Dynamic Light Emitter Control for Stretchable Display Brightness
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Solution Overview
Problem
Stretchable display devices experience a decline in image quality when stretched, as the number of light emitting units in the ON mode changes, leading to a noticeable difference in the stretched image.
Innovation Solution
The electronic device includes a substrate and multiple electronic units, where the number of light emitting units in the ON mode is adjusted based on the device's state, ensuring that the image quality remains consistent before and after stretching. This is achieved by controlling the number of light emitting units per unit area, maintaining a ratio within specific limits (1.5×PPA_1≥PPA_2≥0.5×PPA_1) to minimize the difference in image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting units in ON mode is increased to maintain image quality after stretching, then the brightness per unit area is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of the number of light emitting units in ON mode based on the stretching state. The controller dynamically changes which light emitting units are activated - in the first state, a first number of units are ON, and in the second state, a second number of units are ON, where the second number is greater than the first number. This dynamic adaptation allows the display to maintain image quality across different stretching states without requiring all units to operate at maximum capacity simultaneously.
Solution Approach 2:
The patent changes the operational parameters of the light emitting units based on stretching state. Specifically, it adjusts the number of active light emitting units (from first number to second number, where second > first) and controls the brightness per unit area to maintain the relationship 1.5×PPA_1≥PPA2≥0.5×PPA1. This parameter adjustment allows the system to compensate for the area increase during stretching while avoiding the need for a uniformly complex high-density configuration in all states.
2Reliability
If the number of light emitting units per unit area is maintained after stretching, then the image quality is preserved, but the total energy consumption increases
Solution Approach 1:
The system dynamically adjusts the operational state of light emitting units based on the stretching condition. In the first state, only a first number of units are in ON mode, while in the second state, a second number (greater than the first) are in ON mode. This dynamic approach ensures image quality consistency by adapting to the changed geometry, while avoiding continuous high-energy consumption that would result from maintaining maximum brightness in all units at all times.
Solution Approach 2:
The patent implements parameter changes in the operational state of light emitting units. It controls the number of units in ON mode to change from the first number to the second number, and simultaneously controls the brightness per unit area (PPA) to maintain the relationship 1.5×PPA1≥PPA2≥0.5×PPA1. This coordinated parameter adjustment preserves image quality while managing energy consumption by not requiring all units to operate at full brightness simultaneously.
3Illumination intensity
If more light emitting units are activated in the second state, then the brightness per unit area is maintained, but the manufacturing complexity increases
Solution Approach 1:
The patent employs dynamic control of light emitting unit activation based on stretching state rather than requiring a static high-density configuration. The controller activates a first number of units in the first state and a second number (greater than the first) of units in the second state. This dynamic approach achieves the required brightness per unit area (maintaining 1.5×PPA1≥PPA2≥0.5×PPA1) without requiring the manufacture of a uniformly high-density array that would be needed if all units had to operate at maximum capacity in all states.
Data Source
AI summary
An electronic device able to be operated with a first state and a second state includes a substrate and electronic units. In a top view, the substrate has a first area in the first state and a second area in the second state, and the second area is greater than the first area. The electronic units are overlapped with the substrate. The number of the electronic units being in a mode of ON in the second state is greater than that in the first state. The electronic device has a PPA_1 that is defined as a number of the electronic units being in the mode of ON per unit area of the substrate in the first state, and a PPA_2 that is defined as a number of the electronic units being in the mode of ON per unit area of the substrate in the second state, and 1.5×PPA_1≥PPA_2≥0.5×PPA_1.