TW201823692A - Correction apparatus and method for light source panel measuring actual brightness values of all the light source panels projected on the verification panel by an image capturing device - Google Patents

Abstract

A method for correcting a light source panel comprises the following steps: selecting a target light source panel from at least one light source panel; measuring a distance between each of the light source panels and a verification panel; obtaining brightness values of all the light source panels by a host; measuring actual brightness values of all the light source panels projected on the verification panel by an image capturing device; calculating an adjusted brightness value required by the target light source panel by a calculation module according to a target brightness value, the brightness values, the actual brightness values, and the distances; and adjusting the brightness of the target light source panel by the host and the adjusted brightness value, wherein the target brightness value is an overall brightness value to be reached by all the light source panels projected onto the verification panel.

Description

Calibration device and method for light source plate

The present invention relates to a calibration device and method, and particularly to a calibration device and method for a light source plate.

Please refer to FIG. 5. The conventional light source board 50 is also called a programmable numerical control light source board, and is composed of several to hundreds of light emitting modules 501. Each of the light-emitting modules 501 is composed of a plurality of light-emitting diodes. Therefore, each of the light-emitting modules 501 can independently control and display lights of different colors or different brightness. The existing light source plate 50 can be designed into various shapes such as square, circle, polygon, or bar shape according to customer requirements, and the light source plate 50 can be used for dynamic display of advertising signboards, normal lighting or backlighting and other applications.

However, after the light source plate 50 is manufactured, the brightness of each light emitting module 501 may be inconsistent. Therefore, before the light source plate 50 is shipped from the factory, brightness parameters are adjusted for the plurality of light emitting modules 501 so that The light emitting modules 501 have the same brightness.

However, after using the light source board 50 for a while, the plurality of light emitting modules 501 will cause the brightness to decrease with the increase of the usage time. The brightness parameters of the light source board 50 when leaving the factory have no reference value. When the plurality of light emitting modules 501 are depleted or damaged due to the service life, adjustment or replacement is required, often because the brightness of the new plurality of light emitting modules 501 and the original light source board 50 are inconsistent. As a result, the original brightness parameter of the light source plate 50 is no longer applicable. Therefore, it is necessary to readjust the parameter settings. It takes a lot of time to reset the new parameters. Therefore, it is necessary to design a new correction device and method for the existing light source plate 50. The dimming work of the light source board 50 can be performed quickly.

The purpose of this creation is to provide a correction device for a light source plate, through which the brightness of each light source plate can be adjusted according to the actual brightness of the light source plate.

According to the above purpose, the present invention provides a calibration device for a light source board, including: at least one light source board; a host, which is electrically connected to each of the light source boards to adjust the brightness value of the light source board, and includes a calculation module, The calculation module selects one of the at least one light source plate as a target light source plate, and calculates an adjusted brightness value required by the target light source plate according to a target brightness value; a verification plate is provided on all the light sources On the transmission path of the light from the board; an image capture device is provided corresponding to the verification board, and is electrically connected to the host to capture the images projected by the light source board on the verification board and transmit the image to The host, the host calculates the adjusted brightness value according to the brightness of the image, the distance between each light source plate and the calibration plate, and the target brightness value; wherein the target brightness value is all projected to the calibration plate by the light source plate The overall brightness value to be achieved.

Another object of the present invention is to provide a method for calibrating a light source plate, through which the brightness measurement of an actual condition is directly performed without parameter adjustment, so as to adjust the brightness of each light source plate.

According to the above purpose, the present invention provides a method for calibrating a light source plate, including the steps of: selecting a target light source plate from at least one light source plate; measuring a distance between each light source plate and a verification plate; The host obtains the brightness values of all the light source boards; and measures the actual brightness values of all the light source boards projected on the verification board through an image capture device according to a target brightness value, the brightness value, the actual brightness value and the distance, A calculation module calculates an adjusted brightness value required by the target light source plate; adjusts the brightness of the target light source plate through the host and the adjusted brightness value; wherein the target brightness value is all the light source plate is projected to the calibration The overall brightness value to be achieved by the panel.

The advantage of this creation is that it does not need to perform complicated parameter adjustments, and can actually adjust the current brightness of the light source board, so that the adjustment can be more accurate.

