OLED Display Controller with Dynamic Pulse Width Adjustment
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Solution Overview
Problem
Organic light emitting displays face challenges with high power consumption and reduced visibility in bright ambient environments, such as sunlight, due to the need for large current flow and voltage adjustments that can distort image quality.
Innovation Solution
The implementation of a controller system with optical sensors, gamma value selection, and luminance control mechanisms that adjust gradation voltage, saturation, and pulse width of emission control signals to optimize image visibility and reduce power consumption, including a pixel unit with scan lines, emission control lines, data lines, and controllers for generating and applying scan, emission control, and data signals based on ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large amount of current is used through the OLED to achieve bright light emission, then the brightness of the display is improved, but the power consumption increases significantly
Solution Approach 1:
The patent implements dynamic control of the emission control signal pulse width based on ambient light conditions. The controller adjusts the pulse width of the emission control signal dynamically - using longer pulse widths in dark environments and shorter pulse widths in bright environments - to optimize both brightness and power consumption according to actual viewing conditions
Solution Approach 2:
The patent changes the pulse width parameter of the emission control signal based on ambient light intensity. By varying this temporal parameter rather than maintaining a fixed current level, the system achieves adaptive brightness control that reduces power consumption in bright environments while maintaining adequate visibility
2Use of energy by moving object
If the drive voltage is decreased to reduce power consumption, then the power consumption is reduced, but the display quality becomes distorted with dark portions appearing
Solution Approach 1:
The system dynamically adjusts the pulse width of emission control signals rather than using a fixed reduced voltage approach. This dynamic temporal control allows the OLED to receive adequate energy during the active emission period while maintaining lower average power consumption, preserving display quality without the dark portion distortion caused by simply reducing drive voltage
Solution Approach 2:
The patent employs periodic emission control signals with variable pulse widths. By concentrating current delivery into optimized periodic pulses rather than continuous low-voltage operation, the system maintains peak display quality during emission while reducing overall power consumption through controlled off-periods
3Illumination intensity
If the current through the OLED is increased to improve visibility in bright environments, then the visibility is improved, but the power consumption increases
Solution Approach 1:
The controller dynamically adapts the pulse width of emission control signals based on real-time ambient light sensor feedback. In bright environments, the system uses longer pulse widths to increase visibility without requiring proportionally higher current levels, thereby improving visibility while controlling power consumption through temporal rather than purely amplitude-based adjustments
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
This solution effectively reduces power consumption and enhances image visibility in varying ambient light conditions without significantly degrading image quality, ensuring improved performance in both low and high illumination settings.
Implementation Method 1
an optical sensor configured to generate an optical sensing signal corresponding to an intensity of ambient light
Implementation Method 2
application of voltage to the electrodes may cause re-combination of electrons and holes in the OLED, thereby emitting light to form images
Data Source
AI summary
A display driven by a data signal and a light emission signal may be controlled by a control system including a first through fourth controller. The first controller may select a gamma value in accordance with ambient illumination and output a corresponding gamma compensation signal to control a gradation voltage of input image data. The second controller may compare the ambient illumination with a reference value, generate a selection signal in response thereto, and provide changed image data obtained by changing input image data in accordance with the selection signal as the data signal. The third controller may apply a scaling factor to the input image data generated from extracted features related to the input image data and a scale ratio obtained from the extracted features, and output scaled image data as the data signal. The fourth controller may control a pulse width of the emission control signal.