Method for judging capacitance type touch buttons
First Claim
1. A method for detecting capacitive touch keys, comprising:
- when a touch key is being touched, determining change trends of charge amounts in each charge accumulation region corresponding to a touch key, where the change trends comprise increment and decrement;
performing charge adjustment to each charge accumulation region corresponding to a touch key until charge amounts in each charge accumulation region corresponding to a touch key reach stability based on the determined change trends, where if the change trend is decrement, charge adjustment is performed to the charge accumulation region until the charge amount in the charge accumulation region reaches a charge balance amount, and if the change trend is increment, charge adjustment is performed to the charge accumulation region until the charge amount in the charge accumulation region reaches a maximum value, where the charge balance amount is the charge amount in the charge accumulation region before the capacitive touch key is touched;
calculating charge change amounts in each charge accumulation region when the touch key is being touched according to charge adjustment amounts in each charge accumulation region corresponding to a touch key, and calculating the ratio of the charge change amount to the charge balance amount in each charge accumulation region;
when the change trend of charge amount in the charge accumulation region corresponding to the touch key is decrement, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the touch key is greater than a first threshold and less than a third threshold, or is equal to the first threshold and less than the third threshold, determining the touch key is touched; and
when the change trend of charge amount in the charge accumulation region corresponding to the touch key is increment, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the touch key is greater than a second threshold and less than the third threshold, or is equal to the second threshold and less than the third threshold, determining the touch key is touchedwhere an insulating dielectric layer is formed on the periphery of each touch key, a metal layer is formed on the periphery of the insulating dielectric layer, metal shield rings are formed between adjacent touch keys, and each touch key is connected with a standard unit capacitor.
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Abstract
A method for judging capacitance type touch buttons in touch sensing technical field includes that: when touching a button, determining the change trend of the charge quantity on the button; a charge regulation is performed to the charge accumulation area corresponding to each button, until the charge quantity in the charge accumulation area corresponding to the button remains unchanged; calculating the charge changing quantity of the charge accumulation area when touching the button, and calculating the ratio between the charge changing quantity of the charge accumulation area and the charge balance quantity as well; and when the change trend of the charge quantity on the button is decrease and the ratio between the charge changing quantity of the charge accumulation area corresponding to the button and the charge balance quantity is larger than or equal to the first threshold value and smaller than the third threshold value, or when the change trend of the charge quantity on the button is increase and the ratio between the charge changing quantity of the charge accumulation area corresponding to the button and the charge balance quantity is larger than or equal to the second threshold value and smaller than the third threshold value, the button is the touched button. The capacitance type touch buttons are judged more accurately according to the present invention.
10 Citations
19 Claims
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1. A method for detecting capacitive touch keys, comprising:
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when a touch key is being touched, determining change trends of charge amounts in each charge accumulation region corresponding to a touch key, where the change trends comprise increment and decrement; performing charge adjustment to each charge accumulation region corresponding to a touch key until charge amounts in each charge accumulation region corresponding to a touch key reach stability based on the determined change trends, where if the change trend is decrement, charge adjustment is performed to the charge accumulation region until the charge amount in the charge accumulation region reaches a charge balance amount, and if the change trend is increment, charge adjustment is performed to the charge accumulation region until the charge amount in the charge accumulation region reaches a maximum value, where the charge balance amount is the charge amount in the charge accumulation region before the capacitive touch key is touched; calculating charge change amounts in each charge accumulation region when the touch key is being touched according to charge adjustment amounts in each charge accumulation region corresponding to a touch key, and calculating the ratio of the charge change amount to the charge balance amount in each charge accumulation region; when the change trend of charge amount in the charge accumulation region corresponding to the touch key is decrement, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the touch key is greater than a first threshold and less than a third threshold, or is equal to the first threshold and less than the third threshold, determining the touch key is touched; and when the change trend of charge amount in the charge accumulation region corresponding to the touch key is increment, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the touch key is greater than a second threshold and less than the third threshold, or is equal to the second threshold and less than the third threshold, determining the touch key is touched where an insulating dielectric layer is formed on the periphery of each touch key, a metal layer is formed on the periphery of the insulating dielectric layer, metal shield rings are formed between adjacent touch keys, and each touch key is connected with a standard unit capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification