DE102016005130B3 - Technique for testing a display unit - Google Patents

Abstract

The present disclosure relates to a method and apparatus for testing a display unit. A method aspect of the disclosure includes the following steps. At least one sensor device with a matrix of photodetectors is provided, the photodetector matrix having a first number of photodetectors in a first direction and a second number of photodetectors in a second direction perpendicular to the first direction. The display unit to be tested is moved relative to the at least one sensor device to detect output signals of the photodetectors. Based on the detected output signals, the display unit is checked. According to the method just described, a device is further disclosed which is adapted to carry out the method.

Description

Technical area

The present disclosure relates generally to the field of testing a display unit. Specifically, an apparatus and method for checking a display unit are provided.

background

Display units, such as (O) LED and LC displays, are used in a variety of applications and are mostly automated. For example, such display units are increasingly installed in motor vehicles.

Generally, the goal of the display unit manufacturers is to automate the manufacture of defect-free and functional display units and ensure high quality. During the manufacturing process, various factors may vary, such as the quality of the material being processed or a manufacturing sub-process where small deviations from a setpoint occur. The processing of a defective material or a faulty sub-process can lead to defects or even complete failure of the display units.

Accordingly, a great deal of care is already taken in the selection of materials in order to prevent production errors. Furthermore, the sub-processes undergo constant quality controls. In addition, the finished display units are checked before delivery. The examination is often carried out by means of a consideration and assessment by an employee. The check by an employee can be made during the presentation of a predetermined pattern on the display unit. Since the human eye has a limited resolution, certain errors can hardly or not be perceived so that such errors can go undetected.

In the publication US 2011/0221784 A1 teaches a tester connected to a pixelized display. The test device comprises a measuring unit for measuring the pixels. A measured luminance value is converted by a controller into a corresponding voltage value. Further, the luminance value is compared with a target luminance value and the voltage value of a pixel can be changed accordingly to reach the target luminance value. Accordingly, the controller is connected to an energy supplier, which in turn is connected to the display.

The publication US 6 111 424 A describes a method for detecting defective pixels by an infrared camera. The infrared camera is configured to record and analyze a thermal characteristic of the pixels in response to a corresponding electrical signal. According to a uniform electrical signal, defect-free pixels heat up uniformly and result in a uniform infrared image. Defective pixels do not heat up uniformly and reach a different temperature than the defect-free pixels, so that they can be detected by the infrared camera.

document JP 2009-47 630 A teaches a device for checking a display by means of a plurality of sensors. A transport unit transports the display in one direction with the sensors lined up along the direction. A signal generator sends signals for displaying a plurality of patterns at different positions on the display to the display.

document JP 2002-98651 A teaches a device for determining defective display elements of a display by controlling a conveying speed of the display so that the display does not move within a predetermined time period further than a size of a pixel of a sensor checking the display. The document further teaches a polarizing plate positioned between the display and the sensor.

Short outline

It is an object of the present disclosure to provide a method and apparatus for automated testing of a display unit.

According to a first aspect, a method for testing a display unit according to claim 1 is disclosed. In the method, at least one sensor device having a matrix of photodetectors is provided, the photodetector matrix having a first number of photodetectors in a first direction and a second number of photodetectors in a second direction perpendicular to the first direction. The display unit to be tested is moved relative to the at least one sensor device to detect output signals of the photodetectors. Based on the detected output signals, the display unit is checked.

The relative movement can be carried out such that either the display unit is stationary and the at least one sensor device is moved or the sensor device is stationary and the display unit is moved. The Relative movement may also include moving the sensor device and the display unit. The display unit to be tested may be moved substantially along the second direction, detecting output signals from the photodetectors. Alternatively, the display unit to be inspected may be moved substantially along the first direction or a direction between the first and second directions (that is, obliquely to the first and second directions).

The sensor device may be any optically sensitive device with photodetectors known to those skilled in the art, such as a CCD chip or a matrix of photoresistors.

The first number of photodetectors may be larger than the second number of photodetectors. The first number of photodetectors can provide a resolution of at least 1000, 1500 or 2000 dots per inch, DPI, in the first direction. The second number and / or the relative movement (possibly in combination with the read-out frequency of the photodetectors) can / ensure a resolution of at least 1000, 1500 or 2000 DPI in the second direction.

In the method, the display unit may be controlled during movement of the display unit relative to the at least one sensor device. The control of the display unit can be carried out in dependence on their movement and / or position relative to the at least one sensor device. The display unit may include a plurality of display elements, and the display elements may be driven relative to the movement and / or position of the display unit relative to the at least one sensor device.

