TWI408345B - Adjustable standard low luminance device - Google Patents

Abstract

The present invention provides an adjustable standard low luminance device which utilizes a low illuminance light detector to detect the illuminance, transforms the detected illuminance into the luminance via a standard white board and then controls the output of the luminance through a luminance output regulator.

Description

Adjustable standard low brightness device

The invention relates to an adjustable standard low-brightness device, in particular to detecting illuminance through a low-illuminance standard detector, converting the illuminance into brightness by using a standard whiteboard, and controlling the brightness output thereof by a brightness output adjusting device. Adjustable standard low brightness device.

Most of the field of brightness measurement applications measure the brightness of screens or panels. From traditional cathode ray tube (CRT) screens to today's plasma or liquid crystal panels, picture brightness and uniformity are still the focus of quality requirements. In addition, the LED industry has flourished in recent years, and LED modules have also been applied to some large billboards. Therefore, the brightness measurement is also applied to the module for measuring LEDs.

Low brightness uses a tungsten filament lamp with an integrating sphere to homogenize the source and adjust the output with different aperture sizes. However, the accuracy of the aperture size affects the accuracy of the luminance output, and the range of low brightness adjustment will also be limited by the number of apertures. .

Furthermore, in the flat panel display (FPD) optical measurement, a basic measurement is the brightness measurement, and the corrected retrospective brightness meter is generally used to measure the FPD brightness value, and the brightness meter usually Traced back to a standard brightness source. In addition to the FPD brightness value, the contrast value is also an important optical parameter, and the FPD contrast value is defined as the ratio between the white picture and the black picture. The contrast value of today's FPD can be about 10,000 to one, which means that the black screen brightness value is 0.1 cd/m ² or even lower. Many brightness colorimeter manufacturers have introduced low-intensity measuring instruments. However, in general national standard laboratories, the brightness correction is as low as 1 cd/m ² , so the development of low-brightness standards is necessary to provide low-brightness measuring instruments. Calibration and standard traceability.

In one embodiment, the present invention provides an adjustable standard low-brightness device, comprising: a light source; an illuminance-converted brightness unit that detects an illuminance value of the light source and converts the illuminance value of the light source into Corresponding brightness value; and a brightness output adjusting unit that adjusts the brightness output required by the adjustable standard low brightness device according to the brightness value detected by the brightness unit.

In order to enable the reviewing committee to have a further understanding and understanding of the features, objects and functions of the present invention, the related detailed structure of the device of the present invention and the concept of the design are explained below so that the reviewing committee can understand the present invention. The detailed description is as follows: For low-brightness light sources, the prior art adjusts the light exit area to adjust and generate the brightness light source. However, the standard adjustable low-brightness light source is not easy to generate, so the present invention is modified to the first detection standard. The illuminance on the white board converts the measured illuminance into brightness; the brightness output adjustment device is used to adjust the illuminance measured by the high-sensitivity photodetector to produce a precise low-brightness light source.

In another aspect, the present invention utilizes the brightness of the low-intensity light source thus measured, and then controls the brightness output of the low-intensity light source by a brightness output adjusting device to obtain an adjustable standard low-lighting device to provide a low-brightness measuring instrument. The calibration and standard traceability, for example, can provide a low-luminance standard light source for the luminance colorimeter to correct the brightness and chromaticity values of the luminance colorimeter, and can also be used to correct the night vision goggles.

Figure 1 is a schematic diagram of the architecture of an adjustable standard low brightness device of the present invention. 2 is a schematic top view of the architecture of the adjustable standard low brightness device of the present invention. As shown in the figure, the adjustable standard low-lighting device 10 includes: a light source 101; an illuminance-converted brightness unit 102, which can detect the illuminance value of the light source 101, and convert the illuminance value of the light source 101 into a corresponding one. a brightness value; and a brightness output adjustment unit 103 that adjusts the brightness output required by the adjustable standard low brightness device 10 based on the brightness value detected by the brightness conversion brightness unit 102.

The light source 101 is a stable light source, which can use a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a tungsten filament lamp, and a fiber-optic light-conducting output. A stable source of light source, etc.

The illuminance conversion brightness unit 102 may further include: a standard whiteboard 1021 that reflects light to the instrument to be calibrated; and a low illuminance standard detector 1022 that is connected to the standard whiteboard 1021 when the light is illuminated. When the luminance unit 102 is converted into illumination, the low illumination standard detector 1022 generates a micro current, and the low illumination standard detector 1022 detects the micro current to measure the illumination, and then responds by a known standard whiteboard ( That is, the spectral reflectance), the measured illuminance can be converted into brightness.

The standard whiteboard 1021 has the characteristics of a Lambertian surface, and the light source 101 is output after being irradiated onto the standard whiteboard 1021, and the brightness values at different angles are consistent.

