Display Power Voltage Control Circuit for Frame Frequency Adaptation
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Solution Overview
Problem
Existing display devices face issues with luminance changes and reduced power consumption efficiency when changing frame frequency, as the fixed power voltage leads to varying charging amounts and degraded display quality.
Innovation Solution
A display device with a power voltage control circuit that adjusts the gate and data power voltages based on detected frame frequency, minimizing luminance changes and optimizing power consumption by adjusting the voltage levels in response to frame frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the frame frequency is changed from 60 Hz to 40 Hz to reduce power consumption, then power consumption is reduced, but the charging amount varies causing luminance changes and degraded display quality
Solution Approach 1:
The patent adjusts the data voltage level parameter according to frame frequency. When frame frequency changes from 60 Hz to 40 Hz, the data voltage level is modified to compensate for the increased charging time, thereby maintaining consistent luminance output while achieving power consumption reduction. This parameter adjustment resolves the contradiction by allowing both lower power consumption and maintained display quality.
2Use of energy by stationary object
If the frame frequency is decreased to reduce power consumption, then power consumption is reduced, but the charging time increases causing varying charging amounts
Solution Approach 1:
The patent modifies the data voltage level parameter in response to frame frequency changes. When charging time increases due to lower frame frequency (40 Hz), the data voltage level is adjusted to maintain appropriate charging amount, thereby resolving the contradiction between extended charging duration and power consumption efficiency.
3Device complexity
If the power voltage is kept fixed to simplify the circuit, then device complexity is reduced, but luminance changes occur when frame frequency changes
Solution Approach 1:
The patent introduces a frame frequency detection unit and a data voltage generation unit that adjusts voltage levels based on detected frame frequency. This dynamic parameter adjustment resolves the contradiction by maintaining luminance consistency across different frame frequencies while adding only minimal circuit complexity for detection and adjustment.
Data Source
AI summary
A display device includes a display panel having a plurality of gate lines and a plurality of data lines crossing each other and pixels formed at intersections thereof; a gate driving circuit that generates a gate pulse based on a gate power voltage and applies the gate pulse to the gate lines; a data driving circuit that divides the data power voltage to convert input digital video data into an analog data voltage and applies the data voltage to the data lines; a power voltage control circuit that detects an input frame frequency and generates a different power control signal in accordance with the detected frame frequency; and a power voltage adjusting circuit that adjusts at least one of the gate power voltage and the data power voltage differently from a predetermined reference level in response to the power control signal.