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Circuit, method and system for negative pixel compensation

A technology of negative pixels and circuits, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as error and distortion of touch output values ​​indicating touch events

Active Publication Date: 2011-01-19
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When an object touching the touch sensor panel is poorly grounded, the touch output value indicating a touch event may be erroneous or distorted
The likelihood of such erroneous or distorted values ​​can be further increased when two or more simultaneous touch events occur on the touch sensor panel

Method used

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  • Circuit, method and system for negative pixel compensation
  • Circuit, method and system for negative pixel compensation
  • Circuit, method and system for negative pixel compensation

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Embodiment Construction

[0018] In the following description of various embodiments, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which the disclosure may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the various embodiments.

[0019] This involves compensating for negative pixel effects in touch sensitive devices due to poor grounding of the user or other objects touching the device. The device may be configured to simultaneously measure the ground condition of the touching object and the object's touch on the device. Additionally or alternatively, the device may be configured to sequentially measure the grounding condition of the touching object and the object's touch on the device. The device may calculate a compensation factor based on the ratio between the ground measurement and the touch measurement,...

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PUM

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Abstract

Negative pixel compensation in a touch sensitive device is disclosed. The device can compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the device. To do so, the device can switch to a configuration to measure the grounding condition of the touching object and use the measurement to compensate the touch output values from the device accordingly. In the switched configuration, a first set of lines of the device can be switched between a coupling to a stimulation signal input to drive the device, a coupling to a capacitance signal output to output a signal indicative of the object's grounding condition, and a coupling to ground. A second set of lines of the device can be coupled to a touch signal output to output a signal indicative ofthe object's touch at the device. Alternatively, in the switched configuration, the first set of lines of the device can be switched to the second set of lines, and vice versa. The grounding signal is applied to the touching signal for compensating the negative pixel effect.

Description

technical field [0001] The present invention relates generally to touch sensitive devices and, more particularly, to compensating for negative pixel effects on touch sensitive devices. Background technique [0002] There are currently many types of input devices available for performing operations in computing systems, such as buttons or keys, mice, trackballs, joysticks, touch sensor panels, touch screens, and the like. In particular, touch-sensitive devices such as touch screens are becoming more and more popular due to their ease of operation and versatility, as well as decreasing prices. The touch sensitive device may comprise a touch sensor panel which may be a transparent panel with a touch sensitive surface and a display device which may be located partially or completely behind the panel such that the touch sensitive surface may cover at least a portion of the viewable area of ​​the display device, The display device is such as a liquid crystal display (LCD). Touch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041
CPCG06F2203/04104G06F3/044G06F3/0418G06F3/0416G06F3/0446G06F3/04166G06F3/0412G02F1/13338
Inventor B·R·兰德M·尤斯弗波S·P·霍泰玲
Owner APPLE INC