The display elements can be pixels or area elements. Each pixel may comprise two or more subpixels. The subpixels may be configured to emit light of different wavelengths (eg, red, green, and blue light).

The display unit may comprise a display element matrix having a third number of display elements in the first direction and a fourth number of display elements in the second direction. In this case, the fourth number may be greater than the third number, or the first number may correspond to at least the third number and the second number may be smaller than the fourth number.

In addition, at least one temperature sensor device with temperature detectors can be provided. The display unit to be tested is moved relative to the at least one temperature sensor device by detecting output signals of the temperature detectors. Based on the detected output signals, the display unit is checked. The at least one temperature sensor device may include a first number of temperature detectors along the first direction and a second number of temperature detectors along the second direction. In this case, the second number of temperature detectors may be greater than the first number of temperature detectors. The first number of temperature detectors may correspond to the first number of photodetectors and the second number of temperature detectors may be less than or equal to the second number of photodetectors. The temperature detectors may be thermocouples or radiation sensors (bolometric or pyroelectric detectors).

According to a second aspect, a display unit testing apparatus according to claim 6 is disclosed. The device comprises a recording device, which is designed to receive a display unit to be tested, and a first sensor device having a first matrix of photodetectors, wherein the first photodetector matrix has a first number of photodetectors in a first direction and a second number of photodetectors in a direction perpendicular to the first direction second direction. Furthermore, the apparatus comprises a transport device which is coupled to the receiving device and / or the first sensor device in order to move the first sensor device relative to the receiving device, and a test device for testing a recorded display unit on the basis of output signals of the photodetectors.

The device may further comprise a drive device for controlling a recorded display unit as a function of its movement and / or position relative to the first sensor device. The drive device may be designed to synchronize the drive of the display unit with a speed of the transport device. Furthermore, the display unit may comprise a plurality of display elements and the control device may be configured to selectively control or not to control those first display elements of the display that are currently in the area of the first sensor device. One or more second display elements may be driven differently than the first display elements. This includes non-driving the second display elements when the first display elements are driven.

The second sensor means may comprise a second array of photodetectors, wherein the second photodetector array may comprise a third number of photodetectors in the first direction and a fourth number of photodetectors in the second direction. In particular, the third number may be greater than the fourth number. Furthermore, the second sensor device can be arranged along the second direction offset from the first sensor device. The drive device can selectively control those second display elements of the display unit, which are currently in the area of the second sensor device, differently than the first display elements (including a non-drive of the second display elements, if the first display elements Elements are controlled).

The apparatus may further comprise a third sensor means having a third array of photodetectors, wherein the third photodetector array may comprise a fifth number of photodetectors in the first direction and a sixth number of photodetectors in the second direction. In particular, the fifth number may be greater than the sixth number. The sensor device may be arranged offset along the second direction to the first and second sensor devices. The drive means may selectively drive those third display elements of the display unit which are currently in the region of the third sensor means differently than the first and / or second display elements (including non-driving of the third display elements, if the first and / or second display elements are activated).

Driving at least one of the first, second, and third display elements may include driving the display elements at predetermined voltage levels, colors, lights, shades of gray, light / dark, or other patterns, and / or predetermined drive frequencies. The driving may include a static or temporally variable driving of the display elements.

The first, second and third sensor devices can be designed to detect different light properties (eg different wavelength ranges, in particular colors). The light detectable by the sensor devices may be light in the infrared range and / or ultraviolet range and / or visible and / or polarized light. For this purpose, at least one filter may be located in front of the photodetectors of one or more of the sensor devices. The filters may include polarizing filters or color filters, but also correction or conversion filters.

The activation of the display elements in particular or the display unit in general can take place wirelessly (eg via WLAN or Bluetooth) or via at least one cable connection. For this purpose, a receiving unit located in the display unit and a transmitting unit located in the drive means can be provided. The transmission unit located in the drive device can in turn be connected to the reception unit in the display unit wirelessly or by cable.

At least the first sensor device may be a line sensor in which the second number is 1. The first number of photodetectors of at least the first sensor device may, in addition to the desired resolution, also depend on the length of the display unit to be tested and / or on an intended relative movement (eg the intended transport speed). The second and / or third sensor device can likewise each be a line sensor in which the second number is 1. The first and / or second number may be selected according to the intended relative movement of the display unit to the transport device. The first, the second and possibly the third sensor device can be designed as individual devices or as an integrated device which comprises the first, the second and possibly the third sensor device.

The receiving device may be or comprise a tray or a frame with an opening in or on which the receiving device can be placed. The receiving device may be or comprise a belt moved by the transport device, in particular an endless belt. The receiving device may alternatively not be coupled to the transport device. For example, the receiving device may be stationary. Furthermore, the transport device can be coupled to the at least one sensor device.

