Pixel Circuit Data Line Precharging for Display Driver Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display technologies, such as LEDs and OLEDs, face challenges in efficiently precharging data lines to optimize pixel brightness and power consumption, particularly in transitioning between darker and lighter states, which affects the overall efficiency and image quality of current-driven displays.
Innovation Solution
A display driver system that includes a digital to analog converter and a voltage source with a feedback loop, capable of precharging data lines to specific voltage levels based on previous frame data, adjusting for brightness differences, and using a memory to store voltage levels for each pixel, allowing for precise control of current flow and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data lines are precharged to higher voltage levels to improve pixel brightness transition speed, then the transition speed from dark to light states is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by precharging data lines to predicted voltage levels before pixel illumination. The system predicts the voltage level needed for the next frame based on previous frame data and brightness level differences, then precharges the data line to this predicted level during the line period. This prepares the data line in advance, enabling faster pixel brightness transitions when the illumination period begins, while avoiding the need to charge from a zero or baseline level, thus reducing overall power consumption.
Solution Approach 2:
The patent implements dynamics by making the precharge voltage level adaptive rather than fixed. The system dynamically adjusts the precharge voltage based on the predicted brightness level differences between frames. The voltage level is determined by analyzing previous frame data and calculating the expected brightness change, then setting the precharge voltage accordingly. This dynamic adjustment optimizes both transition speed and power consumption by applying the minimum necessary voltage for each specific transition requirement.
2Measurement precision
If data lines are precharged to optimize current flow control, then pixel brightness accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent applies feedback by using previous frame display data to predict and determine the precharge voltage level for the current frame. The system analyzes the brightness level differences between frames and uses this information to set an optimal precharge voltage that will achieve the desired pixel brightness accuracy. This feedback mechanism from previous frame data enables precise current flow control without requiring complex real-time measurement and adjustment circuits during the illumination period.
Solution Approach 2:
The patent uses preliminary action to perform brightness level calculations and precharge voltage determinations during the line period before illumination begins. By computing the predicted voltage level and setting the precharge voltage in advance, the system achieves accurate pixel brightness control during the illumination period without requiring complex real-time adjustment mechanisms, thus managing circuit complexity while maintaining precision.
3Illumination intensity
If voltage precharge levels are adjusted based on brightness level differences, then image quality is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by performing brightness level difference calculations and precharge voltage determinations during the line period, which occurs before the illumination period. The system analyzes previous frame data and computes the predicted voltage level needed for the current frame's brightness requirements. This advance preparation ensures optimal image quality during illumination without adding processing time during the critical illumination period, as all calculations are completed beforehand.
Solution Approach 2:
The patent implements continuity of useful action by overlapping the processing of current frame precharge voltages with the illumination of the previous frame. While pixels from the previous frame are being illuminated, the system continuously processes and prepares the precharge voltage levels for the current frame using previous frame data. This continuous utilization of processing time ensures that image quality optimization does not extend the overall frame processing time, as calculations are performed in parallel with ongoing operations.
Data Source
AI summary
A display driver according to one embodiment includes a digital to analog converter producing a current at a selected level an output of the digital to analog converter being coupleable to a data line of a display; and a voltage source being coupleable to the data line for precharging the data line. A method for precharging a data line of a display according to another embodiment includes determining a voltage level on a data line during a frame period; storing the voltage level; and prior to or during a subsequent frame period, precharging the data line voltage to a derivative of the stored voltage level. Additional systems and methods are claimed.