Display Device Driving Control Voltage Deviation Compensation
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Solution Overview
Problem
The manufacturing process of display devices often results in deviations between the driving power source voltage used during gamma voltage predetermination and the actual output voltage in the completed product, leading to differences in light emitting characteristics, such as luminance and color coordinates, due to changes in connection resistance and supply environments.
Innovation Solution
A driving control device and method that compensates for these deviations by obtaining the actual output voltage value of the driving voltage and using it to generate a reference gamma voltage, which is then used to form a gray voltage corresponding to the data signal, thereby minimizing image quality non-uniformity and luminance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma voltage predetermination is performed during manufacturing, then luminance compensation can be achieved, but deviation occurs between manufacturing driving voltage and actual output voltage due to DC-DC converter changes and connection resistance differences
Solution Approach 1:
The patent measures and stores the actual driving power source voltage output values during manufacturing before the display device is completed. This preliminary measurement allows the system to compensate for voltage deviations later by comparing stored manufacturing voltage data with actual operating voltage, ensuring consistent luminance compensation despite voltage variations between manufacturing and usage phases.
2Measurement precision
If connection resistance changes between manufacturing and actual use, then gamma voltage predetermination becomes inaccurate, but re-measuring voltage in completed product increases manufacturing complexity
Solution Approach 1:
The patent enables the display device to automatically measure and store its own driving power source voltage output values during the manufacturing process. This self-measurement capability eliminates the need for external test equipment to repeatedly measure voltage under different connection conditions, reducing manufacturing complexity while ensuring accurate voltage data is captured for later compensation.
3Manufacturing precision
If driving power source voltage changes due to increased current in larger display panels, then light emitting characteristics become non-uniform, but compensating for each pixel individually increases device complexity
Solution Approach 1:
The patent implements a universal compensation approach where a single measured driving power source voltage value is used to compensate for luminance characteristics across all pixels in the display panel. Instead of measuring or compensating each pixel individually, the system uses the overall voltage measurement to adjust gamma voltages for the entire panel, maintaining luminance uniformity while avoiding the complexity of pixel-level compensation circuits.
Data Source
AI summary
A display device, a driving control device of the display device, and a driving control method are disclosed. In one aspect, the display device comprises a display unit consisting of a plurality of pixels including a light emitting element emitting light according to a driving current corresponding to a data signal; a scan driver transmitting a scan signal through a plurality of scan lines; a data driver transmitting a data signal through a plurality of data lines; a power supply unit supplying a driving voltage to drive a plurality of pixels through a power source wire; and a driving controller connected to the power source wire, obtaining an actual output voltage value of the driving voltage output from the power source voltage supply unit, and compensating a deviation of the driving voltage in a process step by using the actual output voltage value.