WO2017059644A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2017059644A1
WO2017059644A1 PCT/CN2015/099772 CN2015099772W WO2017059644A1 WO 2017059644 A1 WO2017059644 A1 WO 2017059644A1 CN 2015099772 W CN2015099772 W CN 2015099772W WO 2017059644 A1 WO2017059644 A1 WO 2017059644A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
chromaticity
dimming element
Prior art date
Application number
PCT/CN2015/099772
Other languages
English (en)
French (fr)
Inventor
陈瑞麟
苏昭旻
张景翔
郑鸿斌
邱威翔
方柏岚
伊伟
陈冠端
陈丽慧
陆韦中
Original Assignee
瑞仪光电(苏州)有限公司
瑞仪光电股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 瑞仪光电(苏州)有限公司, 瑞仪光电股份有限公司 filed Critical 瑞仪光电(苏州)有限公司
Priority to JP2018517729A priority Critical patent/JP2018530129A/ja
Priority to US15/439,956 priority patent/US10151868B2/en
Publication of WO2017059644A1 publication Critical patent/WO2017059644A1/zh
Priority to US16/158,293 priority patent/US10473843B2/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/506—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the invention relates to a light source assembly, and in particular to a backlight module and a display device.
  • a general display device mainly includes a backlight module and a display panel.
  • the light generated by the light source in the backlight module directly enters the light guide plate and then exits the light guide plate to enter the display panel.
  • the light generated by the light source may cause chromatic aberration before and after entering the light guide plate and the display panel.
  • the light source itself may have an error with its preset color depending on the use condition or the manufacturing condition, and thus the display effect of the display device may be seriously affected.
  • an object of the present invention is to provide a backlight module and a display device, which can improve the color shift problem of the light guide plate and the light entrance and exit portions of the display panel.
  • the backlight module includes a light source, a light guide plate, and a dimming element.
  • the light produced by the light source is capable of measuring the chromaticity of the source.
  • the light guide plate has a light incident surface and a light exit surface, and the light generated by the light source enters the light guide plate through the light incident surface, and is emitted from the light exit surface.
  • the chromaticity of the first light guide plate can be measured on the light exit surface of the light guide plate.
  • the first light guide plate has a first difference between the chromaticity of the light source and the chromaticity of the light source.
  • the chromaticity of the second light guide plate can be measured on the light exit surface of the light guide plate, and the second light guide plate has a second difference between the chromaticity of the second light guide plate and the chromaticity of the light source. value.
  • the first difference is different from the second difference.
  • the light guide plate further has a bottom surface opposite to the light exit surface.
  • the dimming element is located below the bottom surface of the light guide plate and/or above the light exit surface of the light guide plate, and is located on a side of the light guide plate adjacent to the light incident surface.
  • the backlight module further includes a light source reflective sheet.
  • Light source The film is placed on the bottom surface of the light guide plate.
  • the dimming element is disposed between the light source reflective sheet and the bottom surface, and is located on a side of the light guide plate adjacent to the light incident surface.
  • the light source further includes a circuit board and a plurality of light emitting diodes. These light emitting diodes are disposed on the circuit board.
  • the dimming element is disposed between the circuit board and the light guide plate, and is located on a side of the light guide plate adjacent to the light incident surface.
  • the backlight module further includes a diffusion sheet.
  • the diffusion sheet is disposed on the light emitting surface of the light guide plate.
  • the dimming element is disposed between the bottom surface of the diffusion sheet and the light exit surface.
  • one side of the diffusion sheet and the dimming element extends beyond the light incident surface of the light guide plate.
  • the dimming element is a film formed of an ink.
  • the dimming element is a color optical glue for adhering the light guide plate to the circuit board.
  • the display device includes the foregoing backlight module and a display panel.
  • the display panel is located in front of the light-emitting surface of the light guide plate.
  • the display device includes a light source, a light guide plate, a display panel, and a dimming element.
  • the light guide plate has a light incident surface and a light exit surface, and the light generated by the light source enters the light guide plate through the light incident surface, and is then emitted by the light exit surface.
  • the display panel is located in front of the light-emitting surface of the light guide plate.
  • the light-emitting surface of the light guide plate can measure the chromaticity of the light guide plate
  • the display panel can measure the chromaticity of the first display panel
  • the chromaticity of the light guide plate and the chromaticity of the first display panel Has the first difference.
  • the display panel can measure the second display panel chromaticity, the second display panel chromaticity has a second difference between the chromaticity of the light guide plate, and the first The difference is less than the second difference.
  • the display device includes a light source, a light guide plate, a display panel, and a dimming element.
  • the light guide plate has a light incident surface and a light exit surface, and the light generated by the light source enters the light guide plate through the light incident surface, and is then emitted by the light exit surface.
  • the display panel is located in front of the light-emitting surface of the light guide plate.
  • the light-emitting surface of the light guide plate can measure the chromaticity of the first light guide plate, and the first light guide plate has a first difference between the chromaticity and the required chromaticity.
  • the light-emitting surface of the light guide plate can be measured without the dimming element.
  • Second light guide color The second light guide plate has a second difference between the chromaticity and the required chromaticity, and the first difference is smaller than the second difference.
  • the light guide plate further has a bottom surface opposite to the light-emitting surface, and the light-adjusting element is located below the bottom surface of the light guide plate and/or above the light-emitting surface of the light guide plate, and is located on a side of the light guide plate adjacent to the light-incident surface.
  • the display device further includes a light source reflection sheet.
  • the light source reflection sheet is disposed on a bottom surface of the light guide plate, wherein the light adjustment element is disposed between the light source reflection sheet and the bottom surface.
  • the light source further includes a circuit board and a plurality of light emitting diodes. These light emitting diodes are disposed on the circuit board.
  • the dimming element is disposed between the circuit board and the light guide plate.
  • the dimming element is a color optical glue for adhering the light guide plate to the circuit board.
  • the dimming element is a film formed of an ink.
  • the display device further includes a diffusion sheet.
  • the diffusion sheet is disposed on the light-emitting surface of the light guide plate, wherein the dimming element is disposed between the bottom surface of the diffusion sheet and the light-emitting surface.
  • one side of the diffusion sheet and the dimming element extends beyond the light incident surface of the light guide plate.
  • the present invention reduces the incident chromaticity and the chromaticity of the light guide plate, the chromaticity of the light guide plate and the chromaticity of the light emitted by the display panel, or the chromaticity of the light guide plate by setting the dimming element.
  • the difference in chromaticity from the chromaticity of the light emitted from the display panel thereby reducing and improving the color shift between the light source and the light guide plate, between the light guide plate and the display panel, or between the light guide plate and the desired chromaticity.
  • FIG. 1A is a schematic diagram of an apparatus of a backlight module according to a first embodiment of the present invention
  • FIG. 1B is a top plan view of a backlight module in accordance with a first embodiment of the present invention
  • 1C is a schematic diagram showing the difference between the chromaticity of the light source and the chromaticity of the first light guide plate and the chromaticity of the second light guide plate according to the first embodiment of the present invention
  • Figure 2A shows the 1931 International Commission on Illumination (CIE) chromaticity diagram
  • 2B is a schematic diagram showing changes in color difference values of the U axis
  • 2C is a schematic diagram showing changes in color difference values of the V-axis
  • FIG. 3 is a schematic diagram of a device of a backlight module without using a dimming element
  • Figure 4 shows a comparison of light intensities using dimming elements and unused dimming elements
  • Figure 5 shows the effect of the dimming elements formed by different ink concentrations on the chromaticity difference between the light incident and the reverse light of the light guide plate
  • FIG. 6A is a schematic diagram of an apparatus of a display device in accordance with a second embodiment of the present invention.
  • 6B is a schematic view showing an apparatus of another display device in accordance with a second embodiment of the present invention.
