Display Driving Controller Frequency Optimization
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Solution Overview
Problem
Organic light emitting display devices face issues with power consumption due to leakage currents in transistors, particularly when the voltage level or operation frequency is lowered, affecting display quality.
Innovation Solution
A driving controller is introduced that includes a still image determination circuit and a driving frequency determination circuit, which divides image signals into segments, calculates average gray scale values, and adjusts driving frequencies based on these values to minimize power consumption by optimizing the driving frequency for still images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTPS transistors are used in circuit units, then high mobility and device stability are achieved, but leakage current is generated when voltage level or operation frequency is lowered
Solution Approach 1:
The patent changes the semiconductor material parameter from LTPS to oxide semiconductor, which fundamentally alters the electrical characteristics to achieve lower leakage current while maintaining acceptable mobility for display circuit operations
Solution Approach 2:
The patent employs a hybrid transistor architecture where LTPS transistors are used for switching functions requiring high mobility, while oxide semiconductor transistors are used for buffer/transmission functions where low leakage is critical, creating a composite circuit system that leverages the strengths of both material types
2Use of energy by moving object
If voltage level or operation frequency is lowered to reduce power consumption, then power consumption decreases, but leakage current is generated affecting display quality
Solution Approach 1:
The patent introduces oxide semiconductor transistors with fundamentally different electrical parameters (particularly lower off-state current) to enable operation at reduced voltage and frequency while maintaining signal integrity and minimizing leakage-related display defects
Solution Approach 2:
The oxide semiconductor transistor acts as an intermediary buffer element that can hold voltage levels stable over extended periods, enabling the system to operate at lower frequencies without accumulating leakage current that would degrade display quality
3Use of energy by moving object
If still image detection and dynamic frequency adjustment are implemented, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the circuit unit into distinct functional blocks (switching transistor, buffer transistor, capacitor) with specialized transistor types for each function, allowing independent optimization and simplified control of each segment's operation characteristics
Solution Approach 2:
The patent implements dynamic frequency adjustment by detecting still images and modifying the operation frequency of the oxide semiconductor transistor, creating a adaptive system that optimizes power consumption based on actual display content while using simple detection logic
Data Source
AI summary
A driving controller of a display device, the controller including a segment divider configured to divide the image signal into a plurality of segments and define a predetermined number of adjacent segments among the plurality of segments as a segment block, an image signal adder configured to add up a gray scale value of the image signal of each of the predetermined number of adjacent segments and output the added-up gray scale values, an average gray scale calculator configured to receive the added-up gray scale values and output an average gray scale value, a correction circuit configured to output corrected added-up gray scale values obtained by adding a weight value to each of the added-up gray scale values on the basis of the average gray scale value, and a driving frequency determiner configured to determine the driving frequency of the display device on the basis of the corrected added-up gray scale values.