Sensing devices and electronic apparatuses using the same
AssigneeChimei Innolux Corporation
InventorFu-Yuan Hsueh
Life of this patent
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Abstract
A sensing device is provided to sense light and generates a sensing output signal indicating intensity of the light. The sensing device includes a photo element, a comparison circuit, and a logic circuit. The photo element senses the light and generates a current signal at a first node. The comparison circuit is coupled to the first node and receives the current signal. The comparison circuit includes a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal. The logic circuit receives the result signal and performs a logic operation to the result signal to generate the sensing output signal.
Claims18
A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprising
- a photo element for sensing the light and generating a current signal at a first node;
- a comparison circuit, coupled to the first node, for receiving the current signal, wherein the comparison circuit comprises a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal;
- a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal;
- a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted;
- and
- a feedback capacitor coupled between the logic circuit and the first node, wherein the reset capacitor and the feedback capacitor have large capacitances.
A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprising
- a photo element for sensing the light and generating a current signal at a first node;
- a comparison circuit, coupled to the first node, for receiving the current signal and generating a result signal according to the current signal, wherein the comparison circuit has a low gain;
- a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal;
- a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted;
- and
- a feedback capacitor coupled between the logic circuit and the first node.
Dependencies are inferred from the claim text.