  • 6C is a schematic diagram showing the difference between the chromaticity of the light guide plate and the chromaticity of the first display panel and the chromaticity of the second display panel according to the second embodiment of the present invention
  • 6D is a schematic diagram showing the difference between the required chromaticity and the chromaticity of the first light guide plate and the chromaticity of the second light guide plate according to the second embodiment of the present invention
  • Figure 7 is a schematic view showing a device of a display device not using a dimming element
  • FIG. 8 is a schematic diagram of an apparatus of a backlight module according to a third embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a device of a backlight module according to a fourth embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an apparatus of a backlight module according to a fifth embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an apparatus of a backlight module according to a sixth embodiment of the present invention.
  • FIG. 12 is a schematic diagram of an apparatus of a backlight module according to a seventh embodiment of the present invention.
  • FIG. 1A and FIG. 1B are schematic diagrams and top views of a device of a backlight module according to a first embodiment of the present invention.
  • the backlight module 100 of the present embodiment includes a light source 120, a light guide plate 140, a dimming element 160, and a light source reflection sheet 180.
  • the light guide plate 140 has a light incident surface 141, a light exit surface 143, and a bottom surface 145.
  • the light exit surface 143 is opposite to the bottom surface 145, and the light incident surface 141 is connected to the light surface 143 and the bottom surface 145.
  • the light guide plate 140 passes through the optical adhesive 130 Connected to the light source 120. As shown in FIG. 1A and FIG.
  • the light source reflective sheet 180 is disposed under the bottom surface 145 of the light guide plate 140 and on the side of the light guide plate 140 adjacent to the light incident surface 141 , and the dimming element 160 is disposed on the bottom surface 145 and the light source reflective sheet 180 . between. Therefore, part of the light generated by the light source 120 can enter the light guide plate 140 directly from the light incident surface 141 and be emitted from the light exit surface 143. Another portion of the light generated by the light source 120 can be reflected by the light adjustment element 160 and then from the light guide plate 140. The bottom surface 145 enters the light guide plate 140 and is emitted from the light exit surface 143.
  • FIG. 1C is a schematic diagram showing the difference between the chromaticity of the light source and the chromaticity of the first light guide plate and the chromaticity of the second light guide plate according to the first embodiment of the present invention.
  • 2A shows the 1931 CIE chromaticity diagram.
  • 460 nm to 770 nm in Fig. 2A indicates the wavelength of light.
  • the light generated by the light source 120 is capable of measuring the chromaticity of the light source.
  • the chromaticity of the source can be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in Fig. 2A.
  • the light emitting surface 143 of the light guide plate 140 can measure the chromaticity of the first light guide plate.
  • the first light guide chromaticity can also be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in FIG. 2A.
  • the first light guide plate has a first difference D1 or D1' between the chromaticity of the light source and the chromaticity of the light source. That is, the light generated by the light source 120 has a first color, and the light emitted from the light exit surface 143 of the light guide plate 140 has a second color, and the second color is different from the first color.
  • FIG. 3 shows a schematic diagram of a device of a backlight module without using a dimming element.
  • the backlight module 200 shown in FIG. 3 includes the foregoing light source 120, light guide plate 140, and light source reflection sheet 180, but does not include the light adjustment element 160 as shown in FIGS. 1A and 1B.
  • part of the light generated by the light source 120 can be directly incident from the light incident surface 141 into the light guide plate 140 and emitted from the light exit surface 143. Another portion of the light generated by the light source 120 is directly reflected by the light source reflective sheet 180.
  • the light guide plate 140 enters the bottom surface 145 of the light guide plate 140 and is emitted from the light exit surface 143. Therefore, after the light generated by the light source 120 is emitted from the light guide plate 140 without passing through the dimming element 160, the light output surface 143 of the light guide plate 140 can measure the chromaticity of the second light guide plate.
  • the second light guide chromaticity can also be represented by the chromaticity coordinates represented by one of the points on the CIE chromaticity diagram of 1931 shown in Fig. 2A.
  • the second light guide plate has a second difference D2 between the chromaticity of the light guide plate and the chromaticity of the light source. and also That is, in the case where the dimming element 160 is not provided, the light measured on the light-emitting surface 143 of the light guide plate 140 has a third color, which is different from the first color and different from the second color.
  • the first difference D1 or D1' is different from the second difference D2.
  • the first difference D1 or D1' is smaller than the second difference D2.
  • the light generated by the light source 120 generates a color shift (second difference D2) after being emitted from the light guide plate 140 without passing through the dimming element 160.
  • the dimming element 160 is provided, the color difference between the color of the light entering the light passing through the light guide plate 140 and the color of the light emitted from the light exiting surface 143 (the first difference D1 or D1') is smaller, that is, the degree of color shift is greater. small.
  • the function of the dimming element 160 is to reduce the chromaticity difference between the incoming light and the outgoing light, and to improve the color shift problem caused by the light generated by the light source 120 after passing through the light guide plate 140.
  • the “color shift” referred to in the present specification refers to the color shift generated by the second difference D2, and generally refers to the color shift which can be perceived by the average person through the naked eye.
  • the first difference D1 or D1' referred to herein is small, which means that the degree of color shift is small, and the color deviation (which can be regarded as no color shift) which can not be directly seen by the naked eye is generally available. In general, the product will have errors during use or assembly, so the first difference D1 or D1' is an acceptable reasonable range set according to the needs of the user (or customer manufacturer).
  • the dimming element 160 also has a color, and the color of the dimming element 160 can also be represented by the chromaticity coordinates represented by one of the points on the CIE chromaticity diagram of 1931 shown in FIG. 2A. Therefore, the light generated by the light source 120 can change the color of the light emitted from the light exit surface 143 of the light guide plate 140 after passing through the function of the dimming element 160.
  • the color of the dimming element 160 is a complementary color of the color represented by the chromaticity of the source.
  • the complementary color can be selected by drawing a line segment passing through one of the points P0 in the white area, such as line segment A1, in the CIE chromaticity diagram as shown in FIG. 2A, and the both ends of the line segment A1 are not located in the white area. .
  • the color represented by the chromaticity coordinates of the two ends of the line segment is a complementary color. Taking the line segment A1 of FIG. 2A as an example, the two end points of the line segment A1 are blue and yellow-green, respectively, and represent blue and yellow-green as complementary colors.
  • the color depth of the dimming element 160 can also determine the magnitude of the change in the bluish light. That is to say, the distance from the two ends of the line segment A1 to the point P0 can be adjusted according to the depth of the color.
  • FIG. 2B and FIG. 2C respectively show the variation of the color difference values of the U-axis and the V-axis.
  • the line U1 and the line V1 as shown in FIGS. 2B and 2C indicate that the U value and the V value near the light entrance are small, and close to the opposite The U value and the V value at the entrance light become larger, resulting in a larger color difference value.
  • the dimming element 160 is used, as shown by the line U2 and the line V2 shown in FIGS. 2B and 2C, the originally lower U value and V value close to the light entrance can be raised to a higher U value and V.
  • the value, and the U value and the V value after a distance from the incoming light are not too different from the U value and the V value near the entrance light. It can be seen that the use of the dimming element 160 can significantly improve the color shift problem at the light entrance, and does not excessively affect the chromatic aberration at the back end.
  • FIG. 4 shows a comparison diagram of light intensities using the dimming element and the unused dimming element.
  • the dimming element 160 is not used, as shown by the curve L1 shown in FIG. 4, the light generated by the light source 120 is bluish white.
  • the light generated by the light source 120 is reflected by the dimming element 160 to exhibit an effect of not biasing blue light (or yellowish light) (as shown by the curve L2 shown in FIG. 4).
  • the dimming element 160 shows a comparison diagram of light intensities using the dimming element and the unused dimming element.
