Display Screen Drive Control Using Shared Gain Amplifiers
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Solution Overview
Problem
Traditional display screen drive-control methods require large-scale circuits, high costs, and high power consumption due to the need for separate digital-to-analog converters, gain amplifiers, and gray-scale voltage generating circuits for each column channel.
Innovation Solution
A drive-control method and apparatus that uses a look-up table to determine charging-discharging target counts for each column channel, allowing for simultaneous charging or discharging of all column channels using a counter and comparators, eliminating the need for complex circuit structures like DACs and gain amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional separate DAC and gain amplifier circuits are used for each column channel, then gray-scale voltage control precision is improved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent merges the DAC and gain amplifier functions into a single integrated column drive circuit. Instead of having separate DACs and gain amplifiers for each column channel, the invention uses one DAC that can switch between different gain amplifiers shared across multiple column channels, thereby reducing overall circuit complexity while maintaining gray-scale voltage control precision.
Solution Approach 2:
The column drive circuit is designed with multi-functionality where a single DAC can serve multiple column channels by switching between different gain amplifiers. This universal design allows the same hardware resources to perform multiple functions, reducing the total number of components needed while preserving the ability to generate precise gray-scale voltages for all column channels.
2Measurement precision
If separate DACs and gain amplifiers are allocated for each column channel, then charging-discharging control accuracy is improved, but power consumption increases
Solution Approach 1:
The patent combines multiple gain amplifiers into a shared resource that can be selectively activated for different column channels. This merging approach reduces the total number of active components at any given time, thereby lowering overall power consumption while maintaining the ability to provide accurate charging-discharging control to each column channel through time-division or signal-division multiplexing.
Solution Approach 2:
The invention employs periodic switching between different gain amplifiers for different column channels. Instead of having all gain amplifiers active simultaneously, the system periodically activates only the necessary gain amplifier for the currently being-driven column channel, significantly reducing the average power consumption while preserving control accuracy through timely signal generation.
3Adaptability or versatility
If multiple separate circuits are used for column channel drive-control, then gray-scale voltage generation capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple separate circuit blocks (DACs and gain amplifiers) into a more compact integrated structure. By combining these functions into fewer, larger-scale integrated circuits or using CMOS process techniques, the manufacturing complexity and cost are reduced while the gray-scale voltage generation capability remains intact through functional equivalence.
Solution Approach 2:
The invention creates a universal column drive circuit architecture that can generate gray-scale voltages for multiple column channels using a smaller set of standardized components. This multi-functional design simplifies the manufacturing process by reducing the variety of unique circuit designs that need to be produced, thereby lowering manufacturing costs while maintaining full adaptability for gray-scale voltage generation.
Data Source
AI summary
The present invention provides a drive-control method and control apparatus of display screens, and a display screen thereof, the method includes: determining a staged target gray-scale value of all sub-pixels in the currently scanned row, based on a current gray-scale value of each sub-pixel, the staged target gray-scale value and a pre-stored look-up table, determining the charging-discharging target count corresponding to each column channel in the current scan row, terminating the charging-discharging of the column channel, when the count of the counter is consistent with the target count corresponding to the charging or discharging of each column channel. The present invention in implementation not only has simple structure and a small scale circuit, but also low power consumption.