OLED Driving Backplane Stabilizes Brightness via Shielded Power Line
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Solution Overview
Problem
Existing OLED display panels face challenges in achieving stable brightness and reducing residual images due to the hysteresis effect in driving transistors, which affects the display's performance and efficiency.
Innovation Solution
The proposed solution involves a driving backplane with a pixel circuit that includes multiple transistors such as driving, writing, compensation, and initialization transistors, optimized in structure and arrangement to minimize light irradiation and hysteresis effects. This includes specific arrangements of the power line and data line, and the use of a storage capacitor to reduce external signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel circuit includes multiple transistors with optimized structure and arrangement, then the brightness stability is improved and residual images are reduced, but the device complexity increases
Solution Approach 1:
The pixel circuit is divided into multiple functional transistor components (driving transistor, writing transistor, compensation transistor, initialization transistor) with distinct roles. Each transistor is strategically positioned and connected to specific circuit elements to address specific functional requirements, thereby improving brightness stability while maintaining manageable complexity through functional segmentation.
Solution Approach 2:
Different regions of the pixel circuit are designed with specific transistor arrangements optimized for their local functions. The compensation transistor is positioned to specifically address hysteresis effects, while the initialization transistor handles reset functions. This localized optimization allows each part to contribute to overall brightness stability without requiring complete redesign of the entire circuit.
2Reliability
If the transistors are arranged to minimize light irradiation and hysteresis effects, then the display performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The compensation transistor is pre-configured in the circuit to counteract hysteresis effects before they significantly impact display performance. The initialization transistor is positioned to perform reset operations at appropriate timing intervals. This preliminary arrangement of functional elements allows the circuit to proactively maintain performance standards without requiring extreme manufacturing precision during assembly.
Solution Approach 2:
The compensation transistor acts as an intermediary element that mediates the hysteresis effect between the driving transistor and the light-emitting device. By introducing this intermediate component with specific connection arrangements, the circuit can tolerate broader manufacturing variations while still achieving the desired display performance, as the intermediary compensates for minor deviations.
3Reliability
If the power line includes a shielding part connected to reduce external signal interference, then the signal stability is improved, but the area of the power line increases
Solution Approach 1:
A shielding part is introduced as an intermediary element connected to the power line to block external signal interference. This shielding component acts as a protective barrier that stabilizes the power signal without requiring a complete redesign of the power distribution network, thereby achieving signal stability with minimal area increase.
Solution Approach 2:
The shielding part is strategically positioned at specific locations along the power line where external interference is most likely to affect signal stability. Rather than uniformly increasing the power line area throughout its entire length, the shielding is applied locally at critical points, optimizing the balance between signal stability and area consumption.
Data Source
AI summary
A driving backplane, a display panel and a display device are provided. The driving backplane has a pixel circuit, a data line and a power line; transistors include a driving transistor, a writing transistor, a compensation transistor and an initialization transistor; the power line includes a power line body extending along a column direction and a shielding part connected to a side of the power line body along a row direction; at least a portion of the writing transistor and the initialization transistor are located between the power line and the data line; a channel of the driving transistor overlaps with the power line; and a channel of the compensation transistor overlaps with the shielding part.