Color Calibration for a Surrounding True-Color LED Display System by PWM Controls

Liu, Shih-Mim; Chou, Yan-Chi

doi:10.1109/tie.2014.2308153

Cited by 11 publications

(5 citation statements)

References 24 publications

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“…In the literature, one can find a lot of information on investigations concerning the considered class of diodes emitting white light used in the lighting technique [4][5][6]. Additionally, some papers refer to diodes emitting monochromatic light [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Thermal, Photometric and Radiometric Properties of Multi-Color LEDs Situated on the Common PCB

Górecki

Ptak

2020

Electronics

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This paper presents the results of experimental investigations illustrating the influence of the spectra of the light emitted by power LEDs on their thermal, photometric and radiometric parameters. The investigations were performed for six diodes emitting white or monochromatic light of different spectra. Each of these diodes was produced by the same manufacturer, mounted in the same package and the tested devices were soldered to the common PCB. In the paper, the manner and set-ups making possible measurements of self and transfer transient thermal impedances, illuminance and the surface power density of the light emitted by the tested devices are described. Selected results of measurements are shown and discussed. These results prove that the spectra of the emitted light influence self-transient thermal impedances of the considered devices and transfer transient thermal impedances between some pairs of these devices. Additionally, it is proved that thermal couplings between the tested diodes strongly influence their junction temperature and the surface power density of the emitted radiation.

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Section: Introductionmentioning

confidence: 99%

Thermal, Photometric and Radiometric Properties of Multi-Color LEDs Situated on the Common PCB

Górecki

Ptak

2020

Electronics

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“…Fig. 14 gives a comparison of the experimentally measured tristimulus value (XR,YR,ZR) with including thermal energy affecting from blue and green LEDs and that calculated using equation (5). The maximum discrepancy between the two is around 9.2% and the minimum discrepancy is around 0.24%.…”

Section: B Empirical Tristimulus Model Of Individual Led Inside Rgb Lmentioning

confidence: 98%

“…RGB LED color tuning can be achieved by PWM modulation of the current in each type of LED [5]. Linear power supplies or switched-mode power supplies can be used to drive the LEDs.…”

Section: Introductionmentioning

confidence: 99%

Precise Color Control of Red-Green-Blue Light-Emitting Diode Systems

Chen

Tan

Lee

et al. 2017

IEEE Trans. Power Electron.

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The complex nature and differences of the luminous and thermal characteristics of red, green and blue (RGB) light-emitting diodes (LEDs) make precise color control of RGB LED systems a great technological challenge. This paper presents a nonlinear model that includes coupling effects among LED devices for predicting color in RGB LED systems. A control method is included to demonstrate that this model can be used for precise color control. The proposed model and control method have been successfully evaluated in practical tests. The measurements agree well with model predictions. They form a new design tool for precise color control of RGB LED systems. Index Terms-Lighting system, photo-electro-thermal (PET), Red-Green-Blue (RGB) light-emitting diodes (LED) system, Color control.I.

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“…PWM signals control Micro-LED to perform the operations of on/off in different time periods, and adjust the length of the lighting time to generate different levels of grayscale [6]. Its advantages are high accuracy and high flexibility, and relatively low requirements for circuit characteristic [7]. However, the disadvantages of traditional PWM digital pulse width modulation strategy are: the brightness of the display is low at low grayscale, and the existing time redundancy causes the reduction of data transmission efficiency [8].…”

Section: Introductionmentioning

confidence: 99%

High frame rate scanning strategy of micro-LED silicon-based micro-display

Guo

Yang

2023

International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2023)

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High frame rate and high grayscale are the main direction of development of the silicon-based micro-display. Therefore, based on the research of image dithering algorithm and multi-frame fusion scanning strategy, a high frame rate scanning strategy is proposed. Under the conditions of frame rate of 200Hz, data transmission bit width of 8 bits, grayscale of 256, and resolution of 1024×768, this strategy can make data transmission efficiency reach 100% and data transmission frequency reach 52.429MHz, which can support high frame rate display with limited bandwidth. Then use diffierent scanning strategies to process images. By the analysis of images, grayscale distribution histogram and grayscale test images, it shows that after the procession of diffierent scanning strategies, the grayscale linearity of images is good, the phenomenon of image distortion is not obvious. It proves that the strategy can meet the needs of silicon-based micro-display.

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Color Calibration for a Surrounding True-Color LED Display System by PWM Controls

Cited by 11 publications

References 24 publications

Thermal, Photometric and Radiometric Properties of Multi-Color LEDs Situated on the Common PCB

Thermal, Photometric and Radiometric Properties of Multi-Color LEDs Situated on the Common PCB

Precise Color Control of Red-Green-Blue Light-Emitting Diode Systems

High frame rate scanning strategy of micro-LED silicon-based micro-display

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