WO2016194107A1 - 表示確認装置、液晶ディスプレイ装置、メータディスプレイ、及び表示確認方法 - Google Patents
表示確認装置、液晶ディスプレイ装置、メータディスプレイ、及び表示確認方法 Download PDFInfo
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- WO2016194107A1 WO2016194107A1 PCT/JP2015/065790 JP2015065790W WO2016194107A1 WO 2016194107 A1 WO2016194107 A1 WO 2016194107A1 JP 2015065790 W JP2015065790 W JP 2015065790W WO 2016194107 A1 WO2016194107 A1 WO 2016194107A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Definitions
- the present invention relates to an apparatus and a method capable of confirming a display state of a liquid crystal display configured using a liquid crystal module.
- a system using a camera has been used as a method of confirming whether a predetermined display content is displayed at a set position for a liquid crystal display configured using a liquid crystal module.
- a liquid crystal display is photographed by a camera, and it is confirmed by image processing whether a predetermined display content is displayed at a set position.
- this system using a camera has a complicated structure because a camera separate from the liquid crystal display must be prepared and confirmation by image processing is also required.
- a method for confirming the display on the liquid crystal display without using a camera for example, in Patent Document 1, in addition to the display unit that displays an image, the alignment state of the liquid crystal in the display unit is detected by a change in capacitance.
- a configuration in which a measurement unit that outputs a measurement signal is provided in each pixel circuit is disclosed.
- Patent Document 1 it is necessary to additionally provide an element for detecting the capacitance, wiring, and the like in each of all the pixel circuits. And the pixel density cannot be increased. For this reason, the high-luminance or high-resolution liquid crystal display cannot adopt the configuration of Patent Document 1, and the technique of Patent Document 1 has a narrow range of applicable liquid crystal displays.
- the present invention has been made in order to solve the above-described problems, has a relatively simple configuration without using a separate camera, etc., and can be applied to a wide range of liquid crystal displays.
- An object is to provide a confirmation device.
- the display confirmation apparatus includes an input unit that receives a signal indicating the amount of charge of an electrode pair constituting a matrix electrode from a matrix electrode provided in the liquid crystal display, a signal that is input to the input unit, and a liquid crystal Comparing the pre-stored signal indicating the charge amount of the electrode pair measured when the display displays normally, and using the comparison result by the comparison unit, determine whether the display on the liquid crystal display is normal or abnormal And a determination unit that performs the determination.
- the present invention uses matrix electrodes provided on a liquid crystal display, it is not necessary to use a camera or the like, and display can be confirmed with a simple configuration. In addition, since comparison is performed using signals stored in advance, it is not necessary to provide an element in every pixel circuit, and the influence on transmittance and the like is reduced. Therefore, the present invention can be applied to a wide range of liquid crystal displays. Can do.
- FIG. 1 is a diagram showing an arrangement relationship between a liquid crystal module 1 and a matrix electrode 2 constituting a liquid crystal display device according to Embodiment 1 of the present invention.
- the liquid crystal display device according to the first embodiment is provided in a vehicle, for example, and displays the display contents representing various warnings such as a meter for displaying a vehicle speed, a charging warning mark, a hydraulic warning mark, and an airbag warning mark depending on the situation. It is used as a meter display that displays a still image or a flashing image.
- the liquid crystal module 1 is controlled by a later-described display control unit 5 connected to be communicable with the liquid crystal module 1 to display an image.
- the liquid crystal module 1 and the display control unit 5 constitute a liquid crystal display.
- the matrix electrode 2 is provided so as to cover the surface of the liquid crystal module 1.
- a plurality of drive electrodes and a plurality of reception electrodes are wired so as to be orthogonal to each other, and electrode pairs are formed at coordinate positions where the drive electrodes and the reception electrodes intersect each other.
- a voltage is applied to the drive electrode of the matrix electrode 2 by a detection unit 3 described later connected to the matrix electrode 2 so as to be communicable.
- One receiving electrode outputs a signal indicating the amount of charge to the detection unit 3 according to the amount of charge between the receiving electrode and the pair of drive electrodes.
- the matrix electrode 2 is not limited to a configuration in which a plurality of drive electrodes and a plurality of reception electrodes are orthogonal to each other as shown in FIG.
- the positional relationship between the matrix electrode 2 and the liquid crystal module 1 is not limited to that shown in FIG.
