WO2009104226A1 - Vehicle-mounted display device - Google Patents

Vehicle-mounted display device Download PDF

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Publication number
WO2009104226A1
WO2009104226A1 PCT/JP2008/003314 JP2008003314W WO2009104226A1 WO 2009104226 A1 WO2009104226 A1 WO 2009104226A1 JP 2008003314 W JP2008003314 W JP 2008003314W WO 2009104226 A1 WO2009104226 A1 WO 2009104226A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
power
power supply
signal
display device
Prior art date
Application number
PCT/JP2008/003314
Other languages
French (fr)
Japanese (ja)
Inventor
荒木幹夫
宮本浩明
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2009554139A priority Critical patent/JP4570686B2/en
Priority to DE112008003679T priority patent/DE112008003679B4/en
Priority to CN2008801212664A priority patent/CN101896857B/en
Publication of WO2009104226A1 publication Critical patent/WO2009104226A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
    • G09G2300/0482—Use of memory effects in nematic liquid crystals
    • G09G2300/0486—Cholesteric liquid crystals, including chiral-nematic liquid crystals, with transitions between focal conic, planar, and homeotropic states
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0469—Details of the physics of pixel operation
    • G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
    • G09G2300/0491—Use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or electrically controlled bi-refringence [ECB] for controlling the color
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the present invention relates to an on-vehicle display device mounted on a vehicle, and more particularly to a technique for controlling so that an optimal image can be displayed in a short time after power-on.
  • a liquid crystal display device is employed as such an in-vehicle display device.
  • a liquid crystal used in the liquid crystal display device a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, for example, OCB (Optically Compensated Birefringence) liquid crystal has been developed in recent years.
  • This OCB liquid crystal has a feature of quick response and a wide viewing angle, but at low temperatures, the time from turning on the power to starting the liquid crystal, specifically, the transition time from the splay state to the bend state is about several tens of seconds. There is a problem that video cannot be displayed during this period.
  • Patent Document 1 discloses that in a liquid crystal display device in which the initial alignment of liquid crystal molecules is different from the alignment for display, the transition of the liquid crystal alignment for display is completed in a short time.
  • a driving method of a liquid crystal display device that can be used is disclosed.
  • a voltage is applied to the liquid crystal layer until the transition to the alignment for display in the display region of the liquid crystal layer is completed. Further, after the transfer is completed, the backlight is turned on and the display drive mode is entered.
  • a voltage pulse having conditions (for example, frequency and voltage value) determined according to the temperature of the liquid crystal panel is applied to the liquid crystal layer.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an in-vehicle display device capable of displaying an image in a short time after the power is turned on.
  • an in-vehicle display device provides a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, a first power source that supplies power only to the liquid crystal, and power other than the liquid crystal.
  • Second power to be supplied, liquid crystal activation means for generating a liquid crystal activation signal instructing activation of only the liquid crystal, power activation means for generating a power activation signal instructing the entire activation, and delay time corresponding to temperature are stored.
  • the first timer that reads out from the setting table and starts counting the delay time that has been read out is supplied to the liquid crystal. Instructs the start of power supply to the second power source when the first timer finishes counting the delay time and a power-on signal is generated by the power-on means. And a power control unit.
  • the in-vehicle display device since power is supplied only to the liquid crystal before the entire power-on is instructed, an image can be displayed in a short time after the power is turned on.
  • FIG. 1 is a block diagram showing a configuration of an in-vehicle display device according to Embodiment 1 of the present invention.
  • the in-vehicle display device includes a door switch 1, an ignition key 2, a remote controller (hereinafter abbreviated as “remote controller”) 3, a temperature sensor 4, a control unit 5, a liquid crystal power supply 6, a power supply 7 other than liquid crystal, and a video control unit 8. And a liquid crystal 9.
  • the door switch 1 and the ignition key 2 cannot be said to be constituent elements of the in-vehicle display device, but here, for convenience, these will be described as constituent elements of the in-vehicle display device.
  • the door switch 1 corresponds to the liquid crystal activation means of the present invention.
  • the door switch 1 sends a signal indicating that to the control unit 5 as a liquid crystal activation signal.
  • the ignition key 2 corresponds to the liquid crystal activation means of the present invention. When the ignition key 2 is inserted into the key cylinder, a signal indicating that is sent to the control unit 5 as a liquid crystal activation signal.
  • the remote controller 3 corresponds to the power-on means of the present invention and is used to instruct power-on of the in-vehicle display device.
  • the remote controller 3 is used for various purposes other than the power-on instruction, but the description thereof is omitted because it is not directly related to the present invention.
  • an operation switch for instructing power-on can be used instead of the remote controller.
  • the temperature sensor 4 detects the ambient temperature.
  • the temperature detected by the temperature sensor 4 is sent to the control unit 5.
  • the control part 5 is comprised from the microcomputer, for example, and controls the whole this vehicle-mounted display apparatus. Details of the control unit 5 will be described later.
  • the liquid crystal power source 6 is a power source for starting the liquid crystal 9, and corresponds to the first power source of the present invention.
  • the liquid crystal power supply 6 supplies power only to the liquid crystal 9 in response to a liquid crystal activation signal sent from the control unit 5.
  • the power source 7 other than the liquid crystal is a power source for starting up a backlight or other control circuit (not shown), and corresponds to the second power source of the present invention.
  • the power supply 7 other than the liquid crystal supplies power other than the liquid crystal 9 in response to a power-on signal sent from the control unit 5.
  • the video control unit 8 is activated by a signal sent from the control unit 5, performs predetermined processing on the video signal sent from the outside, and sends it to the liquid crystal 9.
  • the liquid crystal 9 is composed of, for example, OCB liquid crystal. In an initial state where no power is supplied, the liquid crystal 9 is in a splay state in which liquid crystal molecules existing between the glass substrates are splayed as shown in FIG. Yes, video display is impossible. On the other hand, when the power is supplied, as shown in FIG. 2B, the liquid crystal molecules existing between the glass substrates are aligned in a bowed state (bend alignment) to bend and display an image. Become. The transition time from the splay state to the bend state changes depending on the ambient temperature.
  • the control unit 5 includes a clock 11, a signal detection unit 12, a video display start time setting table 13, a first timer 14, a second timer 15, and a power supply control unit 16.
  • the Clock 11 keeps time.
  • the clock 11 can be set by the user at an arbitrary time. Normally, the user sets the time 11 a few minutes before getting into the car.
  • the timepiece 11 sends a signal indicating that to the signal detection unit 12 as a liquid crystal activation signal.
  • the signal detection unit 12 detects the liquid crystal activation signal sent from the door switch 1, the ignition key 2 and the clock 11, and sends it to the video display start time setting table 13, the second timer 15 and the power supply control unit 16.
  • the signal detection unit 12 detects a power-on signal sent from the remote controller 3 and sends it to the power control unit 16.
