JP2011221240A - Liquid crystal display panel, device including liquid crystal display panel, and irradiation method using liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display panel for improving the visibility of a notation character of a peripheral device in a dark place without affecting the amount of backlight or adding a lighting device.SOLUTION: A liquid crystal display panel 1 comprises a light emitting part 4 in which a light emitting diode element 2 for backlighting which emits light for back light and a UV-ray light emitting diode element 3 which emits UV ray in a predetermined wavelength region are disposed mixedly, and a control part 5 for individually controlling light emission of the light emitting diode element 2 for backlighting and light emission of the UV-ray light emitting diode element 3.

Description

  The present invention relates to a liquid crystal display panel incorporated in an information terminal device or the like, an apparatus including the liquid crystal display panel, and an irradiation method using the liquid crystal display panel.

  Some information terminal devices such as personal computers have a liquid crystal display (LCD) panel on a display screen and are operated from peripheral devices including a keyboard. Conventionally, cold cathode fluorescent lamps have been used as light sources for LCD panel backlights. Recently, however, LCD panels use light emitting diodes (LEDs) that consume less power than cold cathode fluorescent lamps. Has also increased.

  FIG. 9 is an exploded perspective view showing a structural example of a liquid crystal display panel using LEDs as a light source for backlight. The liquid crystal display (LCD) panel shown in FIG. 9 includes a liquid crystal panel 51, a backlight LED lamp 52, a light guide plate 53, a reflection plate 54, and frames 55 and 56. In the LCD panel shown in FIG. 9, the light emitted from the LEDs included in the backlight LED lamp 52 is reflected and refracted and diffused inside the light guide plate 53, and is used as backlight light for the liquid crystal panel 51. To be emitted.

  However, when such an information terminal device such as a personal computer is used at night or in a dark place such as a dark room, the character display and operation button notation of peripheral devices such as a keyboard are difficult to see. In order to do this, it was necessary to prepare an external illumination or a device having a backlight illumination in the display character portion. However, since the use of external illumination or backlight illumination entails power consumption, it has been a hindrance to long-time driving, particularly in devices that use batteries.

  Patent Document 1 describes a key top lighting device that improves operability in a dark place with low power consumption. The key top illumination device described in Patent Document 1 irradiates ultraviolet rays together with a backlight onto a key top on which a fluorescent material is printed by providing an ultraviolet filter in a part of the backlight light source.

JP 2004-47412 A (paragraphs 0031-0032, 0040-0041)

  However, in the key top lighting device described in Patent Document 1, since the ultraviolet light filter is provided in a part of the backlight light source, the amount of light as the backlight is reduced by the amount of light passing through the ultraviolet light filter. End up. Also, since the backlight light source and the ultraviolet light source are shared, if the brightness of the backlight is reduced, the amount of ultraviolet light also decreases, and it is not possible to secure the ultraviolet light that fluoresces the key top fluorescent material. There is sex.

  Therefore, the present invention relates to a liquid crystal display panel that improves the visibility of device notation in the dark without affecting the amount of light of the backlight and without adding a lighting device, a device including the liquid crystal display panel, and a liquid crystal An object is to provide an irradiation method using a display panel.

  A liquid crystal display panel according to the present invention includes a light emitting unit including a backlight light emitting diode element that emits light for backlight and an ultraviolet light emitting diode element that emits ultraviolet light in a predetermined wavelength range, and a backlight. And a controller for individually controlling the light emission of the light emitting diode element and the light emission of the ultraviolet light emitting diode.

  A device including a liquid crystal display panel according to the present invention includes a light emitting unit including a backlight light emitting diode element that emits light for backlight and an ultraviolet light emitting diode element that emits ultraviolet light in a predetermined wavelength range. And a liquid crystal display panel having a control unit for individually controlling the light emission of the light emitting diode element for the backlight and the light emission of the ultraviolet light emitting diode, and the surface from which the backlight is emitted by the light emitting part. And a device having a notation coated with a fluorescent paint that emits fluorescence in response to ultraviolet rays in a predetermined wavelength range.

  The irradiation method by the liquid crystal display panel according to the present invention is a method for emitting light for a backlight from an ultraviolet light emitting diode element that is mixed with a light emitting diode element for backlight that emits light for backlight in a light emitting portion of the liquid crystal display panel. Separately from the light emitted from the diode element, a fluorescent paint that emits ultraviolet light in a predetermined wavelength range by applying electrical control by the control unit and emits fluorescence in response to the ultraviolet light in the predetermined wavelength range is applied. The device having the notation is irradiated with emitted ultraviolet light.

