OLED Display Voltage Stabilization via Feedback Control
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Solution Overview
Problem
In organic light emitting display devices, the luminance of images is affected by the voltage of the driving power, requiring the voltage to be maintained constant to display proper images.
Innovation Solution
An organic light emitting display device with a driving integrated circuit (IC) that detects the input voltage and generates an offset control signal to stabilize the voltage, and a power supply that adjusts the output voltage using a feedback circuit to maintain a constant input voltage to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving power voltage varies, then the device can operate with different power levels, but the luminance of the displayed image changes
Solution Approach 1:
The patent implements a feedback control mechanism where the driving IC detects the input voltage level and generates an offset control signal accordingly. This control signal is fed back to the power supply to adjust the output voltage, ensuring that the display panel receives a stable voltage level that maintains constant luminance regardless of input voltage variations.
Solution Approach 2:
The patent changes the offset control parameter dynamically based on the detected input voltage level. By adjusting the offset control signal in response to voltage variations, the system compensates for changes in driving power to maintain stable luminance output from the display panel.
2Illumination intensity
If a voltage detection and control system is added to maintain constant input voltage, then luminance variations are minimized, but the device complexity increases
Solution Approach 1:
The patent merges the voltage detection function and offset control signal generation into the existing driving IC. By integrating these control functions within the driving IC rather than adding separate external components, the system achieves voltage stabilization while minimizing the increase in overall device complexity.
Data Source
AI summary
An organic light emitting display device capable of maintaining a voltage of a driving power of a display panel in a substantially constant manner. The organic light emitting display device includes a display panel for receiving an image data and an input voltage to display an image; a driving IC for supplying the image data to the display panel, receiving the input voltage, and outputting an offset control signal in accordance with the received input voltage; and a power supply for controlling the input voltage in accordance with the offset control signal, and supplying the controlled input voltage to the display panel.