Display Pixel Circuits With Precharged Data Lines
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Solution Overview
Problem
As the density of pixel circuits in display devices increases, there is a need for higher current supply capability and reduced power consumption.
Innovation Solution
A display device with a configuration that includes multiple pixel circuits connected to data lines, a first and second voltage output unit generating ramp wave voltages, and ramp wirings that bring at least two data lines into a conductive state before outputting the voltages, utilizing switches to manage conductivity and incorporating capacitance units to hold image signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of pixel circuits is increased, then the display device can achieve higher resolution and better image quality, but the current supply capability requirement increases and power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-charging data lines to a first voltage level before ramp wave voltage is applied. This preliminary charging action reduces the voltage difference between data lines, thereby suppressing excessive current flow during the ramp wave voltage application and reducing power consumption while maintaining high pixel circuit density
Solution Approach 2:
The patent changes the voltage parameter of data lines by applying a first voltage (different from ground potential) before the ramp wave voltage is applied. This parameter change reduces the voltage differential that would otherwise cause excessive current flow, thus reducing power consumption while supporting high-density pixel circuits
2Measurement precision
If the density of pixel circuits is increased, then the display device can achieve higher resolution, but the current supply capability requirement increases
Solution Approach 1:
The patent applies preliminary action by pre-charging data lines to a first voltage level before ramp wave voltage is applied. This preliminary charging action reduces the voltage difference between data lines, thereby suppressing excessive current flow during the ramp wave voltage application and reducing power consumption while maintaining high pixel circuit density
Solution Approach 2:
The patent converts the potential harmful effect of voltage differences between data lines into a beneficial action. By applying a first voltage to data lines before ramp wave voltage, the voltage differences are controlled to suppress excessive current flow, transforming what would be a harmful current surge into a controlled charging process that reduces overall power 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 configuration reduces power consumption by sharing accumulated charges across data lines, minimizing excessive current flow and lowering the power supply capacitance of the ramp signal generation circuit.
Implementation Method 1
a capacitance unit, and a voltage corresponding to an image signal is held in the capacitance unit
Implementation Method 2
a first ramp wiring that supplies the first ramp wave voltage generated by the first voltage output unit to each of a plurality of data lines of a first group
Data Source
AI summary
Display devices with reduced power consumption are disclosed. In one example, a display device includes pixel circuits respectively connected to data lines in a first direction, a first voltage output unit that generates a first ramp wave voltage whose voltage level changes with time, and a first ramp wiring that supplies the first ramp wave voltage generated by the first voltage output unit to each of a plurality of data lines of a first group, in which at least two data lines of the plurality of data lines are brought into a conductive state before outputting the first ramp wave voltage to the first ramp wiring.