Display Control Circuit for Sub-Pixel Charging Brightness
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Solution Overview
Problem
In liquid crystal display devices, the first row of sub-pixels often appears darker due to insufficient charging, as they are not fully charged compared to other rows, resulting from the alternating current driving method that maintains a lower actual charging voltage.
Innovation Solution
A display control apparatus with a data driver, timing controller, and control circuit that outputs different currents based on a frame start signal and normal signal, where the control circuit inputs a higher first current during the frame start to ensure faster charging of the first row of sub-pixels and a lower second current for other rows, using N-type and P-type field effect transistors to manage current sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternating current is used for driving to avoid polarization of liquid crystal, then liquid crystal polarization is avoided, but the first row of sub-pixels becomes darker due to insufficient charging
Solution Approach 1:
The patent applies local quality by providing different current levels to different rows of sub-pixels. Specifically, a first current level is provided to the first row of sub-pixels while a second current level is provided to other rows, allowing the first row to receive enhanced charging current to compensate for the darkness issue while other rows maintain normal operation.
Solution Approach 2:
The patent changes the current parameter dynamically based on the row being driven. The control circuit is configured to output different current levels (first current level for first row, second current level for other rows) according to the scanning signal, thereby adjusting the charging parameters to resolve the brightness inconsistency caused by alternating current driving.
2Productivity
If higher current is provided to first row of sub-pixels to improve charging, then charging speed and brightness are improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by providing enhanced current only to the first row of sub-pixels that requires it, while other rows continue to receive normal current levels. This localized approach improves charging speed where needed without unnecessarily increasing energy consumption across the entire display.
Solution Approach 2:
The patent uses partial action by applying the higher first current level only to the first row of sub-pixels during specific scanning periods, rather than continuously to all rows. This partial application of excessive current achieves the necessary charging effect while minimizing overall energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that the first row of sub-pixels is fully charged in a shorter time, reducing energy consumption and improving display brightness, while maintaining efficient charging of other rows.
Implementation Method 1
The control circuit includes an N-type field effect transistor, a first current source, a P-type field effect transistor, and a second current source, wherein a gate electrode of the N-type field effect transistor is electrically connected to the timing controller and receives the data control signal
Data Source
AI summary
A display control apparatus includes a data driver, a timing controller, and a control circuit. The data driver a data output circuit that is configured to output data signals. The timing controller is configured to output data control signals that control the signal input of the data driver and include a frame start signal VS1 and a conventional signal VS2. The control circuit is electrically connected with the timing controller and the data output circuit (211), and is configured to input signals to the data output circuit according to the data control signals.