The transport device can be configured to move the receiving device in a direction opposite to the direction of movement after a first checking of the display unit in order to be able to recheck the display unit. The transport speeds in the direction of movement and in the direction opposite to the direction of movement can be set the same or different. Upon recheck, the display unit may be driven differently or equal by the driver.

Based on a result of the test, the display unit can be calibrated. The calibration may include a color and / or brightness calibration of the display unit to be tested. Calibration of the display unit may be done by means of the driver or otherwise.

The recording device may be designed such that a recorded display unit (ie its active side) faces a base area on which the device is arranged (eg the floor of a room). The at least first sensor device can then be arranged between the receiving device and the base. Alternatively, the display unit may be disposed between the at least one sensor device and the base.

The display unit may include a plurality of display elements, and the test device may be configured to detect display element errors. Display element errors may include a lack of driveability, an incorrectly rendered light / dark pattern, and color aberrations. The test device may additionally or alternatively also be designed to detect mechanical errors (such as inclusions and tension) of the display unit.

In addition to controlling the display elements, in particular of subpixels, with primary colors, various mixed colors can be tested, which consist of a certain ratio of the primary colors. Accordingly, the test device can check a mixed color as a detected signal of the photodetectors or the corresponding proportions of the primary colors in the mixed color in order to be able to draw conclusions on, for example, the subpixels.

The device comprises at least one illumination device for illuminating the display unit. The illumination device is designed to emit light with specific light properties (eg in the infrared wavelength range or polarized light). For this purpose, the lighting device may comprise one or more filters.

The illumination device illuminates the display unit with infrared light. The first sensor device has a sensitivity in the infrared. The test device can be designed to detect inclusions (eg air inclusions in the display stack) in the display unit based on the infrared light detected by the photodetectors. The illumination device is further configured to illuminate the display unit with polarized light. The first sensor device or the second sensor device has a sensitivity to polarized light. The test device may be configured to detect stresses in the display unit based on the polarized light detected by the photodetectors.

Furthermore, the device may comprise a cleaning device, which is designed to clean a recorded display unit, wherein the cleaning device is preferably upstream in a transport direction of the first sensor device. The cleaning device may be a compressed air device that conveys compressed air against the display unit received by the receiving device. Furthermore, the cleaning device may be a device which, in a first step, wets the display unit with a fluid and, in a second step, dries the wetted areas.

Although some of the above-described aspects have been described in relation to the method, these aspects may also apply to the design of the device. Likewise, the aspects described above with respect to the device may apply to the method in a corresponding manner.

Brief description of the drawings

Further aspects, advantages and details of the solution disclosed here will become apparent from the following description of embodiments, which are explained with reference to the figures. Show it:

1 a block diagram of a device for testing a display unit according to an embodiment;

2 a flowchart illustrating an embodiment of a method for checking a display unit;

3 a block diagram of a device for testing a display unit according to another embodiment;

4 a block diagram of a device for testing a display unit according to another embodiment;

5 a schematic diagram illustrating the control of a display unit;

6 a block diagram of a device for checking a display unit according to another embodiment.

Detailed description

In the following description, details of particular embodiments are described to provide a thorough understanding of the disclosure presented herein. It will be apparent to those skilled in the art that the present disclosure is in other embodiments can be realized, which does not realize these details.

Further, those skilled in the art will appreciate that the methods, functions, and steps presented below are provided using software code provided in combination with a processor, or using an application specific integrated circuit (ASIC) ) or a digital signal processor (DSP).

1 shows a first embodiment of a device 100 to check a display unit 102 , The device 100 includes a recording device 104 , a sensor device 106 , a testing device 108 and a transport device 110 , The recording device 104 and the transport device 110 can be integrated in a single device.

In the following description, checking of a single display unit is always performed 102 it will be apparent to those skilled in the art that, with a suitable embodiment of the recording device 104 and the transport device 110 a variety of display units 102 can be taken and automated one after the other. At the display unit 102 they can be fully or partially mounted (O) LED or LC displays. Next, the display unit 102 a plurality of display elements, such as pixels. The pixels may each consist of several subpixels emitting light of different wavelengths.

The recording device 104 is designed to receive the display unit to be tested 102 , The recording device 104 has at least one tray 104A on, in which the display unit 102 can be placed. In this case, an active surface of the display unit provided with display elements (not shown) 102 in the recorded state of the sensor device 106 facing. For this purpose, the tray 104A be formed as a frame with a central opening through which the display elements of the display unit 102 from the sensor device 106 are detectable.

