WO2012163725A1

WO2012163725A1 - Display having an integrated optical transmitter

Info

Publication number: WO2012163725A1
Application number: PCT/EP2012/059449
Authority: WO
Inventors: Uwe Hill; Wolfgang Jörger
Original assignee: Mechaless Systems Gmbh
Priority date: 2011-05-31
Filing date: 2012-05-22
Publication date: 2012-12-06
Also published as: DE112012002330A5

Abstract

The invention relates to a display having an integrated optical transmitter, comprising an optical element (4), which is preferably a diffuser (5), a modulatable optical filter (2), and a plurality of modulatable light sources or illumination LEDs (8) for illuminating the display. The light emitted by the illumination LEDs (8) passes through the optical element (4) and illuminates the modulatable optical filter (3) from the back. At least one optical transmitter (12) is arranged below the modulatable optical filter (2).

Description

Display with integrated optical transmitter

The present invention relates to a display or a display module with an integrated optical transmitter. The display comprises an optical element, a modulatable optical filter, which is preferably a liquid crystal layer, and a plurality of controllable light sources, in particular illumination LEDs for illuminating the display. The light emitted by the controllable light sources or illumination LEDs is passed through the optical element and illuminates the modulatable optical filter.

Displays are used today in many technical devices, for example in the PC sector as well as in TV sets. Modern mobile phones, so-called smartphones, now also have a display. The displays are mainly based on LCD technology, whereby a liquid crystal layer, the so-called LCD layer, is illuminated by the illumination LEDs. For the most part, the displays have a touch screen interface, which is used in particular in mobile computers and mobile phones. Even with public user terminals, touchscreens can be found. For this it is necessary that the user the surface of the display which is often located behind a glass plate, so that the liquid crystal layer is not directly touched. On a touch screen display, individual keys displayed on the screen can be activated. It is also possible to perform a swipe or other movement on the surface detected by the touch screen module. These movements are used, for example, to enlarge or reduce the content displayed or to scroll.

Touching the touchscreen display to the controller leads to contamination that, on the one hand, degrades the optimal display of the contents on the display and, on the other hand, can be uncomfortable for the users, for example in public terminals. In addition, there is a risk of damaging this electronic component by electrostatic discharge (ESD) and mechanical damage, such as scratches. Furthermore, germs may be transmitted when different people use the same touch screen. There is therefore a need for further operating options for such displays. Object of the present invention is therefore to provide operating options for a display even if no direct contact with the surface takes place or so that no contact of the surface is necessary. The object is achieved by a display with integrated optical transmitter having the features of claim 1.

The already known and existing displays are extended by the possibility to also support sensor applications such as the contactless recognition of approaches or gestures. In this case, not only simple proximity sensors, but also complex sensors for gesture control can be integrated in the display. The display, which is also referred to as a display module, comprises a modulatable optical filter which Preferably, a liquid crystal layer or LCD layer is an optical element, which is preferably passive and more preferably a diffuser, and a plurality of modulated light sources, preferably illumination LEDs, for illuminating the display. The light emitted by the modulatable light sources or the illumination LEDs is guided through the optical element and illuminates the modulatable optical filter, that is to say preferably the LCD layer. In addition, the display also includes at least one optical transmitter in addition to the conventional components. The optical transmitter necessary for gesture control is located below the modulatable optical filter. The optical transmitter is integrated in the display or display module which is part of a television, a mobile computer or a cellular phone. The transmitter radiates through the optical filter (and an optional glass plate as display cover), allowing gesture recognition of gestures above the display.

In a preferred embodiment, the display is an LCD display whose modulatable optical filter is a liquid crystal layer. However, the invention is not limited to LCD displays. Other displays such as OLED displays, M EMS displays, "E-ink" displays (similar to a so-called electronic paper, e-paper or e-paper) can also be used. These display types can be extended with the new functionality of contactless and non-contact recognition of gestures and control commands above the display.

