WO2020046386A1 - Unités d'affichage - Google Patents

Unités d'affichage Download PDF

Info

Publication number
WO2020046386A1
WO2020046386A1 PCT/US2018/049200 US2018049200W WO2020046386A1 WO 2020046386 A1 WO2020046386 A1 WO 2020046386A1 US 2018049200 W US2018049200 W US 2018049200W WO 2020046386 A1 WO2020046386 A1 WO 2020046386A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
light
region
display unit
rms roughness
Prior art date
Application number
PCT/US2018/049200
Other languages
English (en)
Inventor
Li Fang LIM
Swee Siang LIM
Shiol Lin Jasmine TAY
Ping Siew KWOK
Original Assignee
Hewlett-Packard Development Company, L.P.
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 Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2018/049200 priority Critical patent/WO2020046386A1/fr
Publication of WO2020046386A1 publication Critical patent/WO2020046386A1/fr

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F23/00—Advertising on or in specific articles, e.g. ashtrays, letter-boxes
    • G09F23/0058—Advertising on or in specific articles, e.g. ashtrays, letter-boxes on electrical household appliances, e.g. on a dishwasher, a washing machine or a refrigerator

Definitions

  • Display units may be touch-sensitive.
  • the display units may display icons that when touched by a finger or a stylus, enable operations associated with the icons.
  • Such a display unit may be back-lit display unit.
  • FIG. 1 illustrates a display unit according to an example
  • FIG. 2 illustrates a display unit, according to an example
  • FIG. 3 illustrates a device with a display unit, according to an example.
  • a display unit may be implemented in a device, such as a printer, to display information.
  • the information may be displayed on a viewing surface of tire display unit.
  • the information may indicate an operation state of foe device. In case of a printer, the operation state may indude“printing”,“paper jam", and“no paper*.
  • display units may be touch-sensitive display units.
  • a touch-sensitive display unit may display an icon on a viewing surface of foe display unit.
  • the icon may be a symbol, or a mark, associated with an operation that can be performed by the device in which foe display unit is implemented.
  • a user interaction with the icon may initiate the associated operation in foe device.
  • the Interaction may be enabled by an object, such as a finger or a stylus.
  • the display units as described above may be back-lit display units.
  • light from a light source is guided using a light guide to illuminate a viewing surface of the display unit from underneath.
  • the light source may include a light emitting diode (LED).
  • the light guide may be a planar light guide, cuboidai in shape, having two planar surfaces and four side surfaces. One of the planar surfaces is interfaced with the viewing surface of the display unit.
  • the light source of the display unit may be placed such that light from the light source is incident on one of the side surfaces of toe light guide and propagates inside the light guide based on total internal reflection.
  • the light may be directed out to illuminate the viewing surface, such as due to evanescent waves at toe planar surface interfaced with the viewing surface.
  • the icon embedded in the viewing surface may be displayed on the viewing surface.
  • the distribution of light directed towards the viewing surface by toe light guide may not be uniform, which results in a non-uniform illumination of toe viewing surface and the embedded icon.
  • the intensity of light, and thus toe illumination reduces as a function of distance away from toe light source. That is, toe intensity of light from regions of the light guide closer to the light source is higher than toe intensity of light from regions of the light guide farther from toe tight source.
  • the non-uniform distribution of intensity of light may be due to losses of light in and from toe light guide. The losses may include decaying, scattering, or refraction of light.
  • a light source with more than one LED may be used in toe display unit to compensate for toe loss of light
  • Use of a multi-LED light source in a display unit may cause heating inside toe display unit, which may damage components of toe display unit or of the device in which toe display unit is implemented.
  • reflective coatings may be deposited on a planar surface of the light guide, opposite to the planar surface interfacing with toe viewing surface of toe display unit, to increase the intensity of light which is directed to toe viewing surface.
  • Use of reflective coatings on toe light guide may impact the touch sensitivity of a touch-sensitive display unit
  • a display unit of toe present subject matter includes a light source and a light guide.
  • the light guide includes a substrate having two planar surfaces and four side surfaces.
  • the light source is arranged such that light from foe light source is incident on ate of the side surfaces of foe substrate.
  • a planar surface of the substrate is textured.
  • the other planar surface of the substrate, opposite to the textured planar surface, may not be textured.
  • the planar surface of the substrate is textured in such a manner that a region of the textured planar surface distal to the light source has a root-mean-square (RMS) roughness higher than that of a region of the textured planar surface proximal to the light source.
  • RMS roughness refers to a root-mean- square value of roughness measurements of microscopic peaks and valleys at the surface.
  • RMS roughness enables increase in scattering of light thereby increasing foe amount of light directed towards foe planar surface of foe substrate that is opposite of the textured planar surface.
  • the higher foe RMS roughness the higher the amount of light directed towards foe opposite planar surface.