  ADVANTAGE OF THE INVENTION According to this invention, the visibility of the description of an apparatus can be improved in a dark place, without affecting the light quantity of a backlight and without adding an illuminating device.

It is explanatory drawing which shows the structural example of the apparatus containing the liquid crystal display panel of 1st Embodiment by this invention. It is a disassembled perspective view which shows the structure of the LCD panel shown in FIG. It is a block diagram for demonstrating the mode of light emission of the LED lamp for backlights in the LCD panel shown in FIG. It is sectional drawing which shows the typical cross section of the LCD panel shown in FIG. It is a perspective view which shows an example of the apparatus containing the liquid crystal display panel of 2nd Embodiment by this invention. It is a perspective view which shows an example of the apparatus containing the liquid crystal display panel of 3rd Embodiment by this invention. FIG. 7 is a perspective view showing an example of an opened state of the mobile phone shown in FIG. 6. FIG. 3 is a block diagram illustrating a main part of a liquid crystal display panel according to the present invention. It is a disassembled perspective view which shows the structural example of the liquid crystal display panel which uses LED as the light source for backlights.

Embodiment 1. FIG.
FIG. 1 is an explanatory diagram showing a configuration example of a device including the liquid crystal display panel of the first embodiment (Embodiment 1) according to the present invention. With reference to FIG. 1, the apparatus containing the liquid crystal display panel 12 of 1st Embodiment by this invention is demonstrated.

  The monitor 11 is a liquid crystal display that uses a liquid crystal display (LCD) panel 12 as a display screen. The monitor 11 is connected to an information terminal device such as a personal computer, for example.

  The LCD panel 12 constitutes a display screen of the monitor 11. The front direction shown in FIG. 1 is the front side of the LCD panel 12. The configuration of the LCD panel 12 will be described later with reference to FIGS.

  The keyboard 13 is connected to an information terminal device such as a personal computer. The key top character of each key of the keyboard 13 is coated with a fluorescent paint that emits fluorescence in response to ultraviolet rays in a predetermined wavelength range. It is assumed that the keyboard 13 is arranged in the forward direction of the LCD panel 12 of the monitor 11, that is, on the front side of the LCD panel 12.

  The peripheral devices 14 and 15 are devices arranged around the monitor 11. On the surfaces of the peripheral devices 14 and 15, icons and characters for indicating functions are printed, and a fluorescent paint that emits fluorescence in response to ultraviolet rays in a predetermined wavelength range is applied. It is assumed that the peripheral devices 14 and 15 are arranged in front of the monitor 11, that is, on the front side of the LCD panel 12. Note that a fluorescent paint may be applied to the buttons and switches of the peripheral devices 14 and 15.

  The keyboard 13 and the peripheral devices 14 and 15 do not have to be separated from the LCD panel 12 as long as the keyboard 13 and the peripheral devices 14 and 15 are arranged on the front side of the LCD panel 12. .

  FIG. 2 is an exploded perspective view showing the structure of the LCD panel shown in FIG. The LCD panel 12 includes a liquid crystal panel 21, a backlight LED lamp 22, a light guide plate 23, a reflection plate 24, frames 25 and 26, ultraviolet LEDs 27, and a control unit (not shown).

  The backlight LED lamp 22 includes a plurality of backlight LED elements. The backlight LED lamp 22 includes a backlight LED element and an ultraviolet LED 27 as light sources. The ultraviolet LED 27 is an LED element that emits ultraviolet light (ultraviolet light) in a predetermined wavelength range. The ultraviolet LED 27 is provided in a mixed manner in the backlight LED element.

  The light emitted from the backlight LED element of the backlight LED lamp 22 becomes backlight light that irradiates the liquid crystal panel 21 from behind. The ultraviolet rays emitted from the ultraviolet LED 27 irradiate the liquid crystal panel 21 from behind together with the backlight light from the backlight LED element of the backlight LED lamp 22.

  FIG. 3 is a block diagram for explaining the state of light emission of the backlight LED lamp in the LCD panel shown in FIG. As shown in FIG. 3, the control unit 29 electrically controls how much light is emitted from each of the backlight LED elements 28 and the ultraviolet LED 27 of the backlight LED lamp 22. That is, the control unit 29 can control the backlight LED element 28 and the ultraviolet LED 27 separately. For example, the control unit 29 can perform control so as to keep the amount of light emitted by the ultraviolet LED 27 unchanged even when the amount of light emitted by the backlight LED element 28 is suppressed. At this time, the backlight light irradiated through the liquid crystal panel 21 becomes weak, but the intensity of the ultraviolet light emitted from the ultraviolet LED 27 through the liquid crystal panel 21 does not change.