In an LCD display, the modulatable light sources are usually designed as illumination LEDs. In the following, therefore, the term lighting LED will be used for the sake of simplicity. It is not limiting, however. Those skilled in the art will appreciate that other modulatable light sources can be used to realize a display. The display according to the invention has the advantage that the functionality in contactless gesture recognition is already integrated in the display. In mobile phones or other devices, the display is often a display module that is installed in the actual device. Since the necessary sensor system is integrated in the display module, the design effort of the OEM is greatly reduced. This is especially the case with mobile phones. In addition, the manufacturer of the terminal requires no understanding of the system for the already integrated measuring system for gesture recognition. The display module according to the invention has the advantage that no additional space is required in the device itself. Thus, very compact mobile devices can be produced, especially those that have no or an extremely small edge of the housing around the display. The present invention can preferably be used, for example, in modern mobile telephones, on the upper side of which there is no visible edge of the housing. In that regard, the display of the invention has significant advantages over a sensor system, as proposed in WO 201 1/160079. There, the sensor system is located below the housing, in particular on the edge of the housing and not in the display. However, this solution requires additional space. Although it is independent of the display, but at the same time requires a larger design effort and a higher production cost, since the individual components of the sensor system must be additionally integrated into the housing. In the context of the invention it has been found that, in particular in modern smartphones, the display or display module is essentially the only contiguous and defined installation space. If a non-contact gesture control is to be achieved in such a smartphone, it can be done simply by using the display module or display according to the invention by the sensors for gesture control is integrated. Thus, the resulting limitations on the placement of gesture recognition sensors and the space available do not matter in design. The integration of the optical transmitter (s) into the Display gives great freedom here. The optical transmitter is preferably an infrared diode. In this case, the LCD display should preferably be chosen so that it does not co-modulate or otherwise alter the transmission of the I R radiation (infrared radiation) of the infrared diode.

If the optical filter, for example the LCD layer of the display, responds at least twice as fast as the human eye, however, it is also conceivable to modulate the transmission signal of the integrated optical transmitter via the display itself. In this case it is sufficient if the transmitter, for example the transmitter diode, supplies a static polarized light signal. Of course, other modulations for the transmission signal of the optical transmitter are conceivable.

In a preferred embodiment, one of the illumination LEDs is replaced by the optical transmitter, preferably by an infrared diode. Thereby, the transmitter can be placed at the location of one of the plurality of illumination LEDs. There is no additional space required for the transmitter. The image quality and illumination homogeneity is not affected thereby, at least not noticeable.

Preferably, the display comprises an optical receiver, preferably a receiving diode, located below the modulated optical filter, e.g. the liquid crystal layer is integrated. Particularly preferably, one of the illumination LEDs is replaced by the receiving diode. In this way it is possible to integrate an optoelectronic sensor in the display. The preferred sensor comprises the integrated optical transmitter, that is to say preferably the infrared diode, as well as the optical receiver, preferably the receiving diode, and permits optical recognition of approximations or gestures in front of the display.

In a preferred embodiment, at least two optical transmitters and one receiving diode are integrated in the display. In this case, one of the optical transmitters is preferably a transmitting diode and the further optical transmitter a Compensation diode. In this way it is possible to build a compensating measuring circuit and to integrate the entire sensor, as used for example in so-called Halios circuits, in the display. The measurement systems based on the Halios method are described in greater detail, for example, in EP 1 671 160 B1 and EP 0 706 848 B1.

A system operating according to the Halios principle has the advantage that a gesture control and detection of objects above the display is possible independently of the prevailing ambient light. Especially in strong sunlight, the Halios system works reliably and very robust.

Preferably, the display comprises an electronic board, which is preferably arranged below the diffuser or below the illumination LEDs. The display control is preferably integrated in the board. In the electronic

15 board is preferably also a control and evaluation for the optical transmitter and / or the receiving diode integrated. It is also possible to integrate the control and evaluation electronics for an optical sensor or a Halios measurement circuit. In this way it is possible to integrate the entire gesture control and the electronics for contactless operation into the

20 existing display control, for example, an integrated module (IC) record. An additional component in the display is thus not necessary.

