Display Panel Stray Light Partition for Luminance Correction
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Solution Overview
Problem
Display devices with organic electroluminescence suffer from luminance unevenness due to variations in light emitting unit characteristics, wire resistance, and transistor characteristics, which existing compensation methods inadequately address.
Innovation Solution
A display panel with a two-dimensional matrix of light emitting units and drive circuits, featuring partitions that guide stray light to optical sensors for detection, allowing for luminance correction by adjusting video signal gradation values based on detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing compensation methods are used to address variation in transistor characteristics, then some degree of luminance correction is achieved, but the luminance unevenness cannot be sufficiently improved because compensation is only for variation in a specific element
Solution Approach 1:
The patent replaces electrical compensation methods with optical detection. Optical sensors detect stray light from each light emitting unit, and this optical information is used to determine correction values for luminance unevenness, substituting purely electrical compensation approaches with an optical-mechanical detection system.
Solution Approach 2:
The patent implements a feedback mechanism where optical sensors continuously detect the actual light output of each light emitting unit, and this detection information feeds back to adjust the drive signals. The correction values are determined based on detected stray light amounts and used to compensate for luminance variations in real-time operation.
2Measurement precision
If partitions are provided between adjacent light emitting units to guide stray light to optical sensors, then detection accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent introduces partitions as intermediary structures between light emitting units and optical sensors. These partitions guide and direct stray light from each light emitting unit toward its corresponding optical sensor, acting as a mediator that improves detection accuracy by controlling light paths without requiring direct line-of-sight positioning.
Solution Approach 2:
The patent applies local quality by providing partitions specifically at locations where stray light guidance is needed, rather than uniformly across the entire display panel. Each partition is localized between adjacent light emitting units and their corresponding optical sensors, providing targeted light management where required.
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 unevenness across the display by accurately detecting light emitting amounts and adjusting video signal gradation values, improving overall image quality.
Implementation Method 1
a partition for guiding stray light from a light emitting unit to an optical sensor provided on the display panel
Data Source
AI summary
A display device includes: a display panel including display elements each including a light emitting unit and a drive circuit for driving the light emitting unit, the display elements being arranged in a two-dimensional matrix on a substrate; and a luminance correction unit for correcting luminances of the display elements in display of an image by the display panel by correcting a gradation value of a video signal, in which a partition (60) for guiding stray light from a light emitting unit to an optical sensor (4) provided on the display panel is provided between adjacent light emitting units of the display panel, and the luminance correction unit corrects a gradation value of a video signal associated with each of the display elements on the basis of a gradation value of an uncorrected video signal and a detection result from the optical sensor.