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`A casing part (18) is adapted to enclose the components related to the
`
`5
`
`control system (10).
`The light source (20) is illustrated in the form of a fluorescent lamp and is
`adapted to extend across the full width of the casing.
`Light is able to pass through a number of ''windows" (24) in the panel (22)
`and is reflected through 90 degrees by a mirror surface (26).
`The light shall then pass a transparent casing-wall portion (28), and then
`
`through the sunken surface portion (14), and thereafter through an opposite wall
`
`10
`
`portion (32), so as to be reflected onto the light detector or light receiver (36) by a
`
`mirror surface (34).
`Figure 1 of this patent publication shows that when a fingertip (49) is placed
`
`within the sunken surface (14), a number of light rays are shadowed within a
`defined area (48a), enabling this area to be detected.
`
`15
`
`Figure 8 shows a system in which light sources and light detectors or light
`
`receivers are orientated in perpendicular co-ordinates.
`
`US-A-4,880,969
`This patent publication describes and illustrates a programmable touch
`screen.
`
`20
`
`Figures 3 and 4 in particular illustrate an optical keyboard (12) which includes
`an IR-adapted light source (32), a light receiver (34) and optical "prism" or mirror
`
`surfaces (36, 38).
`
`In this regard, Figure 3 shows that these mirror surfaces (36, 38) are related
`
`25
`
`to mutually opposite edge portions of a window surface (22).
`
`EP-A 1-0 330 767
`
`This publication illustrates and describes a touch screen, which is adapted to
`
`create control signals by means of which a function can be selected in response to
`
`30
`
`the movement and displacement of an operator's fingertip relative to the screen
`(1 ).
`
`More particularly, this publication is concerned with the activation of a time
`
`circuit immediately a finger or a fingertip touches the touch screen, where a
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`IPR2021-01041
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`particular movement direction and a particular distance of movement are detected
`and an electronic unit or the like is activated in response to these parameters.
`
`The touch screen or touch panel (1) is provided along its four sides with light(cid:173)
`emitting diodes (LED) (101-114) and light receiving devices in the form of
`
`phototransistors or photodiodes (201-214), as illustrated in Figure 2.
`The finger or the fingertip shadows one or more light beams orientated in a
`right-angled co-ordinate system, wherein shadowed light receiving devices and
`
`detected changes in shaded devices constitute magnitudes from which desired
`functions are evaluated and initiated.
`
`Summary of the invention
`Technical problems
`
`When taking into consideration the technical deliberations that a person
`
`skilled in this particular art must make in order to provide a solution to one or more
`technical problems that he/she encounters, it will be seen th9t it is necessary, on
`the one hand, to realise initially the measures and/or the sequence of measures
`
`that must be undertaken to this end, and on the other hand to realise which means
`is/are required to solve one or more of said problems. On this basis, it will be
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`5
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`10
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`15
`
`evident that the technical problems listed below are highly relevant to the
`development of the present invention.
`
`20
`
`When considering the earlier standpoint of techniques, as presented in the
`afore going, it will be seen that a technical problem resides in the ability to create
`
`conditions which enable a mobile telephone apparatus, or cell phone, to be
`provided with a touch screen that includes edge-related light-emitting units and
`
`25
`
`oppositely located edge-related light receiving units together with associated
`
`circuits while retaining the small external dimensions of said apparatus, so that a
`geographical surface section and a function corresponding to said surface section
`
`can be established through the medium of a calculating unit, or computing unit,
`
`when certain light pulse receiving units do not indicate the reception of expected
`light pulses.
`
`30
`
`Another technical problem resides in the ability to create construction
`
`instructions that will provide conditions for reducing the space required by such a
`
`touch screen and for adapted planning and placement of said screen within the
`
`external confines of a mobile telephone.
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`IPR2021-01041
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`A further technical problem resides in the ability to create conditions, with the
`aid of simple means, that enable energy consumption and power requirements to
`be kept low, with regard to the mobile telephone being battery powered, by
`
`5
`
`generating short light pulses and by allowing the units to be activated sequentially
`in a chosen order.
`
`In the case of this latter application, it will be seen that a technical problem
`resides in allowing the use of a number of pulse generating circuits, each
`connected to a respective light pulse emitting unit, and a number of light pulse
`receiving units, each connected to a respective pulse receiving circuit, and in the
`
`10
`
`ability to establish, via a calculating unit, the geographic position of a user's
`
`fingertip, or thumb tip, on a front surface part, positioned so as to shadow one or
`
`more parallel, related light pulses and therewith indicate the absence of light
`pulses in one or more light pulse receiving units and unit-related pulse-receiving
`
`15
`
`circuits.