  • the yellow-red dimming element 160 is used to reduce the energy of the blue wavelength by 8.5 with respect to the architecture without the dimming element 160. % and reduce the green light energy by 5.6%. Thereby, the blue light energy and the green light energy of the light entering the light of the backlight module 100 are reduced by the dimming element 160 to improve the chromaticity U value and V of the light entering the backlight module 100.
  • the light generated by the light source 120 is whiteish blue and the dimming element 160 is yellow for illustrative purposes only, and is not intended to limit the present invention.
  • the color of the dimming element 160 is designed according to the color of the light generated by the light source 120 or the color of the light generated by the light source 120 after entering the light guide plate 140.
  • the dimming element 160 is disposed on the light source reflective sheet 180 and located between the bottom surface 145 of the light guide plate 140 and the light source reflective sheet 180 .
  • the dimming element 160 can be a film formed of ink that can be attached directly to the light source reflective sheet 180 by attachment, or can be formed directly on the light source reflective sheet 180 by printing.
  • FIG. 5 shows the influence of the dimming elements formed by different ink concentrations on the chromaticity difference between the light entrance and the reverse light of the light guide plate.
  • different thick The dimming element 160 formed by the ink of the degree has a different effect on the light generated by the light source 120.
  • the higher the ink concentration of the dimming element 160 the smaller the difference in chromaticity between the light incident and the reverse light of the light guide plate 140.
  • the dimming element 160 formed by the dimming element 160 formed by the ink having a concentration of 4% is generated by the dimming element 160 formed by the ink having the difference of the chromaticity of the light-receiving plate 140 and the light entering the light having a concentration of 1%.
  • FIG. 6A is a schematic diagram of a device according to a second embodiment of the present invention
  • FIG. 6C shows a chromaticity of the light guide plate and the first display panel according to the second embodiment of the present invention.
  • the chromaticity of the light guide plate can also be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in Fig. 2A.
  • the display panel 310 can also measure the first display panel chromaticity.
  • the first display panel chromaticity can also be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in FIG. 2A.
  • the first display panel chromaticity and the light guide plate chromaticity have a first difference D3 or D3'. That is, the light emitted from the light exit surface 143 of the light guide plate 140 has a first color, and the light emitted from the display panel 310 has a second color, and the second color is not the same as the first color.
  • FIG. 6B shows a schematic diagram of another display device in accordance with a second embodiment of the present invention.
  • the backlight module 100 shown in FIG. 1A can also be applied to the display device 300' as shown in FIG. 6B.
  • the structure of the display device 300' shown in FIG. 6B is substantially the same as that of the display device 300 shown in FIG. 6A, and thus will not be described again.
  • FIG. 3 and FIG. 7, which also show a schematic diagram of a device for a display device that does not use a dimming element.
  • the backlight module 200 shown in FIG. 3 is applied to the display device 400, since the backlight module 200 does not include the dimming element 160 as shown in FIG. 1A, part of the light generated by the light source 120 can directly enter the light.
  • the surface 141 enters the light guide plate 140 and is emitted from the light exit surface 143.
  • the light is emitted from the light-emitting surface 143 of the light guide plate 140, it directly enters the display panel 310 disposed in front of the light guide plate 140, and then emits light from the display panel 310.
  • the display panel 310 can also measure The second display panel chromaticity is measured.
  • the second display panel chromaticity can also be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in FIG. 2A.
  • the dimming element 160 is not provided, the light emitted from the light-emitting surface 143 of the light guide plate 140 has a third color after passing through the display panel 310.
  • the second display panel chromaticity and the chromaticity of the light guide plate have a second difference D4, that is, the third color and the dimming component 160 are dimmed and then the self-light guide plate.
  • the first color of the light emitted by 140 is not the same and is not the same as the second color.
  • the first difference D3 or D3' is smaller than the second difference D4. That is to say, in the case where the dimming element 160 is provided, the color shift of the light emitted from the light exit surface 143 of the light guide plate 140 after passing through the display panel 310 is smaller than in the case where the dimming element 160 is not provided.
  • the dimming element 160 has a color, and the color of the dimming element 160 is designed in accordance with the aforementioned second display panel chromaticity measured without the dimming element 160. Therefore, the light generated by the light source 120 can change the color of the light from the light exit surface 143 of the light guide plate 140 and the light emitted from the display panel 310 after passing through the light control element 160.
  • the light generated by the light source 120 itself has the chromaticity of the light source
  • the light emitted from the light guide plate 140 has the chromaticity of the light guide plate and the light emitting surface of the light guide plate 140.
  • the light that is emitted 143 and enters the display panel 310 and is emitted from the display panel 310 also has display panel chromaticity.
  • the greater the difference between these chromaticities, the more serious the color shift. Therefore, the color of the dimming element 160 can be designed with these chromaticities as reference values to reduce the difference between these chromaticities. Taking the line segment A1 of FIG.
  • the yellowish green dimming element 160 may be selected. Further, the color depth of the dimming element 160 may also vary depending on the distance to the point P0.
  • FIG. 6D is a schematic diagram showing the difference between the required chromaticity and the chromaticity of the first light guide plate and the chromaticity of the second light guide plate according to the second embodiment of the present invention.
  • the light-emitting surface 143 of the light guide plate 140 can measure the chromaticity of the first light guide plate.
  • the color of the first light guide plate can also be illustrated by The chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in 2A are shown. Assuming that the chromaticity of the light emitted from the light guide plate 140 after passing through the display panel 310 does not change, the first light guide plate has a first difference D5 or D5' between the chromaticity and the required chromaticity. As shown in FIG. 6D and FIG.
  • the light generated by the light source 120 is emitted from the light guide plate 140 , and the light output surface 143 of the light guide plate 140 can measure the second light guide plate chromaticity.
  • the second light guide chromaticity can also be represented by the chromaticity coordinates represented by one of the points on the 1931 CIE chromaticity diagram shown in Fig. 2A. It is assumed that the chromaticity of the light emitted from the light guide plate 140 after passing through the display panel 310 does not change, and the second light guide plate has a second difference D6 between the chromaticity and the required chromaticity. In this embodiment, the first difference D5 or D5' is smaller than the second difference D6.
  • the color ray represented by the point P0 is the required chromaticity proposed by the user (or the manufacturer's customer)
  • the chromaticity of the second light guide plate is bluish.
  • the yellowish green dimming element 160 can be selected to change the bluish light to a color close to the point P0 (that is, the first light guide chromaticity).
  • the color depth of the dimming element 160 may also vary depending on the distance to the point P0.
  • the dimming elements can also have different set positions.
  • FIG. 8 is a schematic diagram of a device of a backlight module according to a third embodiment of the present invention.
  • the backlight module 500 includes a light source 520, a light guide plate 540, and a dimming element 560.
  • the light guide plate 540 has a light incident surface 541, a light exit surface 543, and a bottom surface 545.
  • the light-emitting surface 543 is opposite to the bottom surface 545, and the light-incident surface 541 is connected to the light-emitting surface 543 and the bottom surface 545.
  • FIG. 8 is a schematic diagram of a device of a backlight module according to a third embodiment of the present invention.
  • the backlight module 500 includes a light source 520, a light guide plate 540, and a dimming element 560.
  • the light guide plate 540 has a light incident surface 541, a light exit surface 543, and a bottom surface 545.
  • the light source 520 includes a circuit board 521 and a plurality of light emitting diodes 523 disposed on the circuit board 521, wherein the light emitting diodes 523 are electrically connected to the circuit board 521.
  • a portion of the bottom surface 545 of the light guide plate 540 is adhered to the circuit board 521 by the optical adhesive 530.
  • the dimming element 560 is disposed on the circuit board 521 and located on a side of the bottom surface 545 of the light guide plate 540 near the light incident surface 541. Therefore, part of the light generated by the light-emitting diode 523 can enter the light guide plate 540 directly from the light-incident surface 541 and be emitted from the light-emitting surface 543.
