JP2011007833A - Method of driving display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of driving a display device by which more scrupulous power saving can be attained in a light emitting type or a light receiving type display device.SOLUTION: The method of driving the display device 100 includes a sheet type display part 130 having a display region 110a in which a plurality of pixels are provided. The display part 130 is a light emitting type and includes a sensor detecting whether contact for the display part 130 by human body or the like is performed or not, or whether display in pixels are a shielding state or not according to the contact with the human body, when it is judged that contact is performed or display is shielded based on output from the sensor during drive of the display part 130, pixels of at least contact parts 111a, 111b are put-out or dimmed out.

Description

  The present invention relates to a display device driving method.

  As a method of driving the display device, the human body detection sensor disposed on the front side of the liquid crystal display panel detects the approaching or moving away of the human body from the liquid crystal display panel, and the backlight is turned on, turned off, or reduced. A liquid crystal image display device having a backlight lighting control circuit for controlling light is known (Patent Document 1).

  The liquid crystal image display device includes the backlight lighting control circuit so as to extend the lifetime of the backlight in addition to the power saving effect.

  As another method of driving the display device, the display panel, a plurality of sensing units that generate a sensing output signal based on contact with the display panel, and the presence or absence of contact based on the sensing output signal are determined and operated. A driving method of a display device having a first contact determination unit and a second contact determination unit is known (Patent Document 2).

  The driving method of the display device of Patent Document 2 intends to reduce power consumption by appropriately using the power saving mode operation in the first contact determination unit and the normal mode operation in the second contact determination unit.

JP-A-8-212360 JP 2007-87393 A

  In the liquid crystal image display device of Patent Document 1, lighting, extinguishing, or dimming of the backlight over the entire surface of the liquid crystal display panel is controlled. Further, in the driving method of the display device of Patent Document 2, two driving modes (power saving mode and normal mode) for the entire display panel are selectively used. That is, in the control or driving method in these display devices, relatively simple driving control is performed, and in portable information equipment using a battery or the like as a power source, power saving is achieved by more detailed driving control. It is demanded.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A display device driving method according to this application example is a driving method of a display device including a sheet-like display portion having a display region provided with a plurality of pixels, and the display portion is self-luminous. A sensor for detecting whether or not there is contact with the display unit by a human body or the like, or whether or not the display in the pixel is in a shielded state due to contact with the human body or the like, When it is determined that the contact is present or the display is shielded based on the output from the sensor during driving, at least the pixel at the contact portion is turned off or dimmed.

  According to this method, it is possible to save power as a fine power-saving state by extinguishing or dimming at least a pixel at a contact site.

Application Example 2 In the display device driving method according to the application example described above, at least one of the pixels adjacent to the pixel at the contact portion may be turned off or dimmed.
According to this method, it is possible to further save power by setting the power saving state to such an extent that it does not hinder the visual recognition of the display.

Application Example 3 In the driving method of the display device according to the application example, the display area is driven and controlled by being divided into a plurality of areas, and the area including the pixel of the contact part is turned off or dimmed. Good.
According to this method, it is possible to actively expand the range of the power saving state and further save power.

Application Example 4 In the display device driving method according to the application example described above, when it is determined that the contact has continued for a predetermined time, all of the display area including the pixel of the contact part is turned off or dimmed. Is preferred.
Since it is determined that the display is not visually recognized in a state where contact with the display unit by a human body or the like continues for a predetermined time, the entire display area is turned off or dimmed, so that power can be efficiently saved.

Application Example 5 In the display device driving method according to the application example described above, the display device includes a plurality of the display units with one end bound, and one of the at least two display units includes the other display unit. When overlapped, at least a part of the display area of the one display unit where the other display unit overlaps is extinguished or dimmed.
According to this method, the power saving state can be achieved by assuming the overlap between the display units that may occur when a plurality of display units are provided, so that power can be efficiently saved.

Application Example 6 In the driving method of the display device according to the application example described above, the pixel of the one display unit in a portion where the other display unit overlaps may be turned off or dimmed.
According to this method, a portion that does not contribute to the display can be reliably saved as a power saving state to save power.

