Bendable Reflective Layers for True Black Display in LCD Backlight Modules
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Solution Overview
Problem
Conventional LCDs face difficulties in achieving true black display due to the challenge of maintaining exactly perpendicular polarization directions between upper and lower polarizing films, leading to incomplete light blocking.
Innovation Solution
A backlight module with bendable reflective layers and complementary shading areas on substrates, where the reflective layers reflect light back when not bent, ensuring no light passes through when no voltage is applied, allowing for all-black display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LCD uses perpendicular polarizing films to block light, then black display is achieved, but true black cannot be displayed due to manufacturing precision limitations
Solution Approach 1:
Instead of trying to achieve perfect perpendicular alignment between polarizing films (conventional approach), the patent inverts the approach by using bendable reflective layers that actively redirect light paths. When these layers bend toward each other, they create an optical path that prevents light from reaching the polarizing films, achieving black display through geometric optimization rather than relying on precise polarization alignment.
Solution Approach 2:
The patent changes the physical state and geometric parameters of the reflective layers by making them bendable. The bending degree, curvature radius, and distance between reflective layers are adjusted to optimize light blocking performance. This dynamic parameter adjustment allows the system to achieve true black display without requiring high manufacturing precision for polarizing film alignment.
2Illumination intensity
If bendable reflective layers are added to block light, then true black display is achieved, but device complexity increases
Solution Approach 1:
The bendable reflective layers serve multiple functions: they act as both the reflective surface for light redirection and the active element for black display control. By integrating these functions into a single component, the patent avoids adding separate complex mechanisms, thereby limiting the increase in device complexity while achieving true black display.
Solution Approach 2:
The patent uses flexible thin film structures for the reflective layers, which can be bent and positioned precisely. This flexible film approach is simpler than rigid mechanical structures and allows for easier integration into the existing backlight module, minimizing the increase in 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
The solution enables true black display and improved contrast by ensuring light is completely blocked when no voltage is applied, addressing the limitations of existing technologies.
Implementation Method 1
The first reflective layers, in a bent state, reflect light reaching the first reflective layers after passing through the photic areas of the second substrate to the second reflective layers, and the second reflective layers reflect the light reflected thereto to the photic areas of the first substrate
Implementation Method 2
each of the bendable reflective sheets may comprise a light-reflecting film and an electro-bend film attached thereto
Data Source
AI summary
The present invention provides backlight module and manufacturing method thereof, display device comprising backlight module and driving method for driving the display device. The backlight module comprises first substrate and second substrate opposite to each other. Each of the first and second substrates comprises multiple photic areas and shading areas arranged at intervals thereon, and projections of the shading areas of the first substrate on the second substrate completely cover the photic areas of the second substrate. On side of the first substrate opposite to the second substrate, first reflective layers which are bendable are formed on the shading areas thereof, and on side of the second substrate opposite to the first substrate, second reflective layers are formed on the shading areas thereof. The first reflective layers, in a bent state, reflect light to the second reflective layers which then reflect light to the photic areas of the first substrate.