Anode-Connected Stacked Capacitors for Small-Pixel Display Panels
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Solution Overview
Problem
In ultra-compact display devices, the small pixel size makes it difficult to sufficiently secure the capacitance value of the capacitor element, leading to deteriorated display quality due to insufficient capacity.
Innovation Solution
A display device configuration where the capacitor element is efficiently formed by using a multilayer wiring structure with insulating and wiring layers, with electrodes connected via contact units to ensure a desired capacitance value, allowing for effective capacitance management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to achieve higher definition and ultra-compact display, then the display resolution is improved, but the capacitance value of the capacitor element becomes insufficient
Solution Approach 1:
The patent transitions from planar capacitor formation to three-dimensional stacked capacitor formation by utilizing multiple wiring layers (first wiring layer, second wiring layer, third wiring layer) stacked vertically. This dimensional change allows the capacitor to occupy vertical space rather than only horizontal space, significantly increasing capacitance within the same pixel area and solving the contradiction between small pixel size and sufficient capacitance.
2Productivity
If the capacitor element is formed in the wiring layer right above the gate electrode to utilize upper layer space, then the pixel density is improved, but the capacitor element cannot be efficiently formed due to avoidance of other gate wiring
Solution Approach 1:
The patent segments the capacitor formation into multiple independent capacitor elements (first capacitor element, second capacitor element, third capacitor element) distributed across different wiring layers. Each capacitor can be formed independently in its designated wiring layer without interfering with gate wiring in other layers, thereby maintaining high pixel density while enabling efficient capacitor formation throughout the device structure.
Data Source
AI summary
In a display device including a pixel arranged therein, the pixel including a light emitting unit in which an anode electrode is formed in the uppermost layer of a multilayer wiring structure formed by alternately stacking a plurality of insulating layers and a plurality of wiring layers, and a capacitor element electrically connected to the anode electrode of the light emitting unit, or in an electronic device including the display device, the capacitor element including a first electrode formed in a wiring layer below the anode electrode, a second electrode formed opposite to the first electrode, and attached to the anode electrode of the light emitting unit via a conductive rib, and a first insulating layer interposed between the first electrode and the second electrode.