Application Example 7 In the driving method of the display device according to the application example, when it is determined that the overlap of the other display unit with the one display unit has continued for a predetermined time, the display of the one display unit is performed. All of the area may be turned off or dimmed.
According to this method, it is possible to save useless display power in consideration of the passage of time due to overlapping of the display units.

  Application Example 8 Another method for driving a display device according to this application example is a method for driving a display device including a sheet-like display unit having a display region in which a plurality of pixels are provided. It is a light-receiving type, and is disposed immediately below the display unit and has at least a plurality of light sources that illuminate the display area, and whether there is contact with the display unit by a human body or the like, or contact with a human body or the like And a sensor for detecting whether or not the display in the pixel is in a shielded state, and the touch is present or the display is shielded based on an output from the sensor during driving of the display unit. When it is determined that the light source has been turned off, at least the light source at the contact portion is turned off or dimmed.

  According to this method, it is possible to save power by setting the illuminating device in a power saving state with at least the light source of the contact portion as a unit.

Application Example 9 In the display device driving method according to the application example described above, at least one of the light sources adjacent to the light source at the contact portion may be turned off or dimmed.
According to this method, it is possible to further save power by setting the lighting device in a power saving state to such an extent that it does not hinder display visual recognition.

Application Example 10 In the display device driving method according to the application example described above, the illumination device is controlled to illuminate the display region in a plurality of regions, and at least one light source is provided for each region. And the light source provided in the region including the contact part may be turned off or dimmed.
According to this method, it is possible to actively expand the range of the power saving state in the lighting device, and to further save power.

Application Example 11 In the method of driving the display device according to the application example described above, the display device includes a plurality of the display units with one end bound, and one of the at least two display units includes the other display unit. When overlapped, at least one of the light sources of the illumination device of the one display unit on which the other display unit overlaps is turned off or dimmed.
According to this method, it is possible to save power efficiently because the lighting device is put into a power saving state assuming overlap between display units that may occur when a plurality of display units are provided.

Application Example 12 In the display device driving method according to the application example described above, the light source in a portion where the other display unit of the illumination device of the one display unit overlaps may be turned off or dimmed.
According to this method, it is possible to reliably save power by setting the light source of the illumination device corresponding to the portion not contributing to display to a power saving state.

Application Example 13 In the driving method of the display device according to the application example, when it is determined that the overlap of the other display unit with the one display unit has continued for a predetermined time, the illumination of the one display unit It is preferred that all the light sources in the device are turned off or dimmed.
According to this method, it is possible to save useless power for illumination in the illumination device in consideration of the passage of time due to overlapping of the display units.

Application Example 14 In the driving method of the display device according to the application example, the sensor uses at least one of light detection, pressure detection, and capacitance detection.
Regardless of whether the display unit is a self-luminous type or a light-receiving type by applying or combining well-known detection technology, the display of the pixel due to contact with the display unit by the human body or the like, or contact with the human body etc. is shielded Can be detected.

FIG. 2 is a schematic plan view illustrating the configuration of the display device according to the first embodiment. FIG. 2 is a schematic cross-sectional view illustrating the structure of the display device according to the first embodiment taken along line AA ′ in FIG. 1. FIG. 2 is a block diagram illustrating an electrical configuration of the display device according to the first embodiment. FIG. 3 is a schematic diagram illustrating a driving method of the display device according to the first embodiment. FIG. 6 is a schematic diagram illustrating a driving method of the display device according to the second embodiment. FIG. 10 is a schematic diagram illustrating a driving method of the display device according to the third embodiment. FIG. 6 is a schematic plan view illustrating a configuration of a display device according to a second embodiment. The schematic sectional drawing which shows the structure of the display apparatus of Embodiment 2 cut | disconnected by the BB 'line | wire of FIG. FIG. 6 is a block diagram illustrating an electrical configuration of a display device according to a second embodiment. FIG. 10 is a schematic diagram illustrating a driving method of the display device according to the fourth embodiment. FIG. 6 is a schematic diagram illustrating a method for driving a display device according to a fifth embodiment. (A) And (b) is a perspective view which shows the structure of the display apparatus of Embodiment 3. FIG. FIG. 9 is a perspective view illustrating a driving method of the display device according to the third embodiment. The schematic sectional drawing which shows the structure of the display apparatus of a modification.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.

