CN111735609A

CN111735609A - Demura detection method and device for display screen

Info

Publication number: CN111735609A
Application number: CN202010506436.3A
Authority: CN
Inventors: 袁小虎; 陈滔
Original assignee: Shenzhen Tech Sen Automation Equipment Co ltd
Current assignee: Shenzhen Tech Sen Automation Equipment Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-10-02

Abstract

The invention provides a Demura detection method and a device of a display screen, when a detection lens cannot directly acquire the image on the curved surface side of the display screen to be detected, a prism unit is arranged corresponding to the position of the curved surface side, the transmission of light is changed by the prism unit, and the actual display picture on the curved surface side is sent to the detection lens. The demura detection of the whole display screen to be detected can be effectively realized.

Description

Demura detection method and device for display screen

Technical Field

The invention relates to a detection method and a device of a display screen, in particular to a Demura detection method and a Demura detection device of the display screen.

Background

A display screen, such as a mobile phone screen, is generally composed of a cover glass, a touch module, a display module, and the like from the outside to the inside. With the development of technology, an OLED (organic light-Emitting Diode) is used as a current-type light-Emitting device, and due to its self-Emitting property, compared with an LCD, an AMOLED (Active-matrix organic light-Emitting Diode) has many advantages such as high contrast, ultra-light and thinness, and flexibility, and has been increasingly applied to high-performance display; at the same time, cover glasses are increasingly turning from flat panels to 2D, 2.5D, and 3D. The existing display screen which is more adopted is characterized in that a display module adopts an OLED, and the cover plate glass adopts 3D double bending (two curved surfaces, namely bending corresponding to the left and right opposite sides of the display screen) and four bending (four curved surfaces, namely bending corresponding to the left and right opposite sides of the display screen and the top and bottom opposite sides).

When the bending angle (namely the angle between the straight edge of the bent R angle on the curved surface side of the display screen and the screen plane) exceeds 30 degrees, pixels on the curved surface side of the display screen cannot be fed back into the detection lens, and the detection lens cannot take the image on the curved surface side, so that the detection lens can only detect the upper surface (namely the screen plane) of the display screen and cannot detect the curved surface side of the display screen.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method and an apparatus for Demura detection of a display screen, which can effectively realize Demura detection of the whole display screen to be detected, aiming at the above defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: when a detection lens cannot directly acquire imaging of the curved surface side of a display screen to be detected, a prism unit is arranged corresponding to the position of the curved surface side, light transmission is changed by the prism unit, and an actual display picture on the curved surface side is sent to the detection lens.

The technical scheme adopted by the invention for solving the technical problems is as follows: a Demura detection device of a display screen is provided, which comprises: the detection lens is arranged above the display screen to be detected and used for capturing an actual display picture of the display screen to be detected; and at least one prism unit for imaging the light emitted from the curved surface side of the display screen to be detected to the detection lens.

In some embodiments, further comprising: a base plate; the bearing platform is arranged on the bottom plate and used for bearing the display screen to be detected; the display screen lighting unit is arranged on the bottom plate and used for being electrically communicated with the display screen to be detected and controlling a set display picture of the display screen to be detected; wherein, the at least one prism unit is arranged on the bearing platform.

In some embodiments, the prism unit comprises a prism and a prism mounting mechanism for mounting the prism, the position of the prism is adjustable, and the angle of the prism towards the display screen to be detected is adjustable.

In some embodiments, the prism mounting mechanism comprises a mounting bracket, a mounting base, a position adjustment member, and an angle adjustment member; wherein, this prism is installed on this mounting bracket, and the position of this mounting bracket can be adjusted through this position control spare, and the angle of this mounting bracket can be adjusted through this angle control spare.

In some embodiments, the carrier platform comprises a substrate and a carrier stage; the base plate is arranged on the bottom plate, the bearing table is arranged on the base plate, and the prism unit is arranged on the base plate.

In some embodiments, the display screen lighting unit includes a fixing plate, a rotary driving member, a rotating plate, a connecting plate, an adapter probe, and a main plate; the rotating driving part is installed on the fixing plate, the rotating plate is connected with the rotating driving part, the rotating plate is driven to move by the rotating driving part, the connecting plate is connected with the FPC connector of the display to be detected, the adapter plate is connected through the adapter probe, the adapter plate is conducted with the mainboard, and the display screen to be detected is lightened.

