Signal Processing Device for Display Luminance Correction
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Solution Overview
Problem
In liquid crystal display panels, the luminance level of pixels is affected by voltage level differences between adjacent elements, leading to image quality deterioration due to electric field disturbances, especially when the distance between elements is reduced, and existing correction methods fail to properly account for asymmetric arrays and tilt angles.
Innovation Solution
A signal processing device and method that include input, luminance detection, storage, selection, differential computation, and correction voltage level calculation to adjust drive voltage signals based on specific correction factors for adjacent elements in both forward and reverse directions of the scanning line, ensuring proper luminance correction and reduced image quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between adjacent liquid crystal elements is decreased to achieve high luminance and high resolution, then display resolution is improved, but electric field disturbance occurs causing image quality deterioration
Solution Approach 1:
The patent applies preliminary anti-action by computing correction voltage levels based on voltage level differences with adjacent display elements before applying the drive voltage. The correction processing unit calculates correction factors and adjusts the voltage signal in advance to counteract the electric field disturbance that would otherwise occur between closely spaced elements, thereby maintaining image quality while achieving high resolution
Solution Approach 2:
The patent changes the voltage parameter by dynamically adjusting the drive voltage signal based on the voltage level differences between adjacent elements. The correction processing unit modifies the voltage level of the drive signal according to computed correction factors, transforming the fixed voltage approach into a variable voltage approach that compensates for electric field disturbances
2Device complexity
If correction factors are applied uniformly to all adjacent elements regardless of direction, then device complexity is reduced, but luminance correction accuracy deteriorates in asymmetric arrays
Solution Approach 1:
The patent applies asymmetry by treating adjacent display elements differently based on their directional relationship to the target element. The correction processing unit computes separate correction factors for elements in the forward direction versus the reverse direction of the scanning line, recognizing that the electric field influence differs by direction. This asymmetric correction approach accurately handles tilted scanning lines and asymmetric element arrangements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively corrects luminance levels across the display panel, reducing image quality issues caused by electric field disturbances and maintaining optimal luminance despite asymmetric arrays and tilt angles, thereby enhancing display performance.
Implementation Method 1
Each liquid crystal element changes the transmittance of light passing through the liquid crystal layer by changing the strength of the electric field between the pixel electrodes and the common electrodes in response to the voltage level of a drive voltage signal
Implementation Method 2
depending on the voltage level difference between the drive voltage signals supplied to the adjacent liquid crystal elements, the electric field disturbance occurs at the liquid crystal layer and the light transmittance is changed correspondingly
Data Source
AI summary
A signal processing device for supplying a drive voltage signal to a display panel, includes a luminance detector, a memory to store a first correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a drive voltage signal supplied to a first adjacent display element adjacent to the display element in the forward direction of the scanning line, and a second correction factor for correcting the luminance level of the pixel to be changed by a voltage level difference between a drive voltage signal supplied to the display element and a second adjacent display element adjacent to the display element in the reverse direction of the scanning line, a correction voltage level computing unit, and an adder to add the first correction voltage level and the second correction voltage level.