OLED Display Compensation Line for Voltage Fluctuation
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Solution Overview
Problem
The change in voltage value of the initial power reference voltage in OLED display devices leads to fluctuations in brightness and chroma of the display screen, resulting in reduced yield and display quality.
Innovation Solution
The display device incorporates a compensation line connected to the first signal transmission line, which transmits an anode reset voltage that changes synchronously with the initial power reference voltage, thereby stabilizing the voltage difference between the anode and cathode of each light-emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the initial power reference voltage ELVSS is transmitted through the signal transmission line, then the anode reset voltage can be output, but transmission loss causes voltage value changes leading to brightness and chroma fluctuations
Solution Approach 1:
The patent introduces a feedback mechanism by adding a compensation line that transmits a compensated anode reset voltage. This compensation voltage is generated based on the actual voltage at the detection point, creating a closed-loop system that automatically corrects for transmission losses and maintains consistent display performance across different panel positions.
Solution Approach 2:
The compensation line acts as an intermediary element between the signal transmission line and the light-emitting devices. It introduces a compensating voltage signal that mediates the effect of transmission loss, thereby maintaining the intended voltage relationship without requiring changes to the original signal transmission path.
2Productivity
If transmission loss is present in the signal transmission line, then voltage value changes occur, but this causes brightness and chroma changes reducing product yield
Solution Approach 1:
The detection point monitors the actual voltage in the signal transmission line and feeds this information back through the compensation line, enabling real-time compensation for transmission losses and maintaining voltage stability across all light-emitting devices.
Solution Approach 2:
The patent changes the voltage parameter by introducing a compensated anode reset voltage that adjusts its value based on the detected voltage drop. This dynamic parameter adjustment compensates for transmission losses and maintains consistent display characteristics.
3Manufacturing precision
If a compensation line is added to transmit compensated anode reset voltage, then voltage stability improves, but device complexity increases
Solution Approach 1:
The patent segments the voltage compensation function into a separate compensation line distinct from the signal transmission line. This segmentation allows the compensation mechanism to operate independently while maintaining a clear functional separation between signal transmission and voltage stabilization.
Solution Approach 2:
The compensation line serves as an intermediary structure that adds minimal complexity while achieving the desired voltage stability. It connects to existing components (detection point, light-emitting devices) without requiring complete system redesign.
Data Source
AI summary
Provided is a display device (100). The display device (100) includes a display panel (10), a driving chip (20), a first signal transmission line (12), and a compensation line (14). In a display stage, a first terminal (a) of the driving chip (20) outputs an initial power reference voltage (ELVSS) and transmits it to a cathode (B) of a light-emitting device (D) through the first signal transmission line (12), a second terminal (b) outputs an initial anode reset voltage (V0) to an anode (A) of the light-emitting device (D), and the compensation line (14) transmits an anode reset voltage (VI) that changes synchronously with the initial power reference voltage (ELVSS) to any position of the first signal transmission line (12).