In some embodiments, two prism units are provided for a set of opposing two curved sides of the display to be detected.

In some embodiments, four prism units are provided for two sets of opposing curved sides of the display to be detected.

In some embodiments, the display module of the display screen to be detected adopts an OLED, and the cover glass adopts a 3D double-curved or quadruple-curved structure, wherein the bending angle of at least two curves is 30 ° to 160 °.

The invention has the advantages that the prism unit is skillfully arranged aiming at the curved surface side of the display screen to be detected, and the actual display picture on the curved surface side is sent to the detection lens by the prism unit, so that demura detection of the whole display screen to be detected can be effectively realized.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a Demura detection method and apparatus for a display screen according to the present invention.

FIG. 2 is another schematic diagram of the Demura detection method and apparatus of the display screen of the present invention.

FIG. 3 is a schematic perspective view of a display screen according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the operation of an embodiment of the Demura detection apparatus.

FIG. 5 is a schematic perspective view of a supporting platform and a prism unit in an embodiment of the Demura detection apparatus.

FIG. 6 is a schematic perspective view of a display screen lighting unit in an embodiment of the Demura detection apparatus.

Wherein the reference numerals are as follows: 10 Demura detection device 50 to be detected display screen 1

detection lens

2, 3, 4, 5 prism unit 21 prism 22 prism installation mechanism 221 mounting bracket 222 mounting bracket 223 angle adjusting piece 224 angle adjusting piece 8 base plate 6 bearing platform 61 base plate 62 bearing platform 7 display screen lighting unit 71 fixed plate 72 rotary driving piece 73 rotating plate 74 connecting plate 75 adapter plate 76 adapter plate 77 switching probe 77 mainboard.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The invention provides a Demura detection method of a display screen, which is characterized in that when a detection lens cannot directly acquire the image on the curved surface side of the display screen to be detected, a prism unit is arranged corresponding to the position of the curved surface side, the transmission of light is changed by the prism unit, and the actual display picture on the curved surface side is sent to the detection lens.

Referring to fig. 1, fig. 1 is a schematic diagram of a Demura detection method and apparatus of a display screen according to the present invention. Fig. 1 illustrates an application scenario of the Demura detection method and device for the display screen of the present invention applied to hyperboloid detection. The detection device 10 is used for performing Demura detection on the display screen 50 to be detected. The display screen 50 has a flat main surface 501 and two

curved surfaces

502, 503 on opposite sides of the main surface 501, respectively. The detection device 10 includes a detection lens 1 and two

prism units

2 and 3. The picture L1 generated on the main surface 501 of the display panel 50 is sent directly to the inspection lens 1, and the pictures L2 and L3 generated on the two

curved surfaces

502 and 503 of the display panel 50 are respectively subjected to the conversion processing of the optical transmission path by the two

prism units

2 and 3 and sent to the inspection lens 1.

It is understood that the display screen 50 to be inspected has a rectangular shape having left and right opposite sides and other opposite sides up and down. The display module of the display screen 50 to be detected adopts OLED, the cover plate glass adopts 3D two-bending or four-bending, and the bending angle of at least two-bending is 30-160 degrees.

When the bending angle of the curved surface side does not exceed 30 °, the light emission of the curved surface side can be directly imaged by the detection lens 1 without the aid of a prism unit. When the curved surface side bending angle is 90 °, the ends of the

curved surfaces

502 and 503 of the display screen 50 are perpendicular to the main surface 501 of the display screen 50, and when the curved surface side bending angle is larger than 90 °, the ends of the

curved surfaces

502 and 503 of the display screen 50 are bent further inward of the display screen 50.