In a preferred embodiment, the display comprises a board, the

25 has at least one opening, which is arranged near the optical transmitter. Preferably, the board has another opening located near an optical receiver of the display. In this way, the infrared radiation can be blasted down through the board. Thus, a gesture recognition can also be below the display or below a

30 mobile device. This may be additional or alternative to a

Radiation of the infrared radiation through the liquid crystal layer (ie up) done. It can thus be a gesture recognition below and implement above the display, preferably one or both of the gesture recognition can be active.

In a preferred embodiment of the display, the control and evaluation electronics comprise the compensating measuring or control circuit for controlling the compensation diode and / or for controlling the optical transmitter or the infrared diode. The compensation diode is preferably regulated in such a way that the transmission signal of the optical transmitter received by the receiving diode or the receiver is compensated. Thus, it is possible that the control circuit always operates at the optimum operating point and a robust external light compensation can be done. The drive and evaluation electronics for the optical transmitter or the optical sensor can be integrated in an integrated circuit, such as an IC or ASIC. Preferably, the control and evaluation is integrated on the board for the display control.

In a preferred embodiment, the control and evaluation electronics are designed such that the optical transmitter and / or the optoelectronic sensor comprising the transmitter and the receiver as well as the compensator are not power-controlled. There is only an adaptation of the modulated signal. The radiated power is not regulated.

In a preferred embodiment, the optical transmitter, in particular the transmitter designed as an infrared diode, is integrated in the optical element. Preferably, additionally or alternatively, the optical receiver or the

Receiving diode integrated in the optical element. The optical element is preferably a diffuser and thus has the task of diffusing the light emitted by the illumination LEDs diffuse light, so therefore to influence. In this way, the most uniform possible backlight is used for the optical filter, which is preferably designed as a liquid-crystal layer. However, this feature is detrimental to the transmitter and the receiver as well as the compensator. Integrating the transmitter, the receiver and / or the compensator eliminates this disadvantage. The Integration may be accomplished by forming recesses or by forming at least one channel, which is preferably a continuous channel when the elements are disposed below the optical element. Neither the recesses nor the channels have a visible and noticeable influence on the image quality and lighting homogeneity of the display.

It has proved to be advantageous if the optical element has, for example, a recess or a blind bore which is open toward the modulatable optical filter. In this way, the optical transmitter can transmit radiation through the optical filter to the outside, wherein this radiation is not affected by the optical element. The radiation of the transmitter reflected outside the display can be received by the optical element without being influenced by the optical element. The blind hole is to be constructed according to the desired applications of the display. It can have different expansions. It is also possible that only one depression or depression is used in the surface of the optical element for the placement of the diodes. The side surfaces of the recess may be coated, so that a directional radiation is generated. Of course, the compensator or the compensation diode can also be integrated in the optical element, for example, connected near the receiver in a common recess or through a channel. In a likewise preferred embodiment, the optical element has at least one channel through which the radiation emitted by the optical transmitter can pass through the optical element. The channel is designed such that the radiation passes through the optical element substantially unaffected. Such an embodiment has proven to be advantageous if the optical transmitter and / or the receiver are arranged below the optical element. The invention will be explained in more detail with reference to specific embodiments shown in the figures. The peculiarities illustrated therein may be used alone or in combination to provide preferred embodiments of the invention. The described embodiments do not limit the invention defined by the claims in their generality.

a schematic diagram of an LCD display, which is designed as a full LED; a schematic diagram of an LCD display with edge LEDs;

FIG. 2 a shows the LCD display according to FIG. 1 a extended by the optical transmitters according to the invention;

FIG. 2b shows an LCD display according to FIG. 1b enlarged by the optical sensor according to the invention;

Figure 2c is a schematic plan view of the LCD display according to

Fig. 2b;

3a, 3b, another embodiment of an inventive

LCD displays with full LED or edge LED illumination;

4a-c each a detailed drawing of an optical element and optical filter of the display according to the invention;

Figure 5a, b is a schematic representation of a display with three transmitters; Figure 6 is a schematic representation of a gesture control in a smart phone.

