Touch key device

Abstract

The invention relates to touch induction technical field, which comprises a keyboard shell, an EL backlight plate adhered on the keyboard shell, a touch induction key panel adhered on the back surface of the EL backlight plate, and a control circuit used for driving and controlling the EL backlight plate to operate; touch keys are arranged on the touch induction key panel; the control circuit identifies the touch keys and drives the EL backlight plate to operate. The invention adopts an EL backlight plate as the backlight source for touch keys, and the EL backlight plate has the characteristics of low power consumption and gentle light. Through holes are arranged on the EL backlight plate corresponding to the touch keys; each through hole is bigger than the corresponding touch key by 2%-10% in all directions, so the interference on the induction sensitiveness of touch keys from the EL backlight plate and air is overcome; and the induction sensitiveness of each touch key is ensured to be the same or in the same level; meanwhile, the induction interference on the touch keys from the EL backlight plate is overcome; thereby, the sensitiveness of touch keys is improved.

Description

Technical field [0001] The present invention relates to the technical field of touch sensing, in particular to a capacitive touch key device. Background technique [0002] At present, capacitive touch button technology is combined with EL (Electronic Luminescence, electroluminescent sheet) as the backlight source. Due to insufficient button sensitivity and the metal component contained in the lower electrode layer of the EL backlight, which interferes with the sensitivity of the touch button, etc. It is limited to electronic products with plastic shell thickness less than 3mm, such as mobile phones and computer keyboards with special thinner shells, and cannot be used in ordinary keyboard products with shell thickness greater than 3mm. Therefore, most of these products use LED backlights as button backlights, and LED backlights have the disadvantages of high power consumption and non-soft light emission compared to EL backlights. Summary of the invention [0003] The present inv...

AI Technical Summary

Problems solved by technology

[0002] At present, capacitive touch button technology combined with EL (Electronic Luminescence, electroluminescent sheet) sheet as the backlight product, due to the insufficient sensitivity of button sensing and the interference of the metal components contained in the electrode layer under the EL backlight on the sensitivity of the touch button, etc., It is limited to electronic products with a plastic shell thickness less than 3mm, such as mobile phones and computer keyboards with specially thinned shells, and cannot be used in ordinary keyboard products with a shell thickness greater than 3mm.

Therefore, most of these products use LED backlights as key backlights. Compared with EL backlights, LED backlights have disadvantages such as high power consumption and soft light emission.

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