JP2009162804A - Information display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display device which has a function to hold display content on a non-power supply condition, and whose security function is high. <P>SOLUTION: The information display device includes: a display means having a medium for holding the display content on the non-power supply condition; a detection means for detecting the displacement state of the display means; a prediction means for predicting a shock given to the display means on the basis of the result of detection by the detection means; and a control means for controlling the operation of the display means on the basis of the result of prediction by the prediction means. The control means erases the display content displayed on the display means when the prediction means predicts the shock given to the display means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information display device, and more particularly to an information display device having a function of holding display contents without a power source.

  In recent years, with the rapid spread of personal computers, the Internet, mobile terminals, and the like, there is an increasing demand for information display devices that obtain and display electronic information such as newspapers and books via a communication network. Specifically, electronic information is displayed on a display such as an LCD (Liquid Crystal Display) or an EL (Electro Luminescence), and humans acquire and process a lot of information via these information display devices. For this reason, an information display device that is an interface between humans and information is being developed for higher accuracy, power saving, and downsizing.

In such an information display device, a so-called electronic paper using a display medium such as a chiral nematic liquid crystal having a function (memory property) that retains the display content without a power supply and has the advantages of paper and display at present. An on-board information display device has been researched and developed (for example, see Patent Document 1). Electronic paper is electrically rewritable, and once displayed information is retained without the need for power, and has features such as less eye irritation. Therefore, the electronic paper can realize an information display device with a small battery size and excellent portability.
JP 2002-163257 A

  By the way, glass is usually used as a base material of a display. For this reason, there is a risk of being damaged weakly against impact or bending (distortion) caused by dropping. When electronic paper is used as the display medium of the display, the display content is retained even if it is damaged. If the display content is personal information or confidential information, confidential information may be leaked. is there. For example, there is a problem that there is a high risk that confidential information will be leaked, such as when requesting repair of damage.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an information display device having a high security function in an information display device having a function of holding display contents without a power source.

  The above object is achieved by the invention described in any one of 1 to 5 below.

1. Display means having a medium capable of holding display content without a power source;
Detecting means for detecting a displacement state of the display means;
Prediction means for predicting an impact on the display means based on the detection result of the detection means;
Control means for controlling the operation of the display means based on the prediction result of the prediction means,
The control means erases the display content displayed on the display means when an impact on the display means is predicted by the prediction means.

  2. 2. The information display apparatus according to 1, wherein the detection unit includes an acceleration sensor that detects an acceleration generated in the display unit.

  3. 3. The information display apparatus according to 1 or 2, wherein the detection unit includes a distortion sensor that detects distortion generated in the display unit.

  4). The control means erases the display content by painting the entire display screen of the display means in white or black when an impact on the display means is predicted by the prediction means. 4. The information display device according to any one of items 3.

  5). The medium includes at least a ferroelectric liquid crystal display element, an antiferroelectric liquid crystal display element, a ferroelectric polymer liquid crystal display element, a cholesteric liquid crystal display element, an electrochromic display element, a display element using an electrophoresis cell, and a particle movement 5. The information display device according to any one of 1 to 4, wherein the information display device is any one of a type display element, a display element that performs display by deposition and dissolution of silver, and a display element that uses a twist ball.

  According to the present invention, the control unit is configured to erase the display content displayed on the display unit when the prediction unit predicts an impact on the display unit. Therefore, for example, when the display means is predicted to be damaged due to a drop of the information display device or an external load, the display contents displayed on the display means can be erased before the display means is damaged. Thereby, even when the display means is damaged, the display content displayed on the display means is erased, so that information can be prevented from being lost and the security function can be enhanced.

  Embodiments of an information display device according to the present invention will be described below with reference to the drawings. In addition, although this invention is demonstrated based on embodiment of illustration, this invention is not limited to this embodiment.

