EL Display Driver Using Homogeneous N-Type Transistors
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Solution Overview
Problem
Conventional organic electroluminescent displays require separate external drivers for p-type and n-type transistors, leading to increased size, weight, and manufacturing complexity, with additional processing steps and potential issues like power loss and heat generation due to simultaneous application of power voltages.
Innovation Solution
Implementing a light emitting control driver with only one type of transistor (either p-type or n-type) and using switching elements to prevent simultaneous application of power voltages, thereby simplifying the manufacturing process and 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 functionality is improved, but the device size and manufacturing complexity increase
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, while maintaining full driving functionality through clever circuit design that compensates for the single transistor type limitation
2Ease of operation
If separate external drivers are used for p-type and n-type transistors, then the transistor control is improved, but the display device size and weight increase
Solution Approach 1:
The patent merges the light emitting control driver with the pixel circuit by integrating it directly into the display device substrate. This integration eliminates the need for separate external drivers, reducing both the size and weight of the display device while maintaining proper transistor control through the unified circuit architecture
3Adaptability or versatility
If additional processing steps are implemented for both n-type and p-type transistors, then the transistor type compatibility is improved, but the manufacturing time and cost increase
Solution Approach 1:
By using only n-type transistors throughout the display device, the patent eliminates the need for separate processing steps required for p-type transistors. This homogeneous approach simplifies the manufacturing process, reduces production time, and lowers manufacturing costs while maintaining full functionality through the integrated circuit design
4Power
If both power voltages are applied simultaneously, then the power delivery is improved, but power loss and heat generation increase
Solution Approach 1:
The patent implements periodic action by sequentially applying first and second power voltages to the n-type transistor rather than simultaneously. The switching element controls the timing, applying one voltage then the other in sequence, which prevents the harmful interaction that causes power loss and heat generation while still achieving the desired power delivery for transistor operation
Data Source
AI summary
A driver of an electroluminescent display includes a first signal processor adapted to receive clock, input and negative input signals and to generate a first output signal, a second signal processor adapted to receive the first output signal, a negative clock signal, a first negative feedback signal and a second negative feedback signal and to generate a second output signal, a third signal processor adapted to receive the second output signal, the input signal and the clock signal and to generate a third output signal, and a fourth signal processor adapted to receive the second and third output signals and to generate a fourth output signal, wherein the third signal processor includes a switching element for preventing first and second power voltages from being applied to the third output signal simultaneously.