Liquid Crystal Display Panel Light Utilization via Reflective Black Matrices
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Solution Overview
Problem
Traditional liquid crystal display panels experience significant light loss due to the absorption of non-red, non-green, and non-blue light components by color filters, leading to low brightness and increased costs when trying to improve backlight module efficiency.
Innovation Solution
The implementation of optical filter layers on the lower glass substrate, matching the colors of the corresponding color-resist elements, and the use of reflection layers on black matrices to redirect non-transmitted light back to the backlight source, enhancing light utilization and reducing absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to select specific wavelengths, then the desired color transmission is achieved, but most light of other colors is absorbed causing significant light loss
Solution Approach 1:
The patent converts the harmful absorption of non-matching wavelengths by color filters into a beneficial reflection mechanism. By placing reflective layers behind the color filter array, light wavelengths that would otherwise be absorbed are reflected back through the color filters, giving them multiple chances to pass through and contribute to the final image, thus converting energy loss into useful light transmission.
Solution Approach 2:
The patent introduces reflective layers as intermediary elements between the light source and the color filter array. These reflective layers act as mediators that redirect non-absorbed light back through the system, enabling multiple utilization of the same light photons and improving overall light efficiency without requiring additional light sources.
2Illumination intensity
If more LEDs or superior color filter materials are used to improve backlight brightness, then the brightness increases, but the cost of the backlight module increases
Solution Approach 1:
The patent changes the optical parameters of the system by introducing reflective layers with specific reflectivity characteristics. This parameter modification allows the existing color filter array and LED configuration to achieve higher effective brightness without requiring additional LEDs or expensive superior materials, thereby improving brightness while controlling manufacturing costs.
3Loss of energy
If optical filter layers are added to improve light utilization, then light utilization ratio improves, but the device complexity increases
Solution Approach 1:
The patent merges the optical filtering function with the existing color filter array structure. By integrating reflective layers behind the existing color filters rather than adding separate optical filter layers, the design achieves improved light utilization while minimizing structural complexity. The reflective layers are combined with the existing color filter substrate, creating a unified structure that performs multiple functions.
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 improves the light utilization ratio and brightness of the liquid crystal display device while simplifying the manufacturing process and reducing production costs by ensuring only desired colors transmit through the optical filter layers and unwanted colors are reflected back for reuse.
Implementation Method 1
each optical filter layer having a color the same as a corresponding color-resist element... only light of a color the same as that of the corresponding color-resist element can transmit through the optical filter layer, while light of other colors is reflected
Implementation Method 2
use of reflection layers on black matrices to redirect non-transmitted light back to the backlight source
Data Source
AI summary
The liquid crystal display panel comprises an upper glass substrate and a lower glass substrate, wherein the upper glass substrate comprises a plurality of color-resist units, each of which comprises a red color-resist element, a green color-resist element, and a blue color-resist element that are spaced from one another, and a plurality of black matrixes each being arranged between two adjacent color-resist elements; and wherein the lower glass substrate comprises a plurality of optical filter layers arranged on an outside surface thereof, said optical filter layers corresponding to red color-resist elements, green color-resist elements, and blue color-resist elements respectively, and each optical filter layer having a color the same as a corresponding color-resist element. The structure of the liquid crystal display panel according to the present disclosure is simple. The light utilization ratio of the backlight source can be effectively improved, and thus the brightness of the liquid crystal display panel can be improved.