WO2010137479A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
- Publication number
- WO2010137479A1 WO2010137479A1 PCT/JP2010/058258 JP2010058258W WO2010137479A1 WO 2010137479 A1 WO2010137479 A1 WO 2010137479A1 JP 2010058258 W JP2010058258 W JP 2010058258W WO 2010137479 A1 WO2010137479 A1 WO 2010137479A1
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- WIPO (PCT)
- Prior art keywords
- light
- liquid crystal
- crystal display
- light emitting
- display panel
- Prior art date
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 50
- 238000005286 illumination Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 5
- 230000010287 polarization Effects 0.000 abstract description 8
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Images
Classifications
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- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
Definitions
- the present invention relates to a liquid crystal display panel and a liquid crystal display device having a light emitting element such as a light emitting diode for illuminating the liquid crystal display panel.
- Such a vehicle head-up display 1 projects the display light L onto a transflective plate called a vehicle windshield or combiner to display a virtual image.
- the vehicle head-up display 1 includes a liquid crystal display device 4 and a reflecting mirror 5 housed in a housing 3 having a translucent window 2.
- the display light L emitted from the liquid crystal display device 4 is reflected by the reflecting mirror. 5 is reflected and projected onto the windshield or combiner (see FIG. 5).
- the liquid crystal display device 4 includes a liquid crystal display panel 6 and light emitting diodes 7 and 8 that transmit and illuminate the liquid crystal display panel 6.
- the light emitting diodes 7 and 8 emit light when supplied with a predetermined power from a drive circuit (not shown).
- the light emitting diode 7 emits green light L1 and the light emitting diode 8 emits red light L2.
- the liquid crystal display panel 6 is transmitted and illuminated with illumination light L3 in which green light L1 emitted from the light emitting diode 7 and red light L2 emitted from the light emitting diode 8 are mixed.
- the illumination light L3 may not have a desired chromaticity but may have a slightly strong green color or a slightly strong red color. It was.
- a color sensor for detecting the chromaticity of the illumination light L3 is provided, and the voltage applied to the light-emitting elements 7 and 8 is adjusted according to the chromaticity data output from the color sensor, so that the illumination light L3. It is conceivable to always set the chromaticity of the desired chromaticity.
- the present invention provides a liquid crystal display device in which a liquid crystal display panel is uniformly transmitted and illuminated, and the display light L has a desired chromaticity.
- the present invention relates to a liquid crystal display panel 18, an illuminating means 19 that emits illumination light L3 that illuminates the liquid crystal display panel 18, a polarizing member 27 that reflects the illumination light L3, and the illumination light that has passed through the polarizing member 27.
- the present invention also provides the liquid crystal display panel 18, the first light emitting element 20 that emits the first light L1 having the first color, and the second light emitting element that emits the second light L2 having the second color.
- illumination means 19 for illuminating the liquid crystal display panel 18 with illumination light L3 including the first light L1 and the second light L2, a polarizing member 27 for reflecting the illumination light L3, and the polarization
- a detecting means 28 for detecting the illumination light L4 transmitted through the member 27 and outputting chromaticity data, and at least one of the first light emitting element 20 and the second light emitting element 21 based on the chromaticity data.
- Control means 56 for adjusting the power to be supplied.
- the polarizing member 27 is composed of a wire grid polarizer.
- the detection means detects the chromaticity of the illumination light transmitted through the polarizing member, the illumination light is not blocked by the detection means, the liquid crystal display panel is uniformly transmitted and illuminated, and the display light L has the desired chromaticity. become.
- FIG. 1 is a schematic view of a head-up display showing an embodiment of the present invention. Sectional drawing which shows embodiment same as the above. The side view of the liquid crystal display device which shows embodiment same as the above. The block diagram which shows embodiment same as the above. Sectional drawing which shows a prior art example.
- the head-up display 11 is disposed in the dashboard 12 of the vehicle (see FIG. 1).
- the display light L projected by the head-up display 11 is reflected by the windshield 13 to the observer 14.
- the observer 14 can visually recognize the virtual image V superimposed on the landscape.
- the head-up display 11 has a liquid crystal display device 15, a reflector 16 and the like housed in a housing 17.
- the liquid crystal display device 15 includes a liquid crystal display panel 18, an illuminator 19 (illuminating means), a polarizing member 27, a color sensor 28 (detection element), and a condenser lens 29.
- the liquid crystal display panel 18 has a polarizing plate attached to both front and rear surfaces of a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates on which a transparent electrode film is formed, and displays the vehicle speed digitally.
