CN109959449B

CN109959449B - Device for sensing front brightness of display

Info

Publication number: CN109959449B
Application number: CN201711430923.0A
Authority: CN
Inventors: 李明山; 徐斌; 杨阳; 谢新兵; 魏永泽
Original assignee: Shenzhen Beacon Display Technology Co ltd
Current assignee: Shenzhen Beacon Display Technology Co ltd
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2021-05-14
Anticipated expiration: 2037-12-26
Also published as: CN109959449A

Abstract

The invention relates to a device for sensing the front brightness of a display, which comprises a light guide column and a photosensitive chip, wherein the light guide column is provided with a lighting section which vertically and upwards extends right at the front of the display screen, a transmission section which horizontally extends perpendicular to the output end of the lighting section and a light gathering section which vertically and downwards extends from the output end of the transmission section; the light emitted by the display screen enters from the input end of the lighting section, is reflected by 90 degrees at the joint of the lighting section and the transmission section, is reflected by 90 degrees at the joint of the transmission section and the light-gathering section, and then is emitted from the output end of the light-gathering section to the photosensitive chip. The device reduces the influence of various factors on the light receiving source of the photosensitive chip and greatly improves the accuracy of data acquisition.

Description

Device for sensing front brightness of display

Technical Field

The present invention relates to display calibration technology, and more particularly, to an apparatus for sensing front luminance of a display.

Background

The lighting method for calibration of the display in the market at present is to directly place the photosensitive chip on the front surface of the display screen, as shown in fig. 1, the front shell 20 of the display has a front shell side plate 21 and a front shell panel 22, and a blocking edge 23 is extended from the inner edge of the front shell panel 22 to the front surface of the display screen 10, and the photosensitive chip 30 is directly placed on the front surface of the display screen inside the blocking edge 23. The following two effects are caused by such a structure: (1) the light emitted by the periphery which does not belong to the display screen can be received by the photosensitive chip; (2) the light source received by the photosensitive chip is not subjected to shading and condensing processes, and the light source emitted by the display screen is lost in the process of reaching the photosensitive chip. In this way, the light source received by the light sensing chip is highly influenced by various factors, and the light sensing chip cannot accurately acquire real data. The data is inaccurate, and the self-parameter correction function of the display is basically disabled.

Disclosure of Invention

The present invention is directed to a device for sensing front luminance of a display, which can more accurately transmit a light source of a display screen to a photo sensor chip, so as to achieve accurate calibration of the display.

The technical scheme adopted by the invention for solving the technical problems is as follows: the device for sensing the front brightness of the display comprises a light guide column and a photosensitive chip, wherein the light guide column is provided with a lighting section which vertically and upwards extends right at the front of the display screen, a transmission section which horizontally extends perpendicular to the output end of the lighting section and a light gathering section which vertically and downwards extends from the output end of the transmission section; the light emitted by the display screen enters from the input end of the lighting section, is reflected by 90 degrees at the joint of the lighting section and the transmission section, is reflected by 90 degrees at the joint of the transmission section and the light-gathering section, and then is emitted from the output end of the light-gathering section to the photosensitive chip.

According to one embodiment of the present invention, the first cross-sectional area of the input end of the lighting section is larger than the second cross-sectional area of the output end of the light-concentrating section.

According to one embodiment of the invention, the lighting section and the transmission section have the same first cross-section, and the light collection section comprises an input portion having the first cross-section, an output portion having the second cross-section, and a transition portion connected therebetween.

According to one embodiment of the invention, the first cross-section is rectangular and the second cross-section is square.

According to one embodiment of the invention, the outer surface of the light guide pole is plated with bright chrome and then sprayed with black paint.

According to one embodiment of the invention, the connection part of the lighting section and the transmission section and the connection part of the transmission section and the light gathering section form a 45-degree reflection inclined plane.

According to an embodiment of the invention, the device further comprises a shading pad which surrounds the blocking edge on the front shell panel and is attached to the front surface of the display screen, and the shading pad is provided with a first shading wall and a second shading wall which are just clamped at two sides of the blocking edge to shade the lighting section of the light guide column.

According to one embodiment of the invention, the device further comprises a shading sleeve sleeved on the photosensitive chip and the periphery of at least part of the light-gathering section adjacent to the photosensitive chip.

According to one embodiment of the invention, the device further comprises a bracket fixed on the side surface of the display screen, the photosensitive chip is arranged on a PCB and fixed on the bracket through the PCB, and the shading sleeve is provided with a mounting position fixedly mounted with the bracket.