`When considering the earlier standpoint of techniques as described above, it
`
`will also be seen that a technical problem resides in the provision of structural
`
`changes in a touch screen, such as to enable the screen to be significantly thinner
`
`than prior art screens, so as to adapt said screen directly onto a mobile telephone.
`A further technical problem resides in the ability to provide a touch screen,
`
`20
`
`with which, in respect of other external dimensions of said screen, it is possible to
`create conditions which enable the external measurements of a mobile telephone
`
`unit to be reduced while, nevertheless, enabling the width of the display surface of
`a display unit to be made larger than the display surface of known mobile
`telephone units.
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`25
`
`A further technical problem resides in the ability to realise the significance of
`
`and the advantages associated with allowing an inventive touch screen to be used
`
`as an alternative, not solely for a typical keypad but also for a standard display
`surface of a mobile telephone.
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`30
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages afforded by utilising a display unit in the form of an LCD unit,
`
`so as to enable each "key" to be included on the screen in the form of a graphic,
`
`so that when a pen, pencil, finger or a fingertip is placed on the same location or
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`surface section where a key is presented, a chosen function and/or application
`corresponding to said graphic is activated and generated.
`Still another technical problem resides in the ability to realise the significance
`of and the advantages afforded by using an LCD unit, whose upper surface can be
`allocated different information carrying structures according to a chosen menu, for
`different sequences within an information transmitting mode.
`
`5
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages associated with orientating said light pulse emitting units and
`said light pulse receiving units adjacent said display unit, with the transmitting and
`
`10
`
`receiving directions of the light pulses being perpendicular to, or at least generally
`perpendicular to, a flat upper surface of the display unit.
`
`15
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`20
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`25
`
`Yet another technical problem resides in the ability to realise the significance
`
`of and the advantages associated with placing at least two, normally four, pulse(cid:173)
`deflecting devices close to the display unit and to its mutually opposite edge
`portions.
`
`Another technical problem resides in the ability to realise the significance of
`
`and the advantages associated with using as a supportive substrate a mobile
`
`telephone printed circuit board, that is capable of carrying an LCD unit or the like.
`
`A further technical problem resides in the ability to realise the significance of
`enabling a substrate to support not only said display unit but also said light pulse
`emitting and light pulse receiving units, where said light pulses have a frequency
`within the infrared range (IR range).
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages afforded by enabling said light. pulse emitting units and said
`
`light pulse receiving units to be connected to corresponding pulse generating
`circuits and pulse receiving circuits included in said substrate, through the medium
`of connection wires or the like.
`
`Another technical problem resides in the ability to realise the significance of
`
`and the advantages afforded by allowing the light deflecting devices or light pulse
`
`30
`
`deflecting devices to consist of a plurality of mirror units, co-ordinated with the
`casing of the mobile telephone unit.
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages associated with allowing said lfght pulse deflecting devices to
`
`consist of four mirror units, with their mirror surfaces orientated at 45 degrees in
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`relation to the propagation direction of the light pulses, from said angled light pulse
`generating units and to said angled light pulse receiving units.
`A further technical problem resides in the ability to realise the significance of
`and the advantages associated with allowing said light pulse deflecting devices to
`
`5
`
`consist of a separate right-angled equilateral, three-sided and right-angled prism
`unit, having a light pulse deflecting mirror surface, or a corresponding means.
`Another technical problem resides in the ability to realise the significance of
`and the advantages afforded by enabling a circuit board or a printed circuit board
`
`to carry electronic circuits and components adapted for carrying out functions
`related to the mobile telephone unit and/or to an associated mobile telephone
`
`10
`
`network.
`Another technical problem resides in the ability to realise the significance of
`and the advantages associated with allowing said light pulse emitting units and
`said light pulse receiving units to be orientated in respective rows and respective
`
`15
`
`columns, with mutual perpendicular orientations and with a distance between said
`
`rows or columns that only slightly exceeds the dimensions chosen with respect to
`
`said display unit.
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages associated with allowing said circuit board carrying, inter al,
`said display unit, said light pulse emitting units, said light pulse receiving units and
`
`20
`
`fixed components necessary to the function of the mobile telephone unit, to be
`
`adapted for attachment to a part of the complete casing of the mobile telephone
`
`unit.
