N-Phase Level Shifter for Display Compensation
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Solution Overview
Problem
Conventional organic light-emitting display devices experience degradation in display quality due to transistor characteristics and organic light-emitting element degradation, leading to reduced image quality.
Innovation Solution
A method is proposed to sense and compensate the characteristics of driving transistors in real-time by using an N-phase level shifter to generate sensing clock signals, allowing for efficient compensation of multiple gate lines during a blank period, thereby improving image quality and compensation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If real-time sensing and compensation of driving transistor characteristics is implemented, then image quality is improved, but device complexity increases
Solution Approach 1:
The gate lines are divided into multiple groups, with each group assigned to a separate sensing operation. The level shifter generates multiple sensing clock signals (first, second, third sensing clock signals) that are sequentially applied to different gate line groups during the blank period, enabling parallel processing of compensation for multiple gate lines without requiring all gates to be active simultaneously
Solution Approach 2:
The sensing operations are performed during the blank period, which occurs before the display of the subsequent image. This preliminary sensing allows the system to compensate for transistor characteristics degradation before it affects image quality, using the blank period that would otherwise be idle time in the display cycle
2Productivity
If multiple gate lines are sensed during one blank period, then compensation efficiency is improved, but device complexity increases
Solution Approach 1:
The level shifter generates multiple periodic sensing clock signals (first, second, third sensing clock signals) with different phases and frequencies. These periodic signals are applied sequentially to different groups of gate lines during the blank period, enabling the system to sense and compensate for multiple gate lines in a structured, repeating pattern without requiring continuous high-complexity control
Solution Approach 2:
The system dynamically adjusts the sensing operation by selectively enabling different groups of gate lines for sensing based on the current sensing phase. The level shifter dynamically generates and switches between multiple sensing clock signals, allowing flexible allocation of sensing resources to different gate line groups as needed, optimizing the balance between compensation efficiency and control complexity
Data Source
AI summary
A display device includes an N-phase level shifter configured to receive an output cancellation signal, a first reference signal, and a second reference signal from a timing controller, and to output N sensing clock signals to a gate driver, and the gate driver configured to receive the N sensing clock signals from the N-phase level shifter, and to output N sensing output signals to first to n-th gate lines, wherein the N-phase level shifter is configured to receive the output cancellation signal having a number of pulses during a blank period, and the a is at least two.