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Touch sensitive active matrix display and method for touch sensing

A display device, sensitive technology, used in static indicators, instruments, optics, etc., to solve problems such as interruptions

Inactive Publication Date: 2006-01-25
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This inevitably interrupts normal display operation

Method used

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  • Touch sensitive active matrix display and method for touch sensing
  • Touch sensitive active matrix display and method for touch sensing
  • Touch sensitive active matrix display and method for touch sensing

Examples

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Embodiment Construction

[0035] The present invention provides a display and a driving method that allow physical pressure sensing by a finger or stylus on the front of an LC display without adding additional components to the display substrate. This is achieved by using components already present in the display to enable sensing, and connecting them with additional electronic circuitry. Furthermore, image distortion is avoided or kept to a minimum, achieving simultaneous display and sensing.

[0036] The system works by detecting changes in capacitance in the LC pixels of the display produced by pressure on the front glass (or plastic). image 3 A schematic cross section of an active matrix liquid crystal display (AMLCD) is shown. The pixel capacitance is determined by the capacitance between the pixel electrode 40 and the common electrode 18 and is proportional to the inverse of the cell gap 42 . If pressure is applied, the substrate forming the LC cell deforms as the spacer balls 44 deform, there...

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Abstract

A touch sensitive active martix display device has an array of capacitive display element pixels (16), each associated with a pixel storage capacitor (20) and a pixel transistor. One or more common electrode contacts (18a) are provided and connected to a terminal of a plurality of the display elements (16). Each common electrode contact is individually connectable to a charge measurement device (50) for measuring a flow of charge to the common electrode contact. The charge flowing through the capacitive display element can thus be measured while the pixel transistor is switched off. This flow of charge represents the transfer of charge between the pixel storage capacitor (20) and the display element (16) and results from a change in capacitance, and is therefore indicative of a touch input.

Description

technical field [0001] The present invention relates to active matrix liquid crystal displays, especially such displays with touch sensitive input. Background technique [0002] Active matrix displays typically include an array of pixels arranged in rows and columns. Each row of pixels shares a row conductor connected to the gates of the thin film transistors in that row. Each column of pixels shares a column conductor that provides a pixel drive signal. A signal on the row conductor determines whether the transistor is on or off, and when the transistor is turned on by a high voltage pulse on the row conductor, the signal from the column conductor is passed to an area of ​​liquid crystal material (or other capacitive display element) by This changes the light transmission properties of the material. [0003] figure 1 A conventional pixel structure of an active matrix liquid crystal display is shown. The display is arranged as an array of pixels in rows and columns. Ea...

Claims

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Application Information

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IPC IPC(8): G02F1/133G06F3/033G06F3/041G06F3/044
CPCG06F3/0412G06F3/044G02F1/13338G06F3/0446G06F3/0445G06F3/0447G06F3/04166
Inventor A·G·克纳普M·T·约翰逊
Owner KONINKLIJKE PHILIPS ELECTRONICS NV