  • the video display start time setting table 13 stores a delay time corresponding to the temperature as shown in FIG.
  • the delay time is the time from when power is supplied to the liquid crystal 9 until video display becomes possible, in other words, the transition time from the splay state to the bend state.
  • This video display start time setting table 13 outputs a delay time corresponding to the temperature sent from the temperature sensor 4 when a liquid crystal activation signal is sent from the signal detector 12, and the first time is set as the delay time value. Send to timer 14.
  • the first timer 14 sets the delay time value therein, and then starts counting down the delay time value.
  • the delay time value becomes zero, a signal indicating that is sent to the power supply control unit 16 and the video control unit 8.
  • the video controller 8 is activated by a signal indicating that the delay time value sent from the first timer 14 has become zero.
  • the second timer 15 sets a predetermined value therein and then starts counting down the predetermined value.
  • the predetermined value becomes zero, a signal indicating that is sent to the power supply control unit 16.
  • the power supply control unit 16 instructs the liquid crystal power supply 6 to start supplying power to the liquid crystal 9 when a liquid crystal activation signal is sent from the signal detection unit 12. Thereby, power supply from the liquid crystal power source 6 to the liquid crystal 9 is started, and the liquid crystal 9 is activated.
  • the power supply control unit 16 receives a signal indicating that the delay time value has become zero from the first timer 14, and when the power-on signal is transmitted from the signal detection unit 12, the liquid crystal The other power sources 7 are instructed to start power supply.
  • power supply from the power supply 7 other than the liquid crystal to, for example, a backlight or other control circuit (all of which are not shown) is started, and power is supplied to the entire in-vehicle display device.
  • the power supply control unit 16 sends a signal indicating that the predetermined value has become zero from the second timer 15 before the power-on signal is sent after the liquid crystal activation signal is sent from the signal detection unit 12.
  • the liquid crystal power supply 6 is instructed to stop the power supply to the liquid crystal 9. Thereby, the power supply from the liquid crystal power source 6 to the liquid crystal 9 is stopped.
  • the operation of the in-vehicle display device according to the first embodiment of the present invention configured as described above is a power-on process from when the power is not turned on until when the power is turned on to enable display.
  • a description will be given with reference to the flowchart shown in FIG.
  • step ST11 it is checked whether a liquid crystal activation signal is detected. That is, the signal detection unit 12 checks whether a liquid crystal activation signal sent from the door switch 1, the ignition key 2 or the timepiece 11 is detected. Thereby, it is checked whether the door of the vehicle has been opened, whether the ignition key has been inserted into the key cylinder, or whether a time preset by the user has arrived. If the liquid crystal activation signal is not detected in step ST11, the process waits until the liquid crystal activation signal is detected while repeatedly executing step ST11.
  • step ST12 the liquid crystal power supply is turned on (step ST12). That is, the signal detection unit 12 sends the detected liquid crystal activation signal to the power supply control unit 16, the video display start time setting table 13 and the second timer 15.
  • the power supply control unit 16 instructs the liquid crystal power supply 6 to start power supply to the liquid crystal 9. Thereby, power supply from the liquid crystal power source 6 to the liquid crystal 9 is started, and the liquid crystal 9 is activated.
  • the temperature is measured (step ST13). That is, the temperature sensor 4 detects the ambient temperature and sends it to the video display start time setting table 13.
  • the first timer 14 is initialized according to the measured temperature (step ST14). That is, the video display start time setting table 13 outputs a delay time corresponding to the temperature sent from the temperature sensor 4 in response to the liquid crystal activation signal sent from the signal detection unit 12, and as a delay time value. Send to first timer 14. Accordingly, the first timer 14 starts counting down the delay time value after setting the delay time value sent from the video display start time setting table 13 therein.
  • the second timer 15 is initialized (step ST15). That is, the second timer 15 sets a predetermined value in itself in response to the liquid crystal activation signal sent from the signal detection unit 12, and then starts counting down the predetermined value.
  • step ST16 it is checked whether or not the display power supply is instructed. That is, the signal detection unit 12 checks whether a power-on signal is sent from the remote controller 3 and sends the result to the power control unit 16.
  • step ST16 When it is determined in this step ST16 that an instruction to turn on the display power is given, the flag DISP is set to “1” (step ST17). That is, the power supply control unit 16 sets a flag DISP provided in a memory (not shown) existing therein to “1”. On the other hand, if it is determined in step ST16 that the display power supply is not instructed, the process in step ST17 is skipped.
  • step ST18 it is checked whether or not the time measurement of the first timer 14 has ended. That is, the power supply control unit 16 checks whether a signal indicating that the delay time value has become zero is sent from the first timer 14. If it is determined in step ST18 that the time measurement of the first timer 14 has not ended, the sequence returns to step ST16 and the above-described processing is repeated.
  • step ST18 if it is determined in step ST18 that the timing of the first timer 14 has ended, it is then checked whether or not the flag DISP is “1” (step ST19). That is, the power supply control unit 16 checks whether or not the flag DISP stored therein is “1”.
  • step ST19 If it is determined in this step ST19 that the flag DISP is “1”, a delay time corresponding to the ambient temperature has elapsed since the power was supplied to the liquid crystal 9, and the remote controller 3 has instructed the power ON.
  • the display process is executed (step ST20). That is, the power control unit 16 determines that a signal indicating that the delay time value has become zero is sent from the first timer 14 and a power-on signal is sent from the signal detection unit 12. Then, the power supply 7 other than the liquid crystal is instructed to start power supply. Thereby, power is turned on to the entire vehicle-mounted display device.
  • the video control unit 8 is activated by a signal indicating that the delay time value sent from the first timer 14 is zero, and displays a video corresponding to the video signal from the outside. This completes the power-on process.
  • step ST19 if it is determined that the flag DISP is not “1”, it is checked whether or not the timing of the second timer 15 has ended (step ST21). That is, the power supply control unit 16 checks whether a signal indicating that the predetermined value has become zero is sent from the second timer 15. If it is determined in step ST21 that the time measurement of the second timer 15 has not ended, the sequence returns to step ST16 and the above-described processing is repeated.
  • step ST21 when it is determined in step ST21 that the time measurement of the second timer 15 has ended, the liquid crystal power supply is turned off (step ST22). That is, the power supply control unit 16 sends a signal indicating that the predetermined value has become zero from the second timer 15 before the power-on signal is sent after the liquid crystal activation signal is sent from the signal detection unit 12.
  • the liquid crystal power supply 6 is instructed to stop the power supply to the liquid crystal 9. This realizes the function of stopping the power supply from the liquid crystal power supply 6 to the liquid crystal 9 when the remote control 3 does not instruct the entire power supply to be turned on even after a predetermined time has passed since the power supply of the liquid crystal 9 is turned on. Has been.
  • the vehicle-mounted display device when the vehicle door is opened, the power is turned on in advance of only the liquid crystal 9, so that the remote controller 3 is used. It is possible to shorten the time from when the entire power source of the in-vehicle display device is turned on until the optimum video can be viewed.