- the operation principle of the matrix electrode 2 is the same as that of the conventional mutual capacitive capacitive touch panel. That is, as the matrix electrode 2, a conventional mutual capacitive electrostatic touch panel may be adopted.
- FIG. 2 is a cross-sectional view of the liquid crystal module 1 and the matrix electrode 2 provided on the surface thereof. This sectional view shows the liquid crystal module 1 and the matrix electrode 2 cut along the line AA in FIG.
- FIG. 2 shows a liquid crystal module 1 of a method of switching by rotating liquid crystal molecules in a plane parallel to a display surface, which is known as an IPS (In Plane Switching (registered trademark)) method, for example.
- a liquid crystal module 1 of this type includes a plurality of TFT (Thin Film Transistor) electrodes 11 arranged on one plane, a liquid crystal 12 composed of liquid crystal molecules whose alignment state is changed by an electric field generated by the TFT electrode 11, and a TFT electrode.
- 11 includes an insulating layer 13 of the TFT electrode 11 provided on the side opposite to the liquid crystal 12 and two glasses 14 a and 14 b sandwiching the TFT electrode 11, the liquid crystal 12 and the insulating layer 13.
- FIG. 2A shows an OFF state of the liquid crystal module 1 in which no voltage is applied to the TFT electrode 11.
- the screen portion corresponding to the TFT electrode 11 to which no voltage is applied in the display screen of the liquid crystal module 1 is a black screen.
- FIG. 2B shows an ON state of the liquid crystal module 1 in which a voltage is applied to the TFT electrode 11.
- an electric field E1 is generated, the alignment state of the liquid crystal 12 is changed, and an image is displayed.
- an electric field E2 is also generated on the insulating layer 13 side.
- Application of a voltage to the TFT electrode 11 is controlled by a display control unit 5 described later.
- the electric charge generated at the receiving electrode of the matrix electrode 2 changes according to the electric field around it. Therefore, when the surrounding TFT electrode 11 generates the electric field E1, the matrix electrode 2 uses a current corresponding to the amount of charge of each electrode pair changed by the electric field E1 as a signal indicating the change in charge, which will be described later. Output to.
- the density of the electrode pairs provided on the matrix electrode 2 may be less than or equal to the pixel density of the liquid crystal display. In this way, a change in the state of the TFT electrode 11, that is, a display state of the liquid crystal module 1 is detected as a change in current by the matrix electrode 2.
- FIG. 3 is a block diagram showing the configuration of the liquid crystal display device according to Embodiment 1 of the present invention.
- the detection unit 3 operates the matrix electrode 2 to acquire a signal indicating the charge amount of each electrode pair. Then, the detection unit 3 processes the acquired signal and outputs it to the processing unit 4.
- the detection unit 3 for example, a drive 31 that applies a voltage to the matrix electrode 2, an input unit 32 that acquires a signal indicating the charge amount of each electrode pair from the matrix electrode 2, and amplifies the signal acquired by the input unit 32.
- the amplifier 33 and the AD converter 34 that performs analog-digital conversion on the signal amplified by the amplifier 33 and outputs the signal as a detection signal to the processing unit 4 are configured.
- the processing unit 4 determines whether predetermined display content is displayed at the set position on the liquid crystal module 1 using the detection signal output from the detection unit 3.
- the processing unit 4 includes an input unit 41, a comparison unit 42, and a determination unit 43.
- a signal indicating the charge amount of each electrode pair of the matrix electrode 2 in a state where an instruction for displaying predetermined display contents to be subjected to display confirmation determination is supplied to the liquid crystal module 1, A detection signal is input from the matrix electrode 2 through the detection unit 3.
- the comparison unit 42 compares the detection signal input to the input unit 41 with the detection signal to be detected when the predetermined display content is normally displayed at the set position.
- As the detection signal to be detected when the predetermined display content is normally displayed at the set position for example, what is actually measured at the time of an operation test of the liquid crystal display device is used for each electrode of the matrix electrode 2.
- Each pair is stored in advance in a memory (not shown).
- the comparison unit 42 is input to the input unit 41 with respect to each detection signal stored in the memory and indicating the charge amount of each electrode pair of the matrix electrode 2 when the display is normally performed.
- the detection signal is compared and, for example, the comparison result is output to the determination unit 43 as a difference between signal values in each electrode pair.
