Cold cathode fluorescent lamp electrode inner coating method

Abstract

The invention provides a cold cathode fluorescent lamp electrode inner coating method. Cesium sulfate dark potion passes through a dropper and a needle head to enter a cold cathode fluorescent lamp electrode cup through high-pressure blowing. Liquid level height of the dark potion in the electrode cup is controlled to be 2 / 3 to 4 / 5 of height of the electrode cup. When the dark potion arrives at a set liquid level, the surplus dark potion is absorbed away, the electrode cup is dried and coated at the temperature of 250 DEG C, and electrode inner coating is finished. In a whole technological process, a cesium sulfate solution is in the closed environment so as to avoid influence on the dark potion due to volatilization of H2O, potion purity degree is guaranteed, the cesium sulfate solution can be fully coated on the inner surface of the electrode cup, and low work function of electrode emitting materials is guaranteed. The surplus potion in the electrode cup is absorbed, consumption of the dark potion is reduced, and electrode sealing quality is improved. Dark potion flow amount in the dropper can be controlled accurately through the high-pressure blowing, and accuracy and stability of supply of the dark potion are guaranteed.

Description

technical field [0001] The invention relates to a film-coating method for electrodes of a cold cathode fluorescent lamp (CCFL). Background technique [0002] Usually, the cold cathode fluorescent lamp is installed inside the liquid crystal display, and the surrounding of the lamp is a dark place. The number of ionized electrons in the lamp, that is, the number of initial electrons decreases, which increases the start-up time. In addition, the cold cathode potential drop of the cold cathode fluorescent lamp is higher than the cathode potential drop of the hot cathode fluorescent lamp. The traditional cold cathode fluorescent lamp (CCFL) electrode coating is loaded with the electrode cup 22 through the 8-station loading tray 11. figure 1 In the vertical direction shown, the cylinder pushes the liquid medicine container 44 to move upwards, and the electrode cup is soaked with the dark liquid liquid for coating and dried at 450°C. This method has the following disadvantages: ...

AI Technical Summary

Problems solved by technology

[0003] (1) The inner coating film of the electrode cup is insufficient, and the liquid medicine sticks on the outside of the electrode cup, which is not used and is wasted

The dark potion is attached to the inside of the electrode cup to form particles, and there may be residual solution after drying at 450°C, which will cause waste of dark potion and affect the quality of the lamp tube fusion seal

[0004] (2) The liquid medicine container is an open metal tank, H 2 O volatilization has an impact on the concentration of the dark potion, and it is difficult to guarantee its purity

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