  • Increase in foe amount of light from the distal region having foe higher RMS roughness may compensate for the loss of light that may otherwise occur as a function of distance away from the light source.
  • Increase in the amount of light from foe distal region having the higher RMS roughness to that from the proximal region having foe lower RMS roughness facilitates uniform illumination of a viewing surface interfacing with the light guide of the display unit.
  • the Illumination of the viewing surface of foe display unit may be uniform with a single LED fight source and without depositing ah additional reflective coating on the substrate of the light guide.
  • Fig. 1 illustrates a display unit 100, according to an example.
  • Hie display unit 100 may be implemented as a back-lit display unit for illuminating a viewing surface from underneath.
  • Hie display unit 100 may be used in a device, such as a printer, a multi-functional device, remote controllers, and the like.
  • Hie display unit 100 includes a light source 102.
  • Hie light source 102 may be a single LED light source which emits light of a peak wavelength in a visible frequency spectrum.
  • Hie display unit 100 also includes a light guide 104 with a substrate 106.
  • Hie substrate 106 is a planar substrate, like a solid cuboida! block, having two planar surfaces and four side surfaces.
  • the light guide 104 is placed with respect to the light source 102 so as to receive light from foe light source 102 and guide the received light towards a first planar surface 108 of foe substrate 106.
  • the light emitted by the light source 102 is depicted by arrows 110 and foe light directed towards the first planar surface 108 of the substrate 106 is depicted by arrows 112.
  • Hie substrate 106 has a second planar « «face 114, opposite to foe first planar surface 108, including a first region 116 with a first RMS roughness and a second region 118 with a second RMS roughness.
  • the second RMS roughness is higher than foe first RMS roughness.
  • the first RMS roughness of the first region 116 is in a range of 4 pm to 5 pm
  • foe second RMS roughness of foe second region 118 is in a range of 8 pm to 10 pm.
  • the first region 116 is proximal to foe light source 102, and the second region 118 is distal to the light source 102.
  • the first region 116 is closer to foe light source 102 and foe second region 118 is farther from foe light source 102, when viewed in a direction depicted by arrow 120.
  • the first region 116 may have a width, along a direction away from foe light source 102, in a range of 4 mm to 7 mm.
  • foe second region may have a width, along a direction away from the light source, in a range of 4 mm to 7 mm.
  • foe substrate 106 is made of a styrene- acrylonitrile (SAN) resin ora polycarbonate. In an example, the substrate 106 has a thickness equal to or less than 1.2 pm.
  • SAN styrene- acrylonitrile
  • foe light source 102 emits light and a portion of emitted light is incident on a side surface of the substrate 106. Some of foe light incident on the side surface of the substrate 106 refracts into the substrate 106. Some of the refracted light propagates inside the substrate 106 in the direction of arrow 120 due to total internal reflection. It may be noted that the intensity of light propagating inside the substrate 106 due to total internal reflection may reduce with distance away from the light source 102. Such a reduction may be due to decaying of light at interfeces formed by fee first planar surface 108 and fee second planar surface 114 and also due to light scattering in directions other than fee direction depicted by arrows 112.
  • the remaining of the refracted light inside fee substrate 106 scatters in the direction of arrows 112 due to texturing of fee second planar surface 114.
  • fee second region 118 distal to the light source 102 and having the second RMS roughness, scatters more amount of light in comparison to the first region 116, proximal to fee light source and having fee first RMS roughness.
  • the increase in the amount of light scattered by fee second region 118 compensates for fee reduction in the intensity of light propagating inside fee substrate 106 due to total internal reflection.
  • the light in fee direction of arrows 112 from the substrate 106 may be substantially uniform over fee width of the substrate 106 along fee direction of arrow 120.
  • fee side surfaces of fee substrate 106 may be polished to increase fee amount of light refracting into fee substrate 106.
  • the side surfaces may be grain polished. The polishing may be performed manually or by a machine.
  • fee substrate 106 may be fabricated using a molding process.
  • a mold of a shape and dimensions of fee substrate 106 is fabricated using an electric discharge machining (EDM) process, in fee process of fee fabrication of the mold, one region of the inner base surface of the mold is processed to have VDI#32 grade to VDi#34 grade roughness, and the other region of the inner base surface of fee mold is processed to VDi#38 grade to VDI#4Q grade roughness.
  • the region having fee roughness of VD!#32 grade to VDi#34 grade may have a width in a range of 4 mm to 7 mm.
  • the region having the roughness of VDI#38 grade to VDI#40 grade may have a width in a range of 4 mm to 7 mm.
  • the mold is used for fabricating the substrate 106 of a SAN resin or a polycarbonate.
  • Hie region of tiie inner base surface having the roughness of VDI#32 grade to VDi#34 grade results in the first region 116 of the first RMS roughness in a range of 4 pm to 5 pm.
  • the region of the inner base surface having the roughness of VDI#38 grade to VDI#40 grade results in the first region 118 of the second RMS roughness in a range of 8 pm to 10 pm.
  • Table 1 lists VDl# grade and the corresponding RMS roughness of a surface.