  • Another portion of the light generated by the light-emitting diode 523 can be reflected by the light-modulating element 560 and then from the light guide plate.
  • the bottom surface 545 of the 540 enters the light guide plate 540 and is emitted from the light exit surface 543. It should be noted that the function and structural design of the dimming element 560 are the same as those of the aforementioned dimming element 160, and therefore will not be described herein.
  • FIG. 9 is a schematic diagram of a device of a backlight module according to a fourth embodiment of the present invention.
  • the backlight module 600 is substantially the same as the backlight module 500 except that the circuit board 521 of the light source 520 is disposed on the light-emitting surface 543 of the light guide plate 540. That is to say, a part of the light-emitting surface 543 of the light guide plate 540 is adhered to the circuit board 521 of the light source 520 through the optical adhesive 530.
  • the dimming element 560 is disposed on the circuit board 521 and located on a side of the light-emitting surface 543 of the light guide plate 540 adjacent to the light-incident surface 141.
  • part of the light generated by the light-emitting diode 523 can enter the light guide plate 540 directly from the light-incident surface 541 and be emitted from the light-emitting surface 543. Another portion of the light generated by the light-emitting diode 523 can pass through the light-modulating element after entering the light guide plate 540. After the 560 is reflected, it is emitted from the light-emitting surface 543, and the same effect as the aforementioned light-adjusting element 160 can be achieved.
  • the backlight module 700 includes a back plate 710, a light source 720, a light guide plate 730, a first dimming element 740, a second dimming element 750, and a light source reflecting sheet 760.
  • the light guide plate 730 is adhered to the back plate 710 through the optical adhesive 771.
  • the light source reflection sheet 760 is disposed under the bottom surface 735 of the light guide plate 730 and adjacent to the light incident surface 731, and the first light adjustment element 740 is disposed between the bottom surface 735 and the light source reflection sheet 760.
  • the light source 720 includes a circuit board 721 and a plurality of light emitting diodes 723 disposed on the circuit board 721.
  • the circuit board 721 of the light source 720 is disposed on the light-emitting surface 733 of the light guide plate 730, and a portion of the light-emitting surface 733 of the light guide plate 730 is adhered to the circuit board 721 of the light source 720 through the optical adhesive 773.
  • the second dimming element 750 is disposed on the circuit board 721 and located on a side of the light-emitting surface 733 of the light guide plate 730 adjacent to the light-incident surface 731.
  • a part of the light generated by the LED 723 can be reflected by the first dimming element 740 and then emitted from the light emitting surface 733, and another part of the light can be reflected by the second dimming element 750 after entering the light guide plate 730.
  • the surface 733 is emitted, and the same effect as the aforementioned dimming element 160 can be achieved.
  • the dimming element can also be directly designed in the form of an optical glue.
  • FIG. 11 is a schematic diagram of a device of a backlight module according to a sixth embodiment of the present invention.
  • the backlight module 800 includes a light source 820, a light guide plate 840, and a dimming element 860.
  • the light guide plate 840 has a light incident surface 841, a light exit surface 843, and a bottom surface 845.
  • the light-emitting surface 843 is opposite to the bottom surface 845, and the light-incident surface 841 is connected to the light-emitting surface 843 and the bottom surface 845.
  • the light source 820 package A circuit board 821 and a plurality of light emitting diodes 823 disposed on the circuit board 821 are disposed, wherein the light emitting diodes 823 are electrically connected to the circuit board 821.
  • the dimming element 860 of the present embodiment is itself an optical glue and has adhesiveness. Therefore, a portion of the bottom surface 845 of the light guide plate 840 can be directly adhered to the circuit board 821 through the dimming element 860.
  • the dimming element 860 is disposed on the circuit board 821 and is located on a side of the bottom surface 845 of the light guide plate 840 near the light incident surface 841.
  • the dimming element 860 also has a color, and the color of the dimming element 860 can also be represented by the chromaticity coordinates represented by one of the points on the CIE chromaticity diagram of 1931 shown in FIG. 2A. Therefore, part of the light generated by the light-emitting diode 823 can directly enter the light guide plate 840 from the light-incident surface 841 and be emitted from the light-emitting surface 843. Another portion of the light generated by the light-emitting diode 823 can be reflected by the light-modulating element 860 and then from the light guide plate. The bottom surface 845 of the 840 enters the light guide plate 840 and is emitted from the light exit surface 843.
  • the light generated by the light source 820 can change the color of the light emitted from the light exit surface 843 of the light guide plate 840 after passing through the function of the dimming element 860.
  • the circuit board 821 of the light source 820 is disposed on the bottom surface 845 of the light guide plate 840.
  • the circuit board 821 of the light source 820 can be disposed on the light exit surface 843 of the light guide plate 840. That is, a portion of the light-emitting surface 843 of the light guide plate 840 is adhered to the circuit board 821 of the light source 820 through the dimming element 860.
  • the dimming elements can also have different set positions.
  • the backlight module 900 includes a light source 920, a light guide plate 940, a diffusion sheet 960, and a dimming element 980.
  • the light guide plate 940 has a light incident surface 941, a light exit surface 943, and a bottom surface 945.
  • the light-emitting surface 943 is opposite to the bottom surface 945, and the light-incident surface 941 is connected to the light surface 943 and the bottom surface 945.
  • FIG. 12 a schematic diagram of a device of a backlight module according to a seventh embodiment of the present invention is shown.
  • the backlight module 900 includes a light source 920, a light guide plate 940, a diffusion sheet 960, and a dimming element 980.
  • the light guide plate 940 has a light incident surface 941, a light exit surface 943, and a bottom surface 945.
  • the light-emitting surface 943 is opposite to the bottom surface
  • the light source 920 includes a circuit board 921 and a plurality of light emitting diodes 923 disposed on the circuit board 921, wherein the light emitting diodes 923 are electrically connected to the circuit board 921.
  • a portion of the bottom surface 945 of the light guide plate 940 is adhered to the circuit board 921 by the optical adhesive 930.
  • the diffusion sheet 960 is disposed on the light-emitting surface 943 of the light guide plate 940, and the number of the diffusion sheets 960 is plural, wherein one side of the lowermost diffusion sheet 960 extends beyond The light incident surface 941 of the light guide plate 940.
  • the dimming element 980 is disposed between the bottom surface of the lowermost diffusion sheet 960 and the light emitting surface 943 of the light guide plate 940, preferably, the dimming element The 980 extends over one side of the lowermost diffusion sheet 960 beyond the light incident surface 941 of the light guide plate 940 and covers a portion of the light emitting diode 923.
  • part of the light generated by the light-emitting diode 923 can enter the light guide plate 940 directly from the light-incident surface 941 and be emitted from the light-emitting surface 943. Another portion of the light generated by the light-emitting diode 923 can be reflected by the light-modulating element 980 and then enter the light guide plate. 940, and then emitted from the light exit surface 943. It should be noted that the function and structural design of the dimming element 980 are the same as those of the aforementioned dimming element 160, and thus are not described herein.
  • the present invention reduces the chromaticity of the light source and the chromaticity of the light guide plate, the chromaticity of the light guide plate and the chromaticity of the light emitted from the display panel, or the light output of the light guide plate.
  • the difference in chromaticity between the chromaticity and the required chromaticity thereby reducing and improving the color shift between the light source and the light guide plate, between the light guide plate and the display panel, or between the light guide plate and the desired chromaticity.

