Display Device Brightness Control for Sunlight Visibility
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Solution Overview
Problem
Display devices, particularly in mobile phones, face challenges in visibility under strong sunlight and readability of text due to inadequate brightness and timing for photographing, as they are not designed to operate effectively in such conditions.
Innovation Solution
A display device with a signal controller that generates weighted image data and adjusts scan and data signal frequencies and levels in accordance with the number of frames in a unit frame period, increasing energy proportionally to improve visibility, especially during camera use or text display, by using organic light emitting diodes to enhance brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device operates at standard brightness levels, then power consumption is controlled, but visibility under strong sunlight and readability of text deteriorate
Solution Approach 1:
The display device implements periodic frame updates with variable refresh rates. During camera operation or text display modes, the controller increases the frame rate to multiple frames per display update cycle, creating periodic high-brightness intervals that improve visibility while maintaining lower average power consumption during normal operation
Solution Approach 2:
The display brightness and frame rate are dynamically adjusted based on operational mode. The controller detects camera operation or text display conditions and automatically increases the frame rate and brightness during these periods, then reduces them during normal operation, creating an adaptive system that optimizes both visibility and power consumption
2Productivity
If the frame rate is increased to improve visibility during camera operation, then visibility and photographing timing detection improve, but power consumption and processing load increase
Solution Approach 1:
The system employs periodic high-frame-rate updates only during specific operational modes (camera operation, text display) rather than maintaining high frame rates continuously. This periodic action provides visibility improvements when needed while reducing overall power consumption by operating at lower frame rates during normal display modes
Solution Approach 2:
The controller dynamically changes the frame rate parameter based on operational conditions. During camera operation or text display, the frame rate is increased to multiple frames per display update cycle, while during normal operation, it operates at standard frame rates, optimizing the balance between visibility and power consumption
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 enhances field visibility and makes it easier to determine photographing timing and read text by increasing the brightness and energy of the displayed images proportionally with the number of frames, improving the overall display performance under various lighting conditions.
Implementation Method 1
each of the plurality of pixels includes an organic light emitting diode for emitting light by a current corresponding to a difference between the data signal and a set power voltage
Data Source
AI summary
A display device and a driving method thereof for easily determining photographing timing and recognizing text by improving field visibility. The display device includes: a signal controller generating image data and an image control signal in accordance with an input signal; and a display unit including scan lines transmitting scan signals, data lines transmitting data signals, and pixels connected to the scan lines and data lines and displaying an image corresponding to the image data. Here, when the input signal is an image signal for displaying a photographed image or text, the signal controller generates the image data to correspond to a unit frame period composed of frames as weighted image data corresponding to one of the frames, and the display device displays an image corresponding to the weighted image data to have an energy proportional to a number of the frames in the unit frame period.