- the determination unit 43 uses the comparison result from the comparison unit 42 and a preset threshold value indicating a difference between signal values acceptable as a normal range to set a predetermined display content at the set position. Determine whether it is displayed normally.
- the determination result by the determination unit 43 is output to the display control unit 5 that operates the liquid crystal module 1 by applying a voltage to the TFT electrode 11 of the liquid crystal module 1.
- the processing unit 4 constitutes a display confirmation device.
- the liquid crystal module 1, the matrix electrode 2, the detection unit 3, the processing unit 4, and the display control unit 5 constitute a liquid crystal display device.
- the processing unit 4 detects whether the control unit for the entire vehicle (not shown) outputs a warning mark display instruction. For example, when an instruction to display an airbag warning mark for notifying an abnormality in the airbag system is detected, a detection signal stored when the airbag warning mark is stored in advance and a detection signal acquired from the detection unit 3 are used. Comparison is performed by the comparison unit 42, and determination is performed by the determination unit 43. Thereby, it is confirmed whether the airbag warning mark which is the display content which notifies abnormality of an airbag system is displayed normally, and is shown to the user.
- the determination result by the determination unit 43 of the processing unit 4 is output to the display control unit 5.
- the display control unit 5 displays a message on the liquid crystal module 1 according to the determination result by the determination unit 43.
- the configuration of the first embodiment is similarly applied to confirming whether a warning mark is normally displayed on a display of a building management system that monitors the operating status of equipment in a building, for example. Is possible.
- a mark that is always displayed at a specific position instead of a warning mark that is displayed only when there is an abnormality, may be a display confirmation target.
- the processing unit 4 confirms whether predetermined display content is displayed at the set position by using a detection signal indicating the amount of charge output from the detection unit 3.
- the processing unit 4 may identify the display content that is the target of display confirmation by acquiring information about the display content that the display control unit 5 is to display from the display control unit 5.
- the processing circuit may be dedicated hardware or a CPU (Central Processing Unit) that executes a program stored in a memory.
- the CPU is also called a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, and a DSP (Digital Signal Processor).
- FIG. 4A is a diagram illustrating a hardware configuration example when the functions of each unit of the processing unit 4 are realized by the processing circuit 100 which is dedicated hardware.
- the processing circuit 100 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.
- the functions of the input unit 41, the comparison unit 42, and the determination unit 43 may be realized by combining separate processing circuits 100, or the functions of the respective units may be realized by a single processing circuit 100.
- FIG. 4B is a diagram illustrating a hardware configuration example when the functions of the respective units of the processing unit 4 are realized by the CPU 102 that executes a program stored in the memory 101.
- the functions of the input unit 41, the comparison unit 42, and the determination unit 43 are realized by software, firmware, or a combination of software and firmware.
- Software and firmware are described as programs and stored in the memory 101.
- the CPU 102 implements the functions of each unit of the processing unit 4 by reading and executing the program stored in the memory 101. That is, the processing unit 4 has a memory 101 for storing a program in which steps ST2 to ST6 shown in the flowchart of FIG. These programs can be said to cause a computer to execute the procedure or method of each unit of the processing unit 4.
- the memory 101 is, for example, a nonvolatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a magnetic disk, a flexible disk, an optical disk, A compact disc, a mini disc, a DVD (Digital Versatile Disc), and the like are applicable.
- the display control unit 5 can also be realized with the same hardware configuration as the processing unit 4.
- the processing unit 4 When the processing unit 4 detects that a predetermined display content is about to be displayed, the processing unit 4 notifies the detection unit 3 to that effect. For this purpose, for example, in the case of a vehicle meter display, the processing unit 4 monitors whether a warning mark display instruction is output from a control unit (not shown) of the entire vehicle. Alternatively, the processing unit 4 acquires information about the display content that the display control unit 5 is about to display from the display control unit 5 and detects whether the predetermined display content is about to be displayed based on the information. Good. Then, as shown in FIG. 5, first, the detection unit 3 drives the matrix electrode 2 to acquire a signal indicating the charge amount of each electrode pair, and outputs the signal as a detection signal to the processing unit 4 (step ST1). .
- the detection signal output from the detection unit 3 is input to the input unit 41 of the processing unit 4 (step ST2).
- the comparison unit 42 of the processing unit 4 compares the detection signal input to the input unit 41 with a detection signal stored in advance (step ST3).
