Storage Capacitor Micro-Reflection Structures for LCD Brightness
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Solution Overview
Problem
Half transflective mode LCD devices face challenges in achieving sufficient brightness, especially indoors, due to limited reflectivity of the existing light reflective structures, which affects image clarity and visibility.
Innovation Solution
The implementation of micro-reflection structures on the surface of a storage capacitor, with a high reflectivity second electrode positioned over a first electrode featuring holes, increasing the surface area for light reflection without adding extra manufacturing steps, thereby enhancing reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light reflective structure is used in half transflective mode LCD devices, then the device can provide both transmissive and transflective functionality, but the reflectivity is insufficient leading to poor image clarity and brightness especially indoors
Solution Approach 1:
The patent introduces a micro-lens array structure that transforms the flat reflective surface into a three-dimensional microlens structure. These microlenses protrude from the reflective layer toward the liquid crystal layer, creating a dimensional change that focuses and redirects light more effectively. This dimensional transformation enables the reflective structure to capture and redirect more light beams back through the liquid crystal layer, thereby improving both brightness and image clarity without compromising the half transflective functionality.
Solution Approach 2:
The patent employs spherical or curved microlens structures on the reflective layer instead of a flat surface. These curved microlens elements focus incident light more efficiently and redirect it back through the liquid crystal layer with greater intensity. The spherical geometry of the microlenses optimizes light reflection and focusing, enhancing the overall reflectivity and brightness of the display while maintaining clear image quality.
2Illumination intensity
If the reflectivity of the storage capacitor is increased to improve brightness, then image clarity improves, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The patent combines the light reflective function with the storage capacitor structure by forming microlenses directly on the storage capacitor electrode. This merging of functions allows the storage capacitor to serve dual purposes: maintaining electrical charge and enhancing light reflection. By integrating the reflective microlens structure into the existing capacitor architecture rather than adding a separate reflective component, the patent improves brightness while minimizing increases in device complexity and manufacturing steps.
Solution Approach 2:
The storage capacitor structure is designed to perform multiple functions simultaneously: electrical charge storage and light reflection enhancement. The microlens structure formed on the capacitor electrode transforms it into a multi-functional element that contributes to both the electrical operation of the pixel and the optical performance of the display. This multi-functionality reduces the need for additional dedicated reflective components, thereby controlling device complexity.
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 approach significantly increases the reflectivity of the storage capacitor, improving the brightness and clarity of images in LCD devices by utilizing the existing manufacturing processes without additional complexity.
Implementation Method 1
The transflective electrode region 1312 is made from a metal material having high reflectivity, such as aluminum... When the external light beams LI strikes the transflective electrode region 1312 after passing through the upper base plate 14, the light beams L1 reflect back to the upper base plate 14 so as to illuminate the crystal display panel
Data Source
AI summary
A pixel element includes a transistor, a pixel electrode and a storage capacitor. The transistor is a switch device of the pixel element. A data signal is applied to the pixel electrode by switching the transistor. The storage capacitor includes the first electrode and the second electrode. Several holes are formed on a surface of the first electrode. Therefore, layers disposed over the first electrode duplicate the shape of the holes, so that the layers have rough surfaces, for increasing the reflectivity.