Through the tray 104A can change the position of the display unit 102 regarding the recording device 104 be determined. Further, thus, a position of the display unit 102 be defined before and the at least one sensor device 106 may be appropriate to the tray 104A be aligned.

The first sensor device 106 can be designed as a CCD device. It has a first array of photodetectors, the photodetector array having a first number of photodetectors in a first direction (see arrow A in FIG 5 ) and a second number of photodetectors in a second direction perpendicular to the first direction. The second direction is indicated by the arrow B in 1 shown schematically and is parallel to a direction of movement of the recording device 104 , The direction of movement runs in the 1 and the following figures for explanatory purposes in parallel to the second direction, but the direction of movement is not limited thereto. In particular, to increase the spatial resolution of the sensor device 106 the direction of movement is oblique to the second direction (eg within an angular range of 10 ° to 80 °, in particular 30 ° to 60 °, to the second direction). The first sensor device 106 is with the testing device 108 connected and sends outputs of the photodetectors to this.

The first number of photodetectors in the first direction may be chosen to be larger than the second number of photodetectors in the second direction. Corresponding to a surface to be tested of the display unit 102 For example, it may be useful to select the first number of photodetectors so that the first number of photodetectors are beyond the maximum width of a range of the display unit 102 extending in the first direction while ensuring the desired resolution of, for example, 2000 DPI or more. The second number of photodetectors of the first sensor device 106 may be one, so the first sensor device 106 is designed as a line sensor.

At the recording facility 104 In the present exemplary embodiment, this is one of the transport device 110 moving tape, more precisely an endless tape for the automated testing of display elements 102 in a continuous process. The transport device 110 may for this purpose comprise a motor (not shown) connected to the receiving device 104 is coupled. In accordance with an applied driving torque of the motor, the tape is moved at a predetermined speed. The testing device 108 can with the transport device 110 be electrically connected and control these or receive transport-related signals from this. Furthermore, the transport device 110 be configured to set a predetermined speed. The speed can be from the test facility 108 be specified. Alternatively or additionally, the transport device 110 or another device, the transport speed or other transport-related parameter (such as the current position of the recording device 104 or the display unit 102 ) of the test facility 108 signal.

In the in 1 illustrated embodiment is the transport device 110 with the recording device 104 coupled and the sensor device 106 is stationary. The transport device 110 drives the recording device 104 such that on the receiving device 104 located display units 102 be moved in the second direction B. Alternatively, the transport device 110 with the recording device 104 and the sensor device 106 be coupled, so the transport facility 110 both the recording facility 104 as well as the sensor device 106 emotional. Moving the sensor device 106 can in the same direction of movement as the direction of movement of the recording device 104 take place, wherein the movement speed of the sensor device 106 less than or greater than the moving speed of the recording device 104 may be to one scanning the entire recording device 104 with the sensor device 106 to enable. Also, the direction of movement of the sensor device 106 opposite or orthogonal to the direction of movement of the recording device 104 be. In the in 1 illustrated embodiment, the sensor device is located 104 below the recording device 104 , Should the display unit 102 with its active side up in the recording device 104 are arranged, the sensor device 106 correspondingly above the recording device 104 arranged.

Alternatively, the recording device 104 not with the transport device 110 be coupled. Accordingly, the transport device 110 only the sensor device 106 move.

The testing device 108 is for checking the display unit 102 on the basis of the output signals of the photodetectors of the first sensor device 106 educated. The testing device 108 points to a processor 108A and a memory 108B on. The processor 108A is configured to execute a computer program for carrying out the methods presented here. The computer program can do this on the memory 108B (eg, a semiconductor memory, a magnetic or optical medium, etc.). Furthermore, in the memory 108B predetermined values or patterns for the display unit 102 and / or their display elements are stored, which can be compared with the output signals detected by the photodetectors. On the basis of the comparison of the output signals of the photodetectors with the predetermined values or patterns, the test device 108 Determine if the display unit is defective or free of defects.

2 shows a flowchart 200 a method for checking a display unit 102 , The method can be different from the one in 1 shown device 100 or another device.

In a first step 202 becomes at least one sensor device 106 provided and a display unit to be tested 102 is from the recording facility 104 added. This situation is in 1 shown.

In step 204 done by the transport facility 110 a movement of the display unit to be tested 102 relative to the first sensor device 106 , Will be the display unit to be tested 102 in the photodetectors of the sensor device 106 moving detectable area, capture the photodetectors in step 206 one signal each. The detected signal may be any type of light, for example, different wavelengths or magnitudes, through an AD converter of the test device 108 is converted into an electrical signal. The testing device 108 may be adapted to the transport device 110 , the recording facility 104 , the display unit 102 and the surrounding space. Thus, the detected signals of the sensor device 106 from the test facility 108 be filtered before further processing.