- the comparison result is output to the determination unit 43.
- whether the predetermined display content is displayed at the set position on the liquid crystal module 1 by using the comparison result output by the process of step ST3 and the preset threshold value by the determination unit 43 of the processing unit 4. Is determined (step ST4).
- the determination unit 43 of the processing unit 4 determines the determination result to that effect. Is output to the display controller 5 (step ST5).
- the determination unit 43 of the processing unit 4 determines that the predetermined display content is not displayed at the set position on the liquid crystal module 1 (step ST4; NO)
- the determination unit 43 of the processing unit 4 The determination result is output to the display control unit 5 (step ST6).
- the display control unit 5 displays a message indicating that the predetermined display content is not displayed at the set position on the liquid crystal module 1, and allows the user to recognize it.
- the entire system including the liquid crystal display device may be configured to output a warning sound from a speaker (not shown) so as to be recognized by the user.
- steps ST1 to ST6 the process of confirming whether the predetermined display content is displayed at the set position on the liquid crystal module 1 is periodically performed. In particular, it is efficient if it is performed in the same cycle as the display cycle of the liquid crystal module 1.
- FIG. 6 shows details of the processing in step ST1 shown in FIG.
- a, b, n, and m are integers of 0 or more, and n and m are constants obtained by subtracting 1 from the maximum number of electrode pairs in the X and Y directions, respectively.
- Obtain step ST12).
- the detection unit 3 amplifies and analog-digital converts the signal obtained in step ST12, and temporarily stores the value indicated by the signal obtained after the conversion in a memory (not shown). At this time, it is stored in association with the coordinate information of the electrode pair (step ST13).
- step ST14 NO
- step ST16 NO
- step ST17 the detection unit 3 finishes detecting the charge amount (step ST18).
- the detection signal which shows the value linked
- FIG. This detection signal substantially indicates the amount of charge at each electrode pair of the matrix electrode 2.
- the display state of the liquid crystal module 1 is detected as a change in the amount of charge at the matrix electrode 2 using the matrix electrode 2 and the processing unit 4 determines whether a predetermined display content is displayed at the set position.
- the detection unit 3 temporarily stores detection signals indicating the charge amount of each electrode pair, and outputs the detection signals of all the electrode pairs to the processing unit 4 collectively after the detection signals are obtained. showed that.
- the signal may be processed and output to the processing unit 4 as a detection signal associated with the coordinate information of the electrode pair. .
- FIG. 7A is a cross-sectional view when the matrix electrode 2 is incorporated in the insulating layer 13 of the liquid crystal module 1. Even with this arrangement, the matrix electrode 2 can detect the electric field E2 generated by the TFT electrode 11 as a change in the amount of charge, so that the display content by the processing unit 4 can be confirmed.
- FIG. 7B is a cross-sectional view when the matrix electrode 2 is provided not on the outside but on the inside as viewed from the glass 14a. Even in this arrangement, the matrix electrode 2 can detect the electric field E1 generated by the TFT electrode 11 as a change in the amount of charge, so that the display content by the processing unit 4 can be confirmed. In short, the matrix electrode 2 may be provided at a position where the influence of the electric field created by the TFT electrode 11 reaches.
- FIG. 8 is a cross-sectional view when the liquid crystal module 1 is of a TN (Twisted Nematic) type.
- TN liquid crystal module 1 a plurality of TFT electrodes 15 that are also arranged on one plane are opposed to a plurality of TFT electrodes 11 that are arranged on one plane with the liquid crystal 12 interposed therebetween.
- the matrix electrode 2 is provided between the TFT electrode 11 and the TFT electrode 15.
- an electric field E3 is created between the facing TFT electrodes 11 and 15, and the alignment state of the liquid crystal molecules changes.
- the matrix electrode 2 provided between the TFT electrode 11 and the TFT electrode 15 detects the generated electric field E3 as a change in charge amount. Thereafter, the display is confirmed by the processing unit 4 in the same manner as the processing described above.
- the outermost surface of the liquid crystal display device is a shield made of, for example, a transparent electrode. In this way, the installation of the shield is simple. If the shield is provided on the side opposite to the electric field generated in the liquid crystal module 1 as viewed from the matrix electrode 2 even if it is not the outermost surface, the amount of charge at the matrix electrode 2 due to factors other than the electric field of the liquid crystal module 1 can be reduced. Can be prevented.
