DE102021114563B4 - Displaying an image - Google Patents

Abstract

Method for displaying an image (5) by means of a display device (1) which has a display surface (3) and a layer (4) which is arranged on the display surface (3), wherein
- a fault (9) in layer (4) is located and a blocked sub-area of the display surface (3) is determined, wherein the fault (9) lies within the blocked sub-area; and
- the image (5), which has an image element (6a), is displayed on the display area (3), wherein the image element (6a) is displayed completely outside the locked sub-area, wherein
- a test image (8) is displayed on the display surface (3), which shines through the layer (4); and
- an effect of the defect (9) on the translucent test image (8) is determined and the defect (9) is localized depending on the effect of the defect (9) on the translucent test image (8), characterized in that it is determined that a key figure for the effect of the defect (9) is greater than or equal to a predetermined first threshold value, wherein the blocked sub-area is determined only for defects (9) and the image element (6a) is accordingly displayed specifically outside the blocked sub-area if the key figure is greater than or equal to the first threshold value.

Description

The present invention relates to a method for displaying an image by means of a display device comprising a display surface and a layer arranged on the display surface.

When displaying images, for example in the interior of motor vehicles, translucent layers can be used as decorative elements on the screen surfaces. This way, when the display is off, the viewer only sees the decorative application and the black surface of the screen itself is not visible. These translucent layers can be printed and/or perforated films, or natural materials such as wood, fabric, or leather, which can be made sufficiently thin to achieve adequate translucency.

One disadvantage is that the appearance of the displayed image is affected by the translucent layer when the image is activated, particularly by irregularities in the translucent layer. These irregularities may be desirable, as with printed patterns, or unavoidable in the case of natural materials such as wood, fabric, or leather. With natural materials, this could be due to knots in the wood, knots in the woven fabric, or scars in the leather. These irregularities or imperfections can impair the visibility of the displayed image or create an inhomogeneous overall impression, which is undesirable for the viewer.

document DE 10 2019 213 605 A1 This describes a generic display with a real wood veneer cover. The real wood veneer can be protected against damage by a protective lacquer or similar coating. A correction device is mentioned that corrects the display of an electro-optical indicator so that the grain of the real wood veneer is not or barely perceptible, thus preventing potential optical interference. Correction values can be pre-stored in memory for this purpose. A possible application is a symbol display for a motorist.

document DE 10 2018 221 121 A1 This describes a vehicle where, for example, based on the position of the driver's seat relative to the steering wheel, an area on the vehicle's dashboard is determined that is obscured by the steering wheel. Based on this, the output position of an image displayed on a dashboard screen can be adjusted.

Writing US 2015 / 0 193 074 A1 reveals the optical detection of defects on a touch-sensitive screen.

It is an object of the present invention to reduce the influence of defects in the layer on the image to be displayed when using a layer on a display surface.

This problem is solved by the subject matter of the independent claim. Advantageous further developments and preferred embodiments are the subject matter of the dependent claims.

The invention is based on the idea of locating a defect in the layer, accordingly determining a blocked sub-area of the display surface and selectively displaying a picture element completely outside the blocked sub-area, in particular adapting the display of the picture element to the defect accordingly.

According to one aspect of the invention, a method for displaying an image by means of a display device, in particular a display device of a motor vehicle, is described. The display device has a display surface and a layer, in particular a translucent layer, which is arranged on the display surface. A defect in the layer is located, and depending on the result of the localization, a blocked sub-area of the display surface is determined or defined. The defect lies within the blocked sub-area, in particular entirely within the blocked sub-area. The image to be displayed has at least one image element and is displayed on the display surface by means of the display device, in particular controlled by a control unit of the display device, such that the image element is displayed completely outside the blocked sub-area.

The display device can, for example, include a screen, and the display area can be a portion of the screen. The screen, which can also be called a display or similar, can be, for example, an LCD display, LED display, microLED display, or OLED display. Alternatively, the display device can also include a projection unit designed to project the image onto the display area.