Please refer to FIG. 1. The correction device 10 for a light source plate of the present invention includes a host 11, a verification plate 12, and an image capture device 13. The correction device 10 of the present invention can be used to correct at least one light source plate 20. The light source board 20 is a numerically controlled light source board, which includes a plurality of light emitting modules 201, each of which is composed of a plurality of light emitting diodes, and the plurality of light emitting modules 201 are arranged in an array.

The host 11 is a computer host, and the host 11 is electrically connected to the light source board 20 to control the brightness and color emitted by the plurality of light emitting modules 201 of the light source board 20. In addition, because the host 11 is electrically connected to the light source board 20, the host 11 can directly estimate the brightness value generated by the light source board 20 from the power consumption of the light source board 20 and the thermal energy generated, or, in different embodiments A brightness measuring device (not shown) is provided on the light source board 20, and the measured brightness value of the light source board 20 can be transmitted back to the host 11, or the user can directly use a brightness measuring instrument. The brightness value of the light source plate 20 is measured. The measurement of the brightness value of the light source plate 20 is well known to those having ordinary knowledge in the art, and will not be repeated here.

The verification plate 12 is disposed on the light transmission path of the light source plate 20, and the light transmission path of the light source plate 20 may be a straight path or a diagonal path, as long as the light transmission range of the light source plate 20 is It may be the installation position of the verification plate 12. The image capture device 13 may be a digital camera (such as a camera with a Charge-Coupled Device (CCD), etc.), which is disposed corresponding to the verification plate 12 and is electrically connected to the host 11. The image capturing device 13 is used to capture an image of the light from the light source plate 20 projected on the verification plate 12. The image capturing device 13 can transfer the captured image to the host 11 for image brightness analysis to obtain an actual image. Brightness value. The host computer 11 calculates according to the brightness value, the actual brightness value, and the overall brightness value required by the light source plate 20 to adjust the brightness value of the light source plate 20.

Further, the host computer 11 of the numerical control light source board 10 of the present invention has a computing module 111, and the computing module 111 may be an application software or a firmware installed in the host computer 11, and the computing module 111 The group 111 performs brightness analysis according to the received image, and calculates a required adjustment brightness value of one of the light source boards 20 (herein referred to as a target light source board) according to the target brightness value set by the light source board 10. In this creation, the calculation module 111 uses a target pass algorithm to calculate the adjusted brightness value required by the target light source board, the formula is as follows:

Wherein, H is the adjusted brightness value required by the target light source plate. H1n, H2n,..., Hnn are the current brightness values of the light source plates 20. M is the target brightness value, and the target brightness value is the overall brightness value to be achieved by all the light source plates 20 projected onto the verification plate 12. Hn is the actual brightness value of the image captured by the image capture device 13 from the verification plate 12. L1, L2,..., Ln are the distances between the light source plate 20 and the verification plate 12. Minitial1 is the first constant and Minitial2 is the second constant.

The current brightness value of each light source plate 20 and the distance between each light source plate 20 and the verification plate 12 can be measured by a user and input into the host 11, and then calculated by the calculation module 111.

For example, as shown in FIG. 2, when the number of the light source plate 30 is one and it is disposed on one side of the verification plate 12, the image capture device 13 captures the image from the verification plate 12. The actual brightness value is 100, and the required target brightness value is 150. The light source plate 30 is referred to as the target light source plate, and the target light source plate is the light source plate 30 that needs to be adjusted for brightness. The brightness value of the light source plate 30 is 120. The brightness value of the light source plate 30 can be measured through the host 11 or the user can use a device for measuring the brightness of the light source to measure the brightness value of the light source plate 30. It is not limited here, and the distance between the light source plate 30 and the verification plate 12 is 500 mm (mm), then the adjusted brightness value of the light source plate 30 is: H = 120 + (150-100) /500*688=188.8, where the value 688 is a constant term (Minitial1). It can be seen that the light source plate 30 needs to be adjusted from the brightness value of 120 to the brightness value of 188.8.

