Light-Emitting Display With Dual Lenses for Viewing-Angle Control
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Solution Overview
Problem
Light-emitting display devices, particularly those used in vehicles, face issues with wide viewing angles that can obstruct a driver's view due to image reflection and require selective angle control for privacy and information protection, especially when used in vehicles.
Innovation Solution
A light-emitting display device with defined active areas featuring sub-pixels equipped with different lenses (half-spherical and half-cylindrical) to control viewing angles independently in private and share modes, and a gate driver integrated on the active areas to minimize bezel size and reduce signal transfer delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a light-emitting display device is designed with wide viewing angle, then image visibility is improved, but image reflection obstructs driver's view and affects safe driving
Solution Approach 1:
The display device is divided into multiple independent active areas (first active area and second active area), each capable of independently controlling viewing angles. This segmentation allows different regions to serve different functions - one for driver visibility and another for passenger entertainment, resolving the contradiction between wide viewing angle and driver safety
Solution Approach 2:
Different active areas are assigned different viewing angle characteristics. The first active area has viewing angle limited in both horizontal and vertical directions for driver safety, while the second active area has viewing angle limited only in vertical direction for passenger entertainment. This local differentiation resolves the contradiction by applying appropriate viewing angle control to each specific region
2Reliability
If viewing angle is limited for privacy protection, then information security is improved, but device functionality is restricted
Solution Approach 1:
The display device dynamically switches between private mode and share mode by controlling the operation of different active areas. In private mode, viewing angles are limited for both areas to protect information security. In share mode, the second active area allows wider viewing angle for passenger entertainment. This dynamic adaptability resolves the contradiction between information security and device functionality
Solution Approach 2:
The display device serves multiple functions through different active areas - the first active area is optimized for driver information display with restricted viewing angle for safety, while the second active area provides passenger entertainment with appropriate viewing angle control. This multi-functionality allows the device to maintain information security while providing diverse functionalities
3Ease of manufacture
If gate driver is disposed outside active areas, then manufacturing is simplified, but bezel size increases and signal transfer delay occurs
Solution Approach 1:
The gate driver is merged with and disposed within the active areas rather than outside them. This integration eliminates the need for separate bezel space for the gate driver, thereby reducing bezel size while maintaining manufacturing feasibility through the combined structure
4Ease of manufacture
If gate driver is disposed outside active areas, then manufacturing is simplified, but signal transfer delay increases
Solution Approach 1:
The gate driver is integrated within the active areas, shortening the signal transmission path from the gate driver to the sub-pixels. This reduced distance minimizes signal transfer delay while the integrated design maintains manufacturing simplicity
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 device achieves selective viewing angle control, allowing private and share modes, minimizes bezel size, and reduces signal delays, enhancing safety and privacy in vehicle applications.
Implementation Method 1
a first lens that refracts the light emitted from the first LED
Data Source
AI summary
A display device includes a display panel in which a plurality of active areas including a first active area and a second active area is defined. The device includes a plurality of sub-pixels disposed in each of the plurality of active areas, and a gate driver disposed on the plurality of active areas. Each of the plurality of sub-pixels includes a first light-emitting diode (LED) that emits light in response to a driving current and a first lens that refracts the light emitted from the first LED and a second LED that emits light in response to the driving current and a second lens that refracts the light emitted from the second LED and has a different shape from the first lens. Accordingly, the device can operate in any one of a private mode and a share mode by using the first lens and the second lens.