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Abstract

一种背光模组（100）及显示装置（300）。该背光模组（100）包括光源（120）、导光板（140）以及调光元件（160）。光源（120）所产生的光线能够测量出光源色度。导光板（140）具有入光面（141）及出光面（143）。光源（120）所产生的光线经由入光面（141）进入到导光板（140），再由出光面（143）射出。在具有调光元件（160）的情况下，导光板（140）的出光面（143）能够测量出第一导光板色度。该第一导光板色度与前述光源色度之间具有第一差值。相比之下，在不具有调光元件（160）的情况下，导光板（140）的出光面（143）能够测量出第二导光板色度，该第二导光板色度与前述光源色度之间具有第二差值。第一差值不同于第二差值。

Description

背光模组及显示装置 技术领域
本发明涉及一种光源组件，且特别涉及一种背光模组及显示装置。
背景技术
一般显示装置主要包括背光模组和显示面板。背光模组中的光源所产生的光线是直接进入导光板后再从导光板出光而进入显示面板中。
然而，光源所产生的光线在进入导光板和显示面板前后会产生色差。或者，光源本身也会因使用状况或制作条件不同而会与其预设的颜色有误差，因此将严重影响显示装置的显示效果。
发明内容
因此，本发明的目的在于提供一种背光模组及显示装置，其可改善导光板和显示面板的入光处与出光处的色偏问题。
根据本发明的上述目的，提出一种背光模组。该背光模组包括光源、导光板以及调光元件。光源所产生的光线能够测量出光源色度。导光板具有入光面及出光面，且光源所产生的光线经由入光面进入到导光板，再由出光面射出。在具有调光元件的情况下，在导光板的出光面能够量测出第一导光板色度。该第一导光板色度与前述光源色度之间具有第一差值。相比之下，在不具有调光元件的情况下，在导光板的出光面能够量测出第二导光板色度，该第二导光板色度与前述光源色度之间具有第二差值。第一差值不同于第二差值。
依据本发明的实施例，上述导光板还具有与出光面相对的底面。调光元件位于该导光板的底面下方和/或导光板的出光面上方，且位于导光板靠近入光面的一侧。
依据本发明的另一实施例，上述背光模组还包括光源反射片。光源反 射片设置在导光板的底面。调光元件设置在光源反射片与底面之间，且位于导光板靠近入光面的一侧。
依据本发明的又一实施例，上述光源还包括电路板以及多个发光二极管。这些发光二极管设置在电路板上。调光元件设置在电路板与导光板之间，且位于导光板靠近入光面的一侧。
依据本发明的再一实施例，前述背光模组还包括扩散片。扩散片设置在导光板的出光面上。其中，调光元件设置在扩散片的底面与出光面之间。
依据本发明的再一实施例，前述扩散片和调光元件的一侧延伸超过导光板的入光面。
依据本发明的再一实施例，其中调光元件为油墨形成的薄膜。
依据本发明的再一实施例，前述调光元件为具有颜色的光学胶，用于将导光板黏贴于电路板上。
根据本发明的上述目的，另提出一种显示装置。该显示装置包括前述背光模组以及显示面板。显示面板位于导光板的出光面前方。
根据本发明的上述目的，又提出一种显示装置。该显示装置包括光源、导光板、显示面板以及调光元件。导光板具有入光面及出光面，光源所产生的光线经由入光面进入到导光板，再由出光面射出。显示面板位于导光板的出光面前方。其中，在具有调光元件的情况下，导光板的出光面能够测量出导光板色度，显示面板能够测量出第一显示面板色度，且导光板色度与第一显示面板色度之间具有第一差值。相比之下，在不具有调光元件的情况下，显示面板能够测量出第二显示面板色度，该第二显示面板色度与导光板色度之间具有第二差值，且第一差值小于第二差值。
根据本发明的上述目的，又提出一种显示装置。该显示装置包括光源、导光板、显示面板以及调光元件。导光板具有入光面及出光面，光源所产生的光线经由入光面进入到导光板，再由出光面射出。显示面板位于导光板的出光面前方。其中，在具有调光元件的情况下，导光板的出光面能够测量出第一导光板色度，第一导光板色度与要求色度之间具有第一差值。相比之下，在不具有调光元件的情况下，导光板的出光面能够测量出 第二导光板色度。第二导光板色度与要求色度之间具有第二差值，而且第一差值小于第二差值。
依据本发明的实施例，导光板还具有与出光面相对的底面，调光元件位于导光板的底面下方和/或导光板的出光面上方，且位于导光板靠近入光面的一侧。
依据本发明的另一实施例，上述显示装置还包括光源反射片。光源反射片设置在导光板的底面，其中调光元件设置在光源反射片与底面之间。
依据本发明的又一实施例，上述光源更包括电路板以及多个发光二极管。这些发光二极管设置在电路板上。其中，调光元件设置在电路板与导光板之间。
依据本发明的再一实施例，上述调光元件为具有颜色的光学胶，用于将导光板黏贴于电路板上。
依据本发明的再一实施例，上述调光元件为油墨形成的薄膜。
依据本发明的再一实施例，上述显示装置还包括扩散片。扩散片设置在导光板的出光面上，其中调光元件设置在扩散片的底面与出光面之间。
依据本发明的再一实施例，上述扩散片和调光元件的一侧延伸超过导光板的入光面。
由上述可知，本发明通过设置调光元件来降低导光板的入光色度与出光色度之间、导光板出光色度与显示面板的出光色度之间、或导光板的入光色度与显示面板的出光色度之间的色度差值，进而降低并改善光源与导光板之间、导光板与显示面板之间、或导光板与要求色度之间的色偏。
附图说明
为了更完整地了解实施例及其优点，现参照结合附图进行下列描述，其中：
图1A示出依照本发明第一实施方式的一种背光模组的装置示意图；
图1B示出依照本发明第一实施方式的一种背光模组的俯视图；
图1C示出依照本发明第一实施方式的光源色度与第一导光板色度以及第二导光板色度之间的差值示意图；
图2A示出1931年国际照明委员会(International Commission on Illumination，CIE)色度图；
图2B示出U轴的色差值变化示意图；
图2C示出V轴的色差值变化示意图；
图3示出一种未使用调光元件的背光模组的装置示意图；
图4示出使用调光元件以及未使用调光元件的光强度的比较图；
图5示出不同油墨浓度所形成的调光元件对导光板的入光处与反入光处的色度差的影响；
图6A示出依照本发明第二实施方式的一种显示装置的装置示意图；
图6B示出依照本发明第二实施方式的另一种显示装置的装置示意图；
图6C示出依照本发明第二实施方式的导光板色度与第一显示面板色度以及第二显示面板色度之间的差值示意图；
图6D示出依照本发明第二实施方式的要求色度与第一导光板色度以及第二导光板色度之间的差值示意图；
图7示出一种未使用调光元件的显示装置的装置示意图；
图8示出依照本发明第三实施方式的一种背光模组的装置示意图；
图9示出依照本发明第四实施方式的一种背光模组的装置示意图
图10示出依照本发明第五实施方式的一种背光模组的装置示意图；
图11示出依照本发明第六实施方式的一种背光模组的装置示意图；以及
图12示出依照本发明第七实施方式的一种背光模组的装置示意图。
具体实施方式
请参照图1A及图1B，其示出依照本发明第一实施方式的一种背光模组的装置示意图及俯视图。本实施方式的背光模组100包括光源120、导光板140、调光元件160以及光源反射片180。导光板140具有入光面141、出光面143以及底面145。出光面143与底面145相对，且入光面141连接出光面143和底面145。在实施例中，导光板140通过光学胶130 与光源120连接。如图1A以及图1B所示，光源反射片180设置在导光板140的底面145下方且位于导光板140靠近入光面141的一侧，调光元件160则设置在底面145与光源反射片180之间。因此，光源120所产生的部分光线可直接从入光面141进入导光板140而从出光面143射出，光源120所产生的另一部分光线则可经调光元件160反射后，再从导光板140的底面145进入导光板140，而从出光面143射出。