Or, in another example, as shown in FIG. 3, the light source plates 40a, 40b, and 40c are provided on the first side, the second side, and the third side of the verification plate 12, and the first side The light source plate 40a has a brightness value of 80 and the distance from the verification plate 12 is 600 mm, the second light source plate 40b has a brightness value of 120 and a distance from the verification plate 12 is 500 mm, and the third The brightness value of the light source plate 40c on the side is 110 and the distance from the verification plate 12 is 300mm. The target brightness value of the light source plates 40a, 40b and 40c as a whole needs to be adjusted to 150. The light source plate 40b on the second side is the target light source plate in this embodiment, and the required adjusted brightness value is: H = 120 + (150-100) / 500 * 688-((80+ (150 -100) / 600 + (110+ (150-100) / 300)) / 3.58 = 135. Similarly, 688 is the first constant (Minitial1), 3.58 is the second constant, and the first constant and the second The constant is obtained through a large number of experiments according to the materials of the light source plates 40a, 40b, and 40c and the environment. Therefore, the brightness value of the light source plate 40b on the second side needs to be adjusted from 120 to 135, and so on. , Further calculating the adjusted brightness values required for the light source plate 40a on the first side and the light source plate 40c on the third side.

Please refer to FIG. 4, and refer to the reference numerals in FIG. 1. The method for calibrating a light source board of the present invention includes the following steps. In step S401, a target light source plate is selected from at least one light source plate 20. The target light source plate is the light source plate 20 whose brightness value needs to be adjusted. When there is a plurality of light source plates 20 that need to be adjusted in one embodiment, the correction method of the present invention adjusts the light source plate 20 one at a time. The adjusted light source plate 20 is referred to herein as a target light source plate. In different environments, different brightness values of the light source plate 20 need to be adjusted. Through the correction method for the light source plate 20 created by the author, the brightness of each light source plate 20 needs to be adjusted according to different needs. Value, and referring to the distance between each of the light source plates and the verification plate 12 to adjust the brightness value of each of the light source plates 20, thereby achieving the purpose of correcting the light source plate 20. For example, if the number of the light source plates 20 is one, the light source plate 20 is the target light source plate, and if the number of the light source plates 20 is two or more, one of the light source plates 20 is selected as the target light source plate. The rest are the general light source plate 20.

In step S402, the distance between each of the light source plates 20 and a verification plate 12 is measured. Since the installation position of each of the light source plates 20 is different, the distance between each of the light source plates 20 and the verification plate 12 is different. The distances are different, and the brightness intensity displayed at different distances is different. Therefore, the distances between the light source plates 20 and the verification plate 12 need to be measured first.

In step S403, the brightness value of each light source plate 20 is obtained through the host 11. Whether the light source plate 20 is manufactured or after a period of use, the brightness emitted by each light source plate 20 is different. Therefore, it is necessary to obtain the current brightness value of each light source plate 20, and then perform brightness adjustment of each light source plate 20. Since each of the light source boards 20 is electrically connected to the host 11 and the host 11 controls its turning on and off, the current brightness value of each of the light source boards 20 can be obtained through the host 11. Alternatively, in different embodiments, the user can obtain the current brightness value of each light source plate 20 through the brightness measuring instrument.

In step S404, an image capture device 13 is used to measure the actual brightness values of all the light source plates 20 projected on the verification plate 12. Take a picture of the verification plate 12 through the image capture device 13 to obtain an image of the light source plate 20 projected on the verification plate, and send the image to the host 11 for brightness analysis of the image to obtain the actual Brightness value.

In step S405, according to the target brightness value, the brightness value, the actual brightness value and the distance, a calculation module 111 is used to calculate a required brightness value of the target light source board. The target brightness value is the overall brightness value to be achieved when all the light source plates 20 are projected onto the verification plate 12, and the distance, brightness value, actual brightness value projected on the verification plate 12 and the target brightness value of each light source plate 20 are input into the calculation model. In the group 111, the adjusted brightness value required by the target light source plate can be obtained. The calculation module 111 is installed in the host 11, and the calculation formula applied by the calculation module 111 is as described above, and is not repeated here.

Finally, in step S406, the target light source plate is adjusted for brightness through the host 11 and the adjusted brightness value. If the calculated brightness value is higher than the current brightness value of the target light source board, it indicates that the brightness is insufficient, and the brightness of the light source board 20 is increased through the host 11; otherwise, if the brightness is too bright, the brightness is adjusted through the host 11 The brightness of the light source plate 20 is reduced. The brightness of each light source plate 20 is adjusted by using the original correction method, and finally the overall light source plate 20 is adjusted to an appropriate brightness. From the above calculation example, the dimming method of the present invention can be applied to at least one of the light source plates 20, and the adjusted brightness values required for each of the light source plates 20 are calculated one by one, and each of the light source plates 20 is adjusted to a desired value. The required brightness value enables the overall brightness to meet user requirements.