  • Fig. 2 illustrates a display unit 200, according to ah example.
  • the display unit 200 includes the light source 102 and the light guide 104.
  • the light guide 104 includes the substrate 106, as described with reference to Fig. 1.
  • the display unit 200 includes a touch-sensitive circuitry unit 202 and a touch membrane 204. As shown in Fig. 2, the light guide 104 is disposed on the touch- sensitive circuitry unit 202, and the touch membrane 204 is disposed on the light guide 104.
  • the light guide 104 is attached to the touch-sensitive circuitry unit 202 using an adhesive.
  • the adhesive may be an acrylic adhesive, in another example, a double-sided adhesive layer may be used.
  • the adhesive used may form a layer of a thickness in a range of 0.1 mm to 0.2 mm.
  • the touch membrane 204 is attached to the light guide 104 using ah adhesive.
  • the adhesive used for attaching the touch membrane 204 to toe light guide 104 may be the same as that used for attaching the light guide 104 to the touch-sensitive circuitry unit 202.
  • the light guide 104 indudes the substrate 106.
  • the substrate 106 is to receive light from the light source 102 (depicted by arrows 110 ⁇ and guide the received light towards the touch membrane 204 (depicted by arrows 112).
  • the substrate 106 has a textured surface 206 interfacing the touch- sensitive circuitry unit 202.
  • the textured surface 206 is the same as the second planar surface 114 and includes a first textured region 208 with a first RMS roughness, and a second textured region 210 with a second RMS roughness.
  • the first textured region 208 is proximal to the light source 102, and the second textured region 210 being distal to the light source 102.
  • die second RMS roughness is higher than the first RMS roughness, similar to as described earlier with reference to Fig. 1.
  • the first RMS roughness is in a range of 4 pm to 5 pm
  • die second RMS roughness is in a range of 8 pm to 10 pm.
  • the first textured region 208 has a width, along a direction away from the light source (shown by arrow 120), in a range of 4 mm to 7 mm.
  • the second textured region 210 has a width, along a direction away from the light source (shown by arrow 120). in a range of 4 mm to 7 mm.
  • the touch-sensitive drcuitry unit 202 may be a capacitive touch- based printed circuit board (RGB).
  • the touch-sensitive circuitry unit 202 is enabled to trigger an operation based on a touch-based input on the touch membrane 204.
  • the touch-based input may be provided by an object, such as a finger or a stylus.
  • the touch membrane 204 may be a transparent plastic membrane.
  • the touch membrane 204 may have a thickness in a range of 1.5 mm to 2.5 mm.
  • the touch membrane 204 is illuminated by die light of the light source 102 which is guided by the light guide 104.
  • a user may provide a touch-based input on tile illuminated touch membrane 204 to trigger the Operation by die touch- sensitive circuitry unit 202.
  • Fig. 3 illustrates a device 300 with a display unit 302, according to an example.
  • the device 300 may be a printer.
  • the display unit 302 indudes die light source 102 and the light guide 104.
  • the light guide 104 indudes die substrate 106, as described with reference to Fig. 1.
  • the display unit 302 indudes the touch-sensitive circuitry unit 202 and a touch membrane 304.
  • the light guide 104 is disposed on the touch-sensitive drcuitry unit 202, and the touch membrane 304 is disposed on the light guide 104.
  • the light guide 104 is attached to the touch-sensitive drcuitry unit 202 using an adhesive.
  • the touch membrane 304 is attached to the light guide 104 using an adhesive.
  • the adhesive may be an acrylic adhesive.
  • a double-sided adhesive layer may be used. The adhesive used may form a layer of a thickness in a range of 0.1 mm to 0.2 mm.
  • Hie touch membrane 304 may be a transparent plastic membrane.
  • the touch membrane 304 may have a thickness in a range of 1.5 mm to 2,5 mm.
  • the touch membrane 304 has an icon 306 embedded therein.
  • the icon 306 is embedded in the touch membrane 304 such that icon is visible when toe light source 102 is ON and is not visible otherwise.
  • the icon 306 may be a symbol, or a mark, associated with an operation that can be performed by toe device 300 having the display unit 302. In an example where toe device 300 is a printer, toe operation may be resume printing, stop printing, etc.
  • the light guide 104 includes the substrate 106.
  • the substrate 106 is to receive light from the light source 102 (depicted by arrows
  • the substrate 106 has a textured surface 206 interfacing toe touch- sensitive circuitry unit 202.
  • the textured surface 206 is toe same as the second planar surface 114 and includes a test textured region 208 with a first RMS roughness, and a second textured region 210 with a second RMS roughness.
  • the first textured region 208 is proximal to toe light source 102, and the second textured region 210 being distal to the light source 102.
  • toe second RMS roughness is higher than the first RMS toughness, similarto as described earlier with reference to Fig; 1.
  • the first RMS roughness is in a range of 4 pm to 5 pm
  • aid toe second RMS roughness is in a range of 8 pm to 10 pm.
  • the test textured region 208 has a width, along a direction away from the light source (shown by arrow 120), in a range of 4 mm to 7 mm.
  • toe second textured region 210 has a width, along a direction away from the light source (shown by arrow 120), in a range of 4 mm to 7 mm.
  • the touch membrane 304 is illuminated by the light of the tight source 102 which is guided by toe light guide 104 to display the icon 306,
  • a user may provide a touch-based input on toe icon 306 of toe illuminated touch membrane 304 to trigger the operation associated with the icon 306 by the touch- sensitive circuitry unit 202.