  The light guide plate 23 diffuses the light from the backlight LED lamp 22. The reflection plate 24 reflects the light of the backlight LED lamp 22 diffused by the light guide plate 23. Frames 25 and 26 fix each member shown in FIG.

  4 is a cross-sectional view showing a schematic cross section of the LCD panel shown in FIG. As shown in FIG. 4, the light emitted from the backlight LED lamp 22 is reflected and refracted and diffused inside the light guide plate 33, and is emitted to the front side of the LCD panel 12 as backlight light of the liquid crystal panel 21. The

  Here, since the ultraviolet LED 27 is provided in a mixed manner in the LED elements of the backlight LED lamp 22, the ultraviolet light emitted from the ultraviolet LED 27 is also reflected and refracted and diffused inside the light guide plate 33. Along with light, the light is emitted in a wide range from the back side of the liquid crystal panel 21 to the front side of the LCD panel 12.

  Ultraviolet light (ultraviolet light) radiated from the display screen of the monitor 11 irradiates the keyboard 13 and peripheral devices 14 and 15 arranged in the front direction of the monitor 11. The ultraviolet rays irradiated from the display screen of the monitor 11 excite the fluorescent paint used for the key top characters of the keyboard 13 and the icons and characters of the peripheral devices 14 and 15. As a result, key top characters, icons, characters, etc. appear to emit light.

  As described above, in the LCD panel 12, an ultraviolet component can be mixed in the backlight light emitted to the front side of the LCD panel 12 by being mixed in the backlight LED lamp 22. The backlight light mixed with the ultraviolet component can make the characters on the key top of the keyboard 13 coated with the fluorescent paint emit light in a dark place without requiring external illumination or the like. Can be improved. In addition, since no external illumination is required, power consumption due to external illumination does not occur, and an energy saving effect can be expected.

  Further, in the LCD panel 12, ultraviolet light emitted from the ultraviolet LED 27 is diffused in the light guide plate 33 to radiate a wide range to the front side of the LCD panel 20, so that not only the key top of the keyboard 11 but also other peripheral devices. A sufficient amount of ultraviolet rays can be applied to the 14 and 15 icons and characters, and visibility can be improved.

  Further, in the LCD panel 12, the ultraviolet LED 27 is provided in the backlight LED element of the backlight LED lamp 22, so that the light amount of the backlight by the original backlight LED element 28 is not affected. A predetermined amount of ultraviolet light can be emitted.

  Further, since the control unit 29 can control the backlight LED element 28 and the ultraviolet LED 27 separately, even when the light intensity of the backlight LED element 28 is reduced to lower the luminance of the backlight, the ultraviolet LED 27. It is possible to perform control without changing the amount of light. At this time, the ultraviolet LED 27 can emit a sufficient amount of ultraviolet light to excite the fluorescent paint used for characters of peripheral devices, etc., irrespective of the brightness of the backlight.

Embodiment 2. FIG.
FIG. 5 is a perspective view showing an example of a device including the liquid crystal display panel of the second embodiment (Embodiment 2) according to the present invention. With reference to FIG. 5, the apparatus containing the liquid crystal display panel 32 of 2nd Embodiment by this invention is demonstrated.

  The personal computer 31 is, for example, a notebook personal computer, and includes a liquid crystal display (LCD) panel 32 as a display screen. The personal computer 31 also includes a keyboard 33 for performing user operations. The configuration of the LCD panel 32 is the same as the configuration of the LCD panel 12 shown in FIGS.

  The key top characters of the keyboard 33, notations of various functions, icons, and the like are printed using a fluorescent paint that emits fluorescence in response to ultraviolet rays in a predetermined wavelength range. Specifically, for example, not only key top characters but also identification characters of power supply and battery indicator lamps are printed using fluorescent paint.

  Hereinafter, an example of the operation of the personal computer 31 will be described.

  When the personal computer 31 is operating, ultraviolet rays are emitted from the LCD panel 32. The ultraviolet rays radiated from the LCD panel 32 excite fluorescent paint used for key top characters of the keyboard 33, notations of various functions, icons, and the like. Then, the key top characters of the keyboard 33, the notation characters of various functions, icons, and the like can be emitted in a dark place without mounting a light source for the backlight.

  In such a personal computer 31, since the key top characters of the keyboard 33, the written characters of various functions, icons, and the like emit light even in the dark, visibility can be improved. In addition, since the light source for the backlight of each key is not required, the power for the backlight of each key becomes unnecessary, and the reduction of power consumption in the personal computer 31 can be expected, which can contribute to the extension of the battery driving time.