- the illuminator 19 includes a light emitting diode 20 (first light emitting element), a light emitting diode 21 (second light emitting element), circuit boards 22 and 23, condenser lenses 24 and 25, and a dichroic mirror 26. Have.
- the light emitting diode 20 emits green light L1 (first light), and the light emitting diode 20 is mounted on the circuit board 22.
- the light emitting diode 21 emits red light L2 (second light), and the light emitting diode 21 is mounted on the circuit board 23.
- the condensing lenses 22 and 23 are made of a translucent resin such as polycarbonate, and are disposed to face the light emitting diode 20 and the light emitting diode 21, respectively.
- the dichroic mirror 26 is inclined and transmits the green light L1 emitted from the light emitting diode 20, and reflects the red light L2 emitted from the light emitting diode 21.
- the liquid crystal display panel 18 is transmitted and illuminated by the orange light L3 (illumination light) in which the green light L1 and the red light L2 are mixed by the dichroic mirror 26.
- the polarizing member 27 is made of a wire grid polarizing plate, and reflects the polarization component of the orange light L3 in a predetermined direction (for example, a direction perpendicular to the paper surface).
- the polarizing plate on the rear surface side of the liquid crystal display panel 18 has a polarization axis in the predetermined direction.
- the color sensor 28 detects the chromaticity of a part L4 of the orange light L3 that has passed through the polarizing member 27, and outputs chromaticity data to a microcomputer that will be described later.
- the condensing lens 29 condenses a part L4 of the orange light L3 transmitted through the polarizing member 27 on the color sensor 28.
- a part L4 of the orange light L3 is a polarization component that cannot contribute to the illumination of the liquid crystal display panel 18.
- the reflector 16 includes a concave mirror 30, a holding member 31, and a stepping motor 32.
- the concave mirror 30 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 30a.
- the reflecting surface 30a is a concave surface, and the display light L emitted from the liquid crystal display device 15 is enlarged to display the virtual image V.
- the concave mirror 30 is bonded to the holding member 31 with a double-sided adhesive tape.
- the holding member 31 is made of resin (for example, ABS), and the gear portion 34 and the shaft portion 35 are integrally formed.
- the shaft portion 35 of the holding member 31 is pivotally supported by the housing 17.
- a gear 37 is attached to the rotation shaft of the stepping motor 32, and the gear 37 is meshed with the gear portion 34 of the holding member 31.
- the concave mirror 30 is supported so as to be rotatable together with the holding member 31, and the projection direction of the display light L can be adjusted by rotating the concave mirror 30 by the stepping motor 32.
- the observer 14 adjusts the angle of the concave mirror 30 by operating a push button switch (not shown) so that the display light L is reflected to the position of the eye (that is, the virtual image V can be visually recognized).
- the housing 17 houses the liquid crystal display device 15 and the reflector 16.
- the housing 17 is provided with a window portion 44 from which the display light L is emitted.
- the window portion 44 is made of a translucent resin (for example, acrylic) and has a curved shape.
- the housing 17 is provided with a light shielding wall 17c to prevent a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display device 15 and the virtual image V becomes difficult to see.
- the light shielding wall 17 c has a flat plate shape and is formed so as to hang obliquely from the upper part of the housing 17.
- FIG. 4 is a block diagram showing an electrical configuration of the liquid crystal display device 15.
- a speed sensor 51 detects the speed of the vehicle and outputs speed data to the microcomputer 52.
- the color sensor 28 outputs chromaticity data to the microcomputer 52.
- the microcomputer 52 outputs a drive signal to the liquid crystal display panel 18 via the drive circuit 53 to display the vehicle speed on the liquid crystal display panel 18, and to the light emitting diodes 20 and 21 via the drive circuits 54 and 55.
- a drive signal is output to cause the light emitting diodes 20 and 21 to emit light.
- the control means 56 is composed of a microcomputer 52 and drive circuits 54 and 55, and based on the chromaticity data output from the color sensor 28, the light emitting diodes 20 and 20 are controlled so that the orange light L3 has a desired chromaticity.
- the drive voltage applied to 21 is adjusted.
- the chromaticity of the orange light L3 is detected by the color sensor 28 using a part L4 of the orange light L3 transmitted through the polarizing member 27, and the chromaticity data output from the color sensor 28 is used.
- the chromaticity of the display light L becomes a desired chromaticity, and the color sensor 28 does not block the orange light L3. Uniform transmission illumination.
- the present invention is not limited to this embodiment, and various modifications are possible.