The layer can be, for example, a film, particularly a decorative film, such as a plastic film. Alternatively, the layer can contain or consist of a natural material, such as wood or leather, or a natural or artificial fabric or textile material. The layer can be applied directly to the screen's display surface, for example, by being glued to it. Alternatively, the display device can have one or more additional layers, such as adhesive layers, foam layers, intermediate layers, a bezel, or the like, arranged on the screen's display surface, and to which the layer is then attached, for example, by being glued. In other words, one or more additional layers can be arranged between the layer containing the defect and the display surface.

The layer is designed, in particular, as a translucent layer and is configured, especially with regard to its thickness and/or structure, such that the image displayed on the screen's display surface shines at least partially through the translucent layer, allowing a viewer looking at the translucent layer from the side facing away from the display surface to perceive the transmitted image. The translucency can be quantified, for example, by the transmittance of the translucent layer, for instance, within a specific wavelength range of light. The transmittance is specifically adapted to the display device and the image being displayed in such a way that, for a given brightness of the image, it allows for a corresponding degree of visibility of the transmitted image.

Locating a defect can involve determining its position within the layer and/or its extent, size, and/or shape. In other words, locating a defect involves identifying a sub-area of the layer corresponding to the defect. Accordingly, the result of the localization can include the position, shape, extent, and/or size of the defect and/or any other description of the area within the layer occupied by the defect. Since the layer is fixed relative to the screen's display area, the result of the localization also defines a corresponding sub-area on the screen's display area that is specifically covered by the defect. Therefore, based on the result of the localization, the blocked sub-area can be determined. The blocked sub-area can be larger than the area covered by the defect, meaning the defect is located within the blocked sub-area in this sense. The blocked area can also correspond, within appropriate tolerances, to the area of the display surface covered by the defect. The blocked area can correspond to exactly one pixel or to any number of contiguous pixels.

A defect can be defined as such, for example, by its greater impact on the transmitted image than a predefined tolerance allows. This can be expressed, for instance, as a measurable parameter such as the brightness, intensity, color, etc., of the transmitted image at the location of the defect. Accordingly, locating the defect can be synonymous with identifying it as such.

The fault can be located, for example, using a calibration device, which is specifically not part of the display device. The calibration device includes, in particular, a sensor system and a processing unit to determine and evaluate one or more of the measured variables in order to identify and locate the fault.

Depending on the embodiment, a translucent test image can be measured, or the defect can be located by directly measuring the layer without using a translucent test image. For example, the defect may be distinguishable from the rest of the layer by dark areas or areas with structural deviations. The defect may be caused by material irregularities, natural or artificial grain patterns, damage, defects, and so on within the layer.

Alternatively, the fault location can also be located by retrieving a stored data set for the layer that specifies the position, extent, size and/or shape of the fault.

The image can be any static or dynamically changing visual content. In particular, the image can include one or more camera images, graphics, pictograms, logos, and so on. The image element can be understood as a static or dynamic object within a portion of the image. Generally, the image contains several image elements that can be distributed across the screen's display area. If the image element contains a dynamic object, it will permanently displayed outside, and in particular completely outside, the restricted area.

During operation of the display device, the image content may change in such a way that the interference no longer impairs or significantly impairs the image element. In this case, the display of the image element can be changed again.

By defining the blocked area and displaying the image element entirely outside this area, the influence of the defect on the image, particularly on the image element itself, is reduced or ideally completely compensated. This prevents the viewer from receiving a poor-quality or illegible display. Furthermore, the invention allows the use of layers that exhibit corresponding defects, leading to a reduced reject rate, especially with natural materials. The defect can also result from a deliberate modification of the layer, for example, by applying a specific structure, pattern, logo, or similar feature to the layer, which effectively constitutes a defect as described. This enables more customized layer design.

