Reflective Pixel Electrode for High Aperture Ratio Display Module
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Solution Overview
Problem
Conventional light-field display modules have low resolution and light utilization ratio, leading to poor display effects due to the need for separate non-opening regions for pixel circuits, resulting in screen window effects and low aperture ratios.
Innovation Solution
A display module design where pixel electrodes with reflective electrodes are used to reflect light transmitted through a liquid crystal layer, eliminating the need for separate non-opening regions for pixel circuits, and incorporating a protrusion layer and planarization layers to enhance light reflection and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate non-opening regions are used for pixel circuits, then device functionality is ensured, but resolution and aperture ratio deteriorate
Solution Approach 1:
The patent merges the pixel circuit and pixel electrode regions by allowing the pixel electrode to extend over the pixel circuit area. The pixel circuit is placed in the opening region rather than requiring a separate non-opening region, thereby integrating both functional areas and improving resolution without increasing overall device complexity
Solution Approach 2:
The patent utilizes the vertical dimension by stacking components: the pixel circuit is positioned in the opening region while the pixel electrode extends vertically above it. This three-dimensional arrangement allows both the pixel circuit and pixel electrode to coexist in the same planar area, effectively resolving the contradiction between resolution and structural complexity
2Use of energy by moving object
If conventional transmissive display structure is used, then light transmission is achieved, but light utilization ratio deteriorates
Solution Approach 1:
The patent introduces a reflective electrode that inverts the light path by reflecting light back through the liquid crystal layer. Instead of light passing through once in a conventional transmissive structure, the reflected light traverses the liquid crystal layer again, effectively doubling the light utilization and reducing energy loss
Solution Approach 2:
The reflective electrode enables continuous useful action by causing light to pass through the liquid crystal layer multiple times (forward and reflected paths). This continuous interaction between light and the liquid crystal material improves the overall light utilization ratio and reduces energy waste
3Area of stationary object
If pixel electrode covers pixel circuit, then aperture ratio is improved, but electrical connection complexity increases
Solution Approach 1:
The patent applies nesting by placing the pixel circuit within the area covered by the pixel electrode. The pixel electrode is designed to extend over the pixel circuit region, creating a nested configuration where the smaller pixel circuit is contained within the larger pixel electrode area, thereby maximizing aperture ratio while managing electrical connections through vertical stacking
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
The solution achieves high resolution and improved light utilization, reducing screen window effects and increasing aperture ratios, resulting in a better display effect with higher light efficiency.
Implementation Method 1
the pixel electrode is configured to reflect light transmitted by the liquid crystal layer to the liquid crystal layer, such that the light is exited from a side, distal from the base substrate, of the liquid crystal layer
Data Source
AI summary
Provided is a display module. The display module includes: a base substrate, and a plurality of pixel circuits arranged in an array, a plurality of pixel electrodes arranged in an array, a liquid crystal layer, and a light source that are disposed on a side of the base substrate and successively arranged along a direction away from the base substrate; wherein the pixel circuit at least comprises a drive transistor, the drive transistor comprising a gate electrode, a first electrode, and a second electrode; and the pixel electrode at least comprises a reflective electrode.