OLED Brightness Controller with Adjustable Emission Signal Width
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Solution Overview
Problem
Conventional organic light emitting displays face high power consumption and inability to adjust brightness according to user requests, as the brightness is solely dependent on external data input without user control.
Innovation Solution
An organic light emitting display system that includes a brightness controller with look-up tables and a method to generate emission control signals, allowing for adjustable brightness by modifying the widths of emission control signals based on image data and user input modes, thereby reducing power consumption and memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of pixels emitting light is increased to improve display quality, then the brightness and image quality are improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the emission control signal width adjustable rather than fixed. The brightness controller dynamically modifies the width of emission control signals based on user-selected modes (e.g., normal mode, power saving mode, eye protection mode), allowing the display to adapt its power consumption and brightness levels to different operational requirements.
Solution Approach 2:
The patent changes the parameter of emission control signal width to control brightness levels. By varying the width of emission control signals according to different operational modes, the system achieves different brightness levels and power consumption characteristics without changing the physical display structure.
2Illumination intensity
If the emission control signal width is increased to improve brightness, then the display brightness is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the emission control signal width based on user mode selections. In power saving modes, the width is reduced to lower brightness and power consumption, while in normal or eye protection modes, the width is increased to maintain adequate brightness, thus dynamically balancing brightness and power consumption requirements.
3Adaptability or versatility
If user brightness control is added to meet user requests, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The brightness controller serves multiple functions: it controls brightness based on emission control signal width, implements power saving modes, provides eye protection modes, and responds to user inputs. By making this single component multi-functional, the patent avoids adding separate control circuits for each function, thus limiting the increase in device complexity while maintaining high adaptability.
Solution Approach 2:
The brightness controller acts as an intermediary between the emission control signals and the display pixels. It receives emission control signals, modifies their widths according to user mode selections, and outputs adjusted control signals to the pixels, thereby simplifying the overall control architecture by centralizing the brightness adjustment function.
4Productivity
If memory requirements are reduced to improve device efficiency, then the device efficiency is improved, but the storage capacity for control data is reduced
Solution Approach 1:
The patent extracts the brightness control functionality from the main display control system and places it in a separate brightness controller. This extracted controller handles only the necessary brightness adjustment tasks using minimal memory for storing mode-specific control data, thereby reducing overall memory requirements while maintaining device efficiency.
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
Enables user-controlled brightness adjustment, reducing power consumption and preventing eye fatigue while maintaining desirable contrast, by dynamically altering the emission durations of pixels in response to image data and user input modes.
Implementation Method 1
OLEDs include anode electrodes, cathode electrodes, and an organic emission layer positioned between the anode electrodes and the cathode electrodes to emit light by the combination of electrons and holes
Data Source
AI summary
An organic light emitting display capable of controlling brightness responsive to a user request. The display includes a brightness controller for controlling the brightness of a display region. The brightness controller includes a first look up table for storing widths of emission control signals corresponding to the image data of one frame period and a second look up table for storing at least one outside input mode for changing the widths of the emission control signals responsive to the outside input modes. By forming virtual look up tables, it is possible to vary the outside input modes in response to a user request in order to change the brightness of the display region while saving memory. Controlling the brightness of the display region also allows reducing power consumption, preventing the eyes of a user from getting tired, and maintaining image contrast of the display region.