Abstract

L'invention concerne des exemples d'unités d'affichage. Dans un exemple, une unité d'affichage comprend une source de lumière et un guide de lumière. Le guide de lumière comprend un substrat. Une surface du substrat comprend une première région ayant une première rugosité moyenne quadratique (RMS), et une seconde région ayant une seconde rugosité RMS. La seconde rugosité RMS est supérieure à la première rugosité RMS. La première région est proximale par rapport à la source de lumière, et la seconde région est distale par rapport à la source de lumière.
PCT/US2018/049200 2018-08-31 2018-08-31 Unités d'affichage WO2020046386A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2018/049200 WO2020046386A1 (fr) 2018-08-31 2018-08-31 Unités d'affichage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2018/049200 WO2020046386A1 (fr) 2018-08-31 2018-08-31 Unités d'affichage

Publications (1)

Publication Number Publication Date
WO2020046386A1 true WO2020046386A1 (fr) 2020-03-05

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ID=69645291

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/049200 WO2020046386A1 (fr) 2018-08-31 2018-08-31 Unités d'affichage

Country Status (1)

Country Link
WO (1) WO2020046386A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001002772A1 (fr) * 1999-07-01 2001-01-11 3M Innovative Properties Company Ensemble d'affichage dote d'un guide optique frontal
US20110122094A1 (en) * 2009-11-25 2011-05-26 Coretronic Corporation Optical touch apparatus and optical touch display apparatus
US20110305002A1 (en) * 2007-07-31 2011-12-15 Michael Lim Illumination assembly including wavelength converting material having spatially varying density
US9952375B2 (en) * 2013-12-19 2018-04-24 Corning Incorporated Textured surfaces for display applications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001002772A1 (fr) * 1999-07-01 2001-01-11 3M Innovative Properties Company Ensemble d'affichage dote d'un guide optique frontal
US20110305002A1 (en) * 2007-07-31 2011-12-15 Michael Lim Illumination assembly including wavelength converting material having spatially varying density
US20110122094A1 (en) * 2009-11-25 2011-05-26 Coretronic Corporation Optical touch apparatus and optical touch display apparatus
US9952375B2 (en) * 2013-12-19 2018-04-24 Corning Incorporated Textured surfaces for display applications

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