(Embodiment 1)
First, a configuration of a display device to which the display device driving method of the present embodiment is applied will be described with reference to FIGS. FIG. 1 is a schematic plan view showing the configuration of the display device according to the first embodiment, FIG. 2 is a schematic sectional view showing the structure of the display device according to the first embodiment, taken along the line AA ′ in FIG. 1, and FIG. It is a block diagram which shows the electric constitution of 1 display apparatus.

  As shown in FIG. 1, the display device 100 according to the present embodiment includes a display unit 130 that includes a display panel 110 having a rectangular outer shape. The display panel 110 has a display area 110a provided with a plurality of pixels 15 capable of displaying three colors, R (red), G (green), B (blue). The plurality of pixels 15 has a so-called stripe arrangement in which pixels 15 of the same color among the three colors are arranged in the direction along the short side in the display area 110a. Note that the arrangement of the pixels 15 is not limited to this.

  A plurality of (three) terminal portions 10a provided along the long side of the display panel 110 are connected to a display control unit 131 (see FIG. 3) for driving and controlling the display panel 110. Relay boards 120A, 120B, and 120C are mounted. The relay boards 120A, 120B, and 120C are, for example, flexible circuit boards (FPCs), and those on which electronic components such as driver ICs that constitute a part of the drive circuit that drives the display panel 110 are mounted are used. can do.

  As shown in FIG. 2, the display unit 130 of the display device 100 has a structure in which the display panel 110 on which the relay substrate 120A is mounted is sandwiched between the resin film 40A and the resin film 40B.

  The display panel 110 includes an element substrate 10 having an organic electroluminescence element 11 (hereinafter referred to as an organic EL element 11) as a light emitting element provided corresponding to each pixel 15, and also corresponding to each pixel 15. The sealing substrate 20 having the color filter 21 provided with the provided colored layer is joined by a sealing material 30 via a sealing resin 35 having visible light permeability. The organic EL element 11 emits white light, and has a so-called top emission structure that enables color display when the white light passes through the color filter 21 and is emitted from the sealing substrate 20 side.

  The element substrate 10 is provided with a drive circuit (not shown) for driving the organic EL element 11 for each pixel 15, and the organic EL element 11 is formed on the drive circuit. The driving circuit includes a switching element such as a thin film transistor, wiring connected to the switching element, and the like, and a known configuration can be adopted.

  Further, the drive circuit includes a sensor 13 provided for each pixel 15. The sensor 13 can be composed of a semiconductor film or an insulating film that constitutes the above-described thin film transistor, a conductive film that constitutes a wiring, or the like, for example, a photodetecting element or a pressure-sensitive resistor having a photosensitive semiconductor film. It is composed of at least one of an element and a capacitance element that detects a change in capacitance.

  In the self-luminous display panel 110 having the light emitting elements as described above, the element substrate 10 can be a transparent substrate such as glass or resin, or an opaque substrate such as silicon or ceramic. On the other hand, the sealing substrate 20 on the side where light emitted from the organic EL element 11 is taken out is made of a transparent substrate such as glass or resin.

In the present embodiment, a transparent glass substrate is used for both the element substrate 10 and the sealing substrate 20, and after the element substrate 10 and the sealing substrate 20 are joined, the surfaces thereof are subjected to mechanical or chemical polishing. Thus, processing for reducing the thickness of each substrate is performed. For example, the original thickness of each substrate is approximately 0.5 mm. And it grind | polishes so that the total thickness after a process may be set to about 300 micrometers or less. Therefore, the display panel 110 itself has a certain degree of flexibility.
Therefore, the display panel 110 itself needs to be weak against external impact and to prevent scattering when it is damaged by the impact. In addition, since the organic EL element 11 is used as the light emitting element, the resin film 40A having the same flexibility is used for the purpose of preventing the entry of moisture and the like from the outside by securing a sealed structure and securing a longer light emitting life. Laminated with 40B.