- two types of light emitting diodes 20 and 21 having different emission colors are used.
- three types of light emitting diodes having different emission colors may be used.
- the present invention is applied to a liquid crystal display device having a liquid crystal display panel and a light emitting element such as a light emitting diode for illuminating the liquid crystal display panel.
- Liquid crystal display panel 20 Light emitting diode (first light emitting element) 21 Light emitting diode (second light emitting element) 27 Polarizing member 28 Color sensor (detection element) 56 Control means L1 Green light (first light) L2 Red light (second light) L3 Orange light (illumination light)
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (AREA)
- Combustion & Propulsion (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Liquid Crystal (AREA)
- Instrument Panels (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Polarising Elements (AREA)
Abstract
液晶表示パネルが均一に透過照明され、且つ、表示光Lが所望の色度になる液晶表示装置を提供する。 照明手段19は、第一の色を有する第一の光L1を発する第一の発光素子20及び第二の色を有する第二の光L2を発する第二の発光素子21を備え、第一の光L1及び第二の光L2を含む照明光L3で液晶表示パネル18を照明する。偏光部材27は、照明光L3を反射させる。検出手段28は、偏光部材27を透過した照明光L4を検出し、色度データを出力する。制御手段56は、色度データに基づいて、第一の発光素子20及び第二の発光素子21の少なくとも一方に供給する電力を調整する。偏光部材27は、ワイヤグリッド偏光板からなる。
Description
本発明は、液晶表示パネル及びこの液晶表示パネルを照明する発光ダイオード等の発光素子を有する液晶表示装置に関するものである。
従来より、液晶表示装置を用いた車両用ヘッドアップディスプレイが種々提案されており、例えば特許文献1に開示されている。斯かる車両用ヘッドアップディスプレイ1は、表示光Lを車両のフロントガラス或いはコンバイナと称される半透過板に投影し、虚像を表示するものである。車両用ヘッドアップディスプレイ1は、透光性の窓部2を備えたハウジング3に液晶表示装置4及び反射鏡5を収容したものであり、液晶表示装置4が発した表示光Lは、反射鏡5で反射されてフロントガラス或いはコンバイナに投影される(図5参照)。
液晶表示装置4は、液晶表示パネル6及びこの液晶表示パネル6を透過照明する発光ダイオード7,8を有するものである。発光ダイオード7,8は、図示しない駆動回路から所定の電力を供給されて発光するものであり、発光ダイオード7は緑色光L1を発し、発光ダイオード8は赤色光L2を発する。液晶表示パネル6は、発光ダイオード7が発した緑色光L1と発光ダイオード8が発した赤色光L2とが混色された照明光L3で透過照明される。
しかしながら、周囲温度によって発光ダイオード7,8の発光輝度が各々変化するため、照明光L3が所望の色度ではなく、やや緑色が強かったり、やや赤色が強かったりすることがあるという問題を有していた。この問題を解決するため、照明光L3の色度を検出するカラーセンサを設け、このカラーセンサが出力する色度データに応じて発光素子7,8に印加する電圧を調整して、照明光L3の色度を常に所望の色度にすることが考えられる。しかし、カラーセンサを発光ダイオード7,8と液晶表示パネル6の間に配置した場合、カラーセンサによって照明光Lが遮られ、液晶表示パネル6が均一に透過照明されなくなる虞があった。
本発明は、液晶表示パネルが均一に透過照明され、且つ、表示光Lが所望の色度になる液晶表示装置を提供するものである。
本発明は、液晶表示パネルが均一に透過照明され、且つ、表示光Lが所望の色度になる液晶表示装置を提供するものである。
本発明は、液晶表示パネル18と、前記液晶表示パネル18を照明する照明光L3を発する照明手段19と、前記照明光L3を反射させる偏光部材27と、前記偏光部材27を透過した前記照明光L3の色度を検出する検出手段28と、を有するものである。