Locating defects by measuring the layer can be done individually for each specific layer of a particular display device. This can be advantageous, for example, when using natural materials where the defect's position is generally unpredictable. Alternatively, the measurement can be performed in advance for a specific type of layer, and the aforementioned data set, which specifies the position, extent, size, and/or shape of the defect, can be stored for a large number of layers. This can be advantageous, for example, if the position, extent, size, and/or shape of the defect are identical or substantially identical for different copies of the layer, such as when using artificial layers with patterned prints, logos, and so on. In this case, the measurement is performed only once during the development phase.

The process can also be viewed as a calibration procedure, performed after or at the end of the production of the display device or vehicle, for example, as a one-time procedure. In this way, the exact position of the image element on the display surface can be adaptively adjusted to the boundary conditions defined by the layer. Various options are available for adjusting and displaying the image element completely outside the restricted area.

For example, the position of the image element, or the entire image including the image element, can be moved on the display area depending on the locked area. The size or shape of the image element, and so on, can also be changed to ensure that the image element is displayed completely outside the locked area.

According to the invention, a test image is displayed on the display surface, particularly by means of the display device, which shines through the layer, which in such embodiments is designed as a translucent layer. The effect of the defect on the translucent test image is determined, particularly by means of the calibration device, and the defect is located depending on its effect on the translucent test image.

The effect of a defect on the translucent test image can be quantified, for example, by the deviation of a corresponding measured value determined by the calibration device, such as brightness, intensity, color, etc., of the translucent test image, particularly by a deviation of the measured quantity from a predetermined target value. To locate the defect based on its effect on the translucent test image, the effect can be compared to a target value. The target value can be defined by a predetermined homogeneity or similar characteristic, or by a reference image that, for example, was previously measured on the display surface without the coating, or is predetermined or known in advance. The effect of the defect can be determined by the deviation of the translucent test image from the reference image. For example, the defect can be identified as such if a characteristic value of its effect on the translucent test image is greater than or equal to a corresponding minimum value.

According to at least one embodiment, the image content of the image element is examined and it is determined that a relevant disturbance of the image element by the disturbance point would be expected if the image element were not displayed completely outside the blocked partial area on the display surface.

This avoids unnecessary image adjustments. What constitutes a relevant disturbance is determined by the specific application. For example, a disturbance can significantly impair image content with high spatial information density, such as a navigation system map, preventing the display from adequately fulfilling its informational function. In the case of image content serving a decorative purpose, such as a monochrome area, the same disturbance may only have a non-relevant impact. Similarly, the image element may contain text or other elements that do not fill the entire image. In this case, the disturbance may coincide with the image element but not affect the text or other elements. Therefore, display adjustments can be avoided.

According to at least one embodiment, the effect of the defect includes a deviation of the brightness and/or color of the translucent test image from a target specification, and the defect is located depending on the deviation of the brightness and/or color of the translucent test image from the target specification.

According to at least one embodiment, the translucent test image is measured by means of an optical sensor of the calibration device and the effect of the defect on the translucent test image is determined, in particular by means of the computing unit of the calibration device, based on a result of the measurement.

The optical sensor can detect the brightness or intensity of the light emitted by the transmitted test image. Optionally, the optical sensor can be configured for wavelength-dependent, and therefore spectroscopic, measurement of the transmitted test image.

According to at least one embodiment, the translucent test image is recorded by means of a camera of the calibration device and the effect of the defect on the translucent test image is determined, in particular by means of the computing unit of the calibration device, based on the recorded translucent test image.

The processing unit of the calibration device can analyze the captured translucent test image with respect to a previously captured reference image, which, for example, was captured without the layer being positioned on the display surface. However, referencing such a reference image is not strictly necessary. The processing unit can also analyze the captured translucent test image independently of such a reference image with regard to homogeneity, brightness, color, or other target specifications relating to the measured parameters.

According to the invention, it is determined, in particular by means of the computing unit of the calibration device, that a characteristic value for the effect of the defect on the translucent test image is greater than or equal to a predetermined first threshold value.

