Transparent Organic Patterns with Microcapsules for Reflective Display Brightness
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Solution Overview
Problem
Reflective liquid crystal displays have low display brightness due to low reflectivity, which is limited by the transmittance of the color film and the luminous efficacy of liquid crystals, and improving reflectivity through reducing pigment thickness is restricted by production processes.
Innovation Solution
A substrate with transparent organic patterns and microcapsules containing light-absorbing and light-reflecting particles is used, where the particles move oppositely under an electric field, improving reflectivity by reflecting external light without passing through the liquid crystal layer, and reducing reflectivity in dark states by absorbing light, thus enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pigment thickness in the color film is reduced to improve reflectivity, then the display brightness is improved, but the production process becomes more difficult to control and manufacturing precision deteriorates
Solution Approach 1:
The invention divides the color film structure into separate components: color sub-pixel regions with pigments and brightening sub-pixel regions without pigments. This segmentation allows the brightening regions to have high reflectivity without requiring precise control of pigment thickness, as they lack pigments entirely. The color information is provided by the adjacent color sub-pixel regions, eliminating the need to balance pigment thickness for both color accuracy and reflectivity.
Solution Approach 2:
The invention applies different local qualities to different regions of the display: color sub-pixel regions contain pigments for color generation, while brightening sub-pixel regions are pigment-free for high reflectivity. This local differentiation allows each region to optimize its function without compromising the other, solving the contradiction between color fidelity and reflectivity.
2Illumination intensity
If the color film transmittance is increased to improve reflectivity, then the display brightness is improved, but the contrast ratio deteriorates due to reduced light absorption in dark states
Solution Approach 1:
The invention segments the pixel structure into color sub-pixel regions and brightening sub-pixel regions. The brightening regions provide high reflectivity for brightness without needing to absorb light in dark states, while the color sub-pixel regions with pigments maintain contrast by absorbing light when needed. This segmentation allows simultaneous optimization of brightness and contrast ratio.
Solution Approach 2:
Different local qualities are assigned: brightening regions have high reflectivity and low absorption for brightness enhancement, while color regions have variable absorption properties for contrast control. This local quality differentiation resolves the contradiction between brightness and contrast ratio.
3Illumination intensity
If microcapsules with light-absorbing and light-reflecting particles are introduced to improve reflectivity, then the display brightness is improved, but the device complexity increases
Solution Approach 1:
The invention uses particles with different optical properties (light-absorbing and light-reflecting particles) within microcapsules to dynamically change the optical characteristics of the brightening regions. Under electric field control, these particles rearrange to provide either high reflectivity or high absorption, enabling dynamic contrast control without complex mechanical structures.
Solution Approach 2:
The invention changes the optical parameters of the brightening regions by controlling particle arrangement in microcapsules. By applying electric fields, the optical properties (reflectivity vs. absorption) are dynamically adjusted, providing a simple electro-optic mechanism to control display brightness and contrast without mechanical 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
The solution significantly improves display brightness and contrast ratio by increasing reflectivity in bright states and reducing it in dark states, overcoming the limitations of existing technologies.
Implementation Method 1
light-absorbing particles and light-reflecting particles which are moveable in the capsule shell, and moving directions of the light-absorbing particles are substantially opposite to moving directions of the light-reflecting particles under an action of an electric field
Data Source
AI summary
A substrate includes a base, a first electrode provided on the base, and a plurality of transparent organic patterns provided on the first electrode. Part or whole of each of a plurality of color sub-pixel regions of the substrate does not overlap with a region where each of the plurality of the transparent organic patterns is located. Microcapsules are scattered in each of the plurality of transparent organic patterns, and each of the microcapsules includes a capsule shell and light-absorbing particles and light-reflecting particles which are moveable in the capsule shell. Moving directions of the light-absorbing particles are substantially opposite to moving directions of the light-reflecting particles under an action of an electric field having an electric field direction perpendicular to the base, and the first electrode is included in electrodes forming the electric field.