  First, the configuration of the information display device will be described with reference to FIGS. FIG. 1 is an external front view of an information display device 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram illustrating an example of a functional outline of the information display device 1 according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the information display device 1 includes a CPU 101, a ROM 102, a RAM 103, a display driver 104, a display unit 105, a triaxial acceleration sensor 106, an operation unit 108, a wireless communication unit 109, and the like. The information display device 1 is an information display portable terminal that displays electronic information such as in-house documents in a database received via a communication network (not shown) on the display unit 105.

  The display unit 105 functions as a display unit in the present invention, and holds display contents without a power source, for example, a display device composed of a ferroelectric liquid crystal described in JP-A-10-324155. This is a so-called electronic paper having a function (memory property). Electronic paper can rewrite information electrically and consumes power only at the time of rewriting information, while it is possible to display information without consuming power after rewriting is completed. Power consumption can be suppressed. The display unit 105 displays computerized information such as in-house documents in the database received by the wireless communication unit 109 via a communication network (not shown).

  Examples of the display medium having such a memory property include, in addition to the above-described ferroelectric liquid crystal display element, an antiferroelectric liquid crystal element, a ferroelectric polymer liquid crystal display element, and a chiral nematic that exhibits a cholesteric liquid crystal phase at room temperature. Cholesteric liquid crystal display element using liquid crystal, electrochromic display element, display element using electrophoretic cell, particle movement type display element that displays powder by enclosing dry powder in a substrate and moving it by electric field, silver deposition It is also possible to use a display element that displays by melting, a display element using a twist ball, or the like.

  The display driver 104 is a drive circuit for the display unit 105 provided with a buffer memory for image signals constituting an image reproduced and displayed on the display unit 105.

  A ROM (Read Only Memory) 102 stores various control programs executed by the CPU 101.

  A RAM (Random Access Memory) 103 temporarily stores work data such as arithmetic processing and control processing.

  The wireless communication unit 109 is composed of a wireless communication device generally called a wireless LAN, and receives electronic information such as in-house documents in a database via a communication network (not shown). As the wireless communication means, Bluetooth, wireless USB, or a low power consumption type device is suitable.

  The operation unit 108 is a switch group including a power switch 108a, a cross key 108b for performing various operations and settings, and the like.

  The triaxial acceleration sensor 106 functions as a detection unit in the present invention, and detects a change in acceleration applied to each of the three axes (X, Y, and Z axes).

  The CPU 101 receives signals from the operation unit 108 and the three-axis acceleration sensor 106 and comprehensively controls display operations, image signal processing, and external information transmission / reception operations.

  Further, the CPU 101 analyzes the acceleration information acquired by the three-axis acceleration sensor 106 and calculates the tilt, movement and rotation speed and acceleration of the casing of the information display device 1 (or the display unit 105). Based on these calculation results, it is determined whether or not the information display device 1 is currently in a fall state (impact prediction), and the operation of the display unit 105 is controlled based on the prediction results. Specifically, when the information display device 1 is currently in a fall state and the CPU 101 predicts that the display unit 105 may be damaged due to an impact in the near future, the CPU 101 covers the entire display screen of the display unit 105, for example, white Or, erase the displayed content by painting (resetting) it in black. Thus, the CPU 101 functions as a control unit and a prediction unit in the present invention. For details of the impact prediction performed by the CPU 101, for example, a known method disclosed in Japanese Patent Application Laid-Open No. 2004-146036 can be used.

  Next, the flow of the erasing operation of the display content performed in the information display device 1 having such a configuration will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the flow of the display erasing operation.

  First, the CPU 101 acquires acceleration information detected by the triaxial acceleration sensor 106 (step S11). Next, the CPU 101 analyzes acceleration information acquired in accordance with the impact prediction method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2004-146036, and determines whether or not the information display device 1 is currently in a fall state. Judgment (impact prediction) is performed (step S12). When it is determined that the information display device 1 is in the fall state and the display unit 105 is damaged due to an impact in the near future (step S13; Yes), the CPU 101 controls the display driver 104 to cover the entire display screen of the display unit 105. The displayed content is erased by painting it in white or black (step S14).

