Electrophoretic Light Beam Direction Control Panel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flat-panel display devices require cumbersome operations to switch between wide and narrow viewable ranges, as they need to remove and reapply optical films to adjust light distribution, leading to inefficiencies in user experience and time consumption.
Innovation Solution
A light beam direction control device with a panel comprising transparent substrates, light transmissive and absorbing regions, and electrodes, where the control circuit adjusts voltage to change the dispersion state of electrophoretic particles, allowing for quick switching between wide and narrow viewing angles by controlling the exit direction of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If optical films are used to limit the viewable range, then information leakage is prevented and viewing angle is controlled, but the device requires cumbersome removal and reapplication operations to switch between wide and narrow viewable ranges
Solution Approach 1:
The patent applies electrophoretic elements that can dynamically change the dispersion state of colored charged particles between concentrated and dispersed states through voltage control. This dynamic adjustment allows the viewing angle to be switched between narrow and wide ranges without physical film removal, resolving the contradiction between viewing angle control and operational convenience.
Solution Approach 2:
The patent changes the electrical parameter (voltage state) to control the dispersion state of electrophoretic particles. By applying direct voltage, particles concentrate to create narrow viewing angle; by applying alternating voltage, particles disperse to create wide viewing angle. This parameter-based control eliminates the need for mechanical film manipulation while maintaining viewing angle restrictions when needed.
2Adaptability or versatility
If optical films are removed and reapplied to change viewing angle, then wide and narrow viewable ranges can be achieved, but time is wasted and user convenience is reduced
Solution Approach 1:
The patent replaces the mechanical system of physically removing and reapplying optical films with an electrical system using electrophoretic elements. The colored charged particles are moved through electrical fields rather than mechanical manipulation, enabling instant switching between viewing angle states without time-consuming manual operations.
Solution Approach 2:
The electrophoretic elements provide dynamic, on-demand adjustment of viewing angle through voltage control. The system can switch between narrow and wide viewing angles instantly by changing the electrical state, eliminating the time loss associated with mechanical film manipulation while maintaining adaptability to different viewing requirements.
3Productivity
If electrophoretic elements are used to control light direction, then switching between wide and narrow viewing angles becomes rapid and efficient, but voltage control precision is required to manage luminance
Solution Approach 1:
The patent incorporates a control circuit that measures the luminance of light transmitted through the light beam direction control panel and adjusts the voltage accordingly. When luminance is lower than the target value during voltage application to change from narrow to wide viewing angle, the control circuit increases the voltage value. This feedback mechanism ensures precise voltage control to achieve the desired viewing angle transition while maintaining appropriate luminance levels.
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
Enables rapid and efficient switching between wide and narrow viewing angles without the need for physical film removal, improving user convenience and reducing operational time by controlling light transmission through voltage adjustments.
Implementation Method 1
a plurality of light absorbing regions provided between the first main face and the second main face, each of the plurality of light absorbing regions including light-absorptive electrophoretic particles having charges of a specific polarity
Data Source
AI summary
A control circuit is configured to: change a dispersion state of the electrophoretic particles by controlling voltage across the first transparent electrode and the second transparent electrode to change a range of exit direction of light transmitted through the light transmissive regions and the dispersion medium; apply direct voltage at a first voltage value across the first transparent electrode and the second transparent electrode to change the range of exit direction from a narrow range to a wide range; measure luminance of light transmitted through the light beam direction control panel during application of the voltage at the first voltage value; and increase the voltage value to be applied across the first transparent electrode and the second transparent electrode in a case where the measured luminance of the transmitted light is lower than a target value.