The blocked area is defined only for defects, and the image element is displayed accordingly outside the blocked area if the indicator value is greater than or equal to the first threshold. This prevents unnecessary shifting or adjustment of the image or image element, even if sufficient visibility or display quality is otherwise present.

According to at least one embodiment, the effect of a further defect on the transmitted test image is determined, particularly by means of the calibration device, and the further defect is located depending on its effect on the transmitted test image. It is determined, particularly by means of the processing unit of the calibration device, that a characteristic value for the effect of the further defect is less than the first threshold and greater than or equal to a predetermined second threshold. The image is displayed, particularly by means of the control unit of the display device, depending on the result of the localization of the further defect, particularly to reduce or compensate for the effect of the further defect on the transmitted test image.

For this purpose, the control unit adjusts the corresponding control signals for displaying the image on the display surface according to the position, size, and/or extent of the additional defect, in order to reduce or compensate for its effect. For example, the brightness or color of the displayed image can be changed in the area of the additional defect, so that the desired result is achieved by the effect of the additional defect when the image shines through the layer.

Accordingly, the image element or any other image element of the image will not be additionally moved or resized and/or The shape was changed to accommodate the additional point of disruption.

The second threshold is lower than the first threshold and higher than zero. This means that for defects whose impact value lies between the first and second thresholds, the defect's effect is reduced or compensated for by a correspondingly adjusted display. For defects whose impact value is higher than the first threshold, a corresponding blocked area is defined, and the image element is displayed outside this blocked area. For defects with an impact value lower than the second threshold, for example, no image adjustment can be implemented. To determine the impact of the subsequent defect on the translucent test image, the corresponding methods described for each defect can be used.

In such embodiments, it is advantageous to differentiate between various defects with varying degrees of impact on the image or test image, so that the resulting appearance does not have to be altered too drastically.

According to at least one embodiment, the layer is arranged on a further display surface of another screen of the calibration device, particularly before the layer is arranged on the display surface of the screen of the display device. A test image is displayed on the further display surface by means of the calibration device, which is translucent through the layer. The effect of the defect on the translucent test image is determined by means of the calibration device, and the defect is located depending on its effect on the translucent test image. The layer is removed from the further display surface, particularly after the defect has been located, and arranged on the display surface of the screen of the display device.

To determine the effect of the defect and to locate the defect, reference is made to the corresponding possibilities and explanations described for embodiments in which the layer is already arranged on the display surface of the screen of the display device when generating the test image and when locating the defect.

According to at least one embodiment, a target value, which is stored in particular on a memory element of the control unit of the display device, concerning the position of the image element on the display surface is modified depending on the blocked sub-area, in particular by means of the control unit and/or the processing unit of the calibration device. The image is displayed on the display surface according to the modified target value, in particular by means of the control unit.

The storage element can, for example, initially contain a target position for the image element, according to which the image element would not be displayed completely outside the locked area. By changing the target position, the image element is thus digitally shifted to ensure that it is displayed completely outside the locked area.

In alternative embodiments, the target specification relates to the shape and/or size of the image element on the display area. A combination is also possible, so that the target specification generally relates to the position and/or shape and/or size of the image element.

According to at least one embodiment, an initial image element is divided into the image element and at least one further image element, depending on the blocked sub-area, in particular by means of the control unit and/or the processing unit of the calibration device. The position and/or shape and/or size of the image element is determined during the division such that the image element is displayed completely outside the blocked sub-area.

In particular, an initial description of the initial image element is stored on the control unit's memory element. Splitting the initial image element then corresponds specifically to generating a corresponding description of the image element and at least one further image element based on the description of the initial image element and the locked sub-area.

By dividing the image element, it is possible to react particularly flexibly to the disturbance, especially if a shift and/or shape adjustment of the initial image element is insufficient or inadequate to counteract the disturbance.

