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
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2015/099772
Other languages
English (en)
French (fr)
Chinese (zh)
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Radiant Opto Electronics Suzhou Co Ltd
Radiant Opto Electronics Corp
Original Assignee
Radiant Opto Electronics Suzhou Co Ltd
Radiant Opto Electronics Corp
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 Radiant Opto Electronics Suzhou Co Ltd, Radiant Opto Electronics Corp filed Critical Radiant Opto Electronics Suzhou Co Ltd
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
Anticipated expiration legal-status Critical
Priority to US16/158,293 priority patent/US10473843B2/en
Ceased legal-status Critical Current

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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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Planar Illumination Modules (AREA)
PCT/CN2015/099772 2015-10-09 2015-12-30 背光模组及显示装置 Ceased WO2017059644A1 (zh)

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JP2018517729A JP2018530129A (ja) 2015-10-09 2015-12-30 バックライトモジュール及び表示装置
US15/439,956 US10151868B2 (en) 2015-10-09 2017-02-23 Backlight module and display device
US16/158,293 US10473843B2 (en) 2015-10-09 2018-10-11 Backlight module and display device

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CN201510649146.3A CN106568029B (zh) 2015-10-09 2015-10-09 背光模组及显示装置

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TW201714001A (zh) 2017-04-16
US20170160460A1 (en) 2017-06-08
TWI666493B (zh) 2019-07-21
CN106568029A (zh) 2017-04-19
JP2018530129A (ja) 2018-10-11
CN106568029B (zh) 2020-10-30
TWI570484B (zh) 2017-02-11
US10151868B2 (en) 2018-12-11
US10473843B2 (en) 2019-11-12
TW201714000A (zh) 2017-04-16

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