The low illumination standard detector 1022 can simulate the structure and imaging principle of the human eye, simulate the degree of perception of the human eye to the light source, the crystal of the eye is equivalent to the focusing lens group, and the imaged retina is equivalent to a low illumination standard detector. A uniform bright surface can be imaged on the retina via a crystal. Similarly, a uniform bright surface can be formed by the focusing mirror to the low illumination standard detector 1022, and the illumination and illumination surface received by the low illumination standard detector 1022. The brightness of the low illumination standard detector 1022 is proportional to the brightness value, and the brightness value to be measured can be directly read by the signal conversion.

The low illumination standard detector 1022 may further include: a filter 1022a, which is a correction filter for simulating the spectral response of the human eye; and a photo-sensing unit 1022b for detecting photocurrent, light. The current is generated by the light passing through the filter 1022a in the photo-sensing unit 1022b.

The filter 1022a can be a visual function filter or a human visual function filter or a human visual dark function filter. The light source can generate a photocurrent in the photo-sensing unit through the filter. And to detect the illuminance.

The brightness output adjustment unit 103 further includes a diffusion plate 1031 that can uniformize the incident light diffusion. In addition, the brightness output adjusting unit 103 further includes a baffle 1032 for blocking stray light from entering the diffusing plate 1031, and an aperture is disposed thereon for allowing a portion of the light to pass through, and the size of the aperture can be adjusted. The light source 101 is output at a small spot.

The diffuser 1031 and the baffle 1032 can be disposed on a moving device 104. The mobile device 104 can be moved on a slide rail 105 to adjust the position of the diffuser 1031 and the baffle 1032 to control the light source 101. Illuminating the illumination of the standard whiteboard 1021, thereby controlling the output of the adjusted brightness, and finally reflecting through the standard whiteboard 1021 for output use, so that the adjustable standard low-lighting device 10 can provide a controllable brightness output size and traceability. The low-brightness standard light source can adjust the brightness output value required by the brightness unit 102 according to the brightness value detected by the brightness unit 102. However, the slide is not necessary. The low-brightness standard light source provided by the adjustable standard low-lighting device 10 can be output to a to-be-corrected luminance colorimeter 20 or other instrument to be corrected, thereby correcting the luminance colorimeter 20 to be tested.

However, the above is only an embodiment of the present invention, and the scope of the present invention is not limited thereto. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

10. . . Adjustable standard low brightness device

101. . . light source

102. . . Illumination conversion brightness unit

1021. . . Standard whiteboard

1022. . . Low illumination standard detector

1022a. . . Filter

1022b. . . Photoelectric sensing unit

103. . . Brightness output adjustment unit

1031. . . Diffuser

1032. . . Baffle

104. . . Mobile device

105. . . Slide rail

20. . . Brightness colorimeter to be corrected

Figure 1 is a schematic diagram of the architecture of an adjustable standard low brightness device of the present invention.

2 is a schematic top view of the architecture of the adjustable standard low brightness device of the present invention.

10. . . Adjustable standard low brightness device

101. . . light source

102. . . Illumination conversion brightness unit

1021. . . Standard whiteboard

1022. . . Low illumination standard detector

1022a. . . Filter

1022b. . . Photoelectric sensing unit

103. . . Brightness output adjustment unit

1031. . . Diffuser

1032. . . Baffle

104. . . Mobile device

105. . . Slide rail

20. . . Brightness colorimeter to be corrected

Claims (7)

An adjustable standard low-brightness device includes: a light source; an illuminance-converted brightness unit, wherein the illuminance value of the light source is detected, and the illuminance value of the light source is converted into a corresponding brightness value, and the illuminance converts the brightness The unit further comprises: a standard whiteboard, which reflects light to the instrument to be calibrated; and a low illumination standard detector connected to the standard whiteboard, which is low when the light is illuminated on the standard whiteboard. The illuminance standard detector generates a photocurrent, the low illuminance standard detector can detect the photocurrent to measure the illuminance, and the measured illuminance can be converted into the brightness by the spectroscopic reflectivity of the standard whiteboard. And a brightness output adjusting unit, which is configured to adjust a brightness output required by the adjustable standard low brightness device according to the brightness value detected by the brightness unit, wherein the brightness output adjusting unit further comprises: a diffusion plate , which can uniformize the incident light diffusion; and a baffle plate for blocking stray light from entering the diffusing plate, and an aperture is disposed thereon for allowing part of the light to pass through, the diffusing plate The baffle system are disposed on a mobile device, so as to adjust the position of the diffusion plate and the baffle, to control the light source in the illumination of a standard white board. An adjustable standard low-light device as described in claim 1 of the patent application, The light source is a light emitting diode. The adjustable standard low brightness device of claim 1, wherein the light source is a cold cathode fluorescent lamp. The adjustable standard low brightness device of claim 1, wherein the light source is a tungsten lamp. The tunable standard low brightness device of claim 1, wherein the standard whiteboard has the characteristics of a Lambertian surface. The adjustable standard low-light device of claim 1, wherein the low-illuminance standard detector further comprises: a filter that simulates a spectral response of the human eye; and a photo-sensing unit. It is used to detect the photocurrent, and the photocurrent is generated by the light passing through the filter in the photo-sensing unit. The adjustable standard low brightness device according to claim 6, wherein the filter is a visual function filter or a human visual function filter or a human visual dark function filter.