TCON Chip Synchronization for LCD Brightness Uniformity
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Solution Overview
Problem
The use of two TCON chips in liquid crystal display devices leads to uneven image brightness and colors due to differences in detected frequencies and called tables, resulting in varying flipping voltage values and grayscale values for pixels.
Innovation Solution
A control method that involves a main TCON chip detecting the current pixel clock signal frequency, computing the frame rate, and synchronizing with an assist TCON chip to ensure both chips call the same table when frame rates change, thereby maintaining consistent scanning signals across the liquid crystal display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two TCON chips are used to detect clock signal frequencies, then the refresh rate can be maintained, but image brightness and colors become uneven due to different detection results
Solution Approach 1:
The patent merges the detection results from multiple TCON chips by selecting a reference frequency and using it as a common standard. All TCON chips synchronize their detection to this reference, eliminating the inconsistency caused by independent detection. This combining approach maintains the reliability of refresh rate while ensuring uniformity of image display across all chips.
Solution Approach 2:
The patent introduces a reference clock signal as an intermediary element that mediates between multiple TCON chips. This reference signal serves as a common timing standard that all chips use for frequency detection, thereby eliminating the phase differences and detection inconsistencies that would otherwise occur with independent detection mechanisms.
2Adaptability or versatility
If different tables are called by TCON chips based on detected frequencies, then frame rates can be adjusted, but flipping voltage values and grayscale values become inconsistent
Solution Approach 1:
The patent applies local quality by adjusting the detection threshold or reference frequency specifically for TCON chips that detect higher frequencies. Instead of uniformly treating all chips, it selectively modifies the detection parameters of specific chips to ensure they all converge to the same reference frequency, thereby calling the same table and maintaining consistent voltage and grayscale values.
Solution Approach 2:
The patent changes the detection parameter (frequency threshold or reference frequency) dynamically based on the detected clock signal. When a higher frequency is detected, the system adjusts the reference frequency accordingly and selects the appropriate table, ensuring that all TCON chips use consistent parameters for the same display conditions, thus maintaining uniformity in flipping voltage and grayscale values.
3Stability of the object's composition
If constant refresh rates are used, then display stability is maintained, but dynamic images with complicated geometric structures cannot be displayed smoothly
Solution Approach 1:
The patent introduces dynamics by allowing the refresh rate to be adjusted based on the complexity of the displayed content. For static or simple images, a lower constant refresh rate is used to maintain stability. For dynamic images with complicated geometric structures, the system detects the higher clock signal frequency and increases the refresh rate accordingly, enabling smooth motion display while maintaining overall system stability.
Solution Approach 2:
The patent implements periodic detection of clock signal frequencies to determine whether to switch between different refresh rates. The TCON chips periodically sample the input signal characteristics and adjust the refresh rate in response to changes in image complexity, creating a rhythm of stable display for simple content and high-speed refresh for complex dynamic content.
Data Source
AI summary
A control method of a time sequential control signal and a driving circuit are provided. A main TCON chip and an assist TCON chip compute corresponding frame rates according to pixel clock signal frequencies, then call a corresponding table, and transmit the table to a first driving unit and a second driving unit respectively. The first driving unit and the second driving unit respectively perform scanning on rows and columns of pixels to allow complicated dynamic images to be displayed with smooth motions.