- the matrix electrode 2 may be provided with a touch panel function by utilizing the fact that the charge amount of the matrix electrode 2 changes.
- the matrix electrode 2 is provided on the surface of the liquid crystal module 1 in a state of being sandwiched between shields 6a and 6b made of transparent electrodes, for example.
- Adhesive layers 7 a and 7 b are provided between the shields 6 a and 6 b and the matrix electrode 2.
- the matrix electrode 2 is used as a touch panel in the vertical blanking period of the liquid crystal module 1, and the matrix electrode 2 is used for display confirmation in other periods. Also good. In the vertical blanking period, the electric field generated by the liquid crystal module 1 is stable. By using the matrix electrode 2 as a touch panel during this period, the user's touch detection accuracy can be ensured.
- the configuration in which the matrix electrode 2 is provided on the surface of the liquid crystal module 1 is suitable as a configuration for confirming display for the existing liquid crystal module 1. Installation of the matrix electrode 2 is also simple.
- the configuration in which the matrix electrode 2 is incorporated in the liquid crystal module 1 can form the matrix electrode 2 in the manufacturing process of the liquid crystal module 1, and a cost reduction effect can be expected.
- the image design should be devised. Specifically, an image design in which the electric field of the liquid crystal module 1 is not generated around display contents to be subjected to display confirmation determination by the processing unit 4 is preferable.
- the surroundings of the display content to be subjected to display confirmation determination are set to a black image design.
- the processing unit 4 confirms the display contents using the detection signals indicating the charge amounts of all the electrode pairs of the matrix electrode 2 is shown.
- the display content may be confirmed using only the detection signal indicating the charge amount of the electrode pair existing in the range including the setting position where the display content to be subjected to display confirmation determination is displayed and the surrounding area.
- the matrix electrode 2 having the shape of the display content to be subjected to the display confirmation determination is provided at a position corresponding to the set position where the display content is displayed, and the determination is simply performed by comparing the detection signal with the threshold value. May be.
- the predetermined display content is a circular mark
- the shape of the matrix electrode 2 is also circular.
- the processing unit 4 determines how many of the electrode pairs of the matrix electrode 2 having a predetermined display content shape have a charge amount exceeding the threshold value, or each electrode pair of the matrix electrode 2 has. The determination is made based on whether the total value of the charge amount exceeds the threshold value.
- the threshold value to be compared is set in advance using, for example, the charge amount at each electrode pair of the matrix electrode 2 actually measured during an operation test of the liquid crystal display device or the like.
- the detection signal indicating the charge amount of each electrode pair of the matrix electrode 2 affected by the electric field generated during the operation of the liquid crystal display is supplied to the input unit 41.
- the input detection signal is compared with the detection signal prepared in advance by the comparison unit 42, and the determination unit 43 uses the comparison result to check whether a predetermined display content is displayed at the set position on the liquid crystal display. Determine.
- the electrode pair of the matrix electrode 2 may have a density equal to or lower than the pixel density of the liquid crystal display, and does not necessarily have to be provided in one-to-one correspondence with the pixels as in the prior art.
- This configuration can also be applied to a liquid crystal display desired. Therefore, the display contents can be confirmed by applying to a wide range of liquid crystal displays.
- it can be easily configured as compared with the conventional one using a separate camera or the like.
- the liquid crystal display has a liquid crystal module 1 of a type that switches by rotating liquid crystal molecules in a plane parallel to the display surface, and the matrix electrode 2 is provided on the surface of the liquid crystal module 1. Accordingly, it is possible to confirm the display contents for the existing IPS liquid crystal module 1 and to easily install the matrix electrode 2.
- the liquid crystal display has a liquid crystal module 1 of a type that switches by rotating liquid crystal molecules in a plane parallel to the display surface, and the matrix electrode 2 is incorporated in the insulating layer 13 of the liquid crystal module 1. did. Therefore, the matrix electrode 2 can be formed in the manufacturing process of the IPS liquid crystal module 1, and a cost reduction effect can be expected.
- the liquid crystal display has a twisted nematic liquid crystal module 1, and the matrix electrode 2 is provided between the TFT electrodes 11 and 15 that constitute the liquid crystal module 1 and change the alignment state of liquid crystal molecules. did. Therefore, the matrix electrode 2 can be formed in the manufacturing process of the TN liquid crystal module 1, and a cost reduction effect can be expected.