5 Figures 1 and 2 show a conventional display module, which is designed as an LCD display 1. Such displays have a backlight, which consists of white LEDs, which are either distributed over the entire display surface or distributed only at the edge. Displays with full-surface arranged behind the display surface illumination LEDs 8 i o are referred to as a full-LED display (see FIG. 1 a); those with an arrangement of the illumination LEDs 8 at the edge as edge LED displays (see Fig. 1 b).

The terms display and display module are used synonymously and refer to the necessary components arranged on a display board 11. The core of these displays 1 is a modulatable optical filter 2, which is formed in LCD displays as a liquid crystal layer 3 (liquid crystal layer). Below the liquid crystal layer 3, an optical element 4 is arranged in the display 1, which is preferably a diffuser 5. Optional can

20 above the optical filter 2, a glass plate 6 may be arranged to a

Protecting the liquid crystal layer 3 to form and in particular to increase the brilliance of the display 1. The components are arranged on a circuit board 11 and encompassed by a display module frame 10.

In the full LED embodiment according to FIG. 1 a, a light box 7 is preferably arranged below the diffuser 5, in which a plurality of illumination LEDs 8 are positioned. The illumination LEDs 8 radiate through the diffuser 5 from behind onto the liquid crystal layer 3 and can thus make the information displayed there visible. The diffuser 5 has the task, the

30 light emitted from the illumination LEDs 8 uniformly (homogeneously) to the liquid crystal layer 3 to scatter. The illumination LEDs 8 are usually arranged in an array 9, which is also referred to as "Array Lit LED Lightbox". The optical components Lightbox 7, Diffuser 5 and Fluids Crystal layer 3 are laterally framed by an elastomeric strip 9 in the display module frame 10.

At the lower end of the lateral frame parts 10, the electronic board 5 1 1 is arranged, in which the display control is integrated. The circuit board 1 1 also shields the display 1 downwards so that the light emitted by the illumination LEDs 8 is emitted only in the direction of the diffuser 5. In the case of an edge LED display according to FIG. 1 b, the diffuser 5 is arranged directly between the liquid-crystal layer 3 and the circuit board 11. The illumination LEDs 8 are arranged in a lightbox 7 at the edge of the diffuser 5, so that the diffuser 5 is illuminated from the side. This allows a flatter construction of the display 1. However, it has the disadvantage that the

15 illumination of the liquid crystal layer 3 through the diffuser 5 is not as homogeneous as in the full-LED variant. The light box 7 is preferably provided with the exception of the side facing the diffuser 5 7a on the other sides with an opaque layer so that the visible light is passed exclusively into the diffuser 5. Thus, no visible radiation occurs

20 on the other sides of the Lightbox 7 off.

At least one of the illumination LEDs 8 is replaced by an optical transmitter 12, which is preferably formed as an infrared diode 13 (IR diode). Accordingly, according to the invention, at least one of the illumination LEDs 8 in the lightbox 7 is replaced by an infrared diode 13. This can for example be positioned at the edge of the lightbox 7 or at one of the corners, as shown in FIGS. 2a and 2b. 2a shows two infrared diodes 13 on the outer right and left edge of the lightbox 7. The corresponding lighting

30 LEDs 8 are replaced by the infrared diodes 13. The visible light-impermeable coating of the lightbox 7 preferably has areas in the region of the infrared diodes 13 on the side directed toward the liquid-crystal layer 3 (upper side of the display 1) of the lightbox 7, which are for the infrared radiation the infrared diode 13 is transparent, so that the IR radiation can pass through the coating unhindered. The infrared diodes 13 radiate infrared radiation through the liquid crystal layer 3, so that detection of gestures above the display 1 (above the liquid crystal layer 3) 5 is possible. In this case, the radiation of the infrared diodes is preferably not additionally modulated by the liquid crystal layer.

Alternatively or additionally, 1 1 openings may be disposed near the infrared diodes 13 in the circuit board, so that the infrared diodes 13 can radiate down i o through the board 1 1. Thus, a recognition of gestures below the display 1 or below the mobile device is possible. In this case, the housing of the mobile device must be transparent to the infrared radiation at least locally at the relevant points. Preferably, a receiver 14 is arranged in the lightbox 7. The board 11 has in these

15 sem case, another opening in the board 1 1 near the receiver 14, so that from an object or e.g. can be received by a hand outside of the Displayl or the mobile device reflected radiation.