In step 208 checks the test facility 108 the display unit 102 based on the detected output signals. Checking the display unit 102 through the test facility 108 may comprise comparing the detected output signals with at least one predetermined pattern, predetermined value, for example, a predetermined wavelength or brightness, and / or comparing the detected signals of the individual display elements with each other. Based on a test result of the display unit 102 through the test facility 108 can be automated to determine if a display unit 102 deficient or defective.

In the following description, devices which have already been described in previous figures, but which have a similar or identical function in another device structure, are given the same reference numerals. The individual embodiments can be combined with each other.

3 shows a second embodiment of a device 300 to check the display unit 102 , Unlike the in 1 shown device 100 , Includes the device 300 in addition a drive device 116 ,

The driving device 116 is designed to drive the recorded display unit 102 , For example, depending on their movement and / or position relative to the sensor device 106 , The driving can be done wirelessly, for example via an NFC interface or via a wireless network.

Furthermore, the drive device 116 be designed to control the display unit 102 with a transport speed of the transport device 110 or a position of the display unit 102 (For example, with respect to the sensor device 106 ) to synchronize. The driving device 116 For this purpose, it may comprise a sensor which has a position of the display unit 102 and / or the recording device 104 (eg the tray 104A ) and / or a transport speed determined. Depending on the specific position, a synchronous control of the display unit 102 occur at one or more predetermined times. The driving by the drive device 116 may also include non-driving certain display elements (especially if other display elements are being addressed simultaneously).

A coupling for determining the position or detecting the movement of the display unit 102 can by one in the display unit 102 located NFC chip and a corresponding one of the drive device 116 covered NFC chip. The coupling is not limited to NFC chips, but can also be done by light sensors and LEDs (or other light sources), a Hall switch or otherwise. The driving device 116 is also with the testing device 108 connected and can be controlled by and / or synchronized with this.

The control of the display elements in particular or the display unit 102 in general, wireless (eg via WLAN or Bluetooth) or via at least one cable connection. The driving device 116 and the display unit 102 For this purpose, each can have a transmitting and / or receiving unit in order to enable a unidirectional or bidirectional communication.

The driving device 116 can selectively display elements of the display unit 102 control or not drive, if this in the field of sensor device 106 lie. Accordingly, it is possible the display unit 102 Under various conditions such as different voltage levels, colors, light levels, gray tones, light / dark patterns and / or predetermined Ansteuerfrequenzen to investigate.

4 shows a further embodiment of a device 400 to check the display unit 102 , The device 400 in 4 includes in addition to the in 3 illustrated devices an optional cleaning unit 114 , a second sensor device 402 and an optional lighting device 410 ,

The second sensor device 402 has a second array of photodetectors, the second photodetector array having a third number of photodetectors in the first direction and a fourth number of photodetectors in the second direction. The second sensor device 402 can be identical to the first sensor device 106 be. The second sensor device 402 is offset along the second direction to the sensor device 106 arranged. In the 4 shown sensor devices 106 . 402 , as well as further sensor devices shown later, can be combined in a single device.

It makes sense, the cleaning unit 114 in a device for checking a display unit 102 to integrate, it makes sense depending on the structure of a device, the cleaning unit 114 at one point in the transport direction in front of the sensor devices 106 . 402 to position. The cleaning unit 114 has the function of impurities on the display unit 102 to eliminate. Impurities can be a change in optical path or light characteristics (wavelength, light intensity, etc.) between the display unit 102 (or their display elements) and the sensor devices 106 . 402 cause. Accordingly, contamination may cause the inspection of the display unit 102 complicate or distort the result of the test. The cleaning unit 114 may be in one embodiment, a compressed air device, which at a predetermined pressure air against the display unit 102 promoted. Likewise, the cleaning unit 114 in a further embodiment, the display unit 102 wet with a fluid and then dry the wetted areas.

The in the 4 shown illumination device 410 is designed to be the display unit 102 to illuminate with a given type of light. The given type of light can be infrared light, ultraviolet light, polarized or visible light of a given wavelength. Display units 102 that have inclusions and / or surface damage, for example, reflect infrared light differently than display units 102 which have no inclusions and / or surface damage. The inclusions may be inclusions of gases or foreign bodies. The lighting of the display unit 102 with polarized light, on the other hand, the detection of tension in the display unit 102 because such stresses lead to a polarization change of the reflected light. Accordingly, at least one of the sensor devices 106 . 402 be adapted to detect infrared light, ultraviolet light, polarized and / or visible light of only a certain wavelength (eg via an upstream filter, including a polarizer).

