In-Cell Touch Liquid Crystal Display with Reflective Electrode
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Solution Overview
Problem
Current liquid crystal display devices that can perform display in a reflection mode suitable for outdoor use do not have an in-cell touch panel capability, which is desirable for thickness and weight reduction as well as increased light transmittance.
Innovation Solution
A liquid crystal display device structure is developed, featuring a first substrate with a thin film transistor, pixel electrode, and reflective layer, along with a second substrate and a liquid crystal layer. The device includes a retardation layer and polarizer on the viewer side, with a plurality of pixels arranged in a matrix, each containing a reflective region for reflection mode display and a transmissive region. The reflective layer is formed of a conductive material and is connected to the common electrode, with a layered structure including a metal layer and a transparent conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external touch panel is attached to a liquid crystal display device, then touch sensor function is achieved, but thickness and weight increase and light transmittance decreases
Solution Approach 1:
The patent combines the touch sensor function with the liquid crystal display panel by integrating the touch sensor electrode layer into the display panel structure itself. The touch sensor electrode is formed on the same substrate as the liquid crystal display, merging two separate functions (display and touch sensing) into a single integrated component, thereby eliminating the need for an external touch panel attachment.
2Reliability
If an external touch panel is attached to a liquid crystal display device, then touch sensor function is achieved, but weight increases
Solution Approach 1:
The patent combines the touch sensor function with the liquid crystal display panel by integrating the touch sensor electrode layer into the display panel structure itself. The touch sensor electrode is formed on the same substrate as the liquid crystal display, merging two separate functions (display and touch sensing) into a single integrated component, thereby eliminating the need for an external touch panel attachment.
3Reliability
If an external touch panel is attached to a liquid crystal display device, then touch sensor function is achieved, but light transmittance decreases
Solution Approach 1:
The patent combines the touch sensor function with the liquid crystal display panel by integrating the touch sensor electrode layer into the display panel structure itself. The touch sensor electrode is formed on the same substrate as the liquid crystal display, merging two separate functions (display and touch sensing) into a single integrated component, thereby eliminating the need for an external touch panel attachment.
4Illumination intensity
If a reflective layer is added for reflection mode display, then outdoor display capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the reflective layer with the touch sensor electrode layer into a single integrated layer structure. The reflective layer serves dual purposes: providing reflection mode display capability for outdoor visibility and serving as the touch sensor electrode for detecting touch input. This merging eliminates the need for separate touch sensor and reflective layer components.
Solution Approach 2:
The reflective layer is designed to perform multiple functions simultaneously: it provides reflection mode display capability for outdoor visibility, serves as the touch sensor electrode for detecting touch input, and maintains electrical connectivity with the common electrode. This multi-functionality reduces the overall device complexity by eliminating separate components.
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 configuration enables the realization of a pixel structure suitable for a liquid crystal display device that can perform display in a reflection mode and function as an in-cell touch panel, offering improved display quality, reduced thickness, and increased light transmittance.
Implementation Method 1
a liquid crystal layer provided between the first substrate and the second substrate
Implementation Method 2
a reflective layer located at least in the reflective region
Implementation Method 3
a polarizer disposed more to the viewer side than the liquid crystal layer
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate disposed more to a viewer side than the first substrate, and a liquid crystal layer provided between the first substrate and the second substrate, with a plurality of pixels being arrayed in a matrix shape. Each pixel includes a reflective region for display in a reflection mode. The first substrate includes a thin film transistor provided corresponding to each pixel, a pixel electrode electrically connected to the thin film transistor, and a reflective layer located at least in the reflective region. The first substrate further includes a common electrode adjacent to the pixel electrode with a dielectric layer interposed between the pixel electrode and the common electrode. At least one from among the pixel electrode and the common electrode includes at least one slit.