Display Backlight Inclined Light Units for Dark Corners
Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from vignetting, where the corner areas of the screen are not adequately illuminated due to the light emitting angle of LED light sources, resulting in dark corners that affect viewing and processing of content.
Innovation Solution
The light emitting units on the light bar are inclined with respect to the back plate, with a preset angle between 60 degrees to 90 degrees, allowing light to be shifted towards the corners of the display panel, thereby avoiding dark corners and improving the display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED light sources are positioned on a straight circuit board to form a light bar, then the light bar can be easily manufactured and fixed to the back plate, but the light emitted cannot reach the corners of the display panel due to the light emitting angle, resulting in vignetting
Solution Approach 1:
The light bar is changed from a straight linear arrangement to an arc-shaped arrangement, adding curvature as a new dimensional characteristic. This arc shape allows light from LEDs positioned at the ends of the arc to be directed toward the corners of the display panel, solving the vignetting problem while maintaining ease of manufacture through a simple geometric modification
Solution Approach 2:
The geometric parameter of the light bar is changed from a straight line to an arc with a specific radius of curvature. This parameter change alters the light emission trajectory, enabling light to reach the corners of the display panel while maintaining the same LED components and manufacturing process
2Illumination intensity
If the light emitting units are inclined with respect to the back plate at a preset angle, then light can be shifted to the corners of the display panel to eliminate dark corners, but the structural complexity of the light bar increases
Solution Approach 1:
The inclination angle of the light emitting units is optimized to a preset angle between 60-90 degrees relative to the back plate. This specific parameter range achieves effective corner illumination while minimizing structural complexity, as the inclination can be achieved through simple mounting adjustments rather than complex mechanical structures
Solution Approach 2:
The light bar is configured in an arc shape, which naturally provides the angular variation needed to direct light toward corners. This geometric dimensionality change eliminates the need for individually inclined LEDs, reducing structural complexity while maintaining effective corner illumination
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 solution effectively eliminates dark corners, enhancing the display and observation experience by ensuring that light reaches the corners of the LCD screen, thus improving the overall display quality.
Implementation Method 1
a backlight module including a light source used for emitting light to the display panel
Data Source
AI summary
A display device is provided. The display device includes a display panel, a frame including a back plate therein, a backlight module including a light source used for emitting light to the display panel. The light source includes a light bar with a plurality of light emitting units. The light bar is fixed on the back plate, the light emitting units on the light bar are inclined with respect to the back plate, so that portions of light emitted by the light emitting units near two ends of the back plate on the light bar are shifted to corners of the display panel.