The driving device 116 is formed, those display elements of the display unit 102 , which are currently in the range of photodetectors of the second sensor device 402 are to control differently than the display elements, which are currently in the range of the photodetectors of the first sensor device 106 (or have already found and have already left this area). In the 4 shown device 400 to check the display unit 102 is particularly suitable for checking light / dark errors of the display unit 102 The test can also be carried out differently, as described above. According to the position of the display elements, the drive device 116 controlling them in such a way that display elements in the area of the photodetectors of the first sensor device 106 reproduce a bright pattern and in the area of the second sensor device 402 to play a dark pattern. The testing device 108 can the display unit 102 on the basis of the output signals of the photodetectors, for example to identify faulty display elements that are always on (light) or always off (dark).

To illustrate the control of the display unit 102 through the drive device 116 is in 5 a time course of the control with a light / dark pattern is shown schematically. A movement of the display unit 102 takes place in the second direction, as shown by the arrows B. The control of the display elements of the display unit 102 through the drive device 116 is at the transport speed and / or the current position of the display unit 102 (or the recording facility 104 ) synchronized. For this purpose, the drive device 110 corresponding signals from the transport device 110 or another device.

At the time T1, the recording device is located 104 according to 5 with the recorded display unit 102 even before the photodetectors of the first sensor device 106 and the second sensor device 402 , In the present example, the display elements are in an off state. When the display unit 102 the photodetectors of the first sensor device 106 has reached or already before, controls the driving device 116 the display elements of the display unit 102 at. As in 5 shown, the display elements are above the sensor device 106 controlled so that they reflect a bright pattern.

At time T2, there are so many display elements above the first sensor device 106 in that the entire first sensor device 106 is covered with appropriately controlled display elements. Upon further movement of the display unit 102 after the time T2 controls the drive means 116 the display elements representing the area of the sensor device 106 have left so that they return to their original state or play a predetermined hue. The original state is the off state in this example.

At time T3, the display elements reach the photodetectors of the second sensor device 402 , The display elements are not redirected and the off state can be checked by a dark pattern.

Accordingly, display elements that are erroneously always on (light) or always off (dark) may be from the sensor device 402 or the sensor device 106 detected and from the test facility 108 be identified.

6 shows a further embodiment of a device 600 to check the display unit 102 , In addition to those in the 1 . 3 and 4 The apparatuses shown comprise the device 600 a third sensor device 604 , a first filter 618 , a second filter 606 , and a third filter 608 that match between the display unit 102 and the sensor devices 106 . 402 . 604 are arranged.

At the in 6 shown filters 618 . 606 and 608 each may be a polarizing filter, a correction filter, a conversation filter or a color filter. At the in 6 shown device 600 is an advantageous embodiment that each of the sensor devices 106 . 402 . 604 the capture of a single base color is assigned. Accordingly, before the first sensor device 106 a color filter 618 be arranged, which passes only red light. Before the second sensor device 402 can be a color filter 606 be arranged, which transmits blue light, and in front of the third sensor device 604 according to a color filter 608 be arranged, the green light passes. As is well known, a pixel may consist of subpixels, with one subpixel each associated with a base color. A corresponding control by the drive device 116 The display elements may overlay the Colors red, green and blue result to create a mixed hue.

The driving of the display elements by the drive means 116 can be a mixed color for all detectable areas of the photodetectors of the sensor devices 106 . 402 . 604 be. Alternatively, the drive may include that in the detectable range of the photodetectors of the sensor device 106 a red hue in the detectable area of the photodetectors of the sensor device 402 a green hue, and in the detectable range of the photodetectors of the sensor device 604 a blue hue is rendered.

Similar to the in 5 As shown, the display elements of the display unit become, for example 102 controlled such that the display elements, the area of the first sensor device 106 have reached or already before, play a red hue (for example, only the red subpixels are driven). Then, the display elements leave the area of the first sensor device 106 controlled such that they are turned off. Once the display elements the area of the second sensor device 402 reach, the display elements are driven so that the display elements play a green hue (eg, only the green subpixels are driven). If the display elements the area of the second sensor device 402 leave, these can be controlled again so that they are turned off. Accordingly, the display elements in the area of the third sensor device 604 controlled so that they reflect a blue hue (eg, only the blue subpixels are driven) and when leaving the area of the third sensor device 604 turned off.

It will be apparent to those skilled in the art that the order of patterns and colors described in the exemplary embodiments are merely examples, and the present disclosure is not limited to these.