Embodiment 3. FIG.
FIG. 6 is a perspective view showing an example of a device including the liquid crystal display panel of the third embodiment (Embodiment 3) according to the present invention. FIG. 7 is a perspective view showing an example of the opened state of the mobile phone shown in FIG. With reference to FIG. 6 and FIG. 7, the apparatus containing the liquid crystal display panel 42 of the 3rd Embodiment by this invention is demonstrated.

  The cellular phone 41 is a foldable cellular phone. FIG. 6 shows a folded state and FIG. 7 shows an opened state. The cellular phone 41 includes a liquid crystal display (LCD) panel 42 as a display screen. In addition, the mobile phone 41 includes an operation button 43 for performing an operation by the user. The configuration of the LCD panel 42 is the same as the configuration of the LCD panel 12 shown in FIGS.

  The key top characters of the keyboard 43, the notation characters of various functions, icons, and the like are coated with a phosphorescent paint that accumulates and emits ultraviolet rays in a predetermined wavelength range. Specifically, for example, phosphorescent paint is applied to key top characters, identification characters of indicator lamps for power batteries, and the like.

  Hereinafter, an example of the operation of the mobile phone 41 will be described.

  The folded mobile phone 41 turns on the LCD panel 42 as shown in FIG. 6, for example, when receiving a call or receiving an e-mail and making a ring tone. At this time, the LCD panel 42 turns on the ultraviolet LED 27 for a predetermined time and turns on the backlight with a predetermined light amount.

  As shown in FIG. 6, the mobile phone 41 whose backlight is turned on with the LCD panel 42 folded irradiates the operation button 43 with ultraviolet rays contained in the backlight. In the operation button 43 facing the LCD panel 42, in response to the irradiated ultraviolet light, the phosphorescent paint applied to the key top characters, the notation characters of various functions, the icons, and the like emits light after being accumulated.

  As shown in FIG. 7, when the cellular phone 41 is opened, the key top characters of the operation buttons 43, the notation characters of various functions, icons, and the like are in a light emitting state.

  Note that the mobile phone 41 is used not only when a call or e-mail is received but also when a predetermined condition indicating a situation where it is determined that the mobile phone 41 is likely to be opened is satisfied (for example, when an alarm is sounded). The ultraviolet LED 27 may be turned on. Further, the ultraviolet LED 27 may be turned on by a predetermined operation such as pressing a side key (not shown) of the mobile phone 41.

  In such a cellular phone 41, when the cellular phone 41 is opened and used, the key top characters of the operation buttons 43, notation characters and icons of various functions, and the like emit light without turning on the backlight of each button or the like. Therefore, visibility can be improved. Further, since the backlight light source such as each button is not used, the power for the backlight such as each button becomes unnecessary, and the power consumption in the cellular phone 41 can be expected to be reduced, which can contribute to the extension of the battery driving time.

  When the condition is met and the LCD panel 42 is turned on, the control unit of the mobile phone 41 does not emit the backlight LED element, but only the ultraviolet LED 27 emits light with a predetermined light amount for a predetermined time. It is good. In such a cellular phone 41, power consumption can be further reduced by not causing the backlight LED element to emit light.

  FIG. 8 is a block diagram showing a main part of the liquid crystal display panel according to the present invention. As shown in FIG. 8, the liquid crystal display panel 1 (for example, equivalent to the liquid crystal display panel 12 shown in FIG. 1) includes a backlight light emitting diode element 2 (for example, the backlight shown in FIG. 2) that emits light for backlight. Light emission provided by mixing a light emitting LED element 22 (corresponding to a backlight LED element of the light LED lamp 22) and an ultraviolet light emitting diode element 3 (for example, corresponding to the ultraviolet LED 27 shown in FIG. 2) that emits ultraviolet light in a predetermined wavelength range. Unit 4 (e.g., corresponding to the backlight LED lamp 22 shown in FIG. 2), and a control unit 5 (e.g., a first control unit 5) that individually controls the light emission of the light emitting diode element 2 for backlight and the light emission of the ultraviolet light emitting diode 3. Corresponding to the control unit of the liquid crystal display panel of the embodiment.

  In each of the above embodiments, a liquid crystal display panel or a device including the liquid crystal display panel as shown in the following (1) to (3) is also disclosed.