请同时参照图1A、图1C以及图2A，其中图1C示出依照本发明第一实施方式的光源色度与第一导光板色度和第二导光板色度之间的差值示意图，图2A示出1931年CIE色度图。其中，图2A中的460nm～770nm表示光波长。如图1A所示，光源120所产生的光线能够测量出光源色度(chromaticity)。该光源色度可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。而且，光源120所产生的光线在经过调光元件160作用并从导光板140射出后，导光板140的出光面143可测量出第一导光板色度。该第一导光板色度同样可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。其中，如图1C所示，第一导光板色度与光源色度间具有第一差值D1或D1′。也就是说，光源120所产生的光线具有第一颜色，而从导光板140的出光面143射出的光线具有第二颜色，且第二颜色与第一颜色不相同。
另请同时参照图2A以及图3，其中图3示出一种未使用调光元件的背光模组的装置示意图。图3所示的背光模组200包括前述的光源120、导光板140以及光源反射片180，但并不包括如图1A以及图1B所示的调光元件160。在背光模组200中，光源120所产生的部分光线可直接从入光面141进入导光板140而从出光面143射出，光源120所产生的另一部分光线则直接经由光源反射片180反射后再从导光板140的底面145进入导光板140，而从出光面143射出。因此，光源120所产生的光线在未经过调光元件160作用而从导光板140射出后，导光板140的出光面143可测量出第二导光板色度。该第二导光板色度同样可由图2A所示1931年的CIE色度图上的其中一点所代表的色度坐标来表示。请再次参阅图1C所示，在本实施例中，第二导光板色度与光源色度间具有第二差值D2。也 就是说，在不具有调光元件160的情况下，在导光板140的出光面143所测量的光线具有第三颜色，该第三颜色与第一颜色不相同，与第二颜色也不相同。
如图1C所示，在实施例中，第一差值D1或D1′与第二差值D2不同。在本实施例中，第一差值D1或D1′小于第二差值D2。一般而言，光源120所产生的光线在未经过调光元件160作用而从导光板140射出后，会产生色偏(第二差值D2)。在有调光元件160的情况下，经导光板140入光的光线颜色与从出光面143出光的光线颜色的色差值(第一差值D1或D1′)较小，即色偏程度较小。因此，调光元件160的作用在于降低入光与出光间的色度差值，并改善光源120所产生的光线在经过导光板140后所产生的色偏问题。需要说明的是，本说明书所指的“色偏”是指第二差值D2所产生的色偏，通常指一般人通过肉眼可以察觉的色偏。而在此所指的第一差值D1或D1′较小，是指色偏程度较小，且一般人无法用肉眼直接看出的色偏(或可视为没有色偏)。一般而言，产品在使用或组装过程中均会产生误差，因此第一差值D1或D1′是依据使用者(或客户厂商)需求而设定的可接受的合理范围。
在本实施例中，调光元件160同样具有颜色，且该调光元件160的颜色同样可由图2A所示1931年的CIE色度图上的其中一点所代表的色度坐标来表示。因此，光源120所产生的光线在经过调光元件160的作用后，可改变光线从导光板140的出光面143射出后的颜色。
在实施例中，调光元件160的颜色为光源色度所代表颜色的互补色。可通过如下方式来选择互补色，即在如图2A所示的CIE色度图中画一条通过白色区域中其中一点P0的线段，例如线段A1，且该线段A1的两端不位于白色区域中。该线段的两端点所在的色度坐标所代表的颜色为互补色。以图2A的线段A1为例，线段A1的两端点分别为蓝色以及黄绿色，代表蓝色与黄绿色为互补色。也就是说，假设要将偏蓝色的光线调整为点P0所表示的白光，就必须要使用偏黄绿色的调光元件160。而且，调光元件160颜色的深浅也可决定偏蓝色的光线的改变幅度。也就是说，线段A1的两端到点P0的距离可依据颜色的深浅来调整。
请同时参照图2B及图2C，图2B及图2C分别示出U轴及V轴的色差值变化示意图。在示范性的例子中，在不具有调光元件160的情况下，如图2B及图2C所示的线条U1及线条V1表示在靠近入光处的U值和V值较小，而靠近反入光处的U值和V值则变大，导致色差值较大。在使用调光元件160后，如图2B及图2C所示的线条U2及线条V2所示，可使靠近入光处的原本较低的U值和V值提升至较高的U值和V值，且在离入光处一段距离后的U值和V值与靠近入光处的U值和V值差距不会太大。由此可知，调光元件160的使用可以明显改善入光处的色偏问题，也不会过度影响后端的色差状况。
请同时参照图1A、图3及图4，其中图4示出一种使用调光元件以及未使用调光元件的光强度的比较图。在未使用调光元件160的情况下，如图4所示的曲线L1，光源120所产生的光线为白光偏蓝。在使用黄色的调光元件160的情况下，光源120所产生的光线经过调光元件160反射后，可呈现不偏蓝光(或偏黄光)的效果((如图4所示的曲线L2所示)。在图4的例子中，当光源120所产生的光线为白光偏蓝时，使用黄色加红色的调光元件160，可相对于未使用调光元件160的架构使蓝光波长的能量降低8.5％并且使绿光能量降低5.6％。由此，通过调光元件160降低背光模组100入光处的蓝光能量和绿光能量，以提升背光模组100入光处的色度U值和V值，达到降低色差值的目的。需要说明的是，光源120所产生的光线为白光偏蓝且调光元件160为黄色仅用于示范说明，并非用以限制本发明。在其他实施例中，调光元件160的颜色根据光源120所产生的光线颜色或是根据光源120所产生的光线进入导光板140后的颜色来设计。
请参照图1A所示，在本实施例中，调光元件160设置在光源反射片180上，并且位于导光板140的底面145与光源反射片180之间。在一些例子中，调光元件160可为油墨所形成的薄膜，其可直接通过贴附的方式贴在光源反射片180上，或可直接通过印刷涂布而形成于光源反射片180上。
请同时参照图1A及图5，其中图5示出不同油墨浓度所形成的调光元件对导光板的入光处与反入光处的色度差的影响。在一些例子中，不同浓 度的油墨所形成的调光元件160对于光源120所产生的光线影响效果不同。例如，调光元件160的油墨浓度越高，导光板140的入光处与反入光处的色度差值就越小。例如浓度为4％的油墨所形成的调光元件160所产生的导光板140入光处与反入光处的色度差值小于浓度为1％的油墨所形成的调光元件160所产生的导光板140入光处与反入光处的色度差值。
请同时参照图6A及图6C，图6A示出依照本发明第二实施方式的一种显示装置的装置示意图，图6C示出依照本发明第二实施方式的导光板色度与第一显示面板色度及第二显示面板色度之间的差值示意图。当图1A所示的背光模组100应用至显示装置300中时，如前所述，光源120所产生的光线在经过调光元件160作用并从导光板140射出后，导光板140的出光面143可测量出导光板色度。该导光板色度同样可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。当光线从导光板140的出光面143射出后，直接进入设置在导光板140前方的显示面板310中，再从显示面板310出光。此时，如图6C所示，显示面板310还可测量出第一显示面板色度。该第一显示面板色度同样可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。其中，第一显示面板色度与导光板色度间具有第一差值D3或D3′。也就是说，从导光板140的出光面143所射出的光线具有第一颜色，而显示面板310射出的光线具有第二颜色，且第二颜色与第一颜色并不相同。另请参照6B，其示出依照本发明第二实施方式的另一种显示装置的装置示意图。图1A所示的背光模组100还可应用到如图6B所示的显示装置300′中。图6B所示的显示装置300′的结构大致上与图6A所示的显示装置300相同，故于此不再赘述。
另请同时参照图3及图7，其示出一种未使用调光元件的显示装置的装置示意图。当图3所示的背光模组200应用到显示装置400中时，由于背光模组200并不包括如图1A所示的调光元件160，因此光源120所产生的部分光线可直接从入光面141进入导光板140而从出光面143射出。当光线从导光板140的出光面143射出后，直接进入设置在导光板140前方的显示面板310中，再从显示面板310出光。此时，显示面板310还可测 量出第二显示面板色度。该第二显示面板色度同样可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。在不具有调光元件160的情况下，导光板140的出光面143射出的光线在经过显示面板310后具有第三颜色。请再次参阅图6C所示，在本实施例中，第二显示面板色度与导光板色度间具有第二差值D4，即该第三颜色与经调光元件160调光后自导光板140出射的光线的第一颜色并不相同，且与第二颜色也不相同。