As already mentioned, the lighting device 410 be arranged to the display unit 102 to illuminate with a predetermined type of light. If the type of light is infrared light, the test device is 108 configured on the basis of the detected output signals of at least one of the sensor devices 106 . 402 . 604 Inclusions in the display unit 102 to identify. Will the display unit 102 illuminated with polarized light, is the testing device 108 configured on the basis of the detected output signals of at least one of the sensor devices 106 . 402 . 604 Tension in the display unit 102 to identify.

Further, in a device for checking a display unit 102 be advantageous if in addition at least one lens in the optical path between the display elements and the at least one sensor means 106 . 402 . 604 is arranged. The at least one lens can for this purpose in the at least one sensor device 106 . 402 . 604 be arranged. Alternatively or additionally, at least one lens may be provided in front of the display elements of the display unit 102 be positioned before it is tested.

In the described embodiments, the display units 102 only once via the sensor devices 106 . 402 . 704 and the present disclosure is not limited to a single check. The transport device 110 may be adapted to the recording device 104 after first checking the display unit 102 to move in a direction opposite to the direction of movement to the display unit 102 again through the sensor devices 106 . 402 . 604 to be able to check. The moving speed in the moving direction and in the direction opposite to the moving direction may be set equal to or at a predetermined ratio. Such reciprocation allows testing of different voltage levels, colors, light levels, shades of gray, light / dark or other patterns with a single sensor device.

Furthermore, the display unit to be tested 102 be calibrated based on a result of the test. The calibration may be a color and / or brightness calibration of the display unit to be tested 102 include. The calibration can be done by means of the drive device 116 (which for this purpose with the testing device 108 communicates) or otherwise. Next, by a multiple test the same display unit 102 determine whether the color and / or brightness calibration of the display unit 102 was successful and the display unit 102 represents a predetermined hue and / or a predetermined brightness.

In addition to the described sensor devices 106 . 402 . 704 At least one temperature sensor device can be provided. The temperature sensor device may be before, between or after the sensor devices 106 . 402 . 704 be arranged along the direction of movement or in an overall unit together with the sensor devices 106 . 402 . 704 be arranged. The temperature sensor device has a first number of temperature detectors in the first direction and a second number of temperature detectors in the second direction. In one possible embodiment, the second number of temperature detectors is selected such that the total width of the second number of temperature detectors corresponds to the width of the display unit to be tested in the second direction.

The display unit 102 becomes relative to the temperature sensor means detecting output signals of the temperature detectors by the transport means 110 emotional. The temperature sensor device detects thermal radiation of the individual display elements and outputs a corresponding output signal to the test device 108 out. Thus, it can be checked whether the display unit, for example, when driving the display elements with the same hue, produces a homogeneous image of the heat radiation. Next can in the memory 1086 the test facility 108 a value table may be stored in which a temperature value is assigned to a voltage level and / or hue, so that the test device 108 the output signals of the sensor devices 106 . 402 . 704 can compare with the output signals of the temperature sensor device. The temperature sensor device may be thermocouples or radiation sensors (bolometric or pyroelectric detectors).

Claims (21)