The resin film 40A used for laminating has an adhesive layer 42A formed by uniformly applying an adhesive on one surface of a transparent base film 41A having low gas permeability. Similarly, the resin film 40B has an adhesive layer 42B formed by uniformly applying a transparent adhesive on one surface of a transparent base film 41B having low gas permeability.
As base film 41A, 41B, the film which consists of resin, such as polyester, such as PET (polyethylene terephthalate) and PEN (polyethylene naphthalate), PES (polyether sulfone), PC (polycarbonate), PE (polyethylene), for example is mentioned. It is done. Its thickness is about 50 μm.
As the adhesive, for example, a thermosetting epoxy resin can be used. Moreover, it is good also as an adhesive which has adhesiveness. Repair properties can be realized by using an adhesive.

  The display panel 110 is sandwiched so that the adhesive layers 42A and 42B face each other, and the two resin films 40A and 40B are laminated. Further, in order to ensure moisture resistance of the organic EL element 11, in other words, sealing properties, the spaces 43 and 44 that may be generated around the display panel 110 during lamination are filled with a sealing resin. . In other words, the display panel 110 is laminated together with the sealing resin, and a part 45 of the protruding sealing resin is raised on the end surfaces of the resin films 40A and 40B.

  A relay substrate 120A is mounted on the terminal portion 10a of the element substrate 10 using an anisotropic conductive film (ACF) 7A. The surface of the relay substrate 120A excluding the connecting portion is covered with an insulating protective film such as polyimide or solder resist to ensure the adhesion between the adhesive layers 42A and 42B of the resin films 40A and 40B and the protective film. In order to do this, intermediate adhesive layers 8A and 9A showing adhesiveness are provided at both interfaces.

  The display unit 130 having such a configuration is a so-called sheet shape (plate shape), and the display surface can be curved by following external stress to some extent.

  Since the display panel 110 includes the organic EL element 11 having a top emission structure, it is not necessary to extract light from the element substrate 10 side. Therefore, the resin film 40B covering the element substrate 10 side does not need to be transparent, and may be an opaque resin film provided with a heat conductor such as a metal thin film that can be laminated. It is possible to dissipate heat generated by the light emission of the organic EL element 11 by the heat conductor.

  Next, the electrical configuration of the display device 100 will be described. As shown in FIG. 3, the display device 100 includes a display unit 130, a display control unit 131 that receives the display signal and controls the display unit 130, and an AC (alternating current) or DC (direct current) external power source. And a power supply circuit 132 that supplies driving power to the display control unit 131.

  The display control unit 131 turns on the R, G, and B organic EL elements 11 in response to the input of the display signal. Further, the organic EL element 11 can change the luminance (intensity) of light emission depending on the amount of current flowing therethrough. Therefore, the display control unit 131 can not only turn on and off each organic EL element 11, but also can turn on the display with a lower luminance by reducing the amount of current compared to when the organic EL element 11 is turned on. Hereinafter, the lighting state with such a low luminance is referred to as dimming.

As described above, the sensor 13 is composed of at least one of a light detection element, a resistance element, and a capacitance element, and the display of the pixel 15 due to contact with the display unit 130 by a human body or the like or contact with the human body or the like is shielded. The status can be detected.
In the display device 100 having such a configuration, the display control unit 131 refers to the output signal from the sensor 13 to control the light emission of the organic EL element 11 constituting the pixel 15, thereby realizing power saving. ing. A detailed driving method of the display device 100 will be described.

<Driving method of display device>
A driving method of the display device 100 according to the present embodiment will be described with reference to FIGS. 4 is a schematic diagram illustrating a method for driving the display device according to the first embodiment, FIG. 5 is a schematic diagram illustrating a method for driving the display device according to the second embodiment, and FIG. 6 is a schematic diagram illustrating a method for driving the display device according to the third embodiment. It is.