- the liquid crystal display has a liquid crystal module 1 of a method of switching by rotating liquid crystal molecules in a plane parallel to the display surface, and the matrix electrode 2 is sandwiched between two shields 6a and 6b.
- the two shields 6a and 6b provided on the surface of 1 are alternately in an active state. Therefore, it is possible to make the display content confirmation function and the touch panel function compatible with one matrix electrode 2.
- a shield is provided on the side opposite to the electric field generated in the liquid crystal display when viewed from the matrix electrode 2. Therefore, it is possible to prevent the charge amount of the matrix electrode 2 from being changed by the user's touch.
- the liquid crystal display device is a meter display. Accordingly, it is possible to confirm whether display contents representing various warnings such as a charging warning mark, a hydraulic pressure warning mark, and an airbag warning mark are normally displayed and presented to the user.
- any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.
- the display confirmation apparatus can be applied to a wide range of liquid crystal displays, it is particularly used as an apparatus for confirming the display content of a high-luminance or high-resolution liquid crystal display, for example. Is suitable.
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Abstract
Description
カメラを用いずに液晶ディスプレイの表示を確認する方法として、例えば特許文献1には、画像の表示を行う表示部に加えて、表示部の液晶の配向状態を静電容量の変化により検出して計測信号を出力する計測部を、画素回路それぞれに設ける構成が開示されている。
実施の形態1.
図1は、この発明の実施の形態1に係る液晶ディスプレイ装置を構成する液晶モジュール1とマトリックス電極2との配置関係を示す図である。実施の形態1に係る液晶ディスプレイ装置は、例えば車両に設けられて、車速をメータ表示したり、充電警告マーク、油圧警告マーク、エアバック警告マーク等の各種警告を表す表示内容を、状況に応じて静止画又は点滅画にて表示したりするメータディスプレイとして用いられる。
液晶モジュール1は、当該液晶モジュール1と通信可能に接続された後述の表示制御部5に制御されて、画像を表示する。液晶モジュール1と表示制御部5とにより、液晶ディスプレイが構成される。
なお、マトリックス電極2は、図1に示すように複数の駆動電極と複数の受信電極とが互いに直交する構成に限らず、複数の駆動電極と複数の受信電極とが互いに斜めに交差する構成であってもよい。また、マトリックス電極2と液晶モジュール1との位置関係も図1に限らず、任意の位置関係であってもよい。また、マトリックス電極2の動作原理は、従来の相互容量方式の静電式タッチパネルと同じである。つまり、マトリックス電極2として、従来の相互容量方式の静電式タッチパネルを採用してもよい。
図2に示すのは、例えばIPS(In Plane Switching(登録商標))方式として知られる、液晶分子を表示面と平行な面内で回転させてスイッチングする方式の液晶モジュール1である。この方式の液晶モジュール1は、一平面上に並んだ複数のTFT(Thin Film Transistor)電極11と、TFT電極11により発生される電界により配向状態が変化する液晶分子から成る液晶12と、TFT電極11から見て液晶12と反対側に設けられたTFT電極11の絶縁層13と、TFT電極11、液晶12及び絶縁層13を挟んだ2枚のガラス14a,14bとを有する。