Procedure ( 200 ) for checking a display unit ( 102 ), the process ( 200 ) comprises: providing ( 202 ) at least one first sensor device ( 106 . 402 . 604 comprising a matrix of photodetectors, the photodetector array having a first number of photodetectors in a first direction (A) and a second number of photodetectors in a second direction (B) perpendicular to the first direction (A); Move ( 204 ) of a display unit to be tested ( 102 ) relative to the at least one first sensor device ( 106 . 402 . 604 ) under acquisition ( 206 ) of outputs of the photodetectors; Check ( 208 ) the display unit based on the detected output signals; Illuminate the display unit ( 102 ) with infrared light, wherein the first sensor device ( 106 ) has a sensitivity in the infrared; and / or illuminating the display unit ( 102 ) with polarized light, wherein the first or a second sensor device ( 106 . 402 ) has a sensitivity to polarized light. Procedure ( 200 ) according to claim 1, further comprising driving the display unit ( 102 ) while moving the display unit ( 102 ) relative to the at least one first sensor device ( 106 . 402 . 604 ). Procedure ( 200 ) according to claim 2, wherein the driving of the display unit ( 102 ) in dependence on their movement and / or position relative to the at least one first sensor device ( 106 . 402 . 604 ) he follows. Procedure ( 200 ) according to claim 3, wherein the display unit ( 102 ) comprises a plurality of display elements, and wherein the display elements in dependence on the movement and / or position of the display unit relative to the at least one first sensor device ( 106 . 402 . 604 ). Procedure ( 200 ) according to any one of the preceding claims, wherein the display unit ( 102 ) comprises a display element matrix having a third number of display elements in the first direction and a fourth number of display elements in the second direction. Contraption ( 100 . 300 . 400 . 600 ) for checking display units ( 102 ), the device ( 100 . 300 . 400 . 600 ) comprises: a recording device ( 104 ) used to hold a display unit to be tested ( 102 ) is trained; at least one first sensor device ( 106 a first array of photodetectors, the first photodetector array having a first number of photodetectors in a first direction (A) and a second number of photodetectors in a second direction (B) perpendicular to the first direction (A); a transport device ( 110 ) associated with the recording facility ( 104 ) and / or the first sensor device ( 106 ) is coupled to the first sensor device ( 106 ) relative to the recording device ( 104 ) to move; a testing device ( 108 ) for checking a recorded display unit ( 102 ) based on outputs of the photodetectors; at least one illumination device ( 410 ) to illuminate the display unit ( 102 ) is formed with infrared light, wherein the first sensor device ( 106 ) has a sensitivity in the infrared; and / or wherein the illumination device ( 410 ) is adapted to the display unit ( 102 ) with polarized light, the first sensor device ( 106 ) or a second sensor device ( 402 ) has a sensitivity to polarized light. Contraption ( 100 . 300 . 400 . 600 ) according to claim 6, further comprising a drive device ( 116 ) for controlling a recorded display unit ( 102 ) in dependence on their movement and / or position relative to the first sensor device ( 106 ). Contraption ( 100 . 300 . 400 . 600 ) according to claim 7, wherein the drive device ( 116 ) educated is, the control of the display unit ( 102 ) with a transport speed of the transport device ( 110 ) to synchronize. Contraption ( 100 . 300 . 400 . 600 ) according to claim 7 or 8, wherein the display unit ( 102 ) comprises a plurality of display elements and the drive device ( 116 ) is formed, selectively those first display elements of the display unit ( 102 ) or not to control, which just in the area of the first sensor device ( 106 ) lie. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 9, further comprising the second sensor device ( 402 ) with a second array of photodetectors, the second photodetector array having a third number of photodetectors in the first direction (A) and a fourth number of photodetectors in the second direction (B), in particular the third number being greater than that fourth number, and wherein the second sensor device ( 402 ) along the second direction (B) offset to the first sensor device ( 106 ) is arranged. Contraption ( 100 . 300 . 400 . 600 ) according to claims 9 and 10, wherein the drive device ( 116 ) is formed, selectively those second display elements of the display unit ( 102 ), which are currently in the area of the second sensor device ( 402 ) are to control differently than the first display elements. Contraption ( 100 . 300 . 400 . 600 ) according to claim 10 or a combination of claims 10 and 11, further comprising a third sensor device ( 604 ) with a third array of photodetectors, the third photodetector array having a fifth number of photodetectors in the first direction (A) and a sixth number of photodetectors in the second direction (B), in particular the fifth number being greater than that sixth number, and wherein the third sensor device ( 604 ) along the second direction (B) offset to the first and second sensor devices ( 106 . 402 ) is arranged. Contraption ( 100 . 300 . 400 . 600 ) according to claim 12, wherein the first, second and third sensor devices ( 106 . 402 . 604 ) are designed to detect different light properties. Contraption ( 100 . 300 . 400 . 600 ) according to claim 12 or 13 in combination with claim 11, wherein the drive device ( 116 ) is formed, selectively those third display elements of the display unit ( 102 ), which are currently in the area of the third sensor device ( 604 ) are to control differently than the first display elements and the second display elements. Contraption ( 100 . 300 . 400 . 600 ) according to claim 14, wherein the drive device ( 116 ) Is designed to control the first, second and third display elements such that they are controlled differently. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 15, wherein at least the first sensor device ( 106 ) is a line sensor in which the second number is 1. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 16, wherein the receiving device ( 104 ) one of the transport device ( 110 ) comprises moving tape. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 17, wherein at least the first sensor device ( 106 ) with the transport device ( 110 ) is coupled. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 18, wherein the receiving device ( 104 ) is formed such that a recorded display unit faces a base on which the device is arranged, wherein at least the first sensor device ( 106 ) between the recording device ( 104 ) and the base is arranged. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 19, wherein the display unit ( 102 ) comprises a plurality of display elements and the test device ( 108 ) is adapted to detect display element errors. Contraption ( 100 . 300 . 400 . 600 ) according to one of claims 6 to 20, further comprising a cleaning device ( 114 ) used to clean a recorded display unit ( 102 ), wherein the cleaning device ( 114 ) in a transport direction of the first sensor device ( 106 ) is upstream.

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