Referring to fig. 2, fig. 2 is another schematic diagram of the Demura detection method and apparatus of the display screen of the present invention. FIG. 2 illustrates an application scenario of the Demura detection method and apparatus for a display screen according to the present invention applied to four-curved surface detection. The detection device 10 is used for performing Demura detection on the display screen 50 to be detected. The display screen 50 has a flat main surface 501, two

curved surfaces

502, 503 respectively located on opposite sides of the main surface 501, and two curved surfaces 504, 505 respectively located on opposite outer sides of the main surface 501. The detection device 10 includes a detection lens 1 and four

prism units

2, 3, 4, and 5. The screen L1 generated on the main surface 501 of the display panel 50 is sent directly to the inspection lens 1, and the screens L2, L3, L4, and L5 generated on the four

curved surfaces

502, 503, 504, and 505 of the display panel 50 are subjected to the conversion processing of the optical transmission path by the four

prism units

2, 3, 4, and 5, respectively, and sent to the inspection lens 1.

Referring to fig. 3 and 4, fig. 1 is a schematic perspective view of a Demura detection apparatus of a display screen according to an embodiment of the present invention. FIG. 4 is a schematic diagram of the operation of an embodiment of the Demura detection apparatus. The Demura detection apparatus 10 includes: the device comprises a bottom plate 8, four sets of bearing platforms 6, four sets of

prism units

2 and 3, four sets of display screen lighting units 7 and four sets of detection lenses 1. Wherein, a set of measuring lens 1 cooperates with a set of load-bearing platform 6, a set of

prism unit

2, 3 and a set of display screen lighting unit 7, can detect the Demura to a display screen 50 that awaits measuring.

The bearing platform 6 is arranged on the bottom plate 8 and is used for bearing the display screen 50 to be detected. The

prism units

2, 3 are mounted on the carrying platform 6 for imaging the light emitted from the curved surface side of the display screen 50 to be detected to the detection lens 1. In the present embodiment, two

prism units

2, 3 are provided on two opposite curved surfaces of the display screen 50 to be inspected, for performing necessary light transmission conversion to the curved surfaces; similarly to fig. 1, the picture L1 of the main surface of the display screen 50 to be inspected is sent directly to the inspection lens 1, and the pictures of the two opposite curved surfaces of the display screen 50 to be inspected are sent to the inspection lens 1 after being converted by the two

prism units

2 and 3. In other embodiments, referring to fig. 2, four

prism units

2, 3, 4, 5 may be provided on two opposite curved sides of two sets of the display screen 50 to be inspected for necessary light transmission conversion to the four curved sides.

The display screen lighting unit 7 is mounted on the base plate 8, and is used for electrically communicating with the display screen 50 to be detected and controlling the setting display picture of the display screen 50 to be detected.

The detection lens 1 is disposed above the display screen 50 to be detected, and is configured to capture an actual display image of the display screen 50 to be detected, and further, the actual display image captured by the detection lens 1 and a set display image provided by the display screen lighting unit 7 to the display screen 50 to be detected can be compared and analyzed by a processing unit (not shown in the figure, it can be understood that the processing unit includes a microprocessor and software running on the microprocessor), so as to achieve Demura detection of the display screen 50 to be detected.

It can be understood that, in the present embodiment, four sets of the supporting platforms 6 and four sets of the display screen lighting units 7 are arranged in parallel (in a row) on one bottom plate 8, and correspondingly, four sets of the detection lenses 1 are arranged above; in other embodiments, the number of the bearing platform 6, the display screen lighting unit 7 and the detection lens 1 is not limited to four, and may be one, two, three, five, six, etc. according to the requirement of practical application.

Referring to fig. 5, fig. 5 is a schematic perspective view of a carrying platform and a prism unit in an embodiment of the Demura detection apparatus. The carrier platform 6 includes a substrate 61 and a carrier table 62. Wherein, the substrate 61 is installed on the bottom plate 8, and the bearing table 62 is installed on the substrate 61. The two

prism units

2, 3 are respectively mounted on the base plate 61 and located on opposite sides of the carrier table 62.

The prism unit 2 includes a prism 21 and a prism mounting mechanism 22 for mounting the prism 21. The prism mounting mechanism 22 further includes a mounting bracket 221, a mounting base 222, a position adjusting member 223, and an angle adjusting member 224. Wherein the prism 21 is mounted on the mounting frame 221. The mounting seat 222 is mounted on the substrate 61, and the position of the mounting frame 221 can be adjusted by a position adjusting member 223, for example, the position adjusting member 223 is a micrometer. The angle of the mounting bracket 221 (i.e., the angle of the prism 21 toward the carrier 62) can be adjusted by the angle adjuster 224. These adjustments of the position and angle of the prism 21 are displayed with visual scales facing the operator. The prism unit 3 is similar in structure to the prism unit 2, and will not be described in detail.