FIG. 2c shows a section along the line A-A from FIG. 2b. In this plan view, it becomes clear that a plurality of IR diodes 13 are arranged in the lightbox 7 and replace the illumination LEDs 8 originally positioned there.

Of course, it is possible to provide a plurality of light boxes 7 with illumination LEDs 8 in the case of a display 1 with laterally arranged illumination LEDs 8. The homogeneity of the illumination of the liquid crystal layer 3 can be improved. Infrared diodes 13 can then be positioned in several corners of the display 1.

In a preferred embodiment, one of the illumination LEDs 8 of the display 1 is replaced by a receiving diode 14 in order to receive the signals emitted by the transmitter 12 after reflection, for example a hand outside the display 1. The receiving diode 14 is preferably under the liquid crystal layer 3 is arranged, preferably below the diffuser 5. In an embodiment as a full-LED display according to Fig. 3a and 3b is preferably a lighting LED 8 near the middle or in the middle of the lightbox 7 replaced by the receiving diode 14. In three corners of the lightbox 7 5 instead of the LEDs 8 infrared diodes 13 are arranged. By a suitable arrangement of the receiving diode 14, the distance to the existing transmitters 12 in the lightbox 7 can be selected as equal as possible.

In Fig. 3a and 3b, in addition to the four illumination LEDs 8, which are replaced by the infra red diodes 13 in the corners of the lightbox 7 and by the receiving diode 14 in the middle of the lightbox 7, a further illumination diode 8 by replaced a compensation diode 17 as a compensator. It is preferably arranged close to the optical receiver, which is the receiving diode 14, and preferably radiates directly to the receiving diode 14. In any case, 15 should preferably receive no radiation from the compensation diode 17 to the outside and thus into the transmission path from the transmitters 12 to the receiving diode 14 , Such an arrangement with a gesture recognition according to the Halios principle is shown in Fig. 3a. In this way, the simplest possible gesture recognition according to the Halios principle can be realized. It is self-evident

It is also possible to use a plurality of compensation diodes 17.

As one skilled in the art is aware, multiple transmitters 12 and infrared diodes 13 are positioned in the display 1 when complex and / or three-dimensional gesture control is desired. However, at least two transmitters 12, 25 are preferably to use at least three transmitters 12.

Fig. 3b shows schematically the transmission paths from the infrared diodes 13 to the receiving diode 14 and the lightbox 7. The liquid crystal layer 3, the illumination LEDs 8 and other parts of the display 1 are for reasons

30 of the clarity not shown. The radiation emitted by the infrared diodes 13 (arrows A), which comprises a transmission signal, is reflected on an object, here for example a hand. The reflected radiation (arrows B) reaches the receiving diode 14. At the same time, in addition to the reflector Signals also a compensation signal directly from the compensation diode 17 to the receiving diode 14, which is superimposed with the reflected signals in the receiving diode and further processed in a measuring circuit, which may be integrated, for example, on the board 1 1 of the display 1. At such a regulation takes place that the received signals received by the receiving diode 14 of the optical transmitter 12 is compensated by the compensation signal of the compensation diode 17.

The control and evaluation for the gesture control is preferably i o also integrated in the board 1 1. It can be arranged in a separate chip on the circuit board 1 1, for example as an integrated circuit (IC module).

The diffuser 5 is designed to scatter the light emitted by the illumination LEDs 8 before it strikes the liquid crystal layer 3. However, this scattering effect is unsuitable for the transmitted transmission signals of the transmitters 12. Preferably, therefore, a material is to be used as a diffuser 5, which does not scatter the infrared radiation, but the light radiation of the illumination LEDs 8. The diffuser 5 is thus preferably for the infrared radiation 20 "transparent" and diffuse simultaneously for the light radiation in the visible range scattering.

