Display Data Driver with Shared Amplifiers for Lower Power
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Solution Overview
Problem
Conventional display devices with RGBG arrangements face power consumption issues due to data lines alternately charging/discharging for light emitting elements of different colors, leading to inefficiencies and increased power usage.
Innovation Solution
A data driver with a first amplifier outputting data voltages to multiple data lines, including a connection line linking first and second data lines, and second amplifiers for third data lines, reducing the number of amplifiers needed and optimizing power consumption by connecting data lines to pixel driving circuits displaying the same color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data lines are connected to light emitting elements of different colors alternately, then resolution can be increased, but power consumption increases due to charging/discharging of data lines
Solution Approach 1:
The patent segments the data lines into separate groups based on the color of light emitting elements they connect to. Specifically, first data lines connect only to first color light emitting elements, second data lines connect only to second color light emitting elements, and third data lines connect only to third color light emitting elements. This segmentation prevents the charging/discharging power consumption issue that occurs when data lines alternately connect to different colored elements, while still maintaining the RGBG arrangement for high resolution.
2Productivity
If the number of amplifiers is increased to output data voltages to multiple data lines, then data driving capability is improved, but device area and manufacturing cost increase
Solution Approach 1:
The patent makes a single amplifier serve multiple data lines by enabling it to alternately output data voltages to different groups of data lines. The amplifier can output first data voltages to first data lines, second data voltages to second data lines, and third data voltages to third data lines at different time periods. This multi-functionality reduces the total number of amplifiers needed while maintaining comprehensive data driving capability across all data lines.
Data Source
AI summary
A display device includes a display panel including pixel driving circuits and light emitting elements, a data driver that outputs data voltages to the pixel driving circuits, and a timing controller that controls the data driver. The data driver includes a first amplifier and second amplifiers. The first amplifier outputs first data voltages to a first data line connected to first pixel driving circuits arranged in a first column and output second data voltages to a second data line connected to second pixel driving circuits arranged in a second column. The second amplifiers output third data voltages to third data lines connected to third pixel driving circuits arranged in third columns which are disposed between the first column and the second column. Thus, the display device reduces the number of amplifiers included in the data driver.