Backlight Module Dynamic Privacy Mode via Light Guide Switching
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Solution Overview
Problem
Current display devices with privacy-protection films face a trade-off between privacy protection and display brightness, as the films reduce light transmittance and require increased power consumption to maintain brightness, making dynamic privacy protection challenging.
Innovation Solution
A backlight module with a first light-emitting component using a regular light guide plate and a second light-emitting component using a collimated light guide plate, which switches between modes to adjust view angles, allowing for dynamic privacy protection without reducing display brightness by turning off the first light source and turning on the second light source in privacy-protection mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a privacy-protection film is added to the display device, then the view angle is reduced to achieve privacy protection, but the light transmittance decreases which reduces display brightness
Solution Approach 1:
The backlight module is segmented into multiple independent light-emitting components (first light-emitting component with regular light guide plate, second light-emitting component with collimated light guide plate), each capable of independent operation. This allows selective activation to achieve different view angles without using privacy-protection films that reduce light transmittance.
Solution Approach 2:
The system dynamically switches between different light-emitting components based on operational mode. In normal display mode, the first light source is activated for wide view angle; in privacy-protection mode, the second light source with collimated light guide plate is activated to narrow the view angle. This dynamic switching enables adaptive privacy protection without compromising brightness.
2Illumination intensity
If the display brightness is maintained after adding privacy-protection film, then the light transmittance loss is compensated, but the power consumption increases
Solution Approach 1:
The system dynamically activates only the necessary light-emitting component based on the operational mode. In privacy-protection mode, only the second light source is activated rather than both sources simultaneously, reducing power consumption compared to maintaining brightness with a privacy film while compensating for light loss.
Solution Approach 2:
The system changes the optical parameters by switching between different light guide plates (regular vs. collimated), which alters the light emission characteristics (view angle) without requiring increased power input to maintain brightness, thus avoiding the power consumption penalty of privacy films.
3Object-affected harmful factors
If a privacy-protection film is used to reduce view angle, then privacy protection is achieved, but the dynamic privacy-protection effect cannot be achieved due to increased power consumption
Solution Approach 1:
The system implements dynamic privacy protection by allowing real-time switching between different light-emitting components based on user needs. The control circuit enables transition between normal display mode (first light source) and privacy-protection mode (second light source), providing adaptability without the fixed nature of privacy films.
Solution Approach 2:
By segmenting the backlight module into independently controllable light-emitting components, the system enables dynamic selection of privacy protection levels. Users can switch between wide view angle and narrow view angle modes as needed, achieving dynamic adaptability that static privacy films cannot provide.
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 effectively achieves dynamic privacy protection by reducing view angles without compromising display brightness, eliminating the need for privacy-protection films and their associated power consumption and light transmittance issues.
Implementation Method 1
a first light-emitting component including a regular light guide plate disposed on a side of the display panel and at least one first light source disposed on a peripheral side of the regular light guide plate
Implementation Method 2
a second light-emitting component including a collimated light guide plate disposed on a side of the regular light guide plate and at least one second light source disposed on a peripheral side of the collimated light guide plate
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a first light-emitting component and a second light-emitting component. The first light-emitting component includes a regular light guide plate, and an angle between a light emitted by the first light-emitting component and a first direction is less than or equal to a first preset angle, and the first direction is perpendicular to the first direction. The second light-emitting component includes a collimated light guide plate, an angle between a light emitted by the second light-emitting component and the first direction is less than or equal to a second preset angle, and the second preset angle is less than the first preset angle.