According to a further aspect of the invention, a calibration method for a display device, in particular of a motor vehicle, is also specified, wherein the display device has a display surface, for example a screen with the display surface, and a layer which is applied to the display area. For the calibration procedure, a defect in the layer is located using the calibration device and a blocked sub-area of the display area is determined, whereby the defect lies within the blocked sub-area.

Further embodiments of the calibration method according to the invention result from the various configurations of the inventive method for displaying an image by means of a display device and vice versa.

According to a further aspect of the invention, a method for operating a display device with a screen and a layer arranged on a display surface of the screen is also described. In this method, a calibration procedure according to the invention is carried out, and an image comprising at least one image element is displayed on the display surface, wherein the image element is displayed completely outside the blocked area.

According to a further aspect of the invention, a display device, particularly for a motor vehicle, is also specified, comprising a screen and a layer arranged on a display surface of the screen. The display device was calibrated using a calibration method according to the invention.

According to another aspect of the invention, a motor vehicle with a display device according to the invention is also specified.

• 1 eine schematische Darstellung einer Anzeigevorrichtung;
• 2 ein Ablaufdiagramm einer beispielhaften Ausführungsform eines erfindungsgemäßen Verfahrens zum Anzeigen eines Bildes mittels einer Anzeigevorrichtung;
• 3 eine schematische Visualisierung eines Schrittes einer weiteren beispielhaften Ausführungsform eines erfindungsgemäßen Verfahrens; und
• 4 eine schematische Visualisierung eines weiteren Schrittes einer weiteren beispielhaften Ausführungsform eines erfindungsgemäßen Verfahrens.

The following describes exemplary embodiments of the invention. To this end, we will show:

• 1 a schematic representation of a display device;
• 2 a flowchart of an exemplary embodiment of a method according to the invention for displaying an image by means of a display device;
• 3 a schematic visualization of a step of a further exemplary embodiment of a method according to the invention; and
• 4 a schematic visualization of a further step of another exemplary embodiment of a method according to the invention.

The embodiments described below are preferred embodiments of the invention. In these embodiments, the described components each represent individual features of the invention that can be considered independently of one another. Each of these features further develops the invention independently and can therefore be considered part of the invention individually or in a combination other than that shown. Furthermore, the described embodiments can also be supplemented by other features of the invention already described.

In the figures, functionally identical elements are each provided with the same reference symbols.

In 1 A schematic diagram shows a display device 1, for example, of a motor vehicle (not shown). The display device 1 includes a screen 2 with a display area 3. The screen 2 can, for example, be installed in the dashboard of the motor vehicle, with a translucent layer 4, for example, a decorative element, i.e., a layer that is at least partially transparent, arranged in front of the screen 2, particularly on the display area 3. An image 5 can therefore be generated on the display area 3 and shine through the translucent layer 4, so that it is visible through the translucent layer 4 and effectively displayed on it. When the screen 2 is switched off, it can be covered by the translucent layer 4, thus enabling seamless integration of the display device 1 into the interior design of the motor vehicle.

In general, the image 5 contains one or more objects or image elements 6a, 6b, 6c, which can display various information or design elements to a viewer, for example.

A defect 9 is located in the translucent layer 4, for example, caused by a material irregularity in the translucent layer 4, a material defect, or the like. The image 5 is displayed on the display surface 3 in such a way that the image element 6a is not covered by the defect 9; that is, the defect 9 lies neither partially nor completely over the image element 6a. In other words, the image element 6a is displayed completely outside any area of the display surface 3 covered by the defect 9.

To achieve this, a method according to the invention for displaying an image using the display device 1 is carried out. 2 A schematic flowchart of such a procedure is shown.

In steps S1 to S3 of the procedure, the defect 9 is located using a calibration device (not shown). In step S4, a A blocked sub-area of the display area 3 is defined, which completely contains the defect 9. The defect 9 is therefore entirely within the blocked sub-area. The blocked sub-area can correspond to the area of the display area 3 that is covered by the defect 9, or it can be larger than this. In step S5, image 5 is then generated so that the image element 6a is displayed on the display area in such a way that it lies entirely outside the blocked sub-area.

