Display Panel Capacitive Electrode Layer Orthographic Projection

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Solution Overview

Problem

Large-size and high-resolution display screens have a low display aperture ratio due to the opaque common electrode used in their storage capacitors, which affects their performance.

Innovation Solution

A display panel design that includes a capacitive electrode layer with capacitor units arranged in the same layer as the driving circuit, where the orthographic projection of these units on the pixel electrode layer is within the trunk electrodes, increasing the display aperture ratio by reducing the border of the screen and improving display performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an opaque common electrode is used in the storage capacitor, then the storage capacitor can be formed, but the display aperture ratio is reduced

Engineering Contradiction:

Improvestorage capacitor formationVSAvoiddisplay aperture ratio

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent extracts the common electrode from the pixel structure and relocates it to form the capacitive electrode layer in the driving circuit layer. This separation allows the common electrode to be positioned in the non-display area, removing its obscuring effect from the display region while preserving its capacitive function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent transitions the common electrode from a two-dimensional planar structure within the pixel to a three-dimensional configuration where it extends into the driving circuit layer. This dimensional change allows the electrode to maintain its capacitive function while being positioned outside the display aperture area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If the capacitive electrode layer is integrated with the driving circuit layer, then the manufacturing process is simplified, but layer alignment precision must be maintained

Engineering Contradiction:

Improvemanufacturing process integrationVSAvoidlayer alignment precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent merges the capacitive electrode layer with the driving circuit layer into a single integrated structure. This combination reduces the total number of fabrication steps and aligns the capacitor formation process with the existing driving circuit manufacturing flow, thereby simplifying the overall manufacturing process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent incorporates the capacitive electrode formation into the early stages of the driving circuit layer fabrication process. By preparing the capacitive electrode structure beforehand during the driving circuit manufacturing sequence, subsequent alignment operations can leverage the already-established reference structures, improving positioning accuracy.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11294248B2Display panel and display device

Publication Date: 2022.04.05 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A display panel and a display device are provided. The display panel includes a capacitive electrode layer and pixel electrode layer which form a storage capacitor. An orthographic projection of first capacitor units of the capacitive electrode layer on the pixel electrode layer is located within a first trunk electrode or/and a second trunk electrode. Due to the orthographic projection of the capacitive electrode layer on the pixel electrode layer is located within a trunk electrode, a display aperture ratio is increased.