According to an embodiment of the invention, the device further comprises an L-shaped limiting sheet, a first section of the L-shaped limiting sheet extending horizontally is pressed between the transmission section of the light guide column and the front shell panel, and a second section of the L-shaped limiting sheet extending vertically is fixedly installed with the bracket.

According to the device for sensing the front brightness of the display, the light source of the display screen is transmitted to the photosensitive chip arranged in the gap between the side plate of the front shell and the side surface of the display screen through the light guide column, so that the influence of various factors on the photosensitive chip to receive the light source is reduced, the photosensitive chip can sense the front brightness of the display screen more accurately, and the accuracy of data acquisition is greatly improved. According to the device for sensing the front brightness of the display, disclosed by the embodiment of the invention, the light source of the display can be accurately transmitted to the photosensitive chip basically through the matching of the light shielding pad, the light shielding sleeve, the limiting sheet and the light guide column, so that the aim of accurately calibrating the display is fulfilled.

Drawings

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

FIG. 1 is a diagram illustrating a prior art manner of sensing front luminance of a display;

FIG. 2 is a schematic structural diagram of an apparatus for sensing front luminance of a display according to an embodiment of the present invention;

FIG. 3 is a schematic perspective exploded view of an apparatus for sensing front luminance of a display according to an embodiment of the present invention;

FIG. 4 is a schematic perspective view of a light guide bar according to an embodiment of the present invention;

fig. 5 is a schematic optical path diagram of an apparatus for sensing front luminance of a display according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 2 is a schematic structural diagram illustrating an apparatus for sensing front luminance of a display according to an embodiment of the present invention. As shown in FIG. 2, the device is mainly composed of a light guide bar 340 and a photosensitive chip 320. The light guide column 340 has a lighting section 341, a transmission section 342, and a light-condensing section 343. The lighting section 341 extends vertically upward facing the front surface 12 of the display screen 10, the transmission section 342 extends horizontally perpendicular to the output end of the lighting section 341, and the light-condensing section 343 extends vertically downward from the output end of the transmission section 342. The light collecting section 341 is disposed on the front panel 22 of the front housing 20 and directly faces the inner side of the extending edge 23 of the front face 12 of the display, the transmission section 342 is disposed in the gap between the front panel 22 and the front face 12 of the display, and the light collecting section 343 is disposed in the gap between the side plate 21 of the front housing and the side face 11 of the display. The light sensing chip 320 is disposed right below the output end of the light-gathering section 343. The light source of display screen 10 transmits to photosensitive chip 320 through light guide 340, because photosensitive chip 320 is located the space between preceding shell curb plate 21 and the display screen side 11 to reduce the influence that various factors received the light source to photosensitive chip 320, make the positive luminance of sensing display screen that photosensitive chip 320 can be more accurate, improve its data acquisition accuracy by a wide margin. Referring to fig. 5, light (shown by an arrow 41) emitted from the display screen 10 enters the lighting section 341 from the input end of the lighting section 341 (shown by an arrow 42), then enters the transmission section 342 after being reflected by 90 ° at the joint of the lighting section 341 and the transmission section 342 (shown by an arrow 43), then enters the light-gathering section 343 after being reflected by 90 ° at the joint of the transmission section 342 and the light-gathering section 343 (shown by an arrow 44), and finally exits from the output end of the light-gathering section 343 on the photo chip 320.

As shown in fig. 2, the device for sensing the front brightness of the display further includes a light-shielding sleeve 330, a light-shielding pad 350, a position-limiting sheet 360 and a bracket 310. The bracket 310 is fixed on the display screen side 11, for example, the bracket 310 can be fixed on the display screen side 11 by structural adhesive, and the photosensitive chip 320, the light shielding sleeve 330 and the limiting sheet 360 are all fixedly mounted on the bracket 310. Specifically, as shown in fig. 2 and fig. 3, the light shielding pad 350 is attached to the front surface 12 of the display screen 10, and has a first light shielding wall 351 and a second light shielding wall 352 that are just clamped on the front housing panel 22 and are located at two sides of the blocking edge 23, so as to surround the blocking edge 23 to shield the lighting section 341 of the light guiding column 340, thereby preventing light of the display screen 10 from diffusing around at the input end of the lighting section 341 entering the light guiding column 340, and preventing external light from entering the light guiding column 340. The bracket 310 has an L-shape having a vertical plate 311 fixed to the display screen side 11 and a horizontal plate 312 horizontally extending from the vertical plate 311. The photosensitive chip 320 is disposed on the PCB 360, and the PCB 360 is further fastened to the stud 313 protruding upward vertically on the horizontal plate 312 of the bracket 310 through screws. The light shielding sleeve 330 is hollow and is sleeved on the periphery of the photosensitive chip 320 and a part of the light focusing section 343 close to the photosensitive chip 320, so that light emitted from the output end of the light focusing section 343 can be prevented from being diffused to the periphery, and external light can be prevented from being received by the photosensitive chip 320. The stopper piece 360 is L-shaped and has a first section 361 extending horizontally and a second section 362 extending vertically. The first segment 361 of the limiting sheet 360 is pressed between the transmission segment 342 of the light guide column 340 and the front shell panel 22, so that the light guide column 340 can be prevented from moving up and down. The second section 362 of the limiting piece 360 and the