In various embodiments, for example, a test image 8 (see 3 and 4 The image is displayed on the display surface 3, which shines through the translucent layer 4. In step S2, the calibration device can be used to determine the effect of the defect 9 on the translucent test image 8 in order to locate the defect 9. For this purpose, the calibration device can, for example, include an optical sensor or a camera to measure or record the translucent test image 8 and a processing unit to analyze the measurement result or the recorded test image 8 against corresponding target specifications in order to determine where the defect 9 is located and how strong its effect is, for example, on the brightness and/or color of the translucent test image 8.

In step S3, the calibration device's processing unit can check whether a characteristic value for the impact of fault 9 is greater than or equal to a predefined threshold. If so, fault 9 can be identified as a severe fault, and the blocked sub-area can be determined as described. If the characteristic value is less than the threshold, fault 9 can be ignored, or its impact can be reduced or compensated for using control engineering methods.

In the characters 3 and 4 Two examples are shown of how the display of image element 6a can be implemented completely outside the locked area. In the example of the 3 The position of image element 6a is shifted relative to an initial target position. Depending on the embodiment or the displayed image 5, this shift can be performed by shifting only image element 6a, the entire image 5, or individual groups of image elements 6a, 6b, 6c. The shifting of different image elements 6a, 6b, 6c does not necessarily have to be uniform. A group of image elements 6a, 6b, 6c can also be divided and shifted independently of each other to achieve the desired effect.

In the example of the 4 For example, image element 6a is not moved, but instead its shape or size is changed or limited, so that image element 6a is displayed outside the locked sub-area.

As described, particularly with reference to the figures, the invention can improve the display of an image on a display surface on which a layer with a defect is arranged by making the displayed image less affected by the defect or no longer affected by the defect.

Various embodiments can be used to implement an adaptive display device with individually blocked areas. The display area of a screen is defined, in particular, by the corresponding pixels of the screen in the horizontal and vertical directions, i.e., specifically by the screen's resolution. Appropriate content can be displayed on this area. This content consists, in particular, of images, which can also be referred to as frames, that are refreshed at defined intervals and generally encompass all actively usable pixels of the display area.

For example, in the automotive sector, such displays can be concealed behind decorative materials; these are also referred to as hidden displays. When the display is switched off, a user only sees the decorative application and the deactivated display itself; in particular, the surface of the deactivated display is no longer visible. The decorative application can be a printed and possibly perforated film with a printed pattern that blends into the surroundings. Other materials are also possible, such as natural materials like textiles, leather, or wood.

The decorative application generally impairs the appearance of the display. In principle, a more legible and higher-quality appearance can be achieved by appropriately adjusting the display's control. However, this is not always easily accomplished with satisfactory results, especially when using natural materials. Knots in wood, knots in woven fabric, or scars on leather, for example, can significantly impair the uniform appearance or legibility. To avoid rejects, it is advantageous to also use materials with such defects. However, the location and size of these defects are usually unpredictable.

According to the invention, for example, areas that are unfavorable or unusable due to a defect can be blocked and therefore not used for display. These areas can consist of individual pixels or a number of contiguous pixels. The displayed image consists, for example, of individual building blocks or individual image elements that can be moved relative to each other and arranged accordingly around the blocked portion of the display area. Moving the entire image is also possible. However, it is also possible to forgo moving the image and instead restrict the display area or change the shape of the image elements. Combinations of these options are also possible.

In particular, individual image elements can be moved, groups of related image elements can be moved, or the entire image content can be moved. Alternatively or additionally, individual image elements can be limited in their shape or size, or groups of image elements can be limited in their shape and/or size. Alternatively or additionally, image elements or groups of image elements can be split and partially moved and/or limited.

