Non-rectangular Display Panel Edge Brightness Control

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Solution Overview

Problem

Non-rectangular display panels face issues with inconsistent light transmission at their edges due to overlapping sub-pixels, leading to color shifts and reduced display quality.

Innovation Solution

A display panel design with a non-rectangular display region and a peripheral region, featuring pixel units and a shielding layer where the transmittance of peripheral sub-pixels is adjusted to be less than inner sub-pixels, using different structures for peripheral and inner pixel units to reduce brightness and improve display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If sub-pixels in peripheral pixels are driven with the same grey level as inner sub-pixels, then the manufacturing and control process is simplified, but the brightness and color consistency deteriorates due to inconsistent light transmitting areas at non-rectangular edges

Engineering Contradiction:
Improvecontrol process simplicityVSAvoidbrightness consistency
Core Design Contradiction:
Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies local quality by differentiating the structure of peripheral pixel units from inner pixel units. Specifically, peripheral pixel units are designed with different sub-pixel arrangements, sizes, or transmittance characteristics to compensate for the reduced light transmitting area at non-rectangular edges. This allows each region to have optimized properties: inner pixels maintain standard structure while peripheral pixels are locally adapted to achieve uniform brightness across the display region.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent employs parameter changes by adjusting key parameters of peripheral pixel units, such as sub-pixel area, transmittance, or aperture ratio, to compensate for edge effects. By modifying these parameters differently for peripheral versus inner pixels, the system achieves consistent brightness output despite the non-rectangular geometry, resolving the contradiction between simplified control and brightness precision.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If the display region is designed with a non-rectangular shape, then the design flexibility and adaptability are improved, but the display quality deteriorates due to color shifts and brightness inconsistency at the edges

Engineering Contradiction:
Improvedesign flexibilityVSAvoiddisplay quality
Core Design Contradiction:
Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent resolves this contradiction by implementing local quality differentiation between peripheral and inner pixel units. The peripheral pixel units are specifically designed with adjusted structures (such as modified sub-pixel configurations or different transmittance properties) to compensate for the geometric distortions inherent in non-rectangular shapes. This allows the display to maintain high quality across the entire display region while preserving the desired non-rectangular form factor.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent applies asymmetry by creating intentional structural differences between peripheral and inner pixel units. Rather than using a uniform pixel structure throughout, the system employs asymmetric designs where peripheral pixels have tailored characteristics that account for their position at the non-rectangular boundaries. This asymmetric approach enables the display to achieve visual consistency despite the asymmetric non-rectangular geometry.

Inventive Principle:
Principle #4Asymmetry

3Device complexity

If peripheral pixel units have the same structure as inner pixel units, then the device complexity is reduced, but the light transmitting area inconsistency causes color shifts and reduces display quality

Engineering Contradiction:
Improvepixel structure uniformityVSAvoidcolor consistency
Core Design Contradiction:
Device complexityVSManufacturing precision

Solution Approach 1:

The patent resolves this contradiction by applying local quality principles, where peripheral pixel units are designed with different structural characteristics compared to inner pixel units. These local structural modifications (such as adjusted sub-pixel dimensions, different arrangements, or varied transmittance properties) are specifically targeted at peripheral regions to compensate for reduced light transmitting area, thereby maintaining color consistency without requiring complex global restructuring of the entire pixel array.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS11112641B2Display panel
Publication Date: 2021.09.07 HANNSTAR DISPLAY CORP
  • US11112641B2 patent drawing
  • US11112641B2 patent drawing
  • US11112641B2 patent drawing

AI summary

The present invention provides a display panel having a display region and a peripheral region, and the display panel includes a plurality of pixel units including at least one inner pixel unit and at least one first peripheral pixel unit, and a shielding layer. A shape of the display region is non-rectangular. The inner pixel unit is disposed in the display region and includes at least one inner sub-pixel unit. The first peripheral pixel unit is disposed in both the display region and the peripheral region and includes at least one first peripheral sub-pixel unit. At least a part of the shielding layer is disposed in the peripheral region, and the at least a part partially overlaps the first peripheral pixel unit. A structure of the first peripheral pixel unit is different from a structure of the inner pixel unit.