  • the power is turned on prior to the liquid crystal 9 alone. The time until it can be shortened.
  • the liquid crystal 9 can be turned on at a time set in advance by the user before turning on the entire power source of the in-vehicle display device, such as several minutes before getting into the car, the entire power source of the in-vehicle display device is The liquid crystal 9 has already been activated when turning on, so that the optimum video can be seen immediately.
  • the entire on-vehicle display device when the entire on-vehicle display device is not turned on even when the power is turned on only before the liquid crystal 9, the power supply to the liquid crystal 9 is stopped after a certain period of time. Therefore, it is possible to prevent the vehicle battery from being consumed more than necessary.
  • the present invention takes a predetermined time from turning on the power to starting the liquid crystal. It can also be applied to required ferroelectric liquid crystal or phase transition type liquid crystal.
  • the in-vehicle display device includes a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, the first power source that supplies power only to the liquid crystal, and the first power supply that supplies power to other than the liquid crystal.
  • 2 power supplies liquid crystal activation means for generating a liquid crystal activation signal instructing activation of only the liquid crystal, power activation means for generating a power activation signal instructing the entire activation, and video display storing a delay time corresponding to temperature From the video display start time setting table, a start time setting table, a temperature sensor for detecting the ambient temperature, and when a liquid crystal start signal is generated by the liquid crystal start means, a delay time corresponding to the temperature detected by the temperature sensor is displayed.
  • Read and start the supply of power to the liquid crystal with respect to the first power source when the liquid crystal start signal is generated by the first timer that starts counting of the read delay time and the liquid crystal start means A power control unit for instructing the second power source to start power supply to other than the liquid crystal when the first timer finishes counting the delay time and the power-on means generates a power-on signal Since the power is supplied only to the liquid crystal before the entire power-on is instructed, an image can be displayed in a short time after the power is turned on. Suitable for use in.

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  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

A vehicle-mounted display device mounted in a vehicle is provided. The vehicle-mounted display device comprises a liquid crystal (9) whose initial alignment of the liquid crystal molecules is different from the alignment for displaying, a first power supply (6) for supplying electric power only to the liquid crystal, a second power supply (7) for supplying electric power to other parts than the liquid crystal, liquid crystal start means (1, 2, 11) for generating a liquid crystal start signal for giving an instruction to start only the liquid crystal, power supply turn-on means (3) for generating a power supply turn-on signal for giving an instruction to start the whole device, a table (13) storing delay times corresponding to temperatures, a temperature sensor (4) for sensing the ambient temperature, a first timer (14) which reads the delay time corresponding to the sensed temperature from the table in response to the generation of the liquid crystal start signal and starts counting, and a power supply control section (16) for instructing the first power supply to start power supply to the liquid crystal in response to the generation of the liquid crystal start signal and instructing the second power supply to start power supply to the other parts than the liquid crystal in response to the generation of the power supply turn-on signal when the first timer finishes the counting of the delay time. According to the invention, electric power is supplied only to the liquid crystal before the instruction to turn on the power supply to the whole, and thereby a video is displayed in a short time after the power supply is turned on.

Description

車載ディスプレイ装置In-vehicle display device
　この発明は、車両に搭載される車載ディスプレイ装置に関し、特に、電源投入から短時間で最適な映像を表示できるように制御する技術に関する。 The present invention relates to an on-vehicle display device mounted on a vehicle, and more particularly to a technique for controlling so that an optimal image can be displayed in a short time after power-on.
　近年、ナビゲーションまたはエンターテイメントなどの目的のために、自動車に車載ディスプレイ装置を設置するケースが増加してきている。このような車載ディスプレイ装置として、多くの場合、液晶ディスプレイ装置が採用されている。この液晶ディスプレイ装置で使用される液晶として、近年、液晶分子の初期配向が表示のための配向と異なる液晶、例えばＯＣＢ（Ｏｐｔｉｃａｌｌｙ Ｃｏｍｐｅｎｓａｔｅｄ Ｂｉｒｅｆｒｉｎｇｅｎｃｅ）液晶が開発されている。このＯＣＢ液晶は、応答が速く視野角が広いという特徴を有するが、低温時には、電源投入から液晶が起動するまでの時間、具体的にはスプレイ状態からベンド状態への転移時間が数十秒程度必要であり、その間は映像を表示できないという問題がある。 In recent years, the number of cases where an in-vehicle display device is installed in an automobile for the purpose of navigation or entertainment is increasing. In many cases, a liquid crystal display device is employed as such an in-vehicle display device. As a liquid crystal used in the liquid crystal display device, a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, for example, OCB (Optically Compensated Birefringence) liquid crystal has been developed in recent years. This OCB liquid crystal has a feature of quick response and a wide viewing angle, but at low temperatures, the time from turning on the power to starting the liquid crystal, specifically, the transition time from the splay state to the bend state is about several tens of seconds. There is a problem that video cannot be displayed during this period.
　このような問題を解消する技術として、特許文献１は、液晶分子の初期配向が表示のための配向と異なる液晶表示装置において、その表示のための液晶配向の転移を確実かつ短時間で終了させることができる液晶表示装置の駆動方法を開示している。この液晶表示装置の駆動方法では、液晶層の表示領域の表示のための配向への転移が終了するまで液晶層に電圧を印加する。また、転移が完了した後、バックライトを点灯し、表示駆動モードに移行する。短時間で転移を完了させるためには、液晶パネルの温度に応じて決定した条件（例えば、周波数、電圧値）の電圧パルスを液晶層に印加する。 As a technique for solving such a problem, Patent Document 1 discloses that in a liquid crystal display device in which the initial alignment of liquid crystal molecules is different from the alignment for display, the transition of the liquid crystal alignment for display is completed in a short time. A driving method of a liquid crystal display device that can be used is disclosed. In this driving method of the liquid crystal display device, a voltage is applied to the liquid crystal layer until the transition to the alignment for display in the display region of the liquid crystal layer is completed. Further, after the transfer is completed, the backlight is turned on and the display drive mode is entered. In order to complete the transition in a short time, a voltage pulse having conditions (for example, frequency and voltage value) determined according to the temperature of the liquid crystal panel is applied to the liquid crystal layer.
特開２００２－００６２８４号公報JP 2002-006284 A
　上述した特許文献１に開示された技術では、液晶配向の転移時間自体を短縮することはできるが、車載ディスプレイ装置の電源投入直後に液晶配向の転移が完了しているとは限らない。したがって、低温時に、電源投入から液晶が起動するまでの間は映像を表示できないという問題は残されたままである。 In the technique disclosed in Patent Document 1 described above, the transition time of the liquid crystal alignment itself can be shortened, but the transition of the liquid crystal alignment is not always completed immediately after the vehicle-mounted display device is turned on. Therefore, the problem that an image cannot be displayed at a low temperature from when the power is turned on until the liquid crystal is activated remains.
