Display Unit Defect Dot Correction via Compensated Pulses
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Solution Overview
Problem
Existing organic EL display units face challenges in correcting nonluminescent spots (defect dots) without complicating the pixel circuit, as enhancing surrounding sub-pixel luminance can make defect dots more visible.
Innovation Solution
A display unit with four or more sub-pixels of different luminescent colors per pixel, where a compensated pulse is applied to adjacent sub-pixels to correct defect dots, allowing for defect dot correction without modifying the pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plural sets of pixel configuration devices including an organic EL device are provided within a single sub-pixel, then defect dot occurrence is prevented, but pixel circuit complexity increases
Solution Approach 1:
The patent uses image processing to create a corrected image that copies the visual appearance of a perfect display by compensating for defect dots in the displayed image, rather than physically replicating pixel structures. This virtual copying approach maintains simple pixel circuits while achieving defect mitigation.
Solution Approach 2:
The patent changes the luminance parameters of surrounding sub-pixels dynamically based on defect detection results. By adjusting the luminance of adjacent sub-pixels to compensate for defect dots, the system achieves defect correction without modifying the physical pixel circuit structure.
2Object-affected harmful factors
If the luminescence of sub-pixels surrounding a defect dot is enhanced, then defect visibility may be reduced, but white luminance around the defect dot is only enhanced making the defect dot highly visible
Solution Approach 1:
The patent applies different luminance compensation strategies to different color sub-pixels surrounding a defect dot. Instead of uniformly enhancing all surrounding sub-pixels, it selectively adjusts specific sub-pixels based on their color characteristics and position, achieving defect coverage while maintaining natural color balance and avoiding excessive white luminance enhancement.
Solution Approach 2:
The patent dynamically changes the luminance parameters of specific sub-pixels based on the detected defect dot characteristics. By calculating appropriate compensation values for each sub-pixel's luminance parameter, the system reduces defect visibility while preventing excessive overall luminance enhancement that would make the defect more apparent.
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
This approach effectively reduces the visibility of defect dots by ensuring the total luminance of adjacent sub-pixels matches the intended luminescence, preventing the defect dot from being highly visible.
Implementation Method 1
a display unit using a current drive type optical device the luminescence of which varies depending on a value of a flowing current, such as an organic EL device as a pixel light-emitting device
Data Source
AI summary
A display unit includes: a display panel including, for each pixel, four or more types of sub-pixels that are different from one another in luminescent colors; and a driving circuit applying a pulse based on an image signal to each of the sub-pixels, and applying, when the sub-pixels include a sub-pixel of a defect dot, a compensated pulse configured to correct the defect dot to the sub-pixels that are adjacent or close to the sub-pixel of the defect dot.