また、本発明は、液晶表示パネル18と、第一の色を有する第一の光L1を発する第一の発光素子20及び第二の色を有する第二の光L2を発する第二の発光素子21を備え、前記第一の光L1及び前記第二の光L2を含む照明光L3で前記液晶表示パネル18を照明する照明手段19と、前記照明光L3を反射させる偏光部材27と、前記偏光部材27を透過した前記照明光L4を検出し、色度データを出力する検出手段28と、前記色度データに基づいて前記第一の発光素子20及び前記第二の発光素子21の少なくとも一方に供給する電力を調整する制御手段56と、を有するものである。
また、本発明は、前記偏光部材27は、ワイヤグリッド偏光板からなるものである。
検出手段は偏光部材を透過した照明光の色度を検出するため、検出手段によって照明光が遮られることがなく、液晶表示パネルが均一に透過照明され、且つ、表示光Lが所望の色度になる。
以下、添付の図面に基づいて、本発明の一実施形態について説明する。ヘッドアップディスプレイ11は車両のダッシュボード12内に配設されている(図1参照)。ヘッドアップディスプレイ11が投射する表示光Lはフロントガラス13により観察者14に反射される。観察者14は虚像Vを風景と重畳させて視認することができる。
ヘッドアップディスプレイ11は、液晶表示装置15,反射器16等をハウジング17に収容したものである。液晶表示装置15は、液晶表示パネル18と、照明器19(照明手段)と、偏光部材27と、カラーセンサ28(検出素子)と、集光レンズ29とを有している。
液晶表示パネル18は、透明電極膜が形成された一対の透光性基板に液晶を封入した液晶セルの前後両面に偏光板を貼着したものであり、車両の速度をデジタル表示するものである。
照明器19は、発光ダイオード20(第一の発光素子)と、発光ダイオード21(第二の発光素子)と、回路基板22,23と、集光レンズ24,25と、ダイクロイックミラー26と、を有している。
照明器19は、発光ダイオード20(第一の発光素子)と、発光ダイオード21(第二の発光素子)と、回路基板22,23と、集光レンズ24,25と、ダイクロイックミラー26と、を有している。
発光ダイオード20は、緑色光L1(第一の光)を発するものであり、発光ダイオード20は、回路基板22に搭載されている。発光ダイオード21は、赤色光L2(第二の光)を発するものであり、発光ダイオード21は、回路基板23に搭載されている。集光レンズ22,23は、ポリカーボネート等の透光性樹脂からなるものであり、夫々、発光ダイオード20及び発光ダイオード21に対向して配置されている。ダイクロイックミラー26は、傾斜配置されており、発光ダイオード20が発した緑色光L1を透過させ、発光ダイオード21が発した赤色光L2を反射させる。ダイクロイックミラー26によって緑色光L1と赤色光L2とが混色された橙色光L3(照明光)によって、液晶表示パネル18が透過照明される。
偏光部材27は、ワイヤグリッド偏光板からなるものであり、橙色光L3の所定方向(例えば紙面に垂直な方向)の偏光成分を反射させる。液晶表示パネル18の後面側の偏光板は、前記所定方向の偏光軸を有している。カラーセンサ28は、偏光部材27を透過した橙色光L3の一部L4の色度を検出すると共に、後述するマイコンに色度データを出力する。集光レンズ29は、偏光部材27を透過した橙色光L3の一部L4をカラーセンサ28に集光させる。なお、橙色光L3の一部L4は、液晶表示パネル18の照明に寄与できない偏光成分である。
反射器16は、凹面鏡30,保持部材31及びステッピングモータ32を有している。凹面鏡30は、樹脂(例えばポリカーボネート)に金属(例えばアルミニウム)を蒸着させ反射面30aを形成したものである。反射面30aは凹面となっており、液晶表示装置15が発した表示光Lが拡大されて虚像Vが表示される。凹面鏡30は保持部材31に両面粘着テープにより接着されている。保持部材31は樹脂(例えばABS)からなるものであり、歯車部34及び軸部35が一体に形成されている。保持部材31の軸部35はハウジング17に軸支されている。
ステッピングモータ32の回動軸には歯車37が取付けられており、この歯車37は、保持部材31の歯車部34と噛合されている。凹面鏡30は保持部材31と共に回動可能な状態で支持されており、ステッピングモータ32により凹面鏡30を回動させ、表示光Lの投射方向を調整することができる。観察者14は、押ボタンスイッチ(図示しない)を操作し表示光Lが目の位置に反射されるように(即ち、虚像Vを視認できるように)凹面鏡30の角度を調整する。
ハウジング17には液晶表示装置15及び反射器16が収容される。ハウジング17には表示光Lが出射する窓部44が設けられている。この窓部44は透光性樹脂(例えばアクリル)からなるものであり、湾曲形状になっている。ハウジング17には遮光壁17cが設けられており、太陽光等の外光が液晶表示装置15に入射し虚像Vが見えにくくなる現象(ウォッシュアウト)を防止している。遮光壁17cは平板形状になっており、ハウジング17の上部から斜めに垂下するように形成されている。