`
`Another technical problem resides in the ability to realise the significance of
`
`25
`
`and the advantages afforded by fastening the edges of said light pulse deflecting
`
`devices along the raised rim portions of a recess in a casing part in the form of a
`replaceable lid, where said rim and said rim portions co-act with a transparent
`protective means, such as a plastic sheet.
`In respect of certain conditions where a plurality of side-related light pulse
`
`30
`
`receiving units and their associated pulse receiving circuits also indicate the
`
`absence of light pulses, another technical problem resides in the ability to realise
`
`the significance of and the advantages that are afforded by adapting the calcu(cid:173)
`lating unit to interpret this information, with the aid of internal computing circuits, as
`
`meaning that the intended geographical position shall be considered to be located
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`IPR2021-01041
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`between outer points representative of said pulse receiving circuits that indicate
`the absence of light pulses.
`In respect of certain conditions where a plurality of angled and side-related
`light pulse receiving units and associated pulse receiving circuits indicate, at the
`
`5
`
`same time, the absence of light pulses, another technical problem resides in the
`ability to realise the significance of and the advantages afforded by adapting the
`calculating unit to interpret this information, with the aid of internal computing
`circuits, as meaning that the intended geographical position shall be considered to
`
`be located between outer points representative of said pulse receiving circuits that
`indicate the absence of light pulses.
`
`10
`
`Another technical problem resides in the ability to realise the significance of
`and the advantages afforded by allowing said light pulse emitting units to be
`
`activated, through the medium of associated pulse generating circuits, either
`sequentially or in chosen positions in a predetermined order, and by allowing the
`
`15
`
`corresponding light pulse receiving units and their pulse receiving circuits to be
`also activated in said predetermined order.
`
`A further technical problem resides in the ability to r~alise the significance of
`and the advantages afforded by adapting a plurality of light pulse emitting units to
`emit light pulses consecutively over a chosen time duration, and by adapting one
`
`20
`
`single light pulse receiving unit to be activated, via its pulse receiving circuit, so as
`to receive expected light pulses during said chosen time duration and therewith
`allow registration of occurring light pulses and/or shadowed light pulses or the
`
`absence of light pulses.
`
`Another technical problem resides in the ability to realise the significance of
`
`25
`
`and the advantages afforded by adapting a plurality of light pulse receiving circuits
`
`so that light pulses emitted from a single light pulse emitting unit can be received
`consecutively during said time duration, and by adapting the light pulse receiving
`units so that said units will be active, via pulse receiving circuits, during said
`
`chosen time duration for receiving expected light pulses and therewith allow
`
`30
`
`registration of occurring light pulses and/or shadowed light pulses or the absence
`of light pulses.
`
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`IPR2021-01041
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`Solution
`The present invention takes as its starting point the known technology, as it is
`
`described above, and is based on a touch screen arrangement, which is built on or
`rests on a supportive substrate, and which is adapted for a mobile telephone
`apparatus or set and incorporated in the apparatus with the aid of a known display
`unit.
`
`With the intention of solving one or more of the aforesaid technical problems
`related directly to mobile telephone apparatus or sets, the invention proposes the
`use of an arrangement, constructed in principle in accordance with what is used
`and proposed within other technical fields, said arrangement comprising a number
`
`of light pulse emitting units together with a number of oppositely located light pulse
`receiving units, said units both being edge-related to the display unit of said mobile
`
`telephone.
`The light pulse emitting units are adapted to send light pulses sequentially
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`5
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`10
`
`15
`
`through a short distance over the upper surface of a display unit, via associated
`
`pulse generating circuits, said upper surface presenting a graphic, such as rows
`
`and columns of geographically disposed symbols, such as letters, numbers and/or
`
`corresponding graphics.
`
`The light pulse receiving units are adapted to receive light pulses sequenti-
`ally, and each of the pulse receiving circuits and pulse emitting circuits are co(cid:173)
`
`20
`
`ordinated and connected to a calculating or computing unit.
`The calculating unit will include calculating circuits, that function to evaluate a
`position representative of the geographical position on the upper surface of the
`display unit where light rays, such as intersecting light rays, are shadowed by a
`pointer, such as the front surface part of a user's thumb, depending on the position
`
`25
`
`of one or more co-ordinate orientated light pulse receiving units and their
`
`associated pulse receiving circuits that should indicate the presence of a light
`pulse.
