OLED Shift Register Merging for Narrow Bezel Design
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Solution Overview
Problem
Conventional organic light emitting displays have a large bezel region due to the extensive circuit area required for EM drivers, making it difficult to achieve a narrow bezel and efficient layout.
Innovation Solution
The implementation of a reduced circuit device count by using a single shift register for each subpixel EM driver, with shared light emission control signals between neighboring subpixels, allowing for a simpler circuit structure and reduced bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of EM drivers are arranged for one subpixel to control light emission duty, then the light emission control function is improved, but the circuit area increases and bezel size widens
Solution Approach 1:
The patent merges the EM driver functions for adjacent subpixels by sharing a single shift register between pairs of subpixels. Instead of dedicating separate EM drivers to each subpixel, the invention combines the light emission control functionality so that one shift register generates EM signals that are distributed to multiple subpixels, thereby reducing the total circuit area while maintaining the duty control function.
Solution Approach 2:
The shift register is designed to serve multiple functions by generating EM signals for multiple subpixels simultaneously. This multi-functional approach allows a single circuit component to perform what previously required multiple dedicated components, reducing overall circuit complexity and area occupation in the bezel region.
2Reliability
If a pair of EM drivers are arranged for one subpixel, then the light emission control function is improved, but the bezel region size increases
Solution Approach 1:
By merging the EM driver functionality across adjacent subpixels, the patent reduces the horizontal span required for EM driver circuits in the bezel region. The shared shift register approach consolidates what would otherwise be separate circuit blocks into a more compact arrangement, directly reducing bezel width.
3Reliability
If a pair of shift registers and inverters are arranged for one subpixel, then the EM driver function is improved, but the layout space is reduced
Solution Approach 1:
The patent combines the shift register and inverter circuits into a shared configuration where one shift register and its associated inverter serve multiple subpixels. This merging eliminates the need for duplicate circuits for each subpixel, significantly reducing the layout space required for EM driver functionality.
Solution Approach 2:
The EM driver circuit is designed with universal components that can serve multiple subpixels. The single shift register and inverter configuration is engineered to provide EM signals to multiple subpixels through shared signal paths, maximizing the utility of each circuit component and optimizing layout space utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes the bezel size by reducing the number of circuit devices and optimizing the layout, preventing short-circuits between data voltage and reference voltage.
Implementation Method 1
When a driving voltage is applied to the anode and the cathode of the OLED, a hole having passed through the hole transport layer (HTL) and an electron having passed through the electron transport layer (ETL) move to the emission layer (EML) to form an exciton, and consequently the emission layer (EML) emits visible light.
Data Source
AI summary
The present disclosure relates to an organic light emitting display and an apparatus for driving the same. According to the present aspects, a first light emitting transistor can be maintained to be in a turn-off state from an initial interval to a holding interval, whereby a short-circuit between data voltage and reference voltage, which occurs when the first light emitting transistor is turned on in the initial interval, can be prevented.