Four-Color OLED Panel Driver White Sub-Pixel Deterioration Compensation
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Solution Overview
Problem
Four-color organic light emitting display devices with white sub-pixels suffer from premature deterioration of the white organic light emitting element, leading to reduced luminance and shifted color coordinates, causing yellowish images and 'image sticking' due to non-uniform material characteristics and emission times.
Innovation Solution
An organic light emitting display device with a four-color data converter and panel driver that accumulates sub-pixel data, performs color correction based on white sub-pixel deterioration, and selectively drives red, green, and blue sub-pixels to maintain color accuracy and prevent image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white sub-pixel continuously emits light to increase luminance, then the luminance of the unit pixel is improved, but the white organic light emitting element deteriorates prematurely causing color coordinate shifts and image sticking
Solution Approach 1:
The patent implements a driving method where the white sub-pixel is driven in a periodic manner rather than continuously. By controlling the white sub-pixel to emit light periodically with specific duty cycles and accumulation periods, the luminance output is maintained while reducing continuous stress on the organic light emitting element, thereby preventing premature deterioration and color coordinate shifts.
2Stability of the object's composition
If color correction is performed continuously to maintain color accuracy, then color coordinate stability is improved, but the device complexity increases due to additional data processing requirements
Solution Approach 1:
The patent performs color correction in advance during the accumulation period before the actual display period. By calculating and storing the white sub-pixel data and determining appropriate correction values during the accumulation phase, the system maintains color coordinate stability without requiring complex real-time processing during display, thus reducing overall device complexity.
Solution Approach 2:
The system uses the accumulated white sub-pixel data itself to perform self-correction. By comparing the accumulated white sub-pixel data with reference values and automatically adjusting the driving signals based on detected deviations, the system maintains color accuracy using its own operational data without requiring external calibration equipment or complex additional processing circuits.
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
The solution effectively prevents changes in color coordinates and image sticking by compensating for white sub-pixel deterioration, ensuring stable and accurate color representation.
Implementation Method 1
a plurality of unit pixels having red, green, blue, and white sub-pixels including different organic light emitting elements
Data Source
AI summary
Disclosed is an organic light emitting display device. The organic light emitting display device includes a display panel arranged to include a plurality of unit pixels having red, green, blue, and white sub-pixels, a four-color data converter configured to convert input data of red, green, and blue of each unit pixel into data of red, green, blue, and white respectively corresponding to the red, green, blue, and white sub-pixels, and a panel driver configured to accumulate data of each of the sub-pixels at every accumulation period, store the accumulated data in a memory, decide a color correction mode for correcting a color of each unit pixel on the basis of the accumulated data of the white sub-pixel stored in the memory, drive the white sub-pixel of each unit pixel according to the decided color correction mode, and selectively drive the red, green, and blue sub-pixels.