Direct-Type Backlight LCD Layout for Blue-Light Edge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing direct-type backlight liquid crystal display devices suffer from uneven light emission and low color purity due to the deflection of blue light at the edges, leading to a blue phenomenon and reduced display effectiveness.
Innovation Solution
The device incorporates a design where blue sub-pixels are partially blocked by a black matrix at the edges, with narrowed effective display areas, and employs a reflective structure to redirect blue light, along with a frame sealant to minimize light loss, enhancing light efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If blue sub-pixels are arranged at the outermost edge of the color film substrate, then the display coverage is maximized, but blue light deflection occurs at the edges causing color purity degradation and a blue phenomenon
Solution Approach 1:
The patent converts the harmful blue light deflection at the edges into a beneficial effect by intentionally positioning blue sub-pixels at the outermost edge. The black matrix strategically blocks excessive blue light while allowing sufficient blue light to pass through, transforming the potential color purity problem into a design feature that maximizes display coverage without significant color degradation
Solution Approach 2:
The patent applies different treatment to different regions of the display. The black matrix is positioned to selectively block blue light at the edge regions where blue sub-pixels are located, while leaving the central regions unaffected. This local quality approach ensures that blue light management is optimized specifically at the edges without compromising the overall display performance
2Object-generated harmful factors
If the effective display area of blue sub-pixels at the edge is reduced by black matrix blocking, then color purity is improved, but light utilization efficiency decreases
Solution Approach 1:
The patent applies partial blocking of blue light using the black matrix at the edges rather than complete blocking. This partial action approach maintains sufficient blue light transmission to preserve color purity while avoiding excessive light loss. The black matrix blocks only the excessive blue light that causes color degradation, leaving the necessary blue light for normal display function
Solution Approach 2:
The patent optimizes the parameters of the black matrix including its width, position, and optical properties to achieve the right balance between color purity and light utilization. By carefully adjusting these parameters, the black matrix blocks sufficient blue light to prevent color degradation while maintaining adequate light transmission for display effectiveness
3Illumination intensity
If multiple lamp tubes are used in direct-type backlight to increase light source intensity, then brightness is improved, but light distribution uniformity deteriorates
Solution Approach 1:
The patent introduces a reflective plate as an intermediary component between the multiple lamp tubes and the liquid crystal display panel. This reflective plate redirects and redistributes the light from multiple lamp tubes, ensuring that light from different sources is evenly distributed across the display area, thus maintaining uniformity while benefiting from the increased brightness of multiple lamp tubes
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 improves light utilization and color saturation by reducing the effective display area of blue sub-pixels at the edges, ensuring uniform light emission and enhanced display quality.
Implementation Method 1
a light homogenizing element, the light emitting element is disposed on the bottom plate, light emitted by the light emitting element is projected at a light incident side of the liquid crystal display panel after being adjusted by the light homogenizing element
Implementation Method 2
the set of sub pixels which are located on a main surface of the color film substrate at one edge along the first direction are partially covered by a black matrix
Implementation Method 3
a liquid crystal layer sandwiched between the array substrate and the color film substrate
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
At least one embodiment of the disclosure provides a direct-type backlight liquid crystal display device, and the direct-type backlight liquid crystal display device includes a frame (101), including a main frame (101a)and a bottom plate (101b); a liquid crystal display panel (102), arranged on a top surface of the main frame (101a) and parallel to the bottom plate (101b), in which the liquid crystal display panel (102) includes an array substrate (1021), a color film substrate (1022), a liquid crystal layer and a frame sealant (1024), a pixel unit (1025) on the color film substrate (1022) includes a sub pixel (1025a), and the sub pixel (1025a) located on a side of the color film substrate (1022) along a first direction parallel to the color film substrate (1022) is partially blocked and covered by a black matrix, a backlight unit (103), including a light emitting element (103a) and a light homogenizing element (103b); and a display control unit (104), disposed at a lateral end surface of the liquid crystal display panel (102) and electrically connected with the liquid crystal display panel (102) at the lateral end surface of the liquid crystal display panel (102), the blue sub pixels (1025b) provided by the embodiments of the present disclosure are arranged at the outermost edge of the pixel region, so that the unmixed blue light directly passes through the blue sub pixels (1025b) to improve light efficiency and color saturation, thereby improving the utilization rate of white light emitted by a light emitting diode and improving the uniformity of light emission.