TOUCH DETECTION DEVICE AND DISPLAY DEVICE HAVING TOUCH DETECTION FUNCTION
First Claim
Patent Images
1. A touch detection device comprising:
- a plurality of drive electrodes;
a plurality of detection electrodes provided to generate capacitances with the drive electrodes;
a display driver configured to perform a touch scanning drive by supplying a touch drive signal having pulses for detecting proximity of an external object to a target drive electrode, which is selected from the drive electrodes; and
a touch driver configured to transmit and receive a signal to and from the display driver, output a drive synchronizing signal for producing the touch drive signal to the display driver, and acquire detection signals from the detection electrodes at timing corresponding to inputting of the touch drive signal, to detect the proximity of the external object,wherein at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal is determined based on the signal received from the display driver.
1 Assignment
0 Petitions
Accused Products
Abstract
According to one embodiment, a touch detection device includes a plurality of drive electrodes, a plurality of detection electrodes, a display driver which performs a touch scanning drive by supplying a touch drive signal to a target drive electrode to be driven, and a touch driver which transmits and receives a signal to and from the display driver, wherein at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal is determined based on the signal received from the display driver.
-
Citations
15 Claims
-
1. A touch detection device comprising:
-
a plurality of drive electrodes; a plurality of detection electrodes provided to generate capacitances with the drive electrodes; a display driver configured to perform a touch scanning drive by supplying a touch drive signal having pulses for detecting proximity of an external object to a target drive electrode, which is selected from the drive electrodes; and a touch driver configured to transmit and receive a signal to and from the display driver, output a drive synchronizing signal for producing the touch drive signal to the display driver, and acquire detection signals from the detection electrodes at timing corresponding to inputting of the touch drive signal, to detect the proximity of the external object, wherein at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal is determined based on the signal received from the display driver. - View Dependent Claims (2, 3)
-
-
4. A display device having a touch detection function, comprising:
-
a plurality of drive electrodes; a plurality of detection electrodes provided to generate capacitances with the drive electrodes; a display driver configured to perform a touch scanning drive by supplying a touch drive signal having pulses for detecting proximity of an external object to a target drive electrode, which is selected from the drive electrodes; a touch driver configured to transmit and receive a signal to and from the display driver, output a drive synchronizing signal for producing the touch drive signal to the display driver, and acquire detection signals from the detection electrodes at timing corresponding to inputting of the touch drive signal, to detect the proximity of the external object; and display pixels configured to perform display based on display signals and a display drive signal, wherein at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal is determined based on the signal received from the display driver, and the display driver repeatedly alternately performs a display scanning drive and the touch scanning drive in a time sharing manner, and in the display scanning drive, the display diver supplies the display drive signal to the drive electrodes in turn. - View Dependent Claims (5, 6, 7)
-
-
8. A display device having touch detection function, comprising:
-
a plurality of drive electrodes; a plurality of detection electrodes provided to generate capacitances with the drive electrodes; a display driver configured to perform a touch scanning drive by supplying a touch drive signal having pulses for detecting proximity of an external object to a target drive electrode, which is selected from the drive electrodes; a touch driver configured to transmit and receive a signal to and from the display driver, output a drive synchronizing signal for producing the touch drive signal to the display driver, and acquire detection signals from the detection electrodes at timing corresponding to inputting of the touch drive signal, to detect the proximity of the external object, display pixels configured to perform display based on display signals and a display drive signal, wherein the touch driver determines at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal based on the signal received from the display driver, and the display driver repeatedly alternately performs a display scanning drive and the touch scanning drive in a time sharing manner, and in the display scanning drive, the display diver supplies the display drive signal to the drive electrodes in turn. - View Dependent Claims (9, 10, 11)
-
-
12. A display device having touch detection function, comprising
a plurality of drive electrodes; -
a plurality of detection electrodes provided to generate capacitances with the drive electrodes; a display driver configured to perform a touch scanning drive by supplying a touch drive signal having pulses for detecting proximity of an external object to a target drive electrode to be driven, which is selected from the drive electrodes; a touch driver configured to transmit and receive a signal to and from the display driver, output a drive synchronizing signal for producing the touch drive signal to the display driver, and acquire detection signals from the detection electrodes at timing corresponding to inputting of the touch drive signal, to detect the proximity of the external object; and display pixels configured to perform display based on display signals and a display drive signal, wherein the touch driver determines at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal based on the signal received from the display driver, the touch driver measures first time based on the signal received from the display driver, makes a calculation using the first time and a constant to determine a longest time during which the drive synchronizing signal is allowed to be output, and also determines a maximum number of pulses which are supplied in the longest time, as the number of pulses of the drive synchronizing signal, the display driver repeatedly alternately performs a display scanning drive and the touch scanning drive in a time sharing manner, and in the display scanning drive, the display diver supplies the display drive signal to the drive electrodes in turn. - View Dependent Claims (13, 14, 15)
-
Specification