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Method for operating a bi-directional display

A display, two-way technology, applied in the field of APS control, can solve the problems of brightness loss, the sensitivity of the detection element cannot be increased arbitrarily, and the space of the detection element is limited.

Active Publication Date: 2017-05-24
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the inactivity of the light-generating picture element during the exposure time of the light-detecting element, which requires a certain length for good signal quality, can cause perceptible image disturbances, but at least a visible loss of brightness.
Again, the sensitivity of the detection element cannot be increased arbitrarily, since in display applications higher resolutions are always required, the chip area used for cost reasons being kept as small as possible, so that the space for the detection element is therefore severely limited or circuit measures to increase its sensitivity

Method used

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  • Method for operating a bi-directional display

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Embodiment Construction

[0017] A bidirectional display to which the method according to the invention can be applied is described, for example, in WO 2012 / 163312 A1.

[0018] Such a bidirectional display comprises not only a plurality of light-generating picture elements but also a plurality of light-detecting elements, which are usually arranged alternately with each other in an array with a plurality of rows and columns .

[0019] The structure of the element that detects light is in the figure 1 shown schematically in , and in figure 2 shown in the circuit diagram as an overview. This light-detecting element includes at least the following devices: a photodetector PD, a reset switch T1 , a changeover switch T2 , a memory T3 and a selection switch T4 , which are electrically interconnected to each other via nodes n0 , n1 , n2 and n3 . Alternatively, it is also possible to interconnect the capacitor element C1 with the node n1.

[0020] exist image 3 A phase sequence in which the light-detect...

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Abstract

The invention relates to a method for operating a bi-directional display, comprising a substrate, on which a display array comprising a plurality of light-generating image elements and a sensor array comprising a plurality of light-detecting elements are formed, wherein at least one light-generating image element is associated with each light-detecting element and wherein each light-detecting element has at least one photo-detector (PD), a reset switch (T1), a transfer switch (T2), a memory (T3) and a selection switch (T4). The illumination phase of a light-detecting element is subdivided between two consecutive reading phases of the light-detecting element into at least two illumination partial phases which are temporally spaced apart from each other and activates the at least one light-generating image element associated with the light-detecting element at least temporarily between the two illumination partial phases.

Description

technical field [0001] The invention relates to a method for operating a bidirectional display on which both an array of light-generating picture elements and an array of light-detecting elements are arranged. The light-detecting element of the bidirectional device is also called an active pixel sensor (APS for short) or a pixel unit. In particular, the invention relates to a method for controlling an APS. Background technique [0002] Image sensing devices based on CMOS technology are a popular variant of image sensors other than CCDs (Charge Coupled Devices). Sensors based on CMOS technology have the following advantage over CCDs: Electronic circuits can be co-integrated on a single chip extremely simply, thereby enabling complex system-on-chip solutions. [0003] DE 10 2006 030 541 A1 describes a device in which an element emitting electromagnetic radiation and an element detecting electromagnetic radiation are located together on one chip. In this case, both component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20
CPCG09G3/20G09G2310/08G09G2354/00G09G2360/14G09G3/22G09G2360/147
Inventor B.里希特P.瓦滕贝格
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV