CCFFL and its drive method

Abstract

The CCFFL comprises a luminous tube, at least a first electrode and a second electrode, a transformer whose one side is connected to the first electrode and second electrode, and a full bridge circuit connected to another side of the transformer. The new driving means includes: a voltage wave form is applied to the two electrodes, which comprises electrical level, shape, slop and frequency. The voltage wave form features: a) it has bipolarity voltage wave form; b) the electrical level applied to the electrode has multiplexing levels; c) ascending and descending slope is controllable; e) the voltage level of wave form is variable; e) the frequency of the voltage wave form is variable and is disturbance; f) it can adjust the output of light.

Description

technical field [0001] The present invention relates to a cold-cathode flat fluorescent lamp and its driving method, especially a driving method for a cold-cathode flat fluorescent lamp applied to a backlight source of a liquid crystal display, but not limited to a backlight source, the cold-cathode flat fluorescent lamp light source can also be applied to Such as advertising lighting, indication and emergency lighting, etc., all belong to the application field of the present invention. Background technique [0002] In recent years, due to the increasingly mature manufacturing technology of liquid crystal displays (LCD), and the active investment in research and development and the adoption of large-scale production equipment by major manufacturers around the world, the quality of LCD displays has been continuously improved. Among them, LCD TVs are the most anticipated and eye-catching. Driven by the gradual implementation of digital TV popularization measures, LCD TVs are a...

AI Technical Summary

Problems solved by technology

[0008] (1) Since the driving method used is a single pulse voltage with fixed polarity, as the operation time increases, the positive and negative ions generated by the dissociation of gas molecules of the inert gas will adhere to and accumulate near the electrodes to form wall charges (wall charge), so that the subsequent driving voltage must be increased to obtain the same driving performance, resulting in poor luminous efficiency, and will increase the temperature of the lamp surface, which will easily lead to unstable arc operation of the lamp body

[0009] (2) Because the cold-cathode flat fluorescent lamp is driven by high voltage (the driving voltage is usually greater than 2kV), its electromagnetic interference (Electromagnetic Interference, EMI) is serious, and it is easy to cause the problem that it cannot pass the EMI / EMC test after being assembled into a backlight module in the future

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