Display Device Edge Pixel Arrangement for Staircase Phenomena

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Solution Overview

Problem

Display devices experience undesirable staircase phenomena at the boundary between the display area and non-display area, with green pixels at the edge being excessively conspicuous due to luminance differences and color combinations.

Innovation Solution

A display device design featuring a round display area with a black matrix outside, where pixels are arranged in specific columns and rows with varying luminance and color filters to minimize conspicuousness, including a first pixel group partially overlapping the black matrix and a second group not overlapping it, with specific color and luminance configurations to alleviate complementary color issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If green pixels are positioned at the edge of the display region overlapping the black matrix, then the display area can be maximized, but the green pixels become excessively conspicuous due to luminance differences

Engineering Contradiction:
Improvedisplay areaVSAvoidconspicuousness of green pixels
Core Design Contradiction:
Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by assigning different color characteristics to pixels based on their position relative to the black matrix. Specifically, pixels adjacent to the black matrix boundary are configured to display colors with lower luminance (such as blue or red) rather than high luminance colors (such as green), creating a localized color adjustment zone that reduces the conspicuousness effect at the boundary region while maintaining normal pixel configuration in the interior display area.

Inventive Principle:
Principle #3Local quality

2Ease of manufacture

If pixels are arranged in a regular grid pattern, then manufacturing is simplified, but staircase phenomena occur at the boundary between display area and non-display area

Engineering Contradiction:
Improvepixel arrangementVSAvoidstaircase phenomena
Core Design Contradiction:
Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent introduces asymmetry in the pixel arrangement near the black matrix boundary. Instead of maintaining a uniform regular grid pattern throughout, the pixel layout is modified in the region adjacent to the black matrix, creating an asymmetric arrangement that compensates for the visual discontinuity caused by the boundary, thereby reducing staircase phenomena while keeping the overall manufacturing process relatively simple.

Inventive Principle:
Principle #4Asymmetry

3Illumination intensity

If high luminance pixels are placed at the boundary, then display brightness is improved, but color accuracy deteriorates due to complementary color effects

Engineering Contradiction:
Improvedisplay brightnessVSAvoidcolor accuracy
Core Design Contradiction:
Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by modifying the luminance parameter of pixels based on their position. Pixels adjacent to the black matrix are configured with lower luminance values compared to interior pixels. This parameter adjustment prevents the complementary color effect that occurs when high luminance pixels border the black matrix, thereby maintaining color accuracy while still providing adequate overall display brightness through the combined output of all pixels.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS10288926B2Display device
Publication Date: 2019.05.14 SAMSUNG DISPLAY CO LTD
  • US10288926B2 patent drawing
  • US10288926B2 patent drawing
  • US10288926B2 patent drawing

AI summary

A display device may include a black member, a first pixel and a second pixel. The black member may have a first boundary and a second boundary in a plan view of the display device. The first boundary may include a first arc and may be surrounded by the second boundary. The first pixel may include a first pixel electrode, may display a first color, may be positioned in a first pixel column of the display device, and may be intersected by the first arc in the plan view of the display device. The second pixel may include a second pixel electrode, may display a second color different from the first color, may immediately neighbor the first pixel, may be positioned in the first pixel column of the display device, and may be spaced from the first boundary in the plan view of the display device.