Through the above-mentioned calibration method, there is no need to set parameters, and through the measured brightness value and the distance between the light source plate and the correction plate, the image capture device is used to capture all the light source plates projected onto the entirety of the calibration plate. Brightness value, select a target light source plate, set a target brightness value, calculate the adjusted brightness value required for each light source plate, adjust the brightness of each light source plate according to the adjusted brightness value, and achieve brightness correction of the light source plate Compared with the existing parameter adjustment methods, simplification is required more, and it does not take much time to adjust the parameters.

10‧‧‧ Calibration device

11‧‧‧Host

111‧‧‧ Computing Module

12‧‧‧check board

13‧‧‧Image capture device

20‧‧‧light source board

201‧‧‧light emitting module

30‧‧‧light board

40a, 40b, 40c ‧‧‧ light source board

50‧‧‧light source board

501‧‧‧light emitting module

FIG. 1 is a schematic diagram of a correction device for a light source plate created in the present invention. FIG. 2 is a schematic diagram of the correction of the correction device for the light source plate created by the present invention. FIG. 3 is a schematic diagram of the correction of the correction device for the light source plate created by the present invention. FIG. 4 is a flowchart of a method for calibrating a light source board according to the present invention. FIG. 5 is a schematic plan view of a conventional light source board.

Claims (7)

A calibration device for a light source board includes: at least one light source board; a host, which is electrically connected to each of the light source boards to adjust the brightness value of the light source board, and includes a calculation module, which is composed of the at least one One of the light source boards is selected as a target light source board, and an adjusted brightness value required by the target light source board is calculated according to a target brightness value; a verification board is provided on the light transmission path of all the light source boards; An image capture device is provided corresponding to the verification plate, and is electrically connected to the host to capture images projected by the light source plate on the verification plate, and transmits the image to the host, and the host according to the image The brightness value, the distance between each light source plate and the verification plate, and the target brightness value are used to calculate the adjusted brightness value; wherein the target brightness value is the overall brightness value to be achieved when all the light source plates are projected onto the verification plate. The correction device for a light source board according to claim 1, wherein each of the light source boards includes a plurality of light emitting modules, and each of the light emitting modules is composed of a plurality of light emitting diodes (LEDs). The correction device for a light source plate according to claim 1, wherein the host controls the brightness and color emitted by the light emitting modules of each light source plate. The correction device for a light source plate according to claim 1, wherein the calculation module calculates the adjusted brightness value of the target light source plate according to the following formula: Where H is the adjusted brightness value required by the target light source board; H1n, H2n, ..., Hnn are the brightness values of each of the light source boards; M is the target brightness value; Hn is captured by the image capture device Take an actual brightness value of the image; L1, L2, ..., Ln are the distances of each light source plate from the verification plate; Minitial1 is a first constant; Minitial2 is a second constant. A calibration method for a light source board includes the steps of: selecting a target light source board among at least one light source board; measuring a distance between each of the light source boards and a verification board; obtaining the at least one light source board through a host Brightness value; measuring an actual brightness value of the at least one light source plate projected on the verification plate through an image capturing device; and using a calculation module according to a target brightness value, the brightness value, the actual brightness value and the distance Calculate an adjusted brightness value required by the target light source plate; adjust the brightness of the target light source plate through the host and the adjusted brightness value; wherein the target brightness value is the total to be achieved by all the light source plates projected onto the verification plate Brightness value. The method for calibrating a light source plate according to claim 5, wherein the adjustment brightness required by the target light source plate is calculated by the calculation module according to the target brightness value, the actual brightness value, the brightness value, and the distance. The formula applied in this step of the value is: Where H is the adjusted brightness value required by the target light source board; H1n, H2n, ..., Hnn are the brightness values of each of the light source boards; M is the target brightness value; Hn is captured by the image capture device The actual brightness value of the image taken; L1, L2, ..., Ln are the distances of the at least one light source plate from the verification plate; Minitial1 is a first constant; Minitial2 is a second constant. The calibration method for a light source board according to claim 5 or 6, wherein the computing module is installed in the host.