　この発明は、上述した問題を解消するためになされたものであり、その課題は、電源投入から短時間で映像を表示できる車載ディスプレイ装置を提供することにある。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an in-vehicle display device capable of displaying an image in a short time after the power is turned on.
　この発明に係る車載ディスプレイ装置は、上記課題を解決するために、液晶分子の初期配向が表示のための配向と異なる液晶と、液晶のみに電力を供給する第１電源と、液晶以外に電力を供給する第２電源と、液晶のみの起動を指示する液晶起動信号を発生する液晶起動手段と、全体の起動を指示する電源投入信号を発生する電源投入手段と、温度に対応した遅延時間を記憶した映像表示開始時間設定テーブルと、周囲の温度を検出する温度センサと、液晶起動手段で液晶起動信号が発生された場合に、温度センサで検出された温度に対応する遅延時間を映像表示開始時間設定テーブルから読み出し、該読み出した遅延時間のカウントを開始する第１タイマと、液晶起動手段で液晶起動信号が発生された場合に、第１電源に対して液晶への電力供給開始を指示し、第１タイマで遅延時間のカウントが終了し、かつ、電源投入手段で電源投入信号が発生された場合に、第２電源に対して液晶以外への電力供給開始を指示する電源制御部とを備えている。 In order to solve the above problems, an in-vehicle display device according to the present invention provides a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, a first power source that supplies power only to the liquid crystal, and power other than the liquid crystal. Second power to be supplied, liquid crystal activation means for generating a liquid crystal activation signal instructing activation of only the liquid crystal, power activation means for generating a power activation signal instructing the entire activation, and delay time corresponding to temperature are stored The video display start time setting table, the temperature sensor for detecting the ambient temperature, and when the liquid crystal start signal is generated by the liquid crystal start means, the delay time corresponding to the temperature detected by the temperature sensor is displayed. When the liquid crystal activation signal is generated by the liquid crystal activation means, the first timer that reads out from the setting table and starts counting the delay time that has been read out is supplied to the liquid crystal. Instructs the start of power supply to the second power source when the first timer finishes counting the delay time and a power-on signal is generated by the power-on means. And a power control unit.
　この発明に係る車載ディスプレイ装置によれば、全体の電源投入が指示される前に、液晶のみに電力が供給されるので、電源投入から短時間で映像を表示できる。 According to the in-vehicle display device according to the present invention, since power is supplied only to the liquid crystal before the entire power-on is instructed, an image can be displayed in a short time after the power is turned on.
この発明の実施の形態１に係る車載ディスプレイ装置の構成を示すブロック図である。It is a block diagram which shows the structure of the vehicle-mounted display apparatus which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る車載ディスプレイ装置で使用される液晶を説明するための図である。It is a figure for demonstrating the liquid crystal used with the vehicle-mounted display apparatus which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る車載ディスプレイ装置で使用される液晶の温度と使用可能になるまでの遅延時間との関係を説明するための説明図である。It is explanatory drawing for demonstrating the relationship between the temperature of the liquid crystal used with the vehicle-mounted display apparatus which concerns on Embodiment 1 of this invention, and the delay time until it becomes usable. この発明の実施の形態１に係る車載ディスプレイ装置の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of the vehicle-mounted display apparatus which concerns on Embodiment 1 of this invention.
　以下、この発明をより詳細に説明するために、この発明を実施するための最良の形態について、添付の図面に従って説明する。
実施の形態１．
　図１は、この発明の実施の形態１に係る車載ディスプレイ装置の構成を示すブロック図である。この車載ディスプレイ装置は、ドアスイッチ１、イグニッションキー２、リモートコントローラ（以下、「リモコン」と略する）３、温度センサ４、制御部５、液晶電源６、液晶以外の電源７、映像制御部８および液晶９を備えている。なお、厳密な意味では、ドアスイッチ１およびイグニッションキー２は車載ディスプレイ装置の構成要素とは言えないが、ここでは、便宜上、これらも車載ディスプレイ装置の構成要素として説明する。 Hereinafter, in order to describe the present invention in more detail, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of an in-vehicle display device according to Embodiment 1 of the present invention. The in-vehicle display device includes a door switch 1, an ignition key 2, a remote controller (hereinafter abbreviated as “remote controller”) 3, a temperature sensor 4, a control unit 5, a liquid crystal power supply 6, a power supply 7 other than liquid crystal, and a video control unit 8. And a liquid crystal 9. In a strict sense, the door switch 1 and the ignition key 2 cannot be said to be constituent elements of the in-vehicle display device, but here, for convenience, these will be described as constituent elements of the in-vehicle display device.
　ドアスイッチ１は、この発明の液晶起動手段に対応し、車両のドアが開かれた場合に、その旨を表す信号を液晶起動信号として制御部５に送る。イグニッションキー２は、この発明の液晶起動手段に対応し、キーシリンダに差し込まれた場合に、その旨を表す信号を液晶起動信号として制御部５に送る。 The door switch 1 corresponds to the liquid crystal activation means of the present invention. When the door of the vehicle is opened, the door switch 1 sends a signal indicating that to the control unit 5 as a liquid crystal activation signal. The ignition key 2 corresponds to the liquid crystal activation means of the present invention. When the ignition key 2 is inserted into the key cylinder, a signal indicating that is sent to the control unit 5 as a liquid crystal activation signal.
　リモコン３は、この発明の電源投入手段に対応し、当該車載ディスプレイ装置の電源投入を指示するために使用される。なお、このリモコン３は、電源投入の指示以外にも、種々の用途に用いられるが、この発明とは直接関係しないので説明を省略する。また、この発明の電源投入手段としては、リモコンの代わりに電源投入を指示するための操作スイッチを用いることもできる。 The remote controller 3 corresponds to the power-on means of the present invention and is used to instruct power-on of the in-vehicle display device. The remote controller 3 is used for various purposes other than the power-on instruction, but the description thereof is omitted because it is not directly related to the present invention. As the power-on means of the present invention, an operation switch for instructing power-on can be used instead of the remote controller.
　温度センサ４は、周囲の温度を検出する。この温度センサ４で検出された温度は、制御部５に送られる。制御部５は、例えばマイクロコンピュータから構成されており、この車載ディスプレイ装置の全体を制御する。この制御部５の詳細は後述する。 The temperature sensor 4 detects the ambient temperature. The temperature detected by the temperature sensor 4 is sent to the control unit 5. The control part 5 is comprised from the microcomputer, for example, and controls the whole this vehicle-mounted display apparatus. Details of the control unit 5 will be described later.