Example 1
As shown in FIG. 4, in the driving method of the display device 100 according to the first embodiment, when the sheet-like display unit 130 is picked up, the contact is detected by the sensor 13 and the display control unit 131 detects the contact part. The organic EL element 11 of the pixel 15 is turned off or dimmed.

  In this case, the thumb touches the display area 110a (that is, the display surface) of the display unit 130 or shields the display surface. The part where the thumb is in contact is defined as a contact part 111a. On the other hand, the remaining four fingers from the index finger to the little finger are in contact with the back side of the display unit 130. A site where four fingers are in contact is defined as a contact site 111b.

  The sensor 13 detects the contact or the state where the display surface is shielded, and sends an output signal to the display control unit 131. The display control unit 131 refers to this output signal and turns off or dims the organic EL element 11 of the pixel 15 corresponding to the contact parts 111a and 111b.

  Such extinguishing or dimming of the organic EL element 11 can reduce the power required to drive the display device 100. Further, from the viewpoint of ensuring the visibility of display, only the organic EL element 11 of the pixel 15 in the contact portion 111a shielded by the thumb may be turned off or dimmed.

(Example 2)
As shown in FIG. 5, the driving method of the display device 100 according to the second embodiment includes at least one organic EL element 11 adjacent to the organic EL element 11 of the pixel 15 at the contact portions 111a and 111b with respect to the first embodiment. It is a method of turning off or dimming. This further expands the power saving range. Specifically, referring to the output signal of the sensor 13 with respect to the planar arrangement coordinate data of the organic EL element 11 in the display area 110a, the planar maximum range of the portion in contact with the hand (finger) is specified. . For example, the pixel 15 in the rectangular region 112a including the thumb contact part 111a (FIG. 4) is turned off or dimmed. Alternatively, the rectangular region 112b including the contact portion 111b (FIG. 4) of the four fingers is turned off or dimmed.
As described in the first embodiment, from the viewpoint of ensuring the visibility of display, only the region 112a may be turned off or dimmed.

  According to the driving method of the display device 100 of the first embodiment and the second embodiment, the sensor detects a state in which the human body (hand) is in contact with the display unit 130 or the display is shielded due to the contact of the human body (hand). 13, the display control unit 131 turns off or reduces the organic EL elements 11 of the plurality of pixels 15 included in at least one of the contact part 111 a and the contact part 111 b or one of the area 112 a and the area 112 b. By saving light, power saving can be achieved.

  From the viewpoint of detecting contact by the human body, the sensor 13 includes temperature (infrared) detection, magnetic (magnetic field) detection, in addition to light (light having a wavelength in the visible light region) detection, pressure detection, and capacitance detection. A method (element) can also be employed.

(Example 3)
The driving method of the display device 100 according to the third embodiment is a power saving method in consideration of contact other than the human body with respect to the human body contact according to the first and second embodiments. For example, as illustrated in FIG. 6, it is assumed that a shielding object such as paper or a notebook is superimposed on the display unit 130 as a contact object other than the human body. In such a case, the display control unit 131 refers to the output signal from the sensor 13 and turns off or dims the organic EL element 11 of the pixel 15 in the region 113a whose display is shielded by the shielding object.

  According to the third embodiment, it is possible to save power by giving priority to display visibility so that the region 113a where the display is not visible is not displayed or cannot be viewed.

The extinction or dimming of the organic EL element 11 as the light emitting element in Examples 1 to 3 is dimmed in the initial stage when the contact or display is shielded, and a predetermined time (several tens of seconds) has elapsed. When it is done, it is preferable to turn off the light.
In particular, the organic EL element 11 may generate heat as light is emitted, and the heat generation can be suppressed by turning off the organic EL element 11 in a region where the human body (hand) contacts or a peripheral region including the region. Low-temperature burns can be prevented when the human body is in contact with the display unit 130 for a long time.

