JP2016049934A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device for a vehicle, which has good appearance without damaging visibility, according to an external light amount.SOLUTION: A display device 1 for a vehicle comprises: a transmission type liquid crystal panel 2; a semi-transmission type liquid crystal panel 3 arranged in parallel with the transmission type liquid crystal panel 2; external light amount detection means 5 for detecting an external light amount; and control means 4 for controlling display intensity of the transmission type liquid crystal panel 2 and the semi-transmission type liquid crystal panel 3 on the basis of the light amount detected by the external light amount detection means 5. The control means 4 increases the illumination brightness of the transmission type liquid crystal panel 2 and the semi-transmission type liquid crystal panel 3 according to the light amount, when the light amount detected by the external light amount detection means 5 is less than a predetermined light amount Th1, and on the other hand, when the light amount detected by the external light amount detection means 5 is equal to or more than the predetermined light amount Th1, increases the illumination brightness of the transmission type liquid crystal panel 2 according to the light amount, and reduces the illumination brightness of the semi-transmission type liquid crystal panel 3 according to the light amount.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle display device that performs light control according to the brightness of external light.

  Conventionally, Patent Document 1 discloses a liquid crystal display device that automatically adjusts the luminance of a backlight in accordance with ambient brightness.

  Patent Document 2 discloses a liquid crystal display device with high design in which a plurality of liquid crystal displays are integrated.

JP-A-4-352128 JP 2013-130777 A

  However, in the case of integrally configuring displays with different external light reflection characteristics, when adjusting the display brightness of each display according to the change in the amount of external light, one display and the other display There is room for improvement in that the visibility of one or the other display device may be impaired.

  The present invention has been made in view of the above-described situation, and an object thereof is to provide a display device for a vehicle that has a good appearance without impairing visibility according to the amount of external light.

A vehicle display device 1 according to the present invention includes:
A transmissive liquid crystal panel 2;
A transflective liquid crystal panel 3 juxtaposed with the transmissive liquid crystal panel 2;
An external light amount detecting means 5 for detecting the amount of external light;
A vehicle display device 1 comprising: control means 4 for controlling display luminance of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 based on a light quantity detected by the external light quantity detection means 5;
When the light quantity detected by the external light quantity detection means 5 is less than a predetermined light quantity Th1, the control means 4 determines the illumination brightness of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 according to the light quantity. Increase,
The control means 4 increases the illumination brightness of the transmissive liquid crystal panel 2 in accordance with the light quantity when the light quantity detected by the external light quantity detection means 5 is equal to or greater than a predetermined light quantity Th1, and the semi-transmissive liquid crystal The illumination brightness of the panel 3 is reduced according to the light quantity.

Preferably, the control means 4 of the vehicle display device 1 according to the present invention is configured such that the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 have dark background images 20B and 30B and a light vehicle information image. First instrument images 20 and 30 combined with 20F and 30F are displayed,
The control means 4 replaces the first instrument image 20 displayed on the transmissive liquid crystal panel 2 when the light quantity detected by the external light quantity detection means 5 is not less than another predetermined light quantity Th2, instead of the first instrument image 20 A second instrument image 21 obtained by inverting the brightness of the first instrument image 20 is displayed.

Preferably, the vehicle information image 30 of the transflective liquid crystal panel 3 of the vehicle display device 1 of the present invention includes at least a traveling speed of the vehicle,
The vehicle information images 20 and 21 of the transmissive liquid crystal panel 2 are configured by vehicle information different from the vehicle information image 30 of the transflective liquid crystal panel 3.

Preferably, the vehicle display device 1 of the present invention has a protective panel 6,
The transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 are integrally bonded to the protective panel 6 via a bonding layer 61,
The protective panel 6 has a black light shielding layer 60 at a position not corresponding to the transmissive liquid crystal panel 3 and the transflective liquid crystal panel 2 on the back surface.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus for vehicles with good appearance can be provided, without impairing visibility according to external light quantity.

The front view (a) which shows embodiment of this invention, and sectional drawing (b) in AA. The electrical block diagram of the embodiment. The figure which shows the 1st display form (a) and the 2nd display form (b) of the embodiment. The figure which shows the light control of the same embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  A vehicle display device 1 according to the present invention includes a transmissive liquid crystal panel 2, a transflective liquid crystal panel 3, a circuit board 4, an external light amount detecting means 5, a protective panel 6, a case body 7, and a frame body. 8.

  The transmissive liquid crystal panel 2 is composed of, for example, a transmissive TFT color liquid crystal module having a backlight light source, and shines an image displayed on the liquid crystal by the light from the backlight light source and visually recognizes the image. It is.

  The transflective liquid crystal panel 3 is composed of, for example, a transflective segment liquid crystal module with a separate backlight source, and has a transflective reflector on the back surface of the liquid crystal layer of the segment liquid crystal module. In addition to shining the image displayed on the liquid crystal layer by reflecting the external light irradiated from the display surface, the image displayed on the liquid crystal layer is also shined by the light of the backlight source irradiated from the back surface to make the image visible It is a liquid crystal panel.