　液晶電源６は、液晶９を起動するための電源であり、この発明の第１電源に対応する。この液晶電源６は、制御部５から送られてくる液晶起動信号に応じて、液晶９のみに電力を供給する。液晶以外の電源７は、バックライトまたはその他の制御回路など（いずれも図示を省略する）を起動するための電源であり、この発明の第２電源に対応する。この液晶以外の電源７は、制御部５から送られてくる電源投入信号に応じて、液晶９以外に電力を供給する。 The liquid crystal power source 6 is a power source for starting the liquid crystal 9, and corresponds to the first power source of the present invention. The liquid crystal power supply 6 supplies power only to the liquid crystal 9 in response to a liquid crystal activation signal sent from the control unit 5. The power source 7 other than the liquid crystal is a power source for starting up a backlight or other control circuit (not shown), and corresponds to the second power source of the present invention. The power supply 7 other than the liquid crystal supplies power other than the liquid crystal 9 in response to a power-on signal sent from the control unit 5.
　映像制御部８は、制御部５から送られてくる信号によって起動され、外部から送られてくる映像信号に所定の処理を施して液晶９に送る。液晶９は、例えばＯＣＢ液晶から構成されており、電源が供給されていない初期状態では、図２（ａ）に示すように、ガラス基板の間に存在する液晶分子がスプレイ配列されたスプレイ状態にあり、映像表示は不可能である。一方、電源が供給されると、図２（ｂ）に示すように、ガラス基板の間に存在する液晶分子が、弓なり状態に配向（ベンド配向）してベンド状態になり、映像表示が可能になる。スプレイ状態からベンド状態への転移時間は、周囲温度に依存して変換する。 The video control unit 8 is activated by a signal sent from the control unit 5, performs predetermined processing on the video signal sent from the outside, and sends it to the liquid crystal 9. The liquid crystal 9 is composed of, for example, OCB liquid crystal. In an initial state where no power is supplied, the liquid crystal 9 is in a splay state in which liquid crystal molecules existing between the glass substrates are splayed as shown in FIG. Yes, video display is impossible. On the other hand, when the power is supplied, as shown in FIG. 2B, the liquid crystal molecules existing between the glass substrates are aligned in a bowed state (bend alignment) to bend and display an image. Become. The transition time from the splay state to the bend state changes depending on the ambient temperature.
　次に、制御部５の詳細を説明する。制御部５は、時計１１、信号検知部１２、映像表示開始時間設定テーブル１３、第１タイマ１４、第２タイマ１５および電源制御部１６を備えている。 Next, details of the control unit 5 will be described. The control unit 5 includes a clock 11, a signal detection unit 12, a video display start time setting table 13, a first timer 14, a second timer 15, and a power supply control unit 16.
　時計１１は、時刻を計時する。この時計１１には、ユーザは任意の時刻を設定することができる。通常は、ユーザは、車に乗る数分前の時刻を時計１１に設定する。この時計１１は、設定された時刻が到来した時は、その旨を表す信号を、液晶起動信号として信号検知部１２に送る。 Clock 11 keeps time. The clock 11 can be set by the user at an arbitrary time. Normally, the user sets the time 11 a few minutes before getting into the car. When the set time arrives, the timepiece 11 sends a signal indicating that to the signal detection unit 12 as a liquid crystal activation signal.
　信号検知部１２は、ドアスイッチ１、イグニッションキー２および時計１１から送られてくる液晶起動信号を検知し、映像表示開始時間設定テーブル１３、第２タイマ１５および電源制御部１６に送る。また、信号検知部１２は、リモコン３から送られてくる電源投入信号を検知し、電源制御部１６に送る。 The signal detection unit 12 detects the liquid crystal activation signal sent from the door switch 1, the ignition key 2 and the clock 11, and sends it to the video display start time setting table 13, the second timer 15 and the power supply control unit 16. The signal detection unit 12 detects a power-on signal sent from the remote controller 3 and sends it to the power control unit 16.
　映像表示開始時間設定テーブル１３は、図３に示すような、温度に対応した遅延時間を記憶している。遅延時間は、液晶９に電源を供給してから映像表示が可能になるまでの時間、換言すれば、スプレイ状態からベンド状態への転移時間である。この映像表示開始時間設定テーブル１３は、信号検知部１２から液晶起動信号が送られてきた場合に、温度センサ４から送られてくる温度に対応する遅延時間を出力し、遅延時間値として第１タイマ１４に送る。 The video display start time setting table 13 stores a delay time corresponding to the temperature as shown in FIG. The delay time is the time from when power is supplied to the liquid crystal 9 until video display becomes possible, in other words, the transition time from the splay state to the bend state. This video display start time setting table 13 outputs a delay time corresponding to the temperature sent from the temperature sensor 4 when a liquid crystal activation signal is sent from the signal detector 12, and the first time is set as the delay time value. Send to timer 14.
　第１タイマ１４は、映像表示開始時間設定テーブル１３から遅延時間値が送られてきた場合に、その遅延時間値を自己の内部にセットした後に、遅延時間値のカウントダウンを開始する。そして、遅延時間値がゼロになった場合に、その旨を表す信号を電源制御部１６および映像制御部８に送る。映像制御部８は、第１タイマ１４から送られてくる遅延時間値がゼロになった旨の信号によって起動される。 When the delay time value is sent from the video display start time setting table 13, the first timer 14 sets the delay time value therein, and then starts counting down the delay time value. When the delay time value becomes zero, a signal indicating that is sent to the power supply control unit 16 and the video control unit 8. The video controller 8 is activated by a signal indicating that the delay time value sent from the first timer 14 has become zero.
　第２タイマ１５は、信号検知部１２から液晶起動信号が送られてきた場合に、所定値を自己の内部にセットした後に、その所定値のカウントダウンを開始する。そして、所定値がゼロになった場合に、その旨を表す信号を電源制御部１６に送る。 When the liquid crystal activation signal is sent from the signal detection unit 12, the second timer 15 sets a predetermined value therein and then starts counting down the predetermined value. When the predetermined value becomes zero, a signal indicating that is sent to the power supply control unit 16.
　電源制御部１６は、信号検知部１２から液晶起動信号が送られてきた場合に、液晶電源６に対して、液晶９への電力供給を開始するように指示する。これにより、液晶電源６から液晶９への電源供給が開始され、液晶９が起動される。また、電源制御部１６は、第１タイマ１４から遅延時間値がゼロになった旨の信号が送られてきており、かつ、信号検知部１２から電源投入信号が送られてきた場合に、液晶以外の電源７に対して、電力供給を開始するように指示する。これにより、液晶以外の電源７から、例えばバックライトまたはその他の制御回路など（いずれも図示を省略する）への電源供給が開始され、該車載ディスプレイ装置の全体へ電源が投入される。 The power supply control unit 16 instructs the liquid crystal power supply 6 to start supplying power to the liquid crystal 9 when a liquid crystal activation signal is sent from the signal detection unit 12. Thereby, power supply from the liquid crystal power source 6 to the liquid crystal 9 is started, and the liquid crystal 9 is activated. In addition, the power supply control unit 16 receives a signal indicating that the delay time value has become zero from the first timer 14, and when the power-on signal is transmitted from the signal detection unit 12, the liquid crystal The other power sources 7 are instructed to start power supply. As a result, power supply from the power supply 7 other than the liquid crystal to, for example, a backlight or other control circuit (all of which are not shown) is started, and power is supplied to the entire in-vehicle display device.
