Organic Light Emitter With Varying Thickness Layer
Solution Overview
Problem
Existing organic light-emitting devices used in passive matrix displays and vu-meter type display devices are overly complex due to their intricate addressing mechanisms and voltage control requirements.
Innovation Solution
A simplified organic light-emitting device with a varying thickness organic layer, where the first end has a lower trigger threshold voltage than the second end, and a display device with a variable voltage supply system that can generate different voltages to selectively illuminate parts of the organic layer, eliminating the need for a control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a passive matrix display device with bar-shaped organic layers is used, then light emission can be achieved at pixel intersections, but the transmitter and addressing means become too complex for vu-meter type display devices
Solution Approach 1:
The organic layer is designed with spatially varying thickness: a first region with smaller thickness and a second region with larger thickness. This local variation in thickness creates different trigger threshold voltages in different regions, enabling the layer to function as both the light-emitting element and the voltage-controlled switch, thereby eliminating the need for separate addressing means and simplifying the transmitter structure.
2Ease of operation
If a vu-meter type display device with multiple light-emitting diodes and control circuit is used, then input signal representation is achieved, but the display device becomes complicated
Solution Approach 1:
The control circuit is extracted and removed from the display device. Instead of using a control circuit to sequentially activate diodes, the invention uses a single organic layer with varying thickness that responds directly to the applied voltage. The different thickness regions naturally provide different trigger thresholds, eliminating the need for sequential control and simplifying the device to essentially the organic layer itself with voltage supply means.
Solution Approach 2:
The organic layer serves multiple functions simultaneously: it acts as the light-emitting element, the voltage-controlled switch, and the display element itself. The varying thickness regions automatically provide the necessary trigger threshold differentiation without external control, allowing the device to display input signal levels through direct voltage application without requiring complex control circuitry.
3Adaptability or versatility
If the organic layer thickness is varied between ends, then different trigger threshold voltages are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the physical parameter of layer thickness to control electrical properties. By varying the thickness of the organic layer between its ends, the trigger threshold voltage is controlled: thinner regions have lower thresholds while thicker regions have higher thresholds. This parameter change approach provides a straightforward manufacturing method where thickness variation directly achieves the desired electrical characteristics without requiring complex multi-layer structures or precise alignment of multiple components.
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 results in a more straightforward and cost-effective display device that provides a visual representation of input signals without requiring a control circuit, making it easier to manufacture and more compact.
Implementation Method 1
an organic layer interposed between these electrodes, which is capable of emitting light
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a light transmitter (4) comprising two electrodes (19, 21) facing each other, and at least one light-emitting organic layer (20) with two ends (15, 16). The thickness of the organic layer (20) varies continuously between the two ends. The invention also relates to a display device comprising such a transmitter.