The circuit board 4 includes, for example, a light source 40 serving as a backlight light source for illuminating the transflective liquid crystal panel 3 from the back surface on a substrate in which a wiring pattern made of copper foil is formed on a base material made of glass epoxy resin, and a transmissive liquid crystal panel. Various electronic components such as an arithmetic element for controlling the display of 2 and the transflective liquid crystal panel 3 and the light emission luminance of the backlight source are mounted.
Also, the circuit board (control means) 4 stores various vehicle information such as the traveling speed of the vehicle, the engine speed, the total traveling distance, and the operation state of the cruise control device mounted on the vehicle, such as a CAN (Controller Area Network). The vehicle information input means LAN for inputting based on the communication specifications of the vehicle and an external light quantity detection means 5 described later are electrically connected, and a transmissive liquid crystal panel is provided in accordance with inputs from the vehicle information input means LAN and the external light quantity detection means 5. 2 and the display luminance of the transflective liquid crystal panel 3 and the emission luminance of the backlight light source of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 are variably controlled.

  The external light quantity detecting means 5 is composed of, for example, a phototransistor that detects a light quantity by amplifying a photocurrent generated by light irradiation by a transistor action, and is externally received by the display surfaces of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3. It is installed at a position where it can receive light.

  The protective panel 6 is a protective plate that protects the display surfaces of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3, and has functions such as antireflection, antifouling, antistatic, and infrared cut on the front or back surface, for example. Made of a flat-plate-shaped inorganic glass on which a protective protective layer is formed.

  On the back surface of the protective panel 6, a light shielding layer 60 made of a black print layer is formed at a position not corresponding to the display surface of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3, and is covered with the light shielding layer 60. The part which is present does not transmit light from the back surface of the protective panel 6.

On the back surface of the protective panel 6, the display surfaces of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 are juxtaposed and bonded by a bonding layer 61.
The bonding layer 61 is, for example, a light transmissive resin having a refractive index of about 1.4 to 1.55 by UV irradiation of a liquid photocurable resin having a viscosity of about 2500 to 5000 mPa · s (millipascal second). It is hardened to resin. The bonding layer 61 absorbs a difference in expansion and contraction due to a difference in linear expansion coefficient between the adhesive surface of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 and the protective panel 6 and is elastic enough to prevent the adhesive surface from peeling off. In order to have an adhesive force, it may be composed of a light-transmitting resin having curing characteristics such as photocuring properties and thermosetting properties such as silicon, urethane, and acrylic.

  The case body 7 is made of an opaque resin such as acrylonitrile ethylene propylene diene styrene (AES) or polypropylene (PP), and accommodates the transmissive liquid crystal panel 2, the semi-transmissive liquid crystal panel 3, and the circuit board 4.

  The frame body 8 is made of, for example, a metal such as stainless steel or iron, and the protective panel 6 and the case body 7 are fastened and fixed.

  Next, the display of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 by the circuit board 4 and the variable control of the light emission luminance of the backlight light source will be described with reference to FIGS.

The circuit board 4 receives various vehicle information such as the vehicle travel speed, engine speed, total travel distance, operation state of the cruise control device mounted on the vehicle, input from the vehicle information input means LAN, background image and vehicle The instrument images 20 and 30 obtained by combining the information images are displayed on the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3, respectively.
In the present embodiment, the circuit board 4 causes the transflective liquid crystal panel 3 to display the instrument image (first instrument image) 30 composed of the vehicle information image 30F composed of the traveling speed and the total traveling distance of the vehicle and the background image 30B. The transmissive liquid crystal panel 2 displays a meter image (first instrument image) 20 composed of a vehicle information image 20F composed of the remaining fuel amount, the gear position, and the operating state of the cruise control device, and a background image 20B.

  Further, the background images 20B and 30B of the instrument images 20 and 30 are configured with a dark color made of black, for example, whereas the vehicle information images 20F and 30F are made of a light color made of white and the like. Thereby, the boundary between the light shielding layer 60 and the transmissive liquid crystal panel 2 of the protective panel 6 and the boundary between the light shielding layer 60 of the protective panel 6 and the transflective liquid crystal panel 3 becomes inconspicuous. Vehicle information images 20F and 30F composed of a bright color with high contrast between the background images 20B and 30B and the dark color of the light shielding layer 60, can be seen as one display surface with a sense of unity Display can be made.

  Further, the circuit board 4 varies the light emission luminance of the backlight light sources of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 as shown in FIG. 4 according to the external light quantity input from the external light quantity detection means 5. .

  More specifically, the circuit board 4 is used for a vehicle in which the external light quantity input from the external light quantity detection means 5 is less than a predetermined light quantity Th1 (for example, 2000 lux), that is, at night to dawn, or from twilight to night. In an environment where the external light amount that illuminates the display device 1 is low, the light emission luminance of each of the backlight light sources of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 is increased according to the external light amount.

  In addition, the circuit board 4 has an external light quantity input from the external light quantity detection means 5 that is equal to or greater than a predetermined light quantity Th1, that is, in an environment where the external light quantity that illuminates the daytime vehicle display device 1 is sufficiently high. The light emission luminance of the backlight source of the transmissive liquid crystal panel 2 is increased in accordance with the amount of external light, while the light emitted from the backlight source of the transflective liquid crystal panel 3 is illuminated with an image displayed on the liquid crystal layer by external light. The brightness is decreased.