`
`By way of proposed embodiments, that lie within the scope of the present
`
`30
`
`invention, it is particularly proposed that said light pulse emitting units and said
`light pulse receiving units are orientated adjacent said display unit, with the light
`
`pulse emitting and light pulse receiving directions being at right angles, or at least
`
`generally at right angles, to a planar upper surface oUhe display unit.
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`Also proposed is the use of a number of light pulse deflecting devices, such
`as four devices, that are orientated close to the display unit and that function to
`cause mutually intersecting light pulses to pass parallel across the upper surface
`of the display unit.
`By way of proposed embodiments that lie within the scope of the inventive
`
`concept, it is also proposed that a supportive substrate is comprised of a circuit
`board or printed circuit board of the mobile telephone unit.
`
`In addition to carrying the display unit, the substrate is also adapted to carry
`
`said light pulse emitting and light pulse receiving units.
`
`The light pulse emitting units and the light pulse receiving units are connec-
`ted to said pulse generating circuits and said pulse receiving circuits co-ordinated
`on the supportive substrate, by connecting wires or the like.
`
`Each of the light pulse deflecting devices may comprise a mirror unit, or a
`mirror portion, carried by the casing to provide a corresponding effect.
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`5
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`10
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`15
`
`The light pulse deflecting devices may comprise mirror units that have mirror
`surfaces or casing-carried mirror surfaces orientated at 45 degrees in relation to
`
`the direction of propagation of the light pulses emitted by said light pulse emitting
`
`units towards said light pulse receiving units.
`
`The light pulse deflecting devices may also comprise a right-angled
`equilateral, three-sided and right-angled prism unit.
`
`20
`
`The circuit board or printed circuit board, that functions as a substrate, may
`also support electronic circuits and components adapted to perform functions rela(cid:173)
`
`ted to the mobile telephone unit or set.
`
`25
`
`The light pulse emitting units and the light pulse receiving units are orientated
`in two rows and two columns of mutual perpendicular orientations, with a distance
`between said rows and columns that only slightly exceeds corresponding dimen(cid:173)
`sions of said display unit.
`
`It is also proposed that the circuit board or printed circuit board that includes,
`inter al, display units, light pulse emitting units, light pulse receiving units, and
`
`30
`
`fixed components, necessary to carry out the normal functions of the mobile
`
`telephone unit, is adapted to enable it to be fastened to or against part of the
`casing of the mobile telephone unit.
`
`The light pulse deflecting devices are fasten~d, edge-orientated, along the
`
`raised rims of a replaceable lid or cover, said rims, or parts of said rims, co-acting
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`with and supporting a transparent protective device, such as a plastic or glass
`
`sheet.
`It is also proposed in accordance with the invention that conditions are
`provided whereby, when a plurality of side-related light pulse receiving units and
`their associated pulse receiving circuits indicate simultaneously the absence of
`light pulses, the calculating unit will interpret this information, with the aid of
`internal calculating circuits, as indicating that the intended geographical position
`shall be considered to be located at or between points representative of said light
`
`5
`
`pulse receiving units, as an indication of the absence of light pulses.
`In respect of conditions where a plurality of angled and side-related light
`
`10
`
`pulse receiving units, and their associated pulse receiving circuits, simultaneously
`indicate the absence of light pulses, the calculating unit functions, with the aid of
`
`internal calculating circuits, to interpret this information to mean that the intended
`geographical position shall be considered to be located at one point or between
`
`15
`
`points representative of said light pulse receiving units that indicate the absence of
`
`light pulses.
`It is also proposed that when said light pulse emitting units are activated, via
`
`associated pulse generating circuits, either sequentially or positioned selectively in
`
`a predetermined order, the corresponding pulse receiving circuits shall also be
`capable of being activated in the same predetermined order.
`
`20
`
`A plurality of light pulse emitting units may be adapted to consecutively emit
`light pulses with the aid of said pulse generating circuits over a chosen time
`
`duration, wherein one single light pulse receiving unit is adapted to be activated to
`
`receive anticipated light pulses during said chosen time duration and therewith
`allow occurring light pulses and/or shaded light pulses or the absence of light
`
`25
`
`pulses to be registered through the medium of an associated pulse receiving
`circuit.
`
`A plurality of light pulse receiving units may be adapted to receive light
`pulses emitted from one single light pulse emitting unit consecutively during a
`
`30
`
`chosen time period, wherein each of the light pulse receiving units is adapted to be
`activated, via associated pulse receiving circuits, to receive light pulses during said
`
`chosen time period and therewith allow occurring light pulses and shadowed light
`pulses and/or the absence of light pulses to be registered.
