OLED Display Light Detection Layer for Brightness Crosstalk Control
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Solution Overview
Problem
OLED display panels face issues with uneven brightness due to aging, necessitating real-time luminous intensity detection for internal or external compensation to ensure uniform image brightness.
Innovation Solution
Incorporation of a light detection layer with photoelectric detectors and quarter-wave plates to accurately measure luminous intensity by eliminating crosstalk from reflected light and ambient interference, using polarizers and quarter-wave plates to manage light polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light detection layer is added to detect luminous intensity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The light detection layer is integrated within the display panel structure by positioning photoelectric detectors between the light-emitting devices and the transparent cover plate, nesting the detection function within the existing display architecture rather than adding a separate external system
Solution Approach 2:
A light pass hole is introduced as an intermediary structure in the common electrode layer to allow light from the light-emitting devices to reach the photoelectric detectors while maintaining the overall structural integrity of the display panel
2Measurement precision
If photoelectric detectors are positioned close to light-emitting devices for accurate detection, then measurement precision is improved, but crosstalk from reflected light increases
Solution Approach 1:
The patent utilizes the reflected light that would normally cause crosstalk by introducing a light pass hole, allowing this reflected light to be directed through the hole to the photoelectric detector, converting the harmful reflected light into a useful detection signal while maintaining detection precision
Solution Approach 2:
The common electrode layer is designed with different local properties: it maintains its normal reflective function in most areas while introducing a light pass hole at specific locations to allow reflected light to reach the photoelectric detectors, creating localized optical functionality
3Object-affected harmful factors
If common electrode layer is made opaque to block ambient light, then ambient light interference is reduced, but light transmittance for detection decreases
Solution Approach 1:
The common electrode layer is designed with different local optical properties: it remains opaque in most areas to block ambient light interference while incorporating a light pass hole at specific locations to allow detection light to pass through to the photoelectric detectors
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
Enables precise luminous intensity detection, allowing for effective brightness compensation and improved display uniformity by reducing crosstalk and ambient light interference.
Implementation Method 1
The photoelectric conversion layer is configured to convert absorbed light into electricity
Implementation Method 2
a polarizer and a first quarter-wave plate that are sequentially stacked between the display substrate and the transparent cover plate
Data Source
AI summary
A display panel includes a display substrate. The display substrate includes: a base substrate; a display structure layer including a plurality of pixel circuits and a plurality of light-emitting devices on the base substrate; and a light detection layer located at a non-light exit side of the light-emitting devices. A pixel circuit in the plurality of pixel circuits is electrically connected to a respective light-emitting device to drive the light-emitting device to emit light. The light detection layer is configured to detect a luminous intensity of at least one light-emitting device. The display substrate further includes: a transparent cover plate at a light exit side of the light-emitting devices; and a polarizer and a first quarter-wave plate between the display substrate and the transparent cover plate. The polarizer is closer to the display substrate than the first quarter-wave plate.