　さらに、電源制御部１６は、信号検知部１２から液晶起動信号が送られてきてから電源投入信号が送られてくる前に、第２タイマ１５から所定値がゼロになった旨の信号が送られてきた場合に、液晶電源６に対して、液晶９への電力供給を停止するように指示する。これにより、液晶電源６から液晶９への電源供給が停止される。 Further, the power supply control unit 16 sends a signal indicating that the predetermined value has become zero from the second timer 15 before the power-on signal is sent after the liquid crystal activation signal is sent from the signal detection unit 12. When it has been received, the liquid crystal power supply 6 is instructed to stop the power supply to the liquid crystal 9. Thereby, the power supply from the liquid crystal power source 6 to the liquid crystal 9 is stopped.
　次に、上記のように構成される、この発明の実施の形態１に係る車載ディスプレイ装置の動作を、電源が未投入の状態から電源が投入されて表示可能な状態になるまでの電源投入処理を中心に、図４に示すフローチャートを参照しながら説明する。 Next, the operation of the in-vehicle display device according to the first embodiment of the present invention configured as described above is a power-on process from when the power is not turned on until when the power is turned on to enable display. A description will be given with reference to the flowchart shown in FIG.
　まず、液晶起動信号が検知されたかどうかが調べられる（ステップＳＴ１１）。すなわち、信号検知部１２は、ドアスイッチ１、イグニッションキー２または時計１１から送られてきた液晶起動信号を検知したかどうかを調べる。これにより、車両のドアが開けられたか、イグニッションキーがキーシリンダに差し込まれたか、または、ユーザが予め設定した時刻が到来したかどうかが調べられる。
このステップＳＴ１１において、液晶起動信号が検知されていない場合は、このステップＳＴ１１を繰り返し実行しながら液晶起動信号が検知されるまで待機する。 First, it is checked whether a liquid crystal activation signal is detected (step ST11). That is, the signal detection unit 12 checks whether a liquid crystal activation signal sent from the door switch 1, the ignition key 2 or the timepiece 11 is detected. Thereby, it is checked whether the door of the vehicle has been opened, whether the ignition key has been inserted into the key cylinder, or whether a time preset by the user has arrived.
If the liquid crystal activation signal is not detected in step ST11, the process waits until the liquid crystal activation signal is detected while repeatedly executing step ST11.
　上記ステップＳＴ１１において、液晶起動信号が検知されたことが判断されると、次いで、液晶電源がＯＮされる（ステップＳＴ１２）。すなわち、信号検知部１２は、検知した液晶起動信号を電源制御部１６、映像表示開始時間設定テーブル１３および第２タイマ１５に送る。電源制御部１６は、信号検知部１２から送られてきた液晶起動信号に応答して、液晶電源６に対して、液晶９への電力供給を開始するように指示する。これにより、液晶電源６から液晶９への電源供給が開始され、液晶９が起動される。 If it is determined in step ST11 that the liquid crystal activation signal has been detected, then the liquid crystal power supply is turned on (step ST12). That is, the signal detection unit 12 sends the detected liquid crystal activation signal to the power supply control unit 16, the video display start time setting table 13 and the second timer 15. In response to the liquid crystal activation signal sent from the signal detection unit 12, the power supply control unit 16 instructs the liquid crystal power supply 6 to start power supply to the liquid crystal 9. Thereby, power supply from the liquid crystal power source 6 to the liquid crystal 9 is started, and the liquid crystal 9 is activated.
　次いで、温度が計測される（ステップＳＴ１３）。すなわち、温度センサ４は、周囲の温度を検出し、映像表示開始時間設定テーブル１３に送る。次いで、計測された温度に応じて第１タイマ１４が初期化される（ステップＳＴ１４）。すなわち、映像表示開始時間設定テーブル１３は、信号検知部１２から送られてきた液晶起動信号に応答して、温度センサ４から送られてくる温度に対応する遅延時間を出力し、遅延時間値として第１タイマ１４に送る。これにより、第１タイマ１４は、映像表示開始時間設定テーブル１３から送られてきた遅延時間値を自己の内部にセットした後に、遅延時間値のカウントダウンを開始する。 Next, the temperature is measured (step ST13). That is, the temperature sensor 4 detects the ambient temperature and sends it to the video display start time setting table 13. Next, the first timer 14 is initialized according to the measured temperature (step ST14). That is, the video display start time setting table 13 outputs a delay time corresponding to the temperature sent from the temperature sensor 4 in response to the liquid crystal activation signal sent from the signal detection unit 12, and as a delay time value. Send to first timer 14. Accordingly, the first timer 14 starts counting down the delay time value after setting the delay time value sent from the video display start time setting table 13 therein.
　次いで、第２タイマ１５が初期化される（ステップＳＴ１５）。すなわち、第２タイマ１５は、信号検知部１２から送られてきた液晶起動信号に応答して、所定値を自己の内部にセットした後に、その所定値のカウントダウンを開始する。 Next, the second timer 15 is initialized (step ST15). That is, the second timer 15 sets a predetermined value in itself in response to the liquid crystal activation signal sent from the signal detection unit 12, and then starts counting down the predetermined value.
　次いで、ディスプレイ電源のＯＮが指示されたかどうかが調べられる（ステップＳＴ１６）。すなわち、信号検知部１２は、リモコン３から電源投入信号が送られてきたかどうかを調べ、その結果を電源制御部１６に送る。 Next, it is checked whether or not the display power supply is instructed (step ST16). That is, the signal detection unit 12 checks whether a power-on signal is sent from the remote controller 3 and sends the result to the power control unit 16.
　このステップＳＴ１６において、ディスプレイ電源のＯＮが指示されたことが判断されると、フラグＤＩＳＰが「１」にセットされる（ステップＳＴ１７）。すなわち、電源制御部１６は、自己の内部に存在するメモリ（図示しない）に設けられたフラグＤＩＳＰを「１」に設定する。一方、ステップＳＴ１６において、ディスプレイ電源のＯＮが指示されていないことが判断されると、ステップＳＴ１７の処理はスキップされる。 When it is determined in this step ST16 that an instruction to turn on the display power is given, the flag DISP is set to “1” (step ST17). That is, the power supply control unit 16 sets a flag DISP provided in a memory (not shown) existing therein to “1”. On the other hand, if it is determined in step ST16 that the display power supply is not instructed, the process in step ST17 is skipped.
