Backlight structure of touch key

Abstract

The invention discloses a backlight structure of a touch key, which makes the touch key on a panel produce backlight allowing a user to operate conveniently under a dark condition. The structure comprises the panel, a key plate and a backlight plate, wherein the panel is arranged on the outermost side of the backlight structure and bears the touch key; the key plate is taken as a circuit board which realizes the operation function of the touch key; a printed circuit is formed on the surface of the circuit board; the key plate is arranged close to the panel; a luminous backlight source is formed on the backlight plate; the key plate is arranged between the panel and the backlight plate; a semitransparent part is formed at a position, which corresponds to the touch key on the panel, on the key plate; and light rays produced by the backlight source are uniformed by the semitransparent part while passing through the semitransparent part and irradiate on the back side of the touch key. After light rays are uniformed by the circuit board, the 'flashlight' effect of a point light source is improved, so that a uniform surface light source can be realized easily by a small number of light-emitting diodes and the backlight of each key can be controlled separately.

Description

technical field [0001] The invention belongs to the technical field of touch keys, and in particular relates to a backlight structure of a touch key in which a key plate is arranged between a panel and a backlight plate, and light passing through the key plate is homogenized through a light-transmitting portion on the key plate. technical background [0002] With the development of electronic technology, the design direction of various electronic products is developing in the direction of thinness and ease of use, striving to integrate more functions in as small a volume as possible, and at the same time control production costs while improving product appearance. Traditional mechanical keys are gradually replaced by more compact touch keys or touch screens due to their high cost and large size, and touch keys are increasingly used in electronic products due to their low cost. [0003] The structure of the touch key includes: a panel that is arranged on the outermost side of...

AI Technical Summary

Problems solved by technology

[0008] like figure 2 As shown, the surface light source D is used on the other side of the keypad 2 to directly punch holes on the touch-sensitive keypad 2, and this method has high requirements for the backlight source, which requires a uniform backlight source. Adding a dodging plate for a uniform backlight will not only increase the cost, but also complicate the process

And there is also the disadvantage that the color of the backlight cannot be flexibly controlled

If a point light source is directly used on the backlight panel 4, and a through hole is provided on the keypad so that the light is projected from the through hole to the touch key a on the panel 1, then the backlight is likely to be uneven, resulting in a "flashlight" effect.

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