如图6C所示，在本实施例中，第一差值D3或D3′小于第二差值D4。也就是说，在具有调光元件160的情况下，导光板140的出光面143射出的光线再经过显示面板310后的色偏情形比不具有调光元件160的情况下小。同样地，调光元件160具有颜色，且调光元件160的颜色根据前述不具有调光元件160情况下测量到的第二显示面板色度来设计。因此，光源120所产生的光线在经过调光元件160的作用后，可改变光线从导光板140的出光面143以及从显示面板310射出后的颜色。
由此可知，在不具有调光元件160的情况下，光源120所产生的光线本身具有光源色度，而从导光板140出光后的光线具有导光板色度，且从导光板140的出光面143射出而进入显示面板310且自显示面板310射出的光线也具有显示面板色度。这些色度彼此间差值越大，代表其色偏越严重。因此，可以这些色度作为参考值来设计调光元件160的颜色，以降低这些色度之间的差值。以图2A的线段A1为例，假设要将偏蓝色的光线调整为点P0所表示的白光，则可选择使用偏黄绿色的调光元件160。此外，调光元件160的颜色深浅也可依据到点P0的距离大小而变化。
另一方面，使用者(或厂商客户)还可提出显示装置的要求色度，通过调光元件160可调整显示装置的出光色度，以接近使用者(或厂商客户)所提出的要求色度或与其相同。请同时参照图6A及图6D所示，图6D示出依照本发明第二实施方式的要求色度与第一导光板色度及第二导光板色度之间的差值示意图。在具有调光元件160的情况下，光源120所产生的光线在经过调光元件160反射而从导光板140射出后，导光板140的出光面143可测量出第一导光板色度。该第一导光板色度同样可由图 2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。假设从导光板140射出的光线在经过显示面板310而出光后的色度不变，则该第一导光板色度与要求色度之间具有第一差值D5或D5′。又如图6D及图7所示，在不具有调光元件160的情况下，光源120所产生的光线从导光板140射出后，导光板140的出光面143可测量出第二导光板色度。该第二导光板色度同样可由图2A所示的1931年CIE色度图上的其中一点所代表的色度坐标来表示。假设从导光板140射出的光线在经过显示面板310而出光后的色度不变，则该第二导光板色度与要求色度之间具有第二差值D6。其中，在本实施例中，第一差值D5或D5′小于第二差值D6。也就是说，第一差值D5或D5′越小，则代表导光板色度越接近使用者(或厂商客户)所提出的要求色度。以图2A为例，假设点P0所表示的颜色光线为使用者(或厂商客户)所提出的要求色度，且第二导光板色度为偏蓝色。此时，由线段A1可知，可选择偏黄绿色的调光元件160来使得偏蓝色的光线改变为接近点P0所表示的颜色(也就是第一导光板色度)。此外，调光元件160的颜色深浅也可依据到点P0的距离大小而变化。
本发明中，调光元件还可有不同的设置位置。请参照图8，其示出依照本发明第三实施方式的一种背光模组的装置示意图。在本实施方式中，背光模组500包括光源520、导光板540以及调光元件560。导光板540具有入光面541、出光面543及底面545。出光面543与底面545相对，且入光面541连接出光面543与底面545。如图8所示，光源520包括电路板521以及多个设置在电路板521上的发光二极管523，其中发光二极管523与电路板521电连接。导光板540的底面545的一部分通过光学胶530黏贴在电路板521上。在本实施例中，调光元件560设置在电路板521上，并且位于导光板540的底面545靠近入光面541的一侧。因此，发光二极管523所产生的部分光线可直接从入光面541进入导光板540而从出光面543射出，发光二极管523所产生的另一部分光线则可经调光元件560反射后再从导光板540的底面545进入导光板540，而从出光面543射出。需要说明的是，调光元件560的功能和结构设计与前述调光元件160的功能和结构设计相同，故在此不赘述。
另请参照图9，其示出依照本发明第四实施方式的一种背光模组的装置示意图。在本实施例中，背光模组600的结构大致上与背光模组500相同，差异仅在于光源520的电路板521设置在导光板540的出光面543上。也就是说，导光板540的出光面543的一部分是通过光学胶530黏贴于光源520的电路板521上。在本实施例中，调光元件560设置在电路板521上，并且位于导光板540的出光面543靠近入光面141的一侧。因此，发光二极管523所产生的部分光线可直接从入光面541进入导光板540而从出光面543射出，发光二极管523所产生的另一部分光线则可在进入导光板540后先经调光元件560反射后再从出光面543射出，进而可达到与前述调光元件160相同的效果。
请参照图10，其示出依照本发明第五实施方式的一种背光模组的装置示意图。在本实施方式中，背光模组700包括背板710、光源720、导光板730、第一调光元件740、第二调光元件750以及光源反射片760。如图10所示，导光板730通过光学胶771黏贴在背板710上。光源反射片760设置在导光板730的底面735下方且靠近入光面731的一侧，第一调光元件740则设置在底面735与光源反射片760之间。光源720包括电路板721以及多个设置在电路板721上的发光二极管723。光源720的电路板721设置在导光板730的出光面733上，且导光板730的出光面733的一部分通过光学胶773黏贴于光源720的电路板721上。在本实施例中，第二调光元件750设置在电路板721上，并且位于导光板730的出光面733靠近入光面731的一侧。因此，发光二极管723所产生的部分光线可经第一调光元件740反射后再从出光面733射出，另一部分光线则可在进入导光板730后经第二调光元件750反射后再从出光面733射出，同样可达到与前述调光元件160相同的效果。
本发明中，调光元件还可直接设计成光学胶形式。请参照图11，其示出依照本发明第六实施方式的一种背光模组的装置示意图。在本实施方式中，背光模组800包括光源820、导光板840以及调光元件860。导光板840具有入光面841、出光面843及底面845。出光面843与底面845相对，且入光面841连接出光面843与底面845。如图8所示，光源820包 括电路板821以及多个设置在电路板821上的发光二极管823，其中发光二极管823与电路板821电连接。需要说明的是，本实施方式的调光元件860本身为光学胶，且具有黏性。因此，导光板840的底面845的一部分可直接通过调光元件860黏贴在电路板821上。在实施例中，调光元件860设置在电路板821上，并且位于导光板840的底面845靠近入光面841的一侧。
请继续参照图11，调光元件860同样具有颜色，且此调光元件860的颜色同样可由图2A所示1931年的CIE色度图上的其中一点所代表的色度坐标来表示。因此，发光二极管823所产生的部分光线可直接从入光面841进入导光板840而从出光面843射出，发光二极管823所产生的另一部分光线则可经调光元件860反射后再从导光板840的底面845进入导光板840，而从出光面843射出。因此，光源820所产生的光线在经过调光元件860的作用后，可改变光线从导光板840的出光面843射出后的颜色。在本实施例中，光源820的电路板821设置在导光板840的底面845上。在其他实施例中，光源820的电路板821可设置在导光板840的出光面843上。也就是说，导光板840的出光面843的一部分通过调光元件860黏贴于光源820的电路板821上。
本发明中，调光元件还可有不同的设置位置。请参照图12，其示出依照本发明第七实施方式的一种背光模组的装置示意图。在本实施方式中，背光模组900包括光源920、导光板940、扩散片960以及调光元件980。导光板940具有入光面941、出光面943及底面945。出光面943与底面945相对，且入光面941连接出光面943与底面945。如图12所示，光源920包括电路板921以及多个设置在电路板921上的发光二极管923，其中发光二极管923与电路板921电连接。导光板940的底面945一部分通过光学胶930黏贴在电路板921上。
