Data Driving Circuit with Compensation Control Signal
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Solution Overview
Problem
The existing data driving circuits for display apparatuses experience increased power dissipation and reduced standby time due to significant voltage level changes when switching between frames, particularly when transitioning from low to high voltage levels.
Innovation Solution
The data driving circuit incorporates a second latch circuit that generates a compensation control signal based on the comparison of sampled signals across different frames, allowing for reduced voltage changes between frames by setting the data line voltage before applying the driving voltage, thereby minimizing power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the data driving circuit applies driving voltage directly without compensation, then the circuit operation is simple, but power dissipation increases significantly when voltage levels change between frames
Solution Approach 1:
The patent applies preliminary action by introducing a compensation period before the display period, during which the data driving circuit adjusts the voltage level of data lines in advance. The compensation control signal is generated based on the difference between current and previous frame data, enabling the circuit to pre-adjust voltage levels and minimize power dissipation when the main driving voltage is applied, rather than applying voltage directly without preparation.
Solution Approach 2:
The patent uses an intermediary approach by introducing a compensation control signal as a mediator between the input image data and the driving voltage output. This compensation control signal carries information about voltage level changes and guides the data driving circuit to adjust data line voltages appropriately, acting as an intermediary mechanism that reduces power dissipation without requiring complete redesign of the driving circuit architecture.
2Loss of energy
If the data driving circuit reduces voltage changes between frames, then power dissipation decreases, but image display quality may be affected
Solution Approach 1:
The patent implements feedback by generating the compensation control signal based on the difference between current frame data and previous frame data. This feedback mechanism allows the circuit to detect when voltage level changes are needed and adjust the compensation accordingly, ensuring that image display quality is maintained while minimizing unnecessary voltage changes that would increase power dissipation. The feedback loop continuously monitors data changes and adjusts compensation in real-time.
Data Source
AI summary
A data driving circuit of reduced power consumption by smoothing large voltage changes includes a shift register circuit, a first latch, a second latch, a level shift circuit, a digital-to-analog (DAC) circuit, and an output circuit. The first latch circuit samples the digital signal, the second latch circuit detects a boundary value of the sampled signal in a specified grayscale range. The boundary value of the sampled signal is compared with the boundary value of a previous sampled signal and if different from the previous boundary value, the second latch outputs a compensation control signal being effective; the output circuit sets the voltage of the data line at a specified voltage before outputting the driving voltage to the data line. A display apparatus is also disclosed.