OLED Light Emission Driver Segmentation for Voltage Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-size OLED displays experience picture quality degradation due to voltage drops across power and data signal wires, leading to luminance deterioration as a result of voltage drops affecting the current flowing through driving TFTs.
Innovation Solution
A light emission driver with multiple light emitting driving blocks, each comprising transistors and nodes that manage different power source voltages and clock signals to minimize voltage drop effects, including a system where a second node is connected to a relay signal output terminal for sequential input to the next block, and transistors that ensure uniform current flow to the OLED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If panel size is increased to achieve larger display area, then display area is improved, but voltage drop across power wiring increases causing luminance deterioration
Solution Approach 1:
The light emission driver is divided into multiple light emitting driving blocks (first, second, third blocks) that operate independently with separate clock signal input terminals. Each block processes clock signals differently (first block uses CLK1 and CLK2, second block uses CLK2 and CLK3, third block uses CLK3 and CLK4), allowing distributed control that reduces the impact of voltage drops in power wiring across large display areas.
2Manufacturing precision
If voltage drop across power wiring is reduced to maintain luminance quality, then luminance uniformity is improved, but device complexity increases due to multiple light emitting driving blocks and clock signal terminals
Solution Approach 1:
The driver is segmented into multiple independent driving blocks, each with its own clock signal input terminals. This segmentation allows each block to be controlled independently, maintaining luminance uniformity across different regions while distributing the complexity across modular units rather than requiring a completely redesigned complex system.
Solution Approach 2:
Multiple clock signal input terminals (CLK1, CLK2, CLK3, CLK4) are designed to serve multiple functions: they provide clock signals to different driving blocks, enable independent control of each block, and allow flexible configuration for different display sizes and requirements. This multi-functionality reduces the need for additional dedicated control circuits.
3Reliability
If multiple clock signal input terminals are used to control different driving blocks, then voltage drop influence is reduced, but ease of operation decreases due to increased signal management complexity
Solution Approach 1:
Each driving block has dedicated clock signal input terminals, segmenting the control interface. This allows external controllers to address and control each block independently through simple, standardized terminal connections, reducing the operational complexity despite having multiple blocks.
Solution Approach 2:
Each light emitting driving block is designed to be self-contained with its own clock signal inputs and processing capability. This self-service design allows each block to operate autonomously based on its input signals, simplifying the overall system operation as each block independently manages its own light emission control without requiring complex inter-block coordination.
Data Source
AI summary
A light emission driver for a display device is disclosed. In one aspect, the driver includes a first node to which first and second light emitting power source voltages are applied according to respective clock signals. The driver also includes a second node to which the first and third light emitting power source voltages are applied according to the respective clock signals. The driver further includes first and second transistors respectively turned on by the first and second nodes and respectively transmitting the second and first light emitting power source voltages to a light emitting signal output terminal, respectively.