　次いで、第１タイマ１４の計時が終了したかどうかが調べられる（ステップＳＴ１８）。すなわち、電源制御部１６は、第１タイマ１４から、遅延時間値がゼロになった旨を表す信号が送られてきたかどうかを調べる。このステップＳＴ１８において、第１タイマ１４の計時が終了していないことが判断されると、シーケンスはステップＳＴ１６に戻り、上述した処理が繰り返される。 Next, it is checked whether or not the time measurement of the first timer 14 has ended (step ST18). That is, the power supply control unit 16 checks whether a signal indicating that the delay time value has become zero is sent from the first timer 14. If it is determined in step ST18 that the time measurement of the first timer 14 has not ended, the sequence returns to step ST16 and the above-described processing is repeated.
　一方、ステップＳＴ１８において、第１タイマ１４の計時が終了したことが判断されると、次いで、フラグＤＩＳＰが「１」であるかどうかが調べられる（ステップＳＴ１９）。すなわち、電源制御部１６は、自己の内部に保存しているフラグＤＩＳＰが「１」であるかどうかを調べる。 On the other hand, if it is determined in step ST18 that the timing of the first timer 14 has ended, it is then checked whether or not the flag DISP is “1” (step ST19). That is, the power supply control unit 16 checks whether or not the flag DISP stored therein is “1”.
　このステップＳＴ１９において、フラグＤＩＳＰが「１」であることが判断されると、液晶９に電源が供給されてから、周囲温度に応じた遅延時間が経過し、かつ、リモコン３により電源ＯＮの指示がなされたことが認識され、表示処理が実行される（ステップＳＴ２０）。すなわち、電源制御部１６は、第１タイマ１４から遅延時間値がゼロになった旨の信号が送られてきており、かつ、信号検知部１２から電源投入信号が送られてきていることを判断し、液晶以外の電源７に対して、電力供給を開始するように指示する。これにより、車載ディスプレイ装置の全体へ電源が投入される。また、映像制御部８は、第１タイマ１４から送られてくる遅延時間値がゼロになった旨の信号によって起動され、外部からの映像信号に応じた映像を表示する。以上により電源投入処理は終了する。 If it is determined in this step ST19 that the flag DISP is “1”, a delay time corresponding to the ambient temperature has elapsed since the power was supplied to the liquid crystal 9, and the remote controller 3 has instructed the power ON. The display process is executed (step ST20). That is, the power control unit 16 determines that a signal indicating that the delay time value has become zero is sent from the first timer 14 and a power-on signal is sent from the signal detection unit 12. Then, the power supply 7 other than the liquid crystal is instructed to start power supply. Thereby, power is turned on to the entire vehicle-mounted display device. The video control unit 8 is activated by a signal indicating that the delay time value sent from the first timer 14 is zero, and displays a video corresponding to the video signal from the outside. This completes the power-on process.
　上記ステップＳＴ１９において、フラグＤＩＳＰが「１」でないことが判断されると、第２タイマ１５の計時が終了したかどうかが調べられる（ステップＳＴ２１）。すなわち、電源制御部１６は、第２タイマ１５から、所定値がゼロになった旨を表す信号が送られてきたかどうかを調べる。このステップＳＴ２１において、第２タイマ１５の計時が終了していないことが判断されると、シーケンスはステップＳＴ１６に戻り、上述した処理が繰り返される。 In step ST19, if it is determined that the flag DISP is not “1”, it is checked whether or not the timing of the second timer 15 has ended (step ST21). That is, the power supply control unit 16 checks whether a signal indicating that the predetermined value has become zero is sent from the second timer 15. If it is determined in step ST21 that the time measurement of the second timer 15 has not ended, the sequence returns to step ST16 and the above-described processing is repeated.
　一方、ステップＳＴ２１において、第２タイマ１５の計時が終了したことが判断されると、液晶電源がＯＦＦにされる（ステップＳＴ２２）。すなわち、電源制御部１６は、信号検知部１２から液晶起動信号が送られてきてから電源投入信号が送られてくる前に、第２タイマ１５から所定値がゼロになった旨の信号が送られてきた場合に、液晶電源６に対して、液晶９への電力供給を停止するように指示する。これにより、液晶９の電源が投入されてから一定時間が経過してもリモコン３により全体の電源投入の指示がなされない場合に、液晶電源６から液晶９への電源供給を停止する機能が実現されている。 On the other hand, when it is determined in step ST21 that the time measurement of the second timer 15 has ended, the liquid crystal power supply is turned off (step ST22). That is, the power supply control unit 16 sends a signal indicating that the predetermined value has become zero from the second timer 15 before the power-on signal is sent after the liquid crystal activation signal is sent from the signal detection unit 12. When it has been received, the liquid crystal power supply 6 is instructed to stop the power supply to the liquid crystal 9. This realizes the function of stopping the power supply from the liquid crystal power supply 6 to the liquid crystal 9 when the remote control 3 does not instruct the entire power supply to be turned on even after a predetermined time has passed since the power supply of the liquid crystal 9 is turned on. Has been.
　以上説明したように、この発明の実施の形態１に係る車載ディスプレイ装置によれば、車両のドアを開けた際に、液晶９のみに先行して電源が投入されるので、リモコン３を用いて車載ディスプレイ装置の全体の電源を投入してから最適な映像を見られるまでの時間を短縮することができる。 As described above, according to the vehicle-mounted display device according to the first embodiment of the present invention, when the vehicle door is opened, the power is turned on in advance of only the liquid crystal 9, so that the remote controller 3 is used. It is possible to shorten the time from when the entire power source of the in-vehicle display device is turned on until the optimum video can be viewed.
　また、イグニッションキー２をキーシリンダに挿入した際に、液晶９のみに先行して電源が投入されるので、リモコン３を用いて車載ディスプレイ装置の全体の電源を投入してから最適な映像を見られるまでの時間を短縮することができる。 In addition, when the ignition key 2 is inserted into the key cylinder, the power is turned on prior to the liquid crystal 9 alone. The time until it can be shortened.
　また、車に乗る数分前などといった、車載ディスプレイ装置の全体の電源を投入する前の、ユーザが予め設定した時刻に液晶９の電源を投入することができるので、車載ディスプレイ装置の全体の電源を投入するときには既に液晶９が起動されており、即座に最適な映像を見ることができる。 Further, since the liquid crystal 9 can be turned on at a time set in advance by the user before turning on the entire power source of the in-vehicle display device, such as several minutes before getting into the car, the entire power source of the in-vehicle display device is The liquid crystal 9 has already been activated when turning on, so that the optimum video can be seen immediately.
　さらに、上述したように、液晶９のみに先行して電源を投入したにも拘わらず、車載ディスプレイ装置の全体の電源が投入されない場合に、一定時間が経過すると液晶９への電源供給が停止されるので、車両のバッテリーが必要以上に消耗されるのを防ぐことができる。 Further, as described above, when the entire on-vehicle display device is not turned on even when the power is turned on only before the liquid crystal 9, the power supply to the liquid crystal 9 is stopped after a certain period of time. Therefore, it is possible to prevent the vehicle battery from being consumed more than necessary.
