Touch sensor and method for driving the same and display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorMunehiro Kozuma
Life of this patent
Estimating the term…
Abstract
It is an object to suppress malfunction of a touch sensor, a touch panel, and a device using them by accurate determination whether inputting is performed or not. In addition, it is also an object to enhance the response speed of the determination. A touch panel including a plurality of pixels having photosensors and an image processing portion are included. The photosensor forms a contact image of a portion of an object which touches the touch panel. The image processing portion calculates the area of the contact portion from color data of the contact image and determines on the basis of the area whether inputting to the touch panel is performed or not.
Claims8
A display device comprising:
- a touch panel comprising a pixel circuit, the pixel circuit comprising a pixel;
- and
- an image processing portion including an input process portion and a response process portion, wherein the pixel comprises a photosensor and a display element,
- wherein the photosensor is configured to form a contact image of a portion where the touch panel is touched by a finger, wherein the input process portion is configured to calculate an area of a contact portion from color data of the contact image,
- wherein the input process portion comprises a circuit for calculating an input pressure from the area which is calculated from the color data of the contact image,
- wherein the response process portion is configured to detect an input to the touch panel based on the area, and
- wherein a plurality of threshold values are set for an area and an input to the touch panel is detected in multi-level depending on the result of the comparison between the area and the threshold values.
A display device comprising:
- a touch panel comprising a pixel circuit, the pixel circuit comprising a pixel;
- and
- an image processing portion including an input process portion and a response process portion,
- wherein the pixel comprises a photosensor and a display element comprising a light emitting element,
- wherein the photosensor is configured to form a contact image of a portion where the touch panel is touched by a finger,
- wherein the input process portion is configured to calculate an area of a contact portion by subjecting color data of the contact image to a converting process from RGB value to HSV value, a binarizing process, a noise removing process, and a labeling process,
- wherein the input process portion comprises a circuit for calculating an input pressure from the area which is calculated from the color data of the contact image,
- wherein the response process portion is configured to detect an input to the touch panel based on the area, and
- wherein a plurality of threshold values are set for an area and an input to the touch panel is detected in multi-level depending on the result of the comparison between the area and the threshold values.
Dependencies are inferred from the claim text.