Display Driver Segmentation for Voltage Accuracy and Power
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Solution Overview
Problem
High-definition electro-optical panels require faster drive times, leading to increased amplification circuit capability, which results in higher power consumption and heat generation, while methods without feedback control suffer from voltage errors due to parasitic capacitances between data lines, causing display quality issues.
Innovation Solution
A display driver with multiple drive units, each including an amplification circuit and a drive assistance circuit that adjusts its capability based on gradation change information from adjacent units to correct voltage errors and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive capability of the amplification circuit is increased to achieve high definition with shortened drive time, then the settling time is reduced, but the power consumption increases and heat generation increases
Solution Approach 1:
The drive function is segmented into two parts: a preliminary drive circuit that performs initial voltage switching, and an amplification circuit that performs feedback control for precision. This segmentation allows the preliminary drive to handle the time-critical initial transition, reducing the burden on the amplification circuit and enabling shorter overall drive times without requiring excessive amplification circuit capability that would increase power consumption.
Solution Approach 2:
The preliminary drive circuit performs the initial voltage transition before the amplification circuit takes over. By pre-positioning the voltage close to the target value, the amplification circuit only needs to make minor adjustments, significantly reducing its settling time and power consumption requirements while maintaining high definition performance.
2Measurement precision
If feedback control is used to control data voltage to target voltage, then voltage accuracy is improved, but drive capability must be increased which increases power consumption
Solution Approach 1:
The control function is segmented between the preliminary drive circuit and the amplification circuit with feedback control. The preliminary drive handles the bulk voltage transition, while the amplification circuit with feedback control only needs to correct residual errors. This segmentation maintains voltage accuracy through feedback while reducing the overall power consumption by minimizing the amplification circuit's workload.
Solution Approach 2:
The preliminary drive circuit performs the major voltage transition in advance, bringing the voltage close to the target value before feedback control engages. This preliminary action reduces the correction range needed by the feedback control circuit, allowing it to achieve high voltage accuracy with lower power consumption.
3Use of energy by moving object
If feedback control is removed to reduce power consumption, then power consumption decreases, but voltage errors occur due to parasitic capacitances causing display quality degradation
Solution Approach 1:
The drive system is segmented into a preliminary drive circuit for initial voltage switching and an amplification circuit with feedback control for precision correction. This segmentation preserves feedback control (maintaining display quality) while optimizing power consumption by reducing the amplification circuit's workload through the preliminary drive's advance action.
Solution Approach 2:
The preliminary drive circuit performs the initial voltage transition in advance, compensating for the effects of parasitic capacitances before the amplification circuit with feedback control takes over. This preliminary action reduces voltage errors, allowing feedback control to maintain display quality with lower power consumption.
Data Source
AI summary
A display driver includes a plurality of output terminals that output a plurality of data signals to an electro-optical panel, and a drive circuit including a plurality of drive units that output the plurality of data signals. Each drive unit includes an amplification circuit and a drive assistance circuit assisting drive performed by the amplification circuit. Drive assistance capability of the drive assistance circuit of an ith drive unit changes on the basis of gradation change information of a drive unit other than the ith drive unit.