(1) A light emitting section provided with a mixture of a backlight light emitting diode element that emits light for backlight and an ultraviolet light emitting diode element that emits ultraviolet light in a predetermined wavelength range, and a light emitting diode element for backlight A liquid crystal display panel having a control unit for individually controlling the light emission of the LED and the light emission of the ultraviolet light emitting diode, the surface where the backlight is emitted by the light emitting unit, and the ultraviolet ray in a predetermined wavelength range emitted from the ultraviolet light emitting diode element. A device (for example, an implementation) comprising a liquid crystal display panel, characterized by comprising a device having a notation (for example, the key top characters of the keyboard 13 shown in FIG. 1) coated with a fluorescent paint that emits fluorescence upon reaction This is realized by the monitor 11 and the keyboard 13 in the first embodiment.)

(2) Notation (for example, figure) in which the device is applied with a phosphorescent paint that illuminates and emits ultraviolet rays in a predetermined wavelength range radiated from the ultraviolet light emitting diode element on the surface from which the backlight is radiated by the light emitting unit. 7 including a liquid crystal display panel provided with the key top characters of the operation buttons 43 shown in FIG. 7 (for example, realized by the mobile phone 41 of the third embodiment).

(3) The control unit of the liquid crystal display panel includes a liquid crystal display panel that causes the ultraviolet light emitting diode element to emit light when a predetermined condition (for example, when the mobile phone 41 of the third embodiment receives a call or an e-mail) is established. apparatus.

  The present invention can be applied to a personal computer, an information terminal device, or the like having a display screen used in a dark place such as a night or a dark room.

  In addition, if ultraviolet LEDs are mixed in a plurality of LEDs included in the LED lighting fixture, even when the illuminance of the LED lighting fixture is lowered, it reacts to the ultraviolet rays by the irradiation of the ultraviolet rays by the ultraviolet LED. Since it is possible to improve the visibility of letters and mark parts written using a fluorescent paint that fluoresces, the present invention can be applied to LED lighting devices and the like.

  Furthermore, if a phosphorescent paint is used for characters, even after the LED lighting apparatus is extinguished, characters or mark parts written using the phosphorescent paint can be allowed to emit light for a certain period of time.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Back light emitting diode element 3 Ultraviolet light emitting diode element 4 Light emission part 5 Control part 11 Monitor 12 Liquid crystal display panel 13 Keyboard 14,15 Peripheral device 21 Liquid crystal panel 22 LED lamp 23 for backlight 23 Light guide plate 24 Reflector 25, 26 Frame 27 UV LED
28 LED elements for backlight 29 Control unit 31 Personal computer 32 Liquid crystal display panel 33 Keyboard 41 Mobile phone 42 Liquid crystal display panel 43 Operation buttons 51 Liquid crystal panel 52 LED for backlight
53 Light guide plate 54 Reflector plate 55, 56 Frame

Claims (6)

A light emitting section provided with a mixture of a backlight light emitting diode element that emits light for backlight and an ultraviolet light emitting diode element that emits ultraviolet light in a predetermined wavelength range;
A liquid crystal display panel comprising: a control unit that individually controls light emission of the light emitting diode element for backlight and light emission of the ultraviolet light emitting diode. A light emitting section provided with a mixture of a backlight light emitting diode element that emits light for backlight and an ultraviolet light emitting diode element that emits ultraviolet light in a predetermined wavelength range, and light emission of the light emitting diode element for the backlight And a liquid crystal display panel having a control unit for individually controlling the light emission of the ultraviolet light emitting diode,
And a device having a notation in which a fluorescent paint that emits fluorescence in response to ultraviolet rays in a predetermined wavelength range emitted from the ultraviolet light emitting diode element is applied to a surface from which the backlight is emitted by the light emitting unit. A device including a liquid crystal display panel. The device is provided with a notation in which a phosphorescent paint that accumulates and emits ultraviolet light in a predetermined wavelength range emitted from the ultraviolet light emitting diode element is provided on a surface from which the backlight is emitted by the light emitting unit. An apparatus comprising the liquid crystal display panel according to Item 2. The apparatus including the liquid crystal display panel according to claim 3, wherein the control unit of the liquid crystal display panel causes the ultraviolet light emitting diode element to emit light when a predetermined condition is satisfied. In the light emitting part of the liquid crystal display panel, apart from the light emitted by the backlight light emitting diode element, from the ultraviolet light emitting diode element provided mixed with the light emitting diode element for backlight that emits light for backlight, Performs electrical control by the control unit to emit ultraviolet rays in a predetermined wavelength range,
An irradiation method using a liquid crystal display panel, comprising: irradiating a device having a notation coated with a fluorescent paint that emits fluorescence in response to ultraviolet light in the predetermined wavelength range. The liquid crystal display panel according to claim 5, wherein the liquid crystal display panel irradiates a device having a notation applied with a phosphorescent paint that stores and emits ultraviolet light in a predetermined wavelength range emitted from the ultraviolet light emitting diode element. Method.

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