Segmented Organic Light Emitting Areas for Voltage Reduction
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Solution Overview
Problem
Conventional illumination apparatuses with stacked color organic layers face increased operational voltage and difficulty in adjusting individual organic light emitting devices to display desired colors, as they operate all layers simultaneously.
Innovation Solution
An illumination apparatus with a light emitting unit comprising separate scanning and data lines for individual organic light emitting areas, allowing non-simultaneous driving of red, green, and blue areas within a frame to adjust light emission based on efficiency, enabling additive mixing of colors without increasing operational voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple color organic layers are stacked in each pixel to illuminate white color, then the illumination apparatus can display multiple colors simultaneously, but the operational voltage is increased due to increased thickness of light emitting layers
Solution Approach 1:
The patent divides the light emitting unit into separate first and second light emitting areas, each containing organic light emitting devices of a single color type. This segmentation allows each area to be driven independently at lower voltages while maintaining the capability to display multiple colors through sequential activation and additive mixing, thereby resolving the contradiction between color versatility and operational voltage.
2Illumination intensity
If all organic layers are operated at the same time to realize white illumination, then the illumination apparatus can display white color, but it is difficult to adjust each organic light emitting device to display desired illumination colors
Solution Approach 1:
The patent segments the organic light emitting devices into separate first and second light emitting areas with independent control. This allows individual adjustment of each area's brightness and color characteristics through separate data signals, making it easy to tune desired illumination colors while maintaining overall white illumination capability through additive mixing.
Solution Approach 2:
The patent implements dynamic control by sequentially activating different light emitting areas during a frame period rather than operating all devices simultaneously at fixed levels. This dynamic switching enables flexible adjustment of color output by controlling the timing and intensity of each area, greatly improving ease of operation for displaying desired illumination colors.
3Ease of operation
If separate light emitting areas are used for different colors, then individual adjustment of organic light emitting devices is enabled, but the device structure becomes more complex
Solution Approach 1:
The patent merges multiple light emitting areas into a single integrated light emitting unit with a unified scanning line structure. The first and second light emitting areas share common scanning lines while having separate data lines, combining the benefits of individual adjustability with a relatively simple overall structure that avoids excessive complexity.
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
This solution allows for precise control of light emission from each organic light emitting device, reducing operational voltage and enabling the display of desired illumination colors by additively mixing red, green, and blue lights, while preventing the thickness-related voltage increase seen in conventional systems.
Implementation Method 1
a first light emitting area including at least two first organic light emitting devices emitting a first color and a second light emitting area including at least two second light emitting devices emitting a second color
Implementation Method 2
the first color light emitted from the first light emitting area and the second color light emitted from the second light emitting area may be additively mixed to emit a third color light
Data Source
AI summary
The illumination apparatus includes: a light emitting unit includes scanning lines, data lines crossing the corresponding scanning lines, and light emitting areas connected between the scanning lines and the data lines, where the light emitting areas include a first light emitting area including at least two first organic light emitting devices emitting a first color and a second light emitting area including at least two second light emitting devices emitting a second color different from the first color; and a driving unit non-simultaneously driving the first light emitting area and the second light emitting area to emit light during a frame. The method of driving the illumination apparatus includes individually emitting light from the first and second light emitting areas by respectively applying data signals to the first and second light emitting areas via the data lines connected thereto during a frame.