PDLC Display Brightness Correction Circuit
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Solution Overview
Problem
Polymer dispersed liquid crystal (PDLC) display devices using the field sequential drive method suffer from display unevenness and coloring due to decreasing light intensity from the edge closer to the light source, affecting the brightness and color accuracy of adjacent images.
Innovation Solution
A display system that includes a correction coefficient generating circuit to adjust image data based on brightness, generating first and second correction coefficients to uniformly illuminate the display panel, thereby correcting brightness gradients and color discrepancies between adjacent images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PDLC display device uses the field sequential drive method, then the display device can realize lighting and shading of a glass window and achieve a wide viewing angle without polarization plates, but display unevenness and coloring occur due to decreasing light intensity from the edge closer to the light source
Solution Approach 1:
The patent applies local quality by dividing the display area into multiple regions (first display area closer to light source, second display area farther from light source) and applying different correction coefficients to each region. The correction coefficient generation circuit generates region-specific correction coefficients based on the expected light intensity distribution, thereby compensating for the inherent non-uniformity in PDLC display devices while maintaining the lighting and shading functionality.
2Use of energy by moving object
If light intensity decreases from the edge closer to the light source, then the lighting function is achieved, but brightness and color accuracy of adjacent images are affected
Solution Approach 1:
The patent implements preliminary action by pre-calculating and applying correction coefficients to the image data before display. The correction coefficient generation circuit determines the appropriate correction coefficients based on the light intensity distribution characteristics of the PDLC display device, and these coefficients are applied to adjacent images in advance to prevent brightness and color inaccuracies before they manifest in the final display.
3Manufacturing precision
If correction coefficients are generated based on brightness to uniformly illuminate the display panel, then display unevenness is suppressed, but additional circuit complexity is introduced
Solution Approach 1:
The patent introduces an intermediary element - the correction coefficient generation circuit - that mediates between the light source and the display panel. This intermediary circuit processes the image data by generating and applying correction coefficients that compensate for light intensity variations, thereby achieving uniform display without requiring physical modifications to the PDLC structure or complex optical systems.
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 system effectively suppresses display unevenness and coloring, ensuring consistent brightness and accurate color representation across the display panel by uniformly distributing light intensity, enhancing the overall image quality.
Implementation Method 1
a polymer dispersed liquid crystal (PDLC system) type display device has attracted attention. The PDLC is in an opaque white state when no voltage is applied, for example, and becomes transparent when a voltage is applied.
Data Source
AI summary
A display system includes a lighting device, a correction coefficient generating circuit receiving a plurality of image data including first image data and second image data, generating a first correction coefficient based on a brightness of the first image data and generating a second correction coefficient based on a brightness of the second image data, and the first image data corresponding to a first image and a second image data corresponding to a second image adjacent to the first image and located on the opposite side of the lighting device, a multiplication circuit generating first corrected image data using the first image data and the first correction coefficient, and generating second corrected image data using the second image data and the second correction coefficient, and a display drive control unit transmitting the first and the second corrected image data to the display panel.