Electronic Ink Shutter for OLED Brightness and Black Visibility
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Solution Overview
Problem
Conventional organic light-emitting display devices face a reduction in brightness due to the use of polarization plates, which block both reflected ambient light and emitted light, leading to increased power consumption and reduced competitiveness.
Innovation Solution
An organic light-emitting display device incorporating an electronic ink layer with charged particles that move to cover or uncover pixels based on the device's power state, functioning similarly to a shutter to maintain black visibility without obstructing light emission when powered on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarization plate is used to block reflected ambient light, then black visibility is improved, but brightness is reduced and power consumption increases
Solution Approach 1:
The patent uses an electronic ink layer with movable charged particles that can dynamically change position based on power state. When powered off, particles move to cover the display for black visibility; when powered on, particles move away to allow brightness. This dynamic behavior resolves the contradiction by making the light-blocking property conditional rather than static.
Solution Approach 2:
The patent changes the optical parameter of the display surface by moving charged ink particles between two states: covering the pixels (black visibility) and uncovering the pixels (brightness). This parameter change allows the display to switch between blocking and transmitting light, resolving the contradiction between black visibility and brightness.
2Object-affected harmful factors
If a polarization plate is used to provide black visibility, then black visibility is improved, but power consumption increases
Solution Approach 1:
The electronic ink layer provides dynamic control where charged particles automatically move to provide black visibility only when needed (powered off state). When powered on, particles move away, eliminating the need for continuous power consumption. This dynamic approach reduces energy use compared to a static polarization plate that continuously blocks light.
Solution Approach 2:
The charged ink particles respond automatically to the power state of the display without requiring additional power consumption for control. The particles self-organize to provide black visibility when powered off and self-disperse when powered on, making the system energy-efficient and eliminating the need for active control mechanisms.
3Object-affected harmful factors
If charged ink particles are used to cover pixels when off, then black visibility is improved, but device complexity increases
Solution Approach 1:
The patent extracts the light-blocking function from a traditional polarization plate and implements it using charged ink particles in an electronic ink layer. This extraction allows the display to achieve black visibility without the need for a continuous polarization plate, reducing the complexity of the overall optical structure while maintaining the desired function.
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 electronic ink layer effectively provides black visibility when the device is off and maintains brightness when on, with improved optical characteristics compared to traditional polarization plates, reducing brightness loss and power consumption.
Implementation Method 1
the electronic ink layer may include a main electrode to apply an electrical force to the charged ink particles, and the charged ink particles may gather around the main electrode by applying a voltage to the main electrode while the display unit is turned on
Implementation Method 2
The electronic ink layer may include a main electrode and an auxiliary electrode to apply an electrical force to the charged ink particles in different directions, the charged ink particles may gather around the main electrode when a voltage is applied to the main electrode when the display unit is turned on, and the charged ink particles may gather around the auxiliary electrode when a momentary voltage is applied to the auxiliary electrode when the display unit is turned off
Data Source
AI summary
An organic light-emitting display device is disclosed. In one embodiment, the device includes a display unit having a plurality of pixels and an electronic ink layer for changing a distribution of charged ink particles and selectively substantially covering the pixels on the display unit. The device provides black visibility while it is powered off using an electronic ink layer operating in the same manner as a shutter so that a reduction of brightness while forming an image may be inhibited.