OLED Panel Driver Current Control Without Serial Resistor
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Solution Overview
Problem
Current OLED display devices require a serial resistor to sense panel current, leading to increased cost and power consumption due to the need for a resistor with a very large resistance value.
Innovation Solution
An OLED display device and method that control panel current without a serial resistor by using a panel driver with a determining circuit to select pixel rows, a sensing circuit to generate mobility sensing data, and a current control circuit to adjust the panel current based on comparisons between mobility sensing data and target mobility data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a serial resistor is used to sense panel current, then current sensing is achieved, but cost and power consumption increase substantially
Solution Approach 1:
The patent extracts the current sensing function from the traditional serial resistor approach and relocates it to the panel driver circuit. The panel driver directly measures the panel current without requiring an external sensing resistor, thereby eliminating the need for high-value resistors and reducing power consumption while maintaining sensing accuracy
Solution Approach 2:
The panel driver is designed to perform multiple functions: driving the display panel, sensing the panel current, and controlling the current within maximum limits. By integrating current sensing and control capabilities into the panel driver, the system eliminates the need for separate sensing components and reduces overall power consumption
2Measurement precision
If a serial resistor is used to sense panel current, then current sensing is achieved, but cost increases substantially
Solution Approach 1:
The patent removes the external serial resistor component from the system and integrates its sensing function into the panel driver circuit. This eliminates the need to source and install high-value resistors, reducing component costs and simplifying the manufacturing process
Solution Approach 2:
The patent combines the current sensing function with the panel driver circuit, merging two previously separate functions (driving and sensing) into a single integrated component. This reduces the total component count and assembly complexity, thereby lowering manufacturing costs
3Use of energy by stationary object
If panel current is controlled without a serial resistor, then cost and power consumption are reduced, but current sensing capability must be maintained
Solution Approach 1:
The patent implements a feedback mechanism where the panel driver continuously monitors the panel current and compares it against maximum current limits. Based on this feedback, the driver dynamically adjusts the driving signals to maintain current within safe operating limits, ensuring both power efficiency and accurate current control
Data Source
AI summary
An organic light emitting diode (OLED) display includes pixel rows, and a panel driver configured to drive the display panel. The panel driver includes a determining circuit configured to select one pixel row from the plurality of pixel rows, to determine load data based on input image data for the one pixel row, and to determine target mobility data corresponding to the load data, a sensing circuit configured to generate mobility sensing data corresponding to mobility values of driving transistors of a plurality of pixels included in the one pixel row by performing a mobility sensing operation on the one pixel row, and a current control circuit configured to compare the mobility sensing data and the target mobility data to generate a result, and to adjust a panel current flowing through the display panel according to the result.