Alternatively and particularly preferably, the transmitters 12 or the IR diodes 13 and / or the receiving diode 14 are integrated in the diffuser 5. In this version

25 form no illumination LEDs 8 are replaced, but integrated the additional components for the gesture control in the display module. According to Fig. 4a, the diffuser 5 may have a recess 25 or a blind bore 15 which receive the components. Optionally, the blind bore 15 is lined on the inside so that no infrared radiation directly

30 passes from the infrared diode 13 to the receiving diode 14. This can be done for example by a metallization, coating or the like, wherein this coating is preferably carried out on the inside of the blind bore for the infrared diode 13. In the case of the arrangement of a compensation diode de 17 in the diffuser 5, the radiation from the compensation diode 17 to the receiving diode 14 can be made diffuse. Such a damped radiation between the compensation diode 17 and the receiving diode 14 is sufficient and advantageous in many cases, since reduced levels are partly wanted. Alternatively, the compensation diode 17 and the receiving diode 14 may be arranged in a common recess 25.

In a particularly preferred embodiment according to FIG. 4b, the diffuser 5 has a channel 16 in the region of the infrared diodes 13 and the receiving diode 14. The channel 16 is designed such that it allows the radiation emitted by the infrared diode 13 to pass through substantially unaffected. For example, the channel 16 may be realized by a through hole. The infrared radiation passes unhindered through the diffuser 5. Also in this embodiment, a lining of the channel 16

15 on its inner sides 21 conceivable to prevent direct interference of the receiving diode 14 by the infrared diode 13. Such "cross-talk effects" are undesirable.

In a likewise preferred embodiment (FIG. 4 c), the diffuser 5 20 in the region of the infrared diodes 13 and / or the receiving diode 14 has a lens 22 which can be produced by appropriate material processing of the diffuser 5. This results in a bundling of the transmitted transmission signal of the infrared diode 13, so that the transmission radiation of the infrared diodes 13 almost unhindered, preferably in an advantageous manner.

25 flows through the diffuser 5 occurs. The advantageous influence can be realized, for example, by two lenses 22 on the top and bottom of the diffuser 5 in order to realize a bundling or spreading of the radiation, wherein upon entry into the diffuser 15 preferably initially bundling of the radiation occurs and at Exit from the diffuser 5 a

30 expansion of radiation or spreading. This ensures, on the one hand, that the transmission radiation of the infrared diodes 13 reaches the shortest possible path through the diffuser 5. On the other hand, as a result of the spreading on exiting from the diffuser 5, the largest possible area becomes half of the display "lit" so that the area for the gesture recognition above the display 1 as large as possible, at least designed in a predetermined manner.

FIG. 5 a shows a detailed section through a display module 1, in which the illumination LEDs 8 are arranged all over under the liquid crystal layer 3 (full LED display).

Below a glass layer 18, a color layer 19 is arranged. The liquid crystal layer 3 adjoining it is enclosed by a plurality of electrodes 20 on both sides. The liquid crystal layer 3 is actuated by means of the electrodes 20. Below the liquid crystal layer 3, the diffuser 5 is positioned, which optionally may have channels 16, which are not shown in FIG. 5a. The adjoining the diffuser 5 15 Lightbox 7 has a plurality of illumination LEDs 8. One of the LEDs 8 in Fig. 5a is replaced by an infrared diode 13 as a transmitter 12.

Fig. 5b also shows a schematic representation of a display 1 according to the invention, in which the LED backlight is a full LED. In

20 three corners of the display 1 infrared diodes 13 are arranged, each replacing a lighting LED 8. In this way it is possible to realize a gesture recognition and / or to produce an optical switch. The L-shaped arrangement of the infrared diodes 13 shown in Figure 5b has proved to be advantageous for the optoelectronic gesture control. Will only one

25 infrared diode 13 used as a transmitter 12, so no complex gesture control can be realized. However, it is possible to construct a proximity sensor.

