Transparent Capacitor Array Substrate for Higher Display Aperture
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Solution Overview
Problem
Existing display panels have a low aperture ratio due to the large size of storage capacitors required for light-sensitive thin film transistors, which occupy valuable display area and reduce the panel's effectiveness.
Innovation Solution
An array substrate with a pixel circuit that includes a driving circuit and a light sensing circuit, featuring transparent electrode plates for the capacitor, allowing the light sensing circuit to operate without occupying additional display area by sharing a common voltage signal line and working alternately with the display unit within a time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the storage capacitor area is increased to match the changed amount of electricity from the light-sensitive thin film transistor, then the light sensing capability is improved, but the display area is reduced due to the opacity of the storage capacitor
Solution Approach 1:
The storage capacitor electrode plates are designed to be transparent instead of opaque, changing the optical property from opaque to transparent. This allows the capacitor to be positioned in the display area without blocking light, thus improving light sensing capability while maintaining display area and aperture ratio.
2Measurement precision
If the storage capacitor area is increased to store more electricity from the light-sensitive thin film transistor, then the light sensing sensitivity is improved, but the aperture ratio is reduced
Solution Approach 1:
The storage capacitor electrode plates are designed to be transparent instead of opaque, changing the optical property from opaque to transparent. This allows the capacitor to be positioned in the display area without blocking light, thus improving light sensing sensitivity while maintaining aperture ratio.
Solution Approach 2:
The storage capacitor is positioned in the display area rather than being separated from it, utilizing the same spatial plane. The transparent electrode plates allow the capacitor to occupy display area without reducing the effective aperture ratio, as light can pass through the capacitor structure.
3Adaptability or versatility
If the light sensing circuit is integrated into the display panel, then the functionality is improved, but the display area is occupied by the circuit components
Solution Approach 1:
The light sensing circuit and display circuit share common components including the common voltage signal line, transistor levels, and capacitor structures. This merging allows both functions to coexist in the same area without requiring separate dedicated spaces, thus improving functionality while minimizing display area occupation.
Solution Approach 2:
The common voltage signal line serves dual purposes: providing voltage for the display circuit and serving as an electrode plate for the storage capacitor in the light sensing circuit. The transistor levels and capacitor structures are shared between display and light sensing functions, allowing one structure to perform multiple functions simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves the aperture ratio and display effect by allowing a larger capacitor area without impacting the display, enhancing the light sensing capability while maintaining the display's functionality.
Implementation Method 1
the first electrode plate and the second electrode plate are both transparent electrode plates
Implementation Method 2
The light-sensitive thin film transistor generates a photocurrent after being exposed to light
Data Source
AI summary
The present application provides an array substrate and a display panel; the array substrate includes a display unit and a light sensing unit. A first electrode plate and a second electrode plate of a first capacitor of the light sensing unit are both transparent electrode plates, the first electrode plate is formed from a newly-added transparent conductive layer, the second electrode plate is served by a common electrode of the display unit, and the display unit and the light sensing unit work alternately in time-division within a time period of one frame to alleviate a problem of low aperture ratio in an existing display panel.