Anti-Reflective Layer Integration in OLED Panels
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Solution Overview
Problem
Conventional organic electroluminescent display panels face challenges in achieving high contrast ratios due to high reflectivity, which is not efficiently reduced by existing black matrix structures, and the addition of external anti-reflective films increases panel thickness and reduces brightness.
Innovation Solution
An anti-reflective layer is formed between the substrate and the organic light emitting diode, with a light-shielding layer having an opening to expose the anti-reflective layer, allowing for the integration of a thin film transistor and organic light emitting diode, eliminating the need for external anti-reflective films and reducing panel thickness while enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an external anti-reflective film is adhered to the outside of the light-emitting surface, then the reflectivity is reduced, but the thickness of the display panel is increased and the light transmission is reduced
Solution Approach 1:
The anti-reflective function is moved from the external surface (2D plane) to the internal structure (3D integration), specifically by forming the anti-reflective layer between the substrate and the organic light emitting diode, and integrating it with the black matrix region structure
Solution Approach 2:
The anti-reflective layer is integrated with the black matrix region structure, combining the anti-reflective function with the existing structural element, thereby eliminating the need for separate external anti-reflective films
2Object-affected harmful factors
If an external anti-reflective film is adhered to the outside of the light-emitting surface, then the reflectivity is reduced, but the light transmission of the opening region is reduced
Solution Approach 1:
The anti-reflective function is relocated from the external light-emitting surface to the internal structure between the substrate and the organic light emitting diode, allowing light to pass through the opening region without being blocked by an external film
Solution Approach 2:
The anti-reflective layer serves as an intermediary structure integrated within the display panel, positioned between the substrate and the organic light emitting diode, mediating the reduction of reflectivity without interfering with the light emission path
3Object-affected harmful factors
If the black matrix region area is increased to reduce reflectivity, then the reflectivity decreases, but the area available for other components is reduced
Solution Approach 1:
The anti-reflective property is applied locally to specific regions (black matrix regions and regions beneath the organic light emitting diode) rather than requiring a uniform increase in black matrix area across the entire display panel
Solution Approach 2:
The anti-reflective structure is segmented into different regions: black matrix regions with anti-reflective layer and opening regions with anti-reflective layer, allowing independent optimization of each region's function
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 increases the contrast ratio of the organic electroluminescent display panel without compromising brightness, by reducing reflectivity and maintaining a thinner panel structure.
Implementation Method 1
an anti-reflective layer 28 is formed between the substrate 26 and the organic light emitting diode 24
Data Source
AI summary
An organic electroluminescent display panel comprises a substrate, an anti-reflective layer, a light-shielding layer, a transistor and an organic light emitting diode. A method for fabricating said organic electroluminescent display panel comprises forming the anti-reflective layer on the substrate; forming the light-shielding layer with a first region and a second region on the anti-reflective layer; and then, removing at least part of the light-shielding layer to expose at least part of anti-reflective layer in the first region. After that, the transistor is formed above the light-shielding layer in the second region, and the organic light emitting diode is formed above the anti-reflective layer in the first region.