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`IPR2021-01041
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`Advantages
`Those advantages primarily characteristic of the present invention and the
`
`5
`
`particular significant characteristics of said invention reside in the creation of
`conditions, which enable the creation of a touch screen arrangement for a mobile
`telephone apparatus or telephone unit or set on the basis of the technology
`described in the introduction, wherein edge-related light pulse emitting units and
`light pulse receiving units adjacent associated light pulse deflecting devices may
`be mounted adjacent the edge surfaces of a display unit or an LCD unit, and also
`
`in that the touch screen can thereby be given a particularly thin design, with low
`energy consumption and a limited power input.
`
`10
`
`More particularly, the invention makes possible clear evaluation of a small
`
`chosen surface section of a small display surface with the aid of the front surface
`
`part of a thumb, said surface part covering a surface section that greatly exceeds
`the small chosen surface section.
`
`15
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`20
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`25
`
`30
`
`The primary characteristic features of the present invention are set forth in the
`
`characterising clause of the accompanying Claim 1.
`
`Brief description of the drawings
`An embodiment at present preferred and including significant characteristic
`features of the present invention will now be described in more detail by way of
`example and with reference to the accompanying drawings, in which;
`Figure 1 is an exploded perspective view of a touch screen constructed in
`accordance with the invention and placed in a mobile telephone set;
`Figure 2 illustrates in side view and in a section, taken on the line 11-11 in
`Figure 1 , a mobile telephone set and a touch screen assembly;
`Figure 3 is a section view, according to Figure 2, and shows a narrow pointer
`resting on the upper surface of a display unit for shadowing a light pulse;
`Figure 4 illustrates an example of pulse-form activation of the light pulse
`emitting and light pulse receiving units used, through the medium of pulse
`generating and pulse receiving circuits belonging to said units;
`Figure 5 is a horizontal view of a mobile telephone set that uses a touch
`screen in accordance with the present invention, and shows a narrow pointer
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`positioned to rest on a surface section of the display unit, said section corres(cid:173)
`
`ponding to a graphic symbol in the form of the number "3";
`Figure 6 is a schematic view of a planar display unit which is surrounded by
`a number of light pulse emitting and light pulse receiving units disposed in right-
`angle co-ordinates, in which a well-defined geographic point is shown to give a
`pronounced pulse shadow or the absence of light pulses in respect of two mutually
`
`perpendicular light pulse receiving units;
`Figure 7 illustrates an embodiment in which a large and diffuse geographic
`point creates a pulse shadow for at least two light pulse receiving units orientated
`
`at right angles and in pairs;
`Figure 8 illustrates an alternative embodiment for evaluating a geographic
`position valid for a geographic point;
`Figure 9 illustrates a practical application of the principles indicated in Figure
`6 for activating a "key" or "button"; and
`Figure 10 illustrates a further practical application of the principles indicated
`in Figure 6 for activating another key or button for activation of a mobile telephone
`
`function.
`
`s
`
`10
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`15
`
`Description of embodiments at present preferred
`It is pointed out initially that we have chosen to use in the following
`
`20
`
`description of embodiments at present preferred and including significant charac(cid:173)
`
`teristic features of the invention and illustrated in the figures of the accompanying
`
`drawings special terms and terminology with the intention of illustrating the
`
`inventive concept more clearly.
`
`25
`
`However, it will be noted that the expressions chosen here shall not be seen
`
`as limited solely to the chosen terms used in the description, but that each term
`chosen shall be interpreted as also including all technical equivalents that function
`
`in the same or at least essentially the same way so as to achieve the same or
`essentially the same intention and/or technical effect.
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`30
`
`Figure 1 thus illustrates schematically an embodiment and an application of
`the present invention, said figure concretising generally the significant properties
`
`of the embodiment described in more detail below.
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`Thus, Figure 1 is a perspective exploded view of a mobile telephone appara(cid:173)
`tus T whose casing parts 10, 11 enclose a touch screen arrangement 1, that rests
`
`on a supportive "substrate" 2, among other things.
`The supportive substrate 2 of the illustrated embodiment has the form of a
`printed circuit board or a circuit board 2' of known design.
`Figure 1 is an exploded view of a mobile telephone apparatus T that includes
`
`a display unit 3 and edge-orientated light pulse emitting units 4 and oppositely
`
`located edge-orientated
`
`light pulse receiving units 5, which extend along
`
`respective sides of said display unit 3.
