Source Driver Slew Rate Boosting for High-Resolution Displays
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Solution Overview
Problem
As display screen resolution increases, the number of pixels to be driven simultaneously leads to slower voltage conversion rates in Source Driver ICs, resulting in abnormal image quality and increased IC temperature due to increased capacitance and shorter pixel drive time.
Innovation Solution
A slew rate boosting circuit is introduced, comprising a first latch, second latch, first level shifter, amplifier, and slew rate boosting module, which adjusts the output stage voltage of the amplifier based on specified bits of input data to enhance the slew rate, using a pattern detection module and charging module to determine when and how to boost the slew rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display screen increases, then the image quality is improved, but the voltage conversion rate (slew rate) is slowed down
Solution Approach 1:
The patent applies preliminary action by detecting the data transition pattern in advance (comparing current data with previous data) and preparing the charging voltage before the actual voltage conversion is needed. When a large transition is predicted, the charging module pre-charges the output node, ensuring the amplifier can rapidly respond to the upcoming voltage change requirement, thus maintaining high slew rate even with increased resolution.
Solution Approach 2:
The patent implements dynamics by making the charging voltage dynamically adjustable based on the detected data transition pattern. The charging voltage is not fixed but varies according to the transition magnitude detected by comparing current and previous data values. This dynamic adjustment allows the circuit to optimize its charging behavior in real-time, providing higher charging voltage when large transitions are detected and lower voltage when small transitions occur, thereby maintaining high slew rate adaptively.
2Measurement precision
If the number of pixels to be driven increases, then the display resolution is improved, but the time taken to drive each pixel decreases
Solution Approach 1:
The patent applies preliminary action by detecting the data transition pattern in advance (comparing current data with previous data) and preparing the charging voltage before the actual voltage conversion is needed. When a large transition is predicted, the charging module pre-charges the output node, ensuring the amplifier can rapidly respond to the upcoming voltage change requirement, thus maintaining high slew rate even with increased resolution.
Solution Approach 2:
The patent implements dynamics by making the charging voltage dynamically adjustable based on the detected data transition pattern. The charging voltage is not fixed but varies according to the transition magnitude detected by comparing current and previous data values. This dynamic adjustment allows the circuit to optimize its charging behavior in real-time, providing higher charging voltage when large transitions are detected and lower voltage when small transitions occur, thereby maintaining high slew rate adaptively.
3Area of stationary object
If the capacitance of the screen increases, then the display area is enlarged, but the time taken to drive the pixels increases
Solution Approach 1:
The patent applies preliminary action by detecting the data transition pattern in advance (comparing current data with previous data) and preparing the charging voltage before the actual voltage conversion is needed. When a large transition is predicted, the charging module pre-charges the output node, ensuring the amplifier can rapidly respond to the upcoming voltage change requirement, thus maintaining high slew rate even with increased resolution.
Solution Approach 2:
The patent implements dynamics by making the charging voltage dynamically adjustable based on the detected data transition pattern. The charging voltage is not fixed but varies according to the transition magnitude detected by comparing current and previous data values. This dynamic adjustment allows the circuit to optimize its charging behavior in real-time, providing higher charging voltage when large transitions are detected and lower voltage when small transitions occur, thereby maintaining high slew rate adaptively.
4Speed
If the slew rate is boosted, then the voltage conversion rate is improved, but the circuit complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the slew rate boosting function into separate modular components: a pattern detection module that compares data values, a charging module that conditionally applies charging voltage, and the existing amplifier. This modular segmentation allows each component to perform a specific function independently, making the overall system easier to design, implement, and maintain while achieving the desired slew rate enhancement without excessive complexity.
Data Source
AI summary
A slew rate boosting circuit, a source driver chip and a display device are provided in the present disclosure. The slew rate boosting circuit comprises: a first latch configured to receive and store first data; a second latch configured to receive and store second data, the second data being next to the first data; a first level shifter; an amplifier; and a slew rate boosting module configured to receive a high voltage data signal as current input data, and adjust a slew rate of an output stage of the amplifier according to a value of a specified bit of the first data, a value of a specified bit of the second data and the current input data.