図4は液晶表示装置15の電気的構成を示すブロック図である。51は速度センサであり、この速度センサ51は車両の速度を検出し、マイコン52に速度データを出力する。カラーセンサ28はマイコン52に色度データを出力する。マイコン52は、駆動回路53を介して、液晶表示パネル18に駆動信号を出力し、液晶表示パネル18に車両の速度を表示させると共に、駆動回路54,55を介して、発光ダイオード20,21に駆動信号を出力し、発光ダイオード20,21を発光させる。制御手段56は、マイコン52と駆動回路54,55とからなるものであり、カラーセンサ28が出力した色度データに基づいて、橙色光L3が所望の色度になるように、発光ダイオード20,21に印加する駆動電圧を調整する。
本実施形態は、偏光部材27を透過した橙色光L3の一部L4にて橙色光L3の色度をカラーセンサ28にて検出するものであり、カラーセンサ28が出力した色度データに基づいて、発光ダイオード20,21に供給する電力を調整することにより、表示光Lの色度が所望の色度になり、且つ、カラーセンサ28が橙色光L3を遮ることがないため、液晶表示パネルが均一に透過照明される。
本発明は、本実施形態に限定されるものではなく、種々の変形が可能である。例えば、本実施形態は、発光色が異なる2種類の発光ダイオード20,21を用いたものであったが、例えば、発光色が異なる3種類の発光ダイオードを用いても良い。
本発明は、液晶表示パネル及びこの液晶表示パネルを照明する発光ダイオード等の発光素子を有する液晶表示装置に適用されるものである。
18 液晶表示パネル
20 発光ダイオード(第一の発光素子)
21 発光ダイオード(第二の発光素子)
27 偏光部材
28 カラーセンサ(検出素子)
56 制御手段
L1 緑色光(第一の光)
L2 赤色光(第二の光)
L3 橙色光(照明光)
20 発光ダイオード(第一の発光素子)
21 発光ダイオード(第二の発光素子)
27 偏光部材
28 カラーセンサ(検出素子)
56 制御手段
L1 緑色光(第一の光)
L2 赤色光(第二の光)
L3 橙色光(照明光)
Claims (3)
- 液晶表示パネルと、前記液晶表示パネルを照明する照明光を発する照明手段と、前記照明光を反射させる偏光部材と、前記偏光部材を透過した前記照明光の色度を検出する検出手段と、を有することを特徴とする液晶表示装置。
- 液晶表示パネルと、
第一の色を有する第一の光を発する第一の発光素子及び第二の色を有する第二の光を発する第二の発光素子を備え、前記第一の光及び前記第二の光を含む照明光で前記液晶表示パネルを照明する照明手段と、
前記照明光を反射させる偏光部材と、
前記偏光部材を透過した前記照明光を検出し、色度データを出力する検出手段と、
前記色度データに基づいて前記第一の発光素子及び前記第二の発光素子の少なくとも一方に供給する電力を調整する制御手段と、
を有することを特徴とする液晶表示装置。 - 前記偏光部材は、ワイヤグリッド偏光板からなることを特徴とする請求項1または請求項2に記載の液晶表示装置。
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US13/260,871 US20120026425A1 (en) | 2009-05-29 | 2010-05-17 | Liquid crystal display apparatus |
EP10780434.6A EP2437104A4 (en) | 2009-05-29 | 2010-05-17 | LIQUID CRYSTAL DISPLAY DEVICE |
CN201080023230XA CN102449541A (zh) | 2009-05-29 | 2010-05-17 | 液晶显示装置 |
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JP2014194511A (ja) * | 2013-03-29 | 2014-10-09 | Funai Electric Co Ltd | ヘッドアップディスプレイ装置およびヘッドアップディスプレイ装置の表示方法 |
TWI583997B (zh) * | 2016-04-01 | 2017-05-21 | 揚昇照明股份有限公司 | 顯示箱 |
US11009640B2 (en) * | 2017-08-11 | 2021-05-18 | 8259402 Canada Inc. | Transmissive aerial image display |
JP7117578B2 (ja) | 2018-03-20 | 2022-08-15 | パナソニックIpマネジメント株式会社 | ヘッドアップディスプレイ及び移動体 |
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CN110031977A (zh) * | 2019-03-18 | 2019-07-19 | 惠州市华阳多媒体电子有限公司 | 一种基于偏振分光的双屏显示系统 |
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JP4903407B2 (ja) * | 2005-08-29 | 2012-03-28 | Necディスプレイソリューションズ株式会社 | 投射型表示装置の光の調整方法 |
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