　なお、上述した実施の形態１に係る車載ディスプレイ装置では、液晶９としてＯＣＢ液晶を使用する場合を例に挙げて説明したが、この発明は、電源投入から液晶が起動するまでに所定の時間を要する強誘電性液晶または相転移型液晶などにも適用することができる。 In the on-vehicle display device according to the first embodiment described above, the case where the OCB liquid crystal is used as the liquid crystal 9 has been described as an example. However, the present invention takes a predetermined time from turning on the power to starting the liquid crystal. It can also be applied to required ferroelectric liquid crystal or phase transition type liquid crystal.
　以上のように、この発明に係る車載ディスプレイ装置は、液晶分子の初期配向が表示のための配向と異なる液晶と、液晶のみに電力を供給する第１電源と、液晶以外に電力を供給する第２電源と、液晶のみの起動を指示する液晶起動信号を発生する液晶起動手段と、全体の起動を指示する電源投入信号を発生する電源投入手段と、温度に対応した遅延時間を記憶した映像表示開始時間設定テーブルと、周囲の温度を検出する温度センサと、液晶起動手段で液晶起動信号が発生された場合に、温度センサで検出された温度に対応する遅延時間を映像表示開始時間設定テーブルから読み出し、該読み出した遅延時間のカウントを開始する第１タイマと、液晶起動手段で液晶起動信号が発生された場合に、第１電源に対して液晶への電力供給開始を指示し、第１タイマで遅延時間のカウントが終了し、かつ、電源投入手段で電源投入信号が発生された場合に、第２電源に対して液晶以外への電力供給開始を指示する電源制御部とを備えるように構成したので、全体の電源投入が指示される前に、液晶のみに電力が供給されるので、電源投入から短時間で映像を表示でき、車両に搭載される車載ディスプレイ装置などに用いるのに適している。 As described above, the in-vehicle display device according to the present invention includes a liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display, the first power source that supplies power only to the liquid crystal, and the first power supply that supplies power to other than the liquid crystal. 2 power supplies, liquid crystal activation means for generating a liquid crystal activation signal instructing activation of only the liquid crystal, power activation means for generating a power activation signal instructing the entire activation, and video display storing a delay time corresponding to temperature From the video display start time setting table, a start time setting table, a temperature sensor for detecting the ambient temperature, and when a liquid crystal start signal is generated by the liquid crystal start means, a delay time corresponding to the temperature detected by the temperature sensor is displayed. Read and start the supply of power to the liquid crystal with respect to the first power source when the liquid crystal start signal is generated by the first timer that starts counting of the read delay time and the liquid crystal start means A power control unit for instructing the second power source to start power supply to other than the liquid crystal when the first timer finishes counting the delay time and the power-on means generates a power-on signal Since the power is supplied only to the liquid crystal before the entire power-on is instructed, an image can be displayed in a short time after the power is turned on. Suitable for use in.

Claims (5)

  1. 　液晶分子の初期配向が表示のための配向と異なる液晶と、
    　前記液晶のみに電力を供給する第１電源と、
    　前記液晶以外に電力を供給する第２電源と、
    　前記液晶のみの起動を指示する液晶起動信号を発生する液晶起動手段と、
    　全体の電源投入を指示する電源投入信号を発生する電源投入手段と、
    　温度に対応した遅延時間を記憶した映像表示開始時間設定テーブルと、
    　周囲の温度を検出する温度センサと、
    　前記液晶起動手段で液晶起動信号が発生された場合に、前記温度センサで検出された温度に対応する遅延時間を前記映像表示開始時間設定テーブルから読み出し、該読み出した遅延時間のカウントを開始する第１タイマと、
    　前記液晶起動手段で液晶起動信号が発生された場合に、前記第１電源に対して前記液晶への電力供給開始を指示し、前記第１タイマで遅延時間のカウントが終了し、かつ、前記電源投入手段で電源投入信号が発生された場合に、前記第２電源に対して前記液晶以外への電力供給開始を指示する電源制御部
    とを備えた車載ディスプレイ装置。     A liquid crystal in which the initial alignment of liquid crystal molecules is different from the alignment for display;
    A first power source for supplying power only to the liquid crystal;
    A second power source for supplying power other than the liquid crystal;
    Liquid crystal activation means for generating a liquid crystal activation signal instructing activation of only the liquid crystal;
    A power-on means for generating a power-on signal instructing the entire power-on;
    A video display start time setting table storing a delay time corresponding to the temperature;
    A temperature sensor that detects the ambient temperature;
    When a liquid crystal activation signal is generated by the liquid crystal activation means, a delay time corresponding to the temperature detected by the temperature sensor is read from the video display start time setting table and counting of the read delay time is started. 1 timer,
    When a liquid crystal activation signal is generated by the liquid crystal activation means, the first power supply is instructed to start power supply to the liquid crystal, the delay of the delay time is terminated by the first timer, and the power supply A vehicle-mounted display device comprising: a power control unit that instructs the second power supply to start power supply to other than the liquid crystal when a power-on signal is generated by the power-on means.
  2. 　液晶起動手段で発生される液晶起動信号は、車両のドアが開かれたことを表す信号である
    ことを特徴とする請求項１記載の車載ディスプレイ装置。     2. The in-vehicle display device according to claim 1, wherein the liquid crystal activation signal generated by the liquid crystal activation means is a signal indicating that the door of the vehicle has been opened.
  3. 　液晶起動手段で発生される液晶起動信号は、イグニッションキーが挿入されたことを表す信号である
    ことを特徴とする請求項１記載の車載ディスプレイ装置。     2. The on-vehicle display device according to claim 1, wherein the liquid crystal activation signal generated by the liquid crystal activation means is a signal indicating that an ignition key has been inserted.
  4. 　任意の時刻を設定可能な時計を備え、
    　液晶起動手段で発生される液晶起動信号は、前記時計から出力される設定時刻に至ったことを表す信号である
    ことを特徴とする請求項１記載の車載ディスプレイ装置。     It has a clock that can set any time,
    2. The on-vehicle display device according to claim 1, wherein the liquid crystal activation signal generated by the liquid crystal activation means is a signal indicating that a set time output from the timepiece has been reached.
  5. 　液晶起動手段で液晶起動信号が発生された場合にカウントを開始する第２タイマを備え、
    　電源制御部は、液晶起動手段で液晶起動信号が発生されてから電源投入手段で電源投入信号が発生される前に、前記第２タイマが所定時間をカウントした場合に、第１電源に対して前記液晶への電力供給停止を指示する
    ことを特徴とする請求項１記載の車載ディスプレイ装置。     A second timer that starts counting when a liquid crystal activation signal is generated by the liquid crystal activation means;
    When the second timer counts a predetermined time after the liquid crystal activation signal is generated by the liquid crystal activation means and before the power activation signal is generated by the power activation means, The in-vehicle display device according to claim 1, wherein an instruction to stop power supply to the liquid crystal is given.
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