Automatic compensation method based on temperature characteristics of RGB LEDs
US12273973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2023 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | Nov 29, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/325
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic compensation method based on temperature characteristics of RGB LEDs by first obtaining current temperatures of the RGB LEDs, and then adjusting a corresponding PWM duty cycle of each LED according to the current temperature of each LED to change drive currents of the RGB LEDs, thereby achieving compensation for the RGB LEDs. By determining a temperature adjustment coefficient of each LED based on the current temperature, temperature adjustment ratios, and an adjustment step size of the LED, and finally adjusting the PWM value according to the temperature adjustment coefficient to drive the LED, color shift is reduced. When performing PWM duty cycle adjustment, adjustment formulae are used, which only require obtaining the current temperature, the temperature adjustment ratios, and the adjustment step size of each LED, and then calculating according to the formula, therefore not requiring extensive data storage or data lookup and thus resulting in lesser computation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.