without requiring complex real-time computation algorithms.
2Manufacturing precision
If duty cycle adjustment is not optimized, then the control method is simple, but the visual effect is poor
Solution Approach 1:
The patent implements a feedback mechanism where the timing controller determines both target duty cycles (based on desired illumination) and original duty cycles (from current operation) by querying look-up tables. This feedback loop ensures accurate duty cycle adjustment to achieve target illumination values, improving visual effect through precise control rather than complex processing.
3Manufacturing precision
If look-up tables are used to determine duty cycles, then illumination linearity is improved, but memory requirements increase
Solution Approach 1:
The patent segments the illumination control into discrete duty cycle levels stored in look-up tables. Instead of continuous complex calculations, the system divides the control range into discrete steps (e.g., duty cycle percentages) with pre-calculated illumination values. This segmentation achieves good illumination linearity while keeping memory requirements manageable through discrete rather than continuous data storage.
Data Source
AI summary
A display system includes a memory, a timing controller, a backlight module, a backlight controller, and a display array. The memory is configured to store a first look-up table and a second look-up table. The timing controller is configured to determine a target illumination value according to a target duty cycle of a backlight control signal and the first look-up table, and determine an original duty cycle according to the target illumination value and the second look-up table, and output the backlight control signal according to the original duty cycle. The backlight controller is configured to control the backlight module according to the backlight control signal. The display array is configured to cooperate with the backlight module to display an image.