Referring to fig. 6, fig. 6 is a schematic perspective view of a display screen lighting unit in an embodiment of the Demura detection apparatus. The display screen lighting unit 7 includes a fixed plate 71, a rotary driving member 72, a rotary plate 73, a connection plate 74, an adapter plate 75, an adapter probe 76, and a main plate 77.

The rotary drive 72 is mounted on the fixed plate 71, for example, the rotary drive 72 is a rotary cylinder. The rotating plate 73 is connected to the rotary drive member 72, and the rotary drive member 72 drives the rotating plate 73 to operate. The connection board 74 is connected to the FPC connector of the display 50 to be inspected, and is connected to the adapter board 75 through the adapter probe 76, and the adapter board 75 is electrically connected to the main board 77, thereby lighting the display 50 to be inspected.

The invention has the advantages that the

prism units

2, 3, 4 and 5 are skillfully arranged aiming at the curved surface side of the display screen 50 to be detected, and the actual display picture on the curved surface side is sent to the detection lens 1 by means of the

prism units

2, 3, 4 and 5, so that demura detection of the whole display screen 50 to be detected can be effectively realized.

It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and such modifications and substitutions are intended to be included within the scope of the appended claims.

Claims

1. A Demura detection device of a display screen is characterized by comprising: the detection lens is arranged above the display screen to be detected and used for capturing an actual display picture of the display screen to be detected; and at least one prism unit for imaging the light emitted from the curved surface side of the display screen to be detected to the detection lens.

2. The Demura detecting apparatus of a display screen of claim 1, further comprising: a base plate; the bearing platform is arranged on the bottom plate and used for bearing the display screen to be detected; the display screen lighting unit is arranged on the bottom plate and used for being electrically communicated with the display screen to be detected and controlling a set display picture of the display screen to be detected; wherein, the at least one prism unit is arranged on the bearing platform.

3. The Demura detecting apparatus of claim 2, wherein the prism unit comprises a prism and a prism mounting mechanism for mounting the prism, a position of the prism is adjustable, and an angle of the prism toward the display to be detected is adjustable.

4. The Demura detecting apparatus of claim 3, wherein the prism mounting mechanism comprises a mounting frame, a mounting seat, a position adjusting member and an angle adjusting member; wherein, this prism is installed on this mounting bracket, and the position of this mounting bracket can be adjusted through this position control spare, and the angle of this mounting bracket can be adjusted through this angle control spare.

5. The Demura detecting apparatus of claim 2, wherein the supporting platform comprises a substrate and a supporting platform; the base plate is arranged on the bottom plate, the bearing table is arranged on the base plate, and the prism unit is arranged on the base plate.

6. The Demura detecting apparatus of claim 2, wherein the display screen lighting unit comprises a fixing plate, a rotary driving member, a rotating plate, a connecting plate, an adapter probe and a main plate; the rotating driving part is installed on the fixing plate, the rotating plate is connected with the rotating driving part, the rotating plate is driven to move by the rotating driving part, the connecting plate is connected with the FPC connector of the display to be detected, the adapter plate is connected through the adapter probe, the adapter plate is conducted with the mainboard, and the display screen to be detected is lightened.

7. The Demura detection apparatus of a display screen of claim 1, wherein two prism units are provided for a set of two opposite curved sides of the display screen to be detected.

8. The Demura detection apparatus of a display screen of claim 1, wherein four prism units are provided for two sets of opposite curved sides of the display screen to be detected.

9. The Demura detection device of a display screen of any one of claims 1 to 8, wherein a display module of the display screen to be detected adopts OLED, a cover glass adopts 3D double-bending or four-bending, and the bending angle of at least two bends is 30-160 °.

10. A Demura detection method of a display screen is characterized in that when a detection lens cannot directly acquire imaging of the curved surface side of the display screen to be detected, a prism unit is arranged corresponding to the position of the curved surface side, light transmission is changed by the prism unit, and an actual display picture of the curved surface side is sent to the detection lens.