Source Driver Timing Control via Delay Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing source drivers in liquid crystal display devices experience unstable operation due to timing offsets between source line driving signals, caused by variations and tolerances in chip materials and manufacturing, leading to inconsistent performance.
Innovation Solution
A source driver with multiple output circuits and control circuits that include delay circuits, multiplexers, and inverters to generate and control switch signals, ensuring precise timing of source line driving signals by delaying and selecting switch signals, thereby stabilizing the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional source drivers are used without timing control circuits, then the device structure remains simple, but timing offsets between source line driving signals occur due to variations and tolerances in chip materials and manufacturing
Solution Approach 1:
The source driver is divided into multiple output circuits (first through nth output circuits), each with its own switch (S1 through Sn) and control circuit (231 through 23n). This segmentation allows independent timing control of each source line driving signal (OUT1 through OUTn), resolving the timing offset problem while maintaining modular simplicity.
Solution Approach 2:
Control circuits generate control signals (SW1 through SWn) in advance to precisely control when each switch activates. The control circuits prepare the timing control before the actual signal output, compensating for material variations and manufacturing tolerances proactively rather than reactively.
2Manufacturing precision
If delay circuits and multiplexers are added to control signal timing, then precise timing control is achieved, but the control circuit complexity increases
Solution Approach 1:
Delay circuits adjust the timing parameter of control signals by introducing controlled time delays. Multiplexers select between different control signals based on timing requirements. This changes the temporal parameters of the control signals to achieve precise synchronization without requiring fundamental redesign of the output circuits.
Solution Approach 2:
Control circuits act as intermediary components between the main signal path and the switches. These intermediaries (control circuits 231-23n) manage the timing complexity separately, allowing the main output circuits to remain relatively simple while achieving precise timing control through the intermediary control layer.
3Stability of the object's composition
If multiple control circuits with delay circuits are implemented, then timing offsets are eliminated, but the overall device complexity increases
Solution Approach 1:
Each control circuit (231 through 23n) performs multiple functions: generating control signals, delaying signals, and coordinating with multiplexers. This multi-functionality reduces the need for separate dedicated components for each timing adjustment function, thereby reducing overall device complexity while maintaining operational stability.
Data Source
AI summary
There is provided a source driver capable of controlling the timing of source line driving signals in a liquid crystal display device. The source driver includes a plurality of output circuits, each output circuit including an output buffer and a switch. The output buffer amplifies an analog image signal, and the switch outputs the amplified analog image signal as a source line driving signal in response to a control signal. The source driver further comprises a control circuit for generating the control signal, the control circuit comprising: a delay circuit delaying a switch signal and generating a delayed switch signal; and a multiplexer selecting one of the switch signal and the delayed switch signal in response to a selection signal and outputting the selected signal as the control signal.