図2(b)は、TFT電極11に電圧が印加されている液晶モジュール1のON状態を示す。TFT電極11に電圧が印加されることで、電界E1が発生し、液晶12の配向状態が変わり、画像が表示される。なお、TFT電極11に電圧が印加されると、絶縁層13側にも電界E2が発生する。
TFT電極11への電圧の印加は、後述の表示制御部5により制御される。
検出部3は、マトリックス電極2を動作させて、各電極対の電荷量を示す信号を取得する。そして検出部3は、取得した信号を処理して、処理部4に出力する。検出部3は、例えば、マトリックス電極2に電圧を印加するドライブ31と、マトリックス電極2から各電極対の電荷量を示す信号を取得する入力部32と、入力部32が取得した信号を増幅する増幅器33と、増幅器33により増幅された信号をアナログデジタル変換し、検出信号として処理部4に出力するADコンバータ34等で構成される。
入力部41には、表示確認判定の対象とする所定の表示内容を表示するための指示が液晶モジュール1に供給されている状態において、マトリックス電極2の各電極対の電荷量を示す信号が、マトリックス電極2から検出部3を介して検出信号として入力される。
処理部4により、表示確認装置が構成される。また、液晶モジュール1と、マトリックス電極2と、検出部3と、処理部4と、表示制御部5とにより、液晶ディスプレイ装置が構成される。
処理部4の判定部43による判定結果は、表示制御部5に出力される。表示制御部5は、判定部43による判定結果に応じて液晶モジュール1にメッセージを表示させる。
また、処理部4は、表示制御部5が表示しようとしている表示内容の情報を表示制御部5から取得することで、表示確認の対象とする表示内容を識別してもよい。
表示制御部5も、処理部4と同様のハードウェア構成にて実現可能である。
処理部4が、所定の表示内容が表示されようとしていることを検出すると、その旨を検出部3に通知する。このために、例えば車両のメータディスプレイであれば、処理部4は、不図示の車両全体の制御部から警告マークの表示指示が出力されているかを監視する。または、処理部4は、表示制御部5が表示しようとしている表示内容の情報を表示制御部5から取得し、当該情報を基に所定の表示内容が表示されようとしているかを、検出してもよい。
すると、図5に示すように、まず、検出部3は、マトリックス電極2を駆動させて、各電極対の電荷量を示す信号を取得し、検出信号として処理部4に出力する(ステップST1)。
続いて、処理部4の比較部42が、入力部41に入力された検出信号を、予め記憶されている検出信号と比較する(ステップST3)。比較結果は、判定部43に出力される。
続いて、処理部4の判定部43が、ステップST3の処理により出力された比較結果と、予め設定された閾値とを用いて、液晶モジュール1で所定の表示内容が設定位置に表示されているかを判定する(ステップST4)。
一方、処理部4の判定部43が、液晶モジュール1で所定の表示内容が設定位置に表示されていないと判定した場合(ステップST4;NO)、処理部4の判定部43は、その旨の判定結果を表示制御部5に出力する(ステップST6)。この場合、表示制御部5は、液晶モジュール1で所定の表示内容が設定位置に表示されていない旨のメッセージを表示させ、ユーザに認識させる。また、液晶ディスプレイ装置を含めたシステム全体で、不図示のスピーカから警告音を出力してユーザに認知させるように構築してもよい。
マトリックス電極2の各電極対の位置は、座標(Xi,Yj)で表され、i=0,...,a,...,n、j=0,...,b,...,mである。なお、a,b,n,mは0以上の整数であり、n,mはそれぞれX,Y方向の電極対の最大数から1を引いた定数である。
まず、検出部3は、a=0、b=0として、電荷量を検出する電極対の座標の初期値を設定する(ステップST11)。
続いて、検出部3は、ステップST12で得た信号を増幅、アナログデジタル変換するなどし、変換後に得られた信号が示す値を不図示のメモリに一時的に記憶する。このとき、電極対の座標情報と紐づけて記憶する(ステップST13)。
続いて、検出部3は、処理に使っている変数aが、a=nであるかを判定する(ステップST14)。
a=nではない場合(ステップST14;NO)、検出部3はa=a+1、また、b=bとして(ステップST15)、ステップST12の処理に戻る。
一方、a=nである場合(ステップST14;YES)、検出部3はb=mであるかを判定する(ステップST16)。
一方、b=mである場合(ステップST16;YES)、検出部3は、電荷量の検出を終える(ステップST18)。そして、ステップST13の処理により記憶されている電極対の座標情報と紐づけられた値を示す検出信号を、処理部4へ出力する。この検出信号は、マトリックス電極2の各電極対での電荷量を実質的に示している。
なお、上記では、検出部3が各電極対の電荷量を示す検出信号を一時的に記憶しておき、全ての電極対の検出信号が得られた後に、まとめて処理部4へ出力する場合を示した。しかしながら、ステップST12で1つの電極対の電荷量を示す信号を得るたびに、当該信号を処理して、電極対の座標情報と紐づけられた検出信号として処理部4へ逐一出力してもよい。