请继续参照图12，在本实施例中，扩散片960设置在导光板940的出光面943上，且扩散片960的数量为多个，其中，最下层的扩散片960的一侧是延伸超过导光板940的入光面941。调光元件980设置在最下层的扩散片960的底面与导光板940的出光面943之间，较佳地，调光元件 980在最下层的扩散片960的一侧延伸超过导光板940的入光面941，并覆盖发光二极管923的一部分。因此，发光二极管923所产生的部分光线可直接从入光面941进入导光板940而从出光面943射出，发光二极管923所产生的另一部分光线则可经调光元件980反射后再进入导光板940，而后从出光面943射出。需要说明的是，调光元件980的功能和结构设计与前述调光元件160的功能和结构设计相同，故在此不赘述。
由上述本发明实施方式可知，本发明通过设置调光元件来降低光源色度与导光板的出光色度之间、导光板出光色度与显示面板的出光色度之间、或导光板的出光色度与要求色度之间的色度差值，进而降低并改善光源与导光板之间、导光板与显示面板之间或导光板与要求色度之间的色偏。
虽然本发明已经通过实施方式进行如上公开，但是这些实施方式并非用以限定本发明，任何本领域的技术人员，在不脱离本发明的精神和范围内，应当可以作出各种更动与润饰，因此本发明的保护范围根据所附权利要求书所限定的范围为准。
【符号说明】
100    背光模组
120    光源
130    光学胶
140    导光板
141    入光面
143    出光面
145    底面
160    调光元件
180    光源反射片
200    背光模组
300    显示装置
300′  显示装置
310    显示面板
400    显示装置
500    背光模组
520    光源
521    电路板
523    发光二极管
540    导光板
541    入光面
543    出光面
545    底面
560    调光元件
600    背光模组
700    背光模组
710    背板
720    光源
721    电路板
723    发光二极管
730    导光板
740    第一调光元件
750    第二调光元件
760    光源反射片
771    光学胶
773    光学胶
800    背光模组
820    光源
821    电路板
823    发光二极管
840    导光板
841    入光面
843    出光面
845    底面
860    调光元件
900    背光模组
920    光源
921    电路板
923    发光二极管
930    光学胶
940    导光板
941    入光面
943    出光面
945    底面
960    扩散片
980    调光元件
A1     线段
D1     第一差值
D1′   第一差值
D2     第二差值
D3     第一差值
D3′   第一差值
D4     第二差值
D5     第一差值
D5′   第一差值
D6     第二差值
P0     点
L1     曲线
L2     曲线
U1     线条
U2     线条
V1     线条
V2     线条

Claims (18)

  1. 一种背光模组，所述背光模组包括：
    光源，所述光源产生的光线能够测量出光源色度；
    导光板，所述导光板具有入光面和出光面，所述光源产生的光线经由所述入光面进入到所述导光板，再由所述出光面射出；以及
    调光元件；
    其中，在具有所述调光元件的情况下，所述导光板的所述出光面能够测量出第一导光板色度，所述第一导光板色度与所述光源色度之间具有第一差值；
    相比之下，在不具有所述调光元件的情况下，所述导光板的所述出光面能够测量出第二导光板色度，所述第二导光板色度与所述光源色度之间具有第二差值，且所述第一差值不同于所述第二差值。
  2. 根据权利要求1所述的背光模组，其中，所述导光板还具有与所述出光面相对的底面，所述调光元件位于所述导光板的所述底面下方和/或所述导光板的所述出光面上方，且位于所述导光板靠近所述入光面的一侧。
  3. 根据权利要求1所述的背光模组，还包括设置在所述导光板的底面的光源反射片，其中所述调光元件设置在所述光源反射片与所述底面之间，且位于所述导光板靠近所述入光面的一侧。
  4. 根据权利要求1所述的背光模组，其中，
    所述光源还包括电路板和设置在所述电路板上的多个发光二极管；以及
    所述调光元件设置在所述电路板与所述导光板之间，且位于所述导光板靠近所述入光面的一侧。
  5. 根据权利要求1所述的背光模组，还包括设置在所述导光板的所述出光面上的扩散片，其中所述调光元件设置在所述扩散片的底面与所述出光面之间。
  6. 根据权利要求5所述的背光模组，其中，所述扩散片和所述调光元件的一侧延伸超过所述导光板的所述入光面。
  7. 根据权利要求1所述的背光模组，其中，所述调光元件为油墨形成的薄膜。
  8. 根据权利要求4所述的背光模组，其中，所述调光元件为具有颜色的光学胶，其用于将所述导光板黏贴于所述电路板上。
  9. 一种显示装置，其包括：
    根据权利要求1至8中任一项权利要求所述的背光模组；以及
    显示面板，所述显示面板位于所述导光板的所述出光面前方。
  10. 一种显示装置，所述显示装置包括：
    光源；
    导光板，所述导光板具有入光面和出光面，所述光源产生的光线经由所述入光面进入到所述导光板，再由所述出光面射出；
    显示面板，所述显示面板位于所述导光板的所述出光面前方；以及
    调光元件；
    其中，在具有所述调光元件的情况下，所述导光板的所述出光面能够测量出导光板色度，所述显示面板能够测量出第一显示面板色度，所述导光板色度与所述第一显示面板色度之间具有第一差值；
    相比之下，在不具有所述调光元件的情况下，所述显示面板能够测量出第二显示面板色度，所述第二显示面板色度与所述导光板色度之间具有第二差值，且所述第一差值小于所述第二差值。
  11. 一种显示装置，所述显示装置包括：
    光源；
    导光板，所述导光板具有入光面和出光面，所述光源产生的光线经由所述入光面进入到所述导光板，再由所述出光面射出；
    显示面板，所述显示面板位于所述导光板的所述出光面前方；以及
    调光元件；
    其中，在具有所述调光元件的情况下，所述导光板的所述出光面能够测量出第一导光板色度，所述第一导光板色度与要求色度之间具有第一差值；
    相比之下，在不具有所述调光元件的情况下，所述导光板的所述出光 面能够测量出第二导光板色度，所述第二导光板色度与所述要求色度之间具有第二差值，且所述第一差值小于所述第二差值。
  12. 根据权利要求10或11所述的显示装置，其中，所述导光板还具有与所述出光面相对的底面，所述调光元件位于所述导光板的所述底面下方和/或所述导光板的所述出光面上方，且位于所述导光板靠近所述入光面的一侧。
  13. 根据权利要求10或11所述的显示装置，还包括设置在所述导光板的底面的光源反射片，其中，所述调光元件设置在所述光源反射片与所述底面之间。
  14. 根据权利要求10或11所述的显示装置，其中，
    所述光源还包括电路板以及设置在所述电路板上的多个发光二极管；以及
    所述调光元件设置在所述电路板与所述导光板之间。
  15. 根据权利要求10或11所述的显示装置，其中，所述调光元件为具有颜色的光学胶，其用于将所述导光板黏贴于所述电路板上。
  16. 根据权利要求10或11所述的显示装置，其中，所述调光元件为油墨形成的薄膜。
  17. 根据权利要求10或11所述的显示装置，还包括设置在所述导光板的所述出光面上的扩散片，其中，所述调光元件设置在所述扩散片的底面与所述出光面之间。
  18. 根据权利要求17项所述的显示装置，其中，所述扩散片和所述调光元件的一侧延伸超过所述导光板的所述入光面。
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US20170160460A1 (en) 2017-06-08
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JP2018530129A (ja) 2018-10-11
US10151868B2 (en) 2018-12-11

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