According to the invention, it is not necessary to proceed in the same or analogous manner with all interference points. For example, it may be necessary to display image content at a specific location even though it is affected by another interference point because, for aesthetic or functional reasons, or due to the limited total available space, no further shifting or adjustment is possible or desired. Thus, a compromise may have to be made between the interference with the intended display of the image content and the display quality.

In various embodiments, the image display in a portion of the display area or on another display area of a separate display device, which is not affected by the defect, can also be adapted to the display of the image element affected by the defect. For example, if an image element is displayed in an adapted manner due to the defect, a corresponding image element or an image element with identical content at another location can also be displayed in an adapted manner to ensure a harmonized overall display. For example, this can enable a harmonious display on different display devices of the same vehicle.

Reference symbol list

1

Display device

2

Screen

3

Display area

4

layer

5

Picture

6a, 6b, 6c

Image elements

8

Test pattern

9

Fault point

S1 to S5

Procedural steps

Claims (8)

Method for displaying an image (5) by means of a display device (1) comprising a display surface (3) and a layer (4) arranged on the display surface (3), wherein: - a defect (9) of the layer (4) is localized and a blocked sub-area of the display surface (3) is determined, wherein the defect (9) lies within the blocked sub-area; and - the image (5), comprising a picture element (6a), is displayed on the display surface (3), wherein the picture element (6a) is displayed completely outside the blocked sub-area, and wherein - a test image (8) is displayed on the display surface (3), which is visible through the layer (4); and - an effect of the defect (9) on the translucent test image (8) is determined and the defect (9) is localized depending on the effect of the defect (9) on the translucent test image (8), characterized in that it is determined that a key figure for the effect of the defect (9) is greater than or equal to a predetermined first threshold value, wherein the blocked sub-area is determined only for defects (9) and the image element (6a) is accordingly displayed specifically outside the blocked sub-area if the key figure is greater than or equal to the first threshold value. Procedure according to Claim 1 , characterized in that the effect of the defect (9) includes a deviation of the brightness and/or color of the translucent test image (8) from a target specification and the defect (9) is localized depending on the deviation of the brightness and/or color. Procedure according to one of the Claims 1 or 2 , characterized in that - the translucent test image (8) is measured by means of an optical sensor and the effect of the defect (9) on the translucent The test image (8) is determined based on a measurement result; or - the translucent test image (8) is recorded using a camera and the effect of the defect (9) on the translucent test image (8) is determined based on the recorded translucent test image (8). A method according to one of the preceding claims, characterized in that : - the effect of a further defect on the translucent test image (8) is determined and the further defect is localized depending on the effect of the further defect on the translucent test image (8); - it is determined that a characteristic value for the effect of the further defect is less than a predetermined first threshold and greater than or equal to a predetermined second threshold; and - the image (5) is displayed depending on a result of the localization of the further defect. Procedure according to Claim 1 , characterized in that - the layer (4) is arranged on a further display surface; - a test image is displayed on the further display surface, which shines through the layer (4); and - an effect of the defect (9) on the translucent test image (8) is determined and the defect (9) is located depending on the effect of the defect (9) on the translucent test image (8); and - the layer (4) is removed from the further display surface and arranged on the display surface (3). Method according to one of the preceding claims, characterized in that - a target specification regarding a position of the image element (6a) is changed depending on the blocked partial area; and - the image (5) is displayed on the display surface (3) according to the changed target specification. Procedure according to one of the Claims 1 until 5 , characterized in that - a target specification regarding a shape and/or a size of the image element (6a) is changed depending on the locked sub-area; and - the image (5) is displayed on the display area (3) according to the changed target specification. Procedure according to one of the Claims 1 until 5 , characterized in that - an initial image element is divided into the image element (6a) and at least one further image element (6a) depending on the locked sub-area; and - a position and/or a shape and/or a size of the image element (6a) is determined during the division in such a way that the image element (6a) is displayed completely outside the locked sub-area.