Particularly in the case of larger LED panels or LCD displays, such as monitors or television sets, for example, more than three infrared diodes 13 may also be arranged in the display 1. For example, multiple infrared diodes 13 may be used along the sides. This allows the display to be operated close up. Fig. 6 shows a mobile telephone 23 with a relatively small display 1 with a screen diagonal of about 4 ".These displays 1 are typical in mobile telephones or mobile devices, such as video players or music players (eg iPod) Transmitter 12 integrated in the display module 1, so that a good recognition of non-contact gestures can take place.

Claims

claims

Comprising display with integrated optical transmitter

an optical element (4)

a modulatable optical filter (2)

a plurality of modulatable light sources, in particular illumination LEDs (8) for illuminating the display (1),

wherein light emitted by the modulatable light sources, in particular the illumination LEDs (8) is guided through the optical element (4) and illuminates the modulatable optical filter (2), characterized in that at least one optical transmitter (12) is located below the modulatable optical Filters (2) is arranged.

Display according to claim 1, characterized in that the display (1) is an LCD display and / or the integrated optical transmitter (12) is a diode (13), preferably an infrared diode (13) and / or the modulatable optical Filter (2) is a liquid crystal layer (3) of the display (1).

Display according to claim 1 or 2, characterized in that at least one of the modulable light sources, in particular illumination LEDs (8) is replaced by the optical transmitter (12), preferably by an infrared diode (13).

Display according to one of the preceding claims, characterized in that in the display (1) an optoelectronic sensor is integrated, which comprises the integrated optical transmitter (12) and the optical detection of approaches, in particular of objects, or gestures in front of the display ( 1).

Display according to one of the preceding claims, characterized in that in the display (1) an optical receiver (24), preferably a receiving diode (14), under the modulatable optical filter (2) is integrated, wherein preferably at least one of the illumination LEDs (8) is replaced by the receiving diode (14).

Display according to one of the preceding claims, characterized in that a lightbox (7) is included, in which the modulatable light sources, in particular illumination LEDs (8) are arranged, wherein the lightbox (7) preferably either below the optical element (4) or laterally of the optical element (4) is arranged, so that an illumination of the optical filter (2), preferably the liquid crystal layer (3), by the optical element (4).

Display according to one of the preceding claims, characterized in that the optical element (4) is a passive element, preferably a diffuser (5).

Display according to one of the preceding claims, characterized in that the optical transmitter (12), in particular the infrared diode (13), and / or the receiving diode (14) in the optical element (4) is integrated.

Display according to one of the preceding claims, characterized in that the optical element (4) has at least one channel (16) through which the radiation emitted by the optical transmitter (12) can pass through the optical element (4) substantially uninfluenced.

Display according to one of the preceding claims, characterized in that the display (1) comprises an electronic board (1 1), in which the display drive is integrated, wherein in the electronic board (1 1) preferably also a control and evaluation for the optical transmitter (12) and / or the receiving diode (14) is integrated.

1 1. Display according to one of the preceding claims, characterized in that in the display (1) at least two optical transmitters (12) and preferably an optical receiver (24) are integrated, wherein at least one of the optical transmitters (12) is a transmitting diode (13) and

At least one of the further optical transmitters (12) is a compensation diode (17).

12. Display according to claim 1 1, characterized in that the control and evaluation a control circuit for controlling the op i tical transmitter (12), in particular the infrared diode (13), and / or the

Compensation diode (17), wherein preferably the compensation diode (17) is regulated such that the from the receiver (24) received transmission signal of the optical transmitter (12) is compensated.

15 13. A display according to claim 10, characterized in that the control and evaluation for the optical transmitter (12), in particular the infrared diode (13), and / or the optoelectronic sensor is integrated in an electronic circuit, preferably in the board (12) is integrated for display control.

20

14. Display according to one of the preceding claims, characterized in that the optical transmitter (12), in particular the infrared diode (13), and / or the compensation diode (17) and / or the optoelectronic sensors are not power-controlled.

25

15. Display according to one of the preceding claims, characterized in that the display (1) on its underside an electronic board (1 1), which is arranged below the optical transmitter (12) and an optical receiver (24), wherein at least two

30 openings in the board (1 1) are present, wherein one of the openings near the optical transmitter (12) and one near the optical receiver (24) are arranged.