Light-Emitting Display Panel with Stacked Capacitor and Dual Gate TFT

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Solution Overview

Problem

The increase in size of transistors and capacitors in light emitting display panels reduces the aperture ratio due to the use of opaque conductors, obstructing light emission.

Innovation Solution

Implementing a dual gate structure for the driving transistor and using a storage capacitor with at least three electrodes, each in separate layers, to reduce the size of the conductors while maintaining performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the size of the conductor constituting the transistor and capacitor is increased to solve degraded light emitting elements and increase charging efficiency, then the performance of the light emitting element and capacitor is improved, but the aperture ratio is reduced

Engineering Contradiction:
Improvelight emitting element performanceVSAvoidaperture ratio
Core Design Contradiction:
ReliabilityVSArea of stationary object

Solution Approach 1:

The patent applies dimensionality change by transitioning from a planar conductor layout to a three-dimensional stacked structure. Multiple conductors are arranged in different layers (first conductor layer, second conductor layer, third conductor layer) vertically stacked above each other. This vertical stacking enables the conductors to occupy different spatial dimensions, thereby increasing the effective conductor area for improved performance while maintaining a compact footprint that preserves the aperture ratio.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements nesting by placing conductors within conductors or stacking them in nested layers. The first, second, and third conductors are positioned in overlapping horizontal projections, creating a nested configuration where conductors are embedded within the vertical space occupied by others. This nested arrangement maximizes the use of available space, allowing multiple conductors to coexist in a compact area without significantly increasing the overall footprint.

Inventive Principle:
Principle #7Nested doll (Nesting)

2Productivity

If the size of the conductor constituting the transistor and capacitor is increased to increase charging efficiency of the capacitor, then the capacitor charging efficiency is improved, but the size of the opening through which light is emitted is reduced

Engineering Contradiction:
Improvecapacitor charging efficiencyVSAvoidopening size
Core Design Contradiction:
ProductivityVSArea of stationary object

Solution Approach 1:

The patent applies dimensionality change by arranging capacitor conductors in multiple vertical layers rather than expanding them horizontally. The first, second, and third conductors are stacked vertically with their horizontal projections overlapping or partially overlapping. This vertical stacking increases the effective capacitor area for improved charging efficiency while maintaining a compact horizontal footprint that preserves the opening size for light emission.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent merges the functions of multiple conductors by arranging them in overlapping configurations. The first, second, and third conductors are positioned such that their horizontal projections overlap, allowing them to share the same horizontal space. This merging approach enables the capacitor to achieve higher charging efficiency through increased conductor area without proportionally increasing the overall device area, thus preserving the opening size.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentUS12581995B2Light emitting display panel
Publication Date: 2026.03.17 LG DISPLAY CO LTD
  • US12581995B2 patent drawing
  • US12581995B2 patent drawing
  • US12581995B2 patent drawing

AI summary

A light emitting display panel includes a driving transistor, and a storage capacitor including at least three electrodes to reduce a size of the driving transistor or the storage capacitor. The light emitting display panel comprises a light emitting element, the driving transistor connected to the light emitting element, and the storage capacitor connected to a gate and a first electrode of the driving transistor. The driving transistor includes a light shielding electrode used as the gate of the driving transistor, a buffer covering the light shielding electrode, an active portion provided on an upper surface of the buffer, forming the first electrode, a second electrode and a semiconductor portion of the driving transistor, a gate insulating layer covering the active portion, and a gate electrode provided on an upper surface of the gate insulating layer and connected to the light shielding electrode.