Dynamic Luminous Time Control for OLED Current Overflow
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Solution Overview
Problem
Typical luminous time control techniques for self-luminescence display devices cannot adjust luminous time per unit time based on input picture signals, leading to current overflow in luminescence elements and limited display quality adjustments.
Innovation Solution
A display device with luminescence elements arranged in a matrix pattern, featuring an adjustment signal generator, luminous time setter, and upper limit value setter to dynamically control luminous time per unit time based on picture information, preventing current overflow and allowing for changes in display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminous time per unit time is shortened and signal level is lowered to reduce average luminance, then the average luminance is reduced, but the luminescence amount becomes much too large for extremely high luminance inputs, causing current overflow into the luminescence elements
Solution Approach 1:
The patent applies dynamics by making the luminous time control adjustable and adaptive rather than fixed. The control unit dynamically adjusts the luminous time based on the average luminance of the picture signal, allowing the system to optimize between reducing average luminance and preventing current overflow for different input conditions. This dynamic control resolves the contradiction by adapting the luminous time to the specific luminance level being displayed.
2Device complexity
If a constant luminous time is set for particular average luminance, then the control is simplified, but the display quality cannot be changed or adjusted
Solution Approach 1:
The patent implements dynamics by providing an adjustable luminous time control mechanism. Instead of using a fixed constant luminous time, the system allows the luminous time to be modified based on picture signal characteristics and display requirements. This enables display quality adjustment while maintaining simplified control through automated adaptation to the input signal.
Solution Approach 2:
The patent applies parameter changes by allowing the luminous time parameter to be varied according to the average luminance of the picture signal. The control unit modifies the luminous time parameter dynamically based on the displayed picture signal's luminance characteristics, enabling both simplified automated control and adjustable display quality through parameter adaptation.
3Adaptability or versatility
If the luminous time is increased to improve display quality, then the display quality improves, but the current flowing into the luminescence elements increases, causing current overflow
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminous time parameter based on the average luminance of the picture signal. When the picture signal has low average luminance, the luminous time can be increased to improve display quality. When the picture signal has high average luminance, the luminous time is reduced to prevent current overflow. This parameter adaptation resolves the contradiction by optimizing luminous time for different luminance conditions.
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
Effectively controls luminous time per unit time to prevent current overflow and enhances display quality by adjusting luminous time settings according to input picture signals, ensuring optimal performance and image quality.
Implementation Method 1
organic EL displays (organic ElectroLuminescence displays, also called as OLED displays (Organic Light Emitting Diode displays)) have been developed as devices to replace CTR displays (Cathode Ray Tube displays)
Data Source
AI summary
Provided is a display device including a display unit having luminescence elements that individually becomes luminous depending on a current amount. The luminescence elements are arranged in a matrix pattern. The display device includes an adjustment signal generator for generating an adjustment signal for adjusting an effective duty regulating a luminous time per unit time. The luminescence elements are luminous for the luminous time. The display device also includes a luminous time setter for setting the effective duty equal to or lower than an upper limit value provided for the effective duty to be set, according to picture information of an input picture signal, so that a total luminescence amount per unit time is limited, at which amount the luminescence elements of the display unit are luminous. The display device further include an upper limit value setter for changing the upper limit value of the luminous time setter, depending on the adjustment signal output from the adjustment signal generator based on an operation.