Display Driver Voltage Adjustment for Brightness Control
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Solution Overview
Problem
Conventional display apparatuses face issues with brightness control, where the brightness cannot reach target values when displaying a white screen and has low contrast when displaying a black screen, resulting in poor display quality due to limitations in adjusting operating voltages.
Innovation Solution
A display driver module that adjusts the negative operating voltage output to a light emitting device's cathode based on a brightness control factor, allowing the voltage to decrease or remain unchanged as display brightness increases, with specific voltage levels corresponding to different brightness intervals, enabling improved brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the data voltage Vdata is adjusted to control brightness while keeping Vdd and Vss unchanged, then the circuit structure remains simple, but the brightness cannot reach target values and display quality deteriorates
Solution Approach 1:
The patent changes the operating parameters by adjusting the negative operating voltage Vss in addition to the data voltage Vdata. By varying Vss according to brightness control factors, the patent achieves precise brightness control that can reach target values, resolving the limitation of only adjusting Vdata while maintaining simple circuit structure.
2Illumination intensity
If conventional brightness control methods are used with fixed Vdd and Vss, then the power supply unit operation is simple, but the contrast ratio is poor and display quality is low
Solution Approach 1:
The patent introduces dynamic voltage control by making Vss adjustable based on brightness control factors. The power supply unit dynamically adjusts Vss according to the brightness control factor, enabling high contrast ratio for both bright and dark screens while managing voltage control complexity through systematic adjustment strategies.
3Manufacturing precision
If the operating voltage is adjusted according to brightness control factor, then the brightness control precision is improved, but the power supply unit complexity increases
Solution Approach 1:
The power supply unit is designed to perform multiple functions: it provides both the positive operating voltage Vdd and the adjustable negative operating voltage Vss, and it responds to brightness control factors to adjust Vss. This multi-functionality achieves precise brightness control while consolidating control logic in a single unit, managing the complexity effectively.
Data Source
AI summary
The present disclosure provides a display driver module, a display apparatus and a voltage adjustment method. The display driver module comprises a source driving unit and a power supply unit. The source driving unit is configured to generate a voltage control signal according to an acquired brightness control factor, the power supply unit is configured to adjust an operating voltage output to a cathode of a light emitting device according to the voltage control signal, the operating voltage decreases or maintains unchanged as display brightness corresponding to the brightness control factor increases, and the operating voltage output by the power supply unit in response to the brightness control factor corresponding to minimum display brightness is greater than the operating voltage output by the power supply unit in response to the brightness control factor corresponding to maximum display brightness.