Display Driver Circuit with Variable Duty Ratio Buffer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving high image quality and efficient control of light emission for large panel displays, particularly in realizing 3D stereoscopic images, due to complex circuit interfaces and high off-current issues in thin film transistor circuits.
Innovation Solution
A driving device utilizing 2-phase clock signals to generate a driving signal with a variable duty ratio, incorporating a buffer with transistors and capacitors to control voltage levels and synchronize clock signals, allowing for flexible timing and simplified circuit design, enabling concurrent or sequential light emitting modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional light emission control driver is used for large panel displays, then the circuit interface becomes complex, but the image quality and 3D stereoscopic image realization are insufficient
Solution Approach 1:
The driver is divided into multiple shift registers, each independently controlling light emission for different time periods. This segmentation allows complex 3D stereoscopic image control to be broken down into manageable sequential operations, improving image quality without requiring a monolithically complex circuit interface
Solution Approach 2:
The driver uses periodic clock signals to sequentially control light emission across different time periods. This periodic action enables the display to present different image data (including 3D stereoscopic content) in a systematic temporal sequence, achieving high image quality through time-multiplexed control rather than spatial complexity
2Ease of manufacture
If thin film transistor circuits with large off current are used, then the yield of built-in circuit improves, but the off current leakage becomes significant
Solution Approach 1:
The circuit performs preliminary charging of capacitors during non-light-emission periods and preliminary control of transistor switching states. This preliminary action ensures that when light emission occurs, the transistors are in optimal states, minimizing off-current leakage during critical periods while maintaining manufacturing yield through robust thin film transistor design
Solution Approach 2:
The driver maintains continuous useful action by seamlessly transitioning between sequential light emission modes and concurrent light emission modes. This continuity allows the system to optimize transistor operation states dynamically, reducing off-current leakage through continuous adaptive control rather than static operation
3Device complexity
If fixed duty ratio driving is used, then the circuit design is simple, but the adaptability to different light emitting methods is limited
Solution Approach 1:
The driver dynamically adjusts the duty ratio of light emission control signals based on the selected operating mode (sequential or concurrent light emission). This dynamic adaptation allows the same circuit design to efficiently support multiple light emitting methods without requiring separate fixed-duty-ratio circuits for each mode, achieving versatility without proportionally increasing complexity
Data Source
AI summary
A driving device comprises: a first driver driven by a first input signal and generating a first interim output signal controlled by a first clock signal; a second driver driven by a second input signal and generating a second interim output signal controlled by a second clock signal; and a plurality of shift registers including a buffer driven by the first interim output signal and the second interim output signal and generating an output signal controllable by the first clock signal and the second clock signal. The buffer includes a second transistor connected to a gate electrode of a first transistor for transmitting a voltage with a first level with the output signal and transmitting a voltage with a second level for turning off the first transistor.