  With this configuration, the vehicle has a good appearance without impairing the visibility of the instrument images 20 and 30 displayed on the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3 regardless of changes in the external light environment. The display device 1 can be provided.

  In addition, the circuit board 4 applies the change in the light emission luminance of the backlight light source with a delay from the change in the light emission luminance of the backlight light source according to the external light amount described above with respect to the change in the external light amount. This is because when the external light quantity changes suddenly in a predetermined short period of time, such as when passing through a shade, while the vehicle is running, the light emission luminance change of the backlight light source changes rapidly and the transmissive liquid crystal panel 2 and the semi-transmissive This prevents the visibility of the liquid crystal panel 3 from being impaired.

  Further, the circuit board 4 displays the vehicle display device 1 when the external light amount input from the external light amount detection means 5 is equal to or more than another predetermined light amount Th2 (for example, 100,000 lux), that is, when the day is sunny. In an environment where the amount of external light to illuminate is extremely high, instead of the instrument image 20 consisting of the background image 20B composed of the dark color and the vehicle information image 20F composed of the light color displayed on the transmissive liquid crystal panel 2, light and dark are displayed. An instrument image (second instrument image) composed of the inverted background image 21B and vehicle information image 21F is displayed.

  By configuring in this way, the contrast of the vehicle information image 21 can be appropriately maintained even in an external light environment where the transmissive liquid crystal panel 2 can emit light or higher, so that it can be seen without impairing visibility. Can be provided.

  In addition, as in the present embodiment, out of the transmissive liquid crystal panel 2 and the transflective liquid crystal panel 3, the traveling speed of the vehicle that is particularly important as vehicle information is illuminated outside the vehicle display device 1 during sunny daytime. Providing the display device 1 for a vehicle with high visibility regardless of changes in the ambient light environment by displaying on the transflective liquid crystal panel 3 that can maintain high visibility even in an environment where the amount of light is very high. Is preferable.

  As mentioned above, although embodiment which concerns on this invention was described, it can implement with a various form, without being limited to the said embodiment.

  For example, the backlight light source 40 of the transflective liquid crystal panel 3 does not have to be configured separately from the transflective liquid crystal panel 3, and the transflective liquid crystal panel 3 is configured as a module having the backlight light source 40. Also good.

  INDUSTRIAL APPLICABILITY The present invention is suitable as a vehicle display device mounted on a vehicle, a motorcycle, or a mobile body equipped with an agricultural machine or a construction machine.

1: Display device for vehicle 2: Transmission type liquid crystal panel 20: Instrument image (first instrument image)
20B: Background image 20F: Vehicle information image 21: Instrument image (second instrument image)
21B: Background image 21F: Vehicle information image 3: Transflective liquid crystal panel 30: Instrument image (first instrument image)
30B: Background image 30F: Vehicle information image 4: Circuit board 40: Light source 5: External light quantity detection means 6: Protection panel 60: Light shielding layer 61: Bonding layer 7: Case body 8: Frame body LAN: Vehicle information input means Th1: Predetermined light quantity Th2: Other predetermined light quantity

Claims (4)

A transmissive LCD panel;
A transflective liquid crystal panel juxtaposed with the transmissive liquid crystal panel;
An external light amount detection means for detecting the amount of external light;
Control means for controlling display luminance of the transmissive liquid crystal panel and the transflective liquid crystal panel based on the amount of light detected by the external light amount detecting means, and a vehicle display device comprising:
The control means increases the illumination brightness of the transmissive liquid crystal panel and the semi-transmissive liquid crystal panel according to the light quantity when the light quantity detected by the external light quantity detection means is less than a predetermined light quantity,
The control means increases the illumination brightness of the transmissive liquid crystal panel according to the light quantity when the light quantity detected by the external light quantity detection means is greater than or equal to a predetermined light quantity, and the illumination brightness of the transflective liquid crystal panel Is reduced according to the light quantity. A vehicle display device. The control means displays a first instrument image combining a dark background image and a light vehicle information image on the transmissive liquid crystal panel and the transflective liquid crystal panel,
The control means replaces the first instrument image displayed on the transmissive liquid crystal panel when the light quantity detected by the external light quantity detection means is equal to or greater than another predetermined light quantity. The vehicular display device according to claim 1, wherein the second instrument image in which the brightness is inverted is displayed. The vehicle information image of the transflective liquid crystal panel includes at least a traveling speed of the vehicle,
The vehicle display device according to claim 1, wherein the vehicle information image of the transmissive liquid crystal panel is configured by vehicle information different from the vehicle information image of the transflective liquid crystal panel. . Has a protective panel,
The transmissive liquid crystal panel and the transflective liquid crystal panel are integrally bonded to the protective panel via a bonding layer,
4. The vehicle according to claim 1, wherein the protective panel has a black light-shielding layer at a position not corresponding to the transmissive liquid crystal panel and the transflective liquid crystal panel on the back surface. Display device.

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