Display Panel Light Receiving Element for Organic EL Burning Prevention
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Solution Overview
Problem
Existing display technologies using organic EL elements face issues with 'burning' due to uneven deterioration, particularly in color displays and still images, as existing methods to prevent burning are ineffective for these scenarios.
Innovation Solution
A display panel design incorporating a light reflecting section and a light receiving element, which measures the light output level of organic EL elements by converting absorbed light into an electrical signal, allowing for accurate estimation of deterioration and correction of video signals to reduce burning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dummy pixel is provided in a region other than a display region to estimate deterioration degree, then the deterioration can be monitored, but the video signal correction is inaccurate because it does not use light emission information from the display region pixels
Solution Approach 1:
A light receiving element is introduced as an intermediary component to detect light emitted from display region pixels. This mediator enables indirect measurement of pixel deterioration by capturing optical signals from the actual display pixels, combining the advantages of both dummy pixel monitoring and accurate light emission measurement.
2Reliability
If the image is inverted at predetermined intervals to prevent burning, then monochrome display burning is reduced, but color display quality deteriorates because the inverted image is completely different from the original
Solution Approach 1:
A feedback mechanism is implemented where light receiving elements continuously monitor the light emission of display pixels, and this information is fed back to the control circuit. The control circuit adjusts drive currents in real-time to compensate for pixel deterioration, preventing burning without inverting or shifting the displayed image, thus maintaining color display quality.
3Reliability
If the image is shifted at predetermined intervals to prevent burning, then monochrome display burning is reduced, but still image display is unsuitable because the display position is shifted
Solution Approach 1:
The feedback mechanism using light receiving elements enables continuous monitoring of pixel light emission during still image display. The control circuit uses this feedback information to adjust drive currents and prevent burning, allowing still images to be displayed at fixed positions without shifting or inverting, thus maintaining still image display capability while preventing burning.
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 solution enables accurate measurement of light output and estimation of organic EL element deterioration, allowing for effective correction of video signals and reduction of burning in color and still image displays without inverting or shifting images.
Implementation Method 1
a light receiving element formed in a region facing the light shielding section, and on the pixel circuit side in relation to the light emitting element
Data Source
AI summary
A display panel includes: a plurality of pixel circuits formed in a matrix on a substrate; an insulating layer covering the plurality of pixel circuits; a plurality of light emitting elements connected to the plurality of pixel circuits, and arranged in a matrix on the insulating layer; a filtering layer including a light transmitting section at least in a part of a region facing the light emitting element and a light shielding section formed in a same plane as the light transmitting section, and formed on an opposite side from the pixel circuit in relation to the light emitting element; a light reflecting section formed in a region facing the light shielding section, and between the light emitting element and the filtering layer; and a light receiving element formed in a region facing the light shielding section, and on the pixel circuit side in relation to the light emitting element.