mounting positions

331 and 332 arranged on the two sides of the exterior of the light shielding sleeve 350 are locked on the stud 314 protruding from the vertical plate 311 of the bracket 310 corresponding to the water skin through screws, so that the fixing with the bracket 310 is realized.

The light guide bar 340 according to an embodiment of the present invention is structured as shown in fig. 4, wherein the light collection section 341 and the light collection section 343 are parallel to each other and perpendicular to both ends of the transmission section 342, respectively. A 45-degree reflection inclined plane 344 is formed at the joint of the lighting section and the transmission section, and the light rays input into the lighting section 341 are reflected by 90 degrees and then enter the transmission section 342; transport segment 342A 45 ° reflection inclined plane 345 is also formed at the connection position of the light collection section 343, and reflects the light rays input into the transmission section 342 by 90 ° and then enters the light collection section 343. The light collecting section 341 and the light transmitting section 342 have the same rectangular cross section, and the light collecting section 343 includes an input portion having a rectangular cross section, an output portion having a square cross section, and a transition portion connected therebetween, and the rectangular cross section is larger than the square cross section, so that the light collecting effect of the light guide column 340 can be achieved. Preferably, the rectangular cross-section has an area of 12mm²The area of the square section is 9mm²The sectional area is reduced by 25 percent for light condensation. In addition, bright chrome can be electroplated on the outer surface of the light guide column 340 to help the light guide column to condense, and then black paint is sprayed on the outer surface of the light guide column, so that light leakage in the transmission process can be prevented, and a high-quality light transmission channel can be realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A device for sensing the front brightness of a display is characterized by comprising a light guide column and a photosensitive chip, wherein the light guide column is provided with a lighting section which vertically and upwards extends right at the front of the display screen, a transmission section which horizontally extends perpendicular to the output end of the lighting section and a light gathering section which vertically and downwards extends from the output end of the transmission section; the light emitted by the display screen enters from the input end of the lighting section, is reflected by 90 degrees at the joint of the lighting section and the transmission section, is reflected by 90 degrees at the joint of the transmission section and the light-gathering section, and then is emitted from the output end of the light-gathering section to the photosensitive chip;

the device also comprises a shading pad which surrounds the blocking edge on the front shell panel and is attached to the front surface of the display screen, and the shading pad is provided with a first shading wall and a second shading wall which are just clamped at the two sides of the blocking edge to shade the lighting section of the light guide column;

the device also comprises a shading sleeve sleeved on the periphery of the photosensitive chip and at least part of the light-gathering section close to the photosensitive chip.

2. The apparatus for sensing the front luminance of a display according to claim 1, wherein a first cross-sectional area of the input end of the lighting section is larger than a second cross-sectional area of the output end of the light-condensing section.

3. The apparatus for sensing front luminance of a display according to claim 2, wherein the lighting section and the transmission section have the same first cross-section, and the light-condensing section includes an input portion having the first cross-section, an output portion having the second cross-section, and a transition portion connected therebetween.

4. The device for sensing the front luminance of a display according to claim 3, wherein the first cross section is rectangular and the second cross section is square.

5. The device for sensing the front brightness of a display according to claim 1, wherein the outer surface of the light guide pillar is coated with black paint after being electroplated with bright chrome.

6. The device for sensing the front brightness of a display according to claim 1, wherein the junction of the lighting segment and the transmission segment and the junction of the transmission segment and the light-gathering segment form a 45 ° reflection slope.

7. The device for sensing the front brightness of the display according to claim 1, further comprising a bracket fixed to the side of the display screen, wherein the light sensing chip is disposed on a PCB and fixed to the bracket through the PCB, and the light shielding sleeve is provided with a mounting position for fixing to the bracket.

8. The device for sensing the front brightness of a display according to claim 7, further comprising an L-shaped limiting sheet, wherein a first section of the L-shaped limiting sheet extending horizontally abuts against between the transmission section of the light guide column and the front shell panel, and a second section of the L-shaped limiting sheet extending vertically is fixedly mounted with the bracket.