Light Emitting Driver Using Homogeneous Transistors
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Solution Overview
Problem
Conventional organic electroluminescent displays require separate processing steps and additional components due to the use of both p-type and n-type transistors in their light emitting control drivers, leading to increased size, weight, and manufacturing complexity.
Innovation Solution
Implementing a light emitting control driver with only p-type or n-type transistors, matching the transistor type of the pixel circuit, to simplify the manufacturing process and reduce costs, and using switching elements to prevent simultaneous application of power voltages, thereby reducing power loss and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both p-type and n-type transistors are used in the light emitting control driver, then the driving function is achieved, but the device size increases and manufacturing complexity increases
Solution Approach 1:
The patent applies homogeneity by using only n-type transistors for both the pixel circuit and the light emitting control driver, eliminating the need for p-type transistors. This uniform transistor type throughout the display device simplifies the manufacturing process, reduces device complexity, and eliminates the need for separate processing steps for different transistor types while maintaining full driving functionality.
2Adaptability or versatility
If both p-type and n-type transistors are used in the light emitting control driver, then the driving function is achieved, but the processing time increases
Solution Approach 1:
By using only n-type transistors uniformly across the pixel circuit and light emitting control driver, the patent eliminates the need for separate processing steps required for p-type and n-type transistor fabrication. This homogeneous approach reduces processing time by allowing single-step transistor formation processes and eliminating the need for different doping and annealing sequences.
3Device complexity
If switching elements are not used to control power voltage application, then the circuit is simpler, but power loss increases and heat generation occurs
Solution Approach 1:
The patent introduces switching elements as intermediary components that control the application of power voltages to the hold node. These switching elements act as mediators between the power supply and the pixel circuit, enabling precise control of when power voltages are applied. This prevents simultaneous application of first and second power voltages, thereby reducing power loss and heat generation while maintaining circuit functionality.
Data Source
AI summary
A driver includes a first signal processor adapted to receive clock, input and negative input signals and to output a first output signal to a first node, a second signal processor adapted to receive the first output signal, a negative clock signal, and first and second negative feedback signals and to output a second output signal to a second node, a third signal processor adapted to receive the second output, the input and the clock signals and to output a third output signal to a third node and prevent first and second voltages from being simultaneously applied to the third node, a fourth signal processor adapted to receive the second and third output signals and to output a fourth output signal to a fourth node, and a fifth signal processor adapted to receive the third and fourth output signals and to output a fifth output signal to a fifth node.