  As described above, in the information display device 1 according to the embodiment of the present invention, when the CPU 101 predicts the occurrence of an impact on the display unit 105 in the near future, the display content displayed on the display unit 105 is deleted. It was. Therefore, for example, when the CPU 101 predicts that the display unit 105 is damaged due to the drop of the information display device 1 or the like, the display content displayed on the display unit 105 can be erased before the display unit 105 is damaged. . Thereby, even when the display unit 105 is damaged, the display content displayed on the display unit 105 is erased, so that information loss can be prevented and the security function can be enhanced.

  In the information display device 1 according to the above-described embodiment, the three-axis acceleration sensor 106 that detects a change in acceleration applied to each of the three axes (X, Y, and Z axes) of the display unit 105 as detection means. However, as shown in FIG. 3, a configuration may be adopted in which a strain sensor 107 that detects strain due to a load such as bending on the information display device 1 (or the display unit 105) is provided instead of the triaxial acceleration sensor 106. . FIG. 3 is a block diagram showing another example of the functional outline of the information display device 1 according to the embodiment of the present invention.

  The strain sensor 107 is formed of a piezoelectric element, and detects strain generated in the information display device 1 (or the display unit 105) from a change in voltage caused by a load such as bending.

  The flow of the display content erasing operation performed in the information display device 1 having such a configuration will be described with reference to FIG. FIG. 5 is a flowchart showing another example of the flow of the display erasing operation.

  First, the CPU 101 acquires strain information detected by the strain sensor 107 (step S21). Next, the CPU 101 analyzes the acquired distortion information and compares it with a predetermined threshold value that is smaller than the preset display unit 105 that is damaged (step S22). When the acquired distortion exceeds a preset threshold value (step S23; Yes), the CPU 101 may control the display driver 104 because the display unit 105 may be damaged, and the display screen of the display unit 105 is displayed. The displayed content is erased by painting the entire surface of the screen with white or black (step S24).

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be changed or improved as appropriate. For example, in the above-described embodiment, the detection unit is configured to include the triaxial acceleration sensor 106 or the strain sensor 107, but includes both sensors, and the CPU 101 is based on the detection results of the two sensors. The operation of the display unit 105 may be controlled. As a result, various impacts such as dropping and bending can be predicted, and the security function can be further enhanced.

1 is an external front view of an information display device according to an embodiment of the present invention. It is a block diagram which shows an example of the functional outline of an information display apparatus. It is a block diagram which shows the other example of a functional outline of an information display apparatus. It is a flowchart which shows an example of the flow of display erasure | elimination operation | movement. It is a flowchart which shows the other example of the flow of display erasure | elimination operation | movement.

Explanation of symbols

1 Information Display Device 101 CPU
102 ROM
103 RAM
104 Display Driver 105 Display Unit 106 Three-axis Acceleration Sensor 107 Strain Sensor 108 Operation Unit 108a Power Switch 108b Four-way Key 109 Wireless Communication Unit

Claims (5)

Display means having a medium capable of holding display content without a power source;
Detecting means for detecting a displacement state of the display means;
Prediction means for predicting an impact on the display means based on the detection result of the detection means;
Control means for controlling the operation of the display means based on the prediction result of the prediction means,
The control means erases the display content displayed on the display means when an impact on the display means is predicted by the prediction means. The information display apparatus according to claim 1, wherein the detection unit includes an acceleration sensor that detects an acceleration generated in the display unit. The information display apparatus according to claim 1, wherein the detection unit includes a distortion sensor that detects distortion generated in the display unit. 2. The control unit according to claim 1, wherein when the impact on the display unit is predicted by the prediction unit, the entire display screen of the display unit is painted white or black to erase the display content. 4. The information display device according to any one of items 1 to 3. The medium includes at least a ferroelectric liquid crystal display element, an antiferroelectric liquid crystal display element, a ferroelectric polymer liquid crystal display element, a cholesteric liquid crystal display element, an electrochromic display element, a display element using an electrophoresis cell, and a particle movement 5. The information display device according to claim 1, wherein the information display device is any one of a type display element, a display element that performs display by deposition and dissolution of silver, and a display element that uses a twist ball.

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