また、図7(b)は、マトリックス電極2をガラス14aから見て外側でなく内側に設けた場合の断面図である。このように配置しても、マトリックス電極2は、TFT電極11が作る電界E1を電荷量の変化として検出することができるので、処理部4による表示内容の確認が可能である。
要は、TFT電極11が作る電界の影響が及ぶ位置にマトリックス電極2を設ければよい。
図9では、マトリックス電極2を、例えば透明電極から成るシールド6a,6bに挟んだ状態で、液晶モジュール1の表面に設けている。シールド6a,6bとマトリックス電極2との間には、接着層7a,7bが設けられる。表面側のシールド6aのみをグランドに接続してアクティブとすることで、表示内容の確認機能のみ有効となる。他方のシールド6bのみをグランドに接続してアクティブとすることで、タッチパネル機能のみ有効となる。シールド6a,6bのアクティブ状態を交互に切替えて、1つのマトリックス電極2で表示内容の確認機能とタッチパネル機能とを実現する。
一方、図7及び図8のように、液晶モジュール1の内部にマトリックス電極2を組み込む構成は、液晶モジュール1の製造工程でマトリックス電極2を形成することができ、コスト低減効果が期待できる。
Claims (9)
- 液晶ディスプレイに設けられたマトリックス電極から、前記マトリックス電極を構成する電極対の電荷量を示す信号が入力される入力部と、
前記入力部に入力された前記信号と、前記液晶ディスプレイが正常に表示をした場合に計測された前記電極対の電荷量を示す予め記憶された信号とを比較する比較部と、
前記比較部による比較結果を用いて、前記液晶ディスプレイの表示の正常異常を判定する判定部とを備えることを特徴とする表示確認装置。 - 前記マトリックス電極と、
前記液晶ディスプレイと、
請求項1記載の表示確認装置とを備えることを特徴とする液晶ディスプレイ装置。 - 前記液晶ディスプレイは、液晶分子を表示面と平行な面内で回転させてスイッチングする方式の液晶モジュールを有し、
前記マトリックス電極は、前記液晶モジュールの表面に設けられていることを特徴とする請求項2記載の液晶ディスプレイ装置。 - 前記液晶ディスプレイは、液晶分子を表示面と平行な面内で回転させてスイッチングする方式の液晶モジュールを有し、
前記マトリックス電極は、前記液晶モジュールの絶縁層に組み込まれていることを特徴とする請求項2記載の液晶ディスプレイ装置。 - 前記液晶ディスプレイは、ねじれネマティック方式の液晶モジュールを有し、
前記マトリックス電極は、前記液晶モジュールを構成して液晶分子の配向状態を変化させる電極間に設けられていることを特徴とする請求項2記載の液晶ディスプレイ装置。 - 前記液晶ディスプレイは、液晶分子を表示面と平行な面内で回転させてスイッチングする方式の液晶モジュールを有し、
前記マトリックス電極は、2つのシールドに挟まれた状態で前記液晶モジュールの表面に設けられ、
前記2つのシールドは、交互にアクティブ状態になることを特徴とする請求項2記載の液晶ディスプレイ装置。 - 前記マトリックス電極から見て前記液晶ディスプレイに発生する電界と反対側にシールドが設けられていることを特徴とする請求項2記載の液晶ディスプレイ装置。
- 前記マトリックス電極と、
前記液晶ディスプレイと、
請求項1記載の表示確認装置とを備えることを特徴とするメータディスプレイ。 - 入力部が、液晶ディスプレイに設けられたマトリックス電極から、前記マトリックス電極を構成する電極対の電荷量を示す信号を入力される入力ステップと、
比較部が、前記入力ステップにより入力された前記信号と、前記液晶ディスプレイが正常な表示をした場合に計測された前記電極対の電荷量を示す予め記憶された信号とを比較する比較ステップと、
判定部が、前記比較ステップによる比較結果を用いて、前記液晶ディスプレイの表示の正常異常を判定する判定ステップとを備えることを特徴とする表示確認方法。
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PCT/JP2015/065790 WO2016194107A1 (ja) | 2015-06-01 | 2015-06-01 | 表示確認装置、液晶ディスプレイ装置、メータディスプレイ、及び表示確認方法 |
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JP2018124535A (ja) * | 2017-02-03 | 2018-08-09 | 株式会社ジャパンディスプレイ | 表示装置 |
JP2020016695A (ja) * | 2018-07-23 | 2020-01-30 | ローム株式会社 | 異常検知回路 |
US11320923B2 (en) | 2017-02-03 | 2022-05-03 | Japan Display Inc. | Control circuit for a display apparatus |
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