`Although not shown, the "substrate" 2 may include edges that are raised from
`a display unit 3, in the form of a known LCD unit.
`It is obvious that the basic principles of the present invention can be
`
`implemented solely with the use of rows or columns of light pulse emitting units 4
`and oppositely located rows or columns of light pulse receiving units 5 with
`
`5
`
`10
`
`15
`
`respective associated circuits 4a and 5a, at least with respect to the activation of
`certain functions.
`
`20
`
`25
`
`It will be understood, from the following description of the illustrated embodi(cid:173)
`
`ment, that the touch screen 1 belonging to the mobile telephone T is built around
`the display unit 3, with a number of light pulse emitting units 4, 4' orientated at
`right angles, and a number of light pulse receiving units 5, 5' orientated at right
`
`angles, said units being edge-related and surrounding said display unit 3 resting
`on the substrate 2.
`
`For the sake of simplicity, requisite devices and connections to the substrate
`2, and requisite functions for driving the LCD unit 3 in a known manner are not
`shown.
`
`The units 4, 4' that emit pairs of mutually intersecting light pulses are adapted
`
`to emit short IR light pulses through the medium of pulse-generating circuits 4a,
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`4a'. One such IR light pulse is referenced 40 in Figure 2, where it is shown
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`orientated at a very small distance over the upper surface 3a of the display unit 3.
`
`30
`
`Figure 2 shows three light pulse paths 40, 41 and 42, although for the sake of
`
`simplicity only the light pulse path 40 will be described in the following description.
`
`The upper surface 3a shall be capable of presenting a number of graphic
`symbols in a known manner.
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`GOOGLE v. NEONODE
`IPR2021-01041
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`Page 434 of 1315
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`15
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`In the illustrated embodiment, this graphic display is chosen to comply with a
`chosen menu of a mobile telephone apparatus T.
`
`5
`
`Although these graphic symbols are shown to consist of digits (Figure 5)
`orientated in rows and columns in the case of the illustrated embodiment, it will be
`understood that a display unit 3 in the form of an LCD unit can be caused to
`present a number of other symbols, such as digits/letters, words, sentences or
`corresponding graphic symbols, depending on the menu chosen.
`Figure 6 illustrates schematically a number of pulse receiving circuits 5a, 5a'
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`co-ordinated in right angle orientations, said circuits being adapted to receive
`signals from light pulses detected by the light pulse receiving units 5, 5', said units
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`10
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`being referenced 5S, 5R, 5Q ..... 5J, 51 in one column, and 5'A, 5'8 ..... 5'G, 5'H in
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`one row.
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`15
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`20
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`25
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`A number of pulse emitting units 4, 4' in right angle orientation are adapted to
`emit light pulses via the control from co-ordinated pulse generating circuits 4a, 4a',
`said column-related pulse emitting units 4 being referenced 41, 4J, 4K .... 4R, 4S,
`while the row-related units 4' have been referenced 4'H, 4'G, 4'F ... 4'B, 4'A.
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`The pulse receiving circuits 5a, 5a' are of a known kind and each circuit is
`
`adapted to generate current pulses or voltage pulses corresponding to the light
`pulses that are received by corresponding light pulse receiving units 5, 5', and to
`transpose these pulses into signal information sent to a calculating unit 6.
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`More specifically, the calculating unit 6, shown in Figure 4, functions to
`activate each of the row-orientated units 4'H to 4'A and each of the column(cid:173)
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`orientated units 41 to 4S in a chosen order and, at the same time, open the
`oppositely located pulse receiving circuits 5a' and 5a.
`This means that when the calculating unit 6 activates a light pulse emitting
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`unit 4P during a time slot, the calculating unit 6 will expect said light pulse to be
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`detected by the light pulse receiving unit 5L during the same time slot.
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`In such case, the calculating unit 6 allows associated calculating circuits,
`such as circuit 6a, to take an inactive state.
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`30
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`On the other hand, if the expected light pulse fails to arrive, e.g. is shadowed
`by a pointer 9, the calculating circuit 6a is activated.
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`The calculating unit 6 thus includes a plurality of calculating circuits, of which
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`a calculating circuit 6a is adapted to allow the geographic position of the point P1
`and its related row to be evaluated, depending on the position and the row (or
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`GOOGLE EXHIBIT 1043
`GOOGLE v. NEONODE
`IPR2021-01041
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`Page 435 of 1315
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`WO 03/038592
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`16
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`column) of one or more co-ordinate orientated, light pulse receiving column-related
`units 5S - 51, one of which is ref