OLED Display Panel Color Consistency Inspection
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels experience significant color differences when viewed from various angles, leading to reduced display quality and user inconvenience.
Innovation Solution
A method involving the use of a chromaticity diagram to measure and compare color coordinates at different viewing angles, with adjustments to the thickness of organic layers to minimize color differences, specifically by setting a reference area and determining if target polar coordinates fall within this area, allowing for adjustments in the thickness of layers such as red, green, and blue organic light emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel uses standard OLED structure with organic light emitting layers, then the device achieves low power consumption and high luminance, but significant color differences occur when viewed from different angles
Solution Approach 1:
The patent adjusts the thickness parameters of organic light emitting layers (red, green, and blue layers) to optimize color consistency across different viewing angles. By changing the thickness parameter of each layer, the emission characteristics are tuned to minimize color shift when viewed from angles other than perpendicular to the display surface.
Solution Approach 2:
The patent employs a composite structure of multiple organic light emitting layers with different materials (red, green, and blue emitting materials) stacked together. This composite approach allows each layer to contribute to the overall color output, and by adjusting their relative thicknesses, the color consistency across viewing angles is improved while maintaining high luminance.
2Manufacturing precision
If the thickness of organic layers is adjusted to minimize color differences, then color consistency across viewing angles is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent establishes specific thickness ranges for each organic light emitting layer (red, green, and blue layers) to achieve optimal color consistency. By defining these parameter ranges, the manufacturing process gains clear guidance for controlling layer thickness, reducing the complexity of achieving precise color matching across different viewing angles.
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 method effectively reduces or minimizes color differences across viewing angles, enhancing the display quality of OLED panels by ensuring consistent color representation.
Implementation Method 1
a red organic light emitting layer, a green organic light emitting layer, and a blue organic light emitting layer
Data Source
AI summary
A method of inspecting a display panel, which is capable of substantially minimizing a color difference of a display panel according to a viewing angle, includes: setting a reference area having a center point on a chromaticity diagram; emitting a white light on the display panel; measuring first color coordinates of a target point of the display panel at a first viewing angle; measuring second color coordinates of the target point at a second viewing angle; calculating a difference value between the first color coordinates and the second color coordinates; converting the difference value into target polar coordinates with the center point as an origin; and determining whether the target polar coordinates are within the reference area.