When there is a possibility that the power consumption may be increased by frequently turning off or dimming the organic EL element 11, the state where the contact or display is shielded continues for a predetermined time (for example, about 5 minutes). All the organic EL elements 11 may be turned off or dimmed.
The predetermined time can be arbitrarily set according to the usage method of the display device 100.

(Embodiment 2)
Next, a display device according to another embodiment and a driving method thereof will be described with reference to FIGS. 7 is a schematic plan view illustrating the configuration of the display device according to the second embodiment, FIG. 8 is a schematic cross-sectional view illustrating the structure of the display device according to the second embodiment, taken along line BB ′ of FIG. 7, and FIG. FIG. 10 is a schematic diagram illustrating a driving method of the display device according to the fourth embodiment, and FIG. 11 is a schematic diagram illustrating a driving method of the display device according to the fifth embodiment.

  As shown in FIG. 7, the display device 200 of the present embodiment includes a display unit 170 that includes a display panel 150 having a rectangular outer shape. The display panel 150 includes a display region 150a provided with a plurality of pixels 55 capable of displaying three colors, R (red), G (green), B (blue). The plurality of pixels 55 are arranged in a stripe shape in the display region 150a.

A plurality of (three) terminal portions 50a provided along the long side of the display panel 150 are connected to a display control unit 171 (see FIG. 9) for driving and controlling the display panel 150. Relay boards 160A, 160B, and 160C are mounted. The relay boards 160A, 160B, and 160C are, for example, flexible circuit boards (FPCs), and those on which electronic parts such as driver ICs that constitute a part of the drive circuit that drives the display panel 150 are mounted are used. can do.
The display device 200 according to the present embodiment has the same configuration as the display device 100 according to the first embodiment in plan view, but the display panel 150 is a light receiving type, and the back side (directly below) the display panel 150. Is provided with an illumination device (backlight; B / L) for illuminating it. In addition, other relay boards (not shown) are mounted on the relay boards 160A, 160B, and 160C in order to achieve electrical connection with the B / L control unit 173 (see FIG. 9) that drives and controls the lighting device. Yes. Details will be described with reference to FIG.

  As shown in FIG. 8, the display unit 170 of the display device 200 includes a resin film 40 </ b> A and a resin film 40 </ b> B that are formed by stacking a display panel 150 on which a relay substrate 160 </ b> A is mounted and a lighting device 90 that illuminates the display panel 150. It has a structure laminated between.

The display panel 150 is a liquid crystal panel, and is sandwiched, for example, between a device substrate 50 and a counter substrate 60 as a pair of substrates, and a gap between the device substrate 50 and the counter substrate 60 bonded via a sealing material 70. And a liquid crystal layer 80.
On the element substrate 50 on the liquid crystal layer 80 side, a pixel electrode 51 provided for each pixel 55, a drive circuit for driving the pixel electrode 51, and an alignment film 56 covering the plurality of pixel electrodes 51 are provided.

  Further, the drive circuit includes a sensor 53 provided for each pixel 55. The sensor 53 includes, for example, at least one of a light detection element having a light-sensitive semiconductor film, a pressure-sensitive resistance element, and a capacitance element that detects a change in capacitance, and includes a drive circuit. The thin film transistor can be composed of a semiconductor film, an insulating film, a conductive film that forms a wiring, or the like.

  On the liquid crystal layer 80 side of the counter substrate 60, a color filter 61 having a colored layer provided for each pixel 55, a common electrode 62 provided on the color filter 61, and an alignment film 63 covering the common electrode 62 are provided. It has been.

  An upper polarizing plate 64 is attached to the surface of the counter substrate 60 opposite to the liquid crystal layer 80. Similarly, a lower polarizing plate 57 is attached to the surface of the element substrate 50 opposite to the liquid crystal layer 80.

  As an optical design condition for such a display panel 150, a normally black mode in which black is displayed when not driven is employed. Therefore, when the display panel 150 is not driven, the illumination light of the illumination device 90 cannot pass through the display panel 150. However, the present invention is not limited to this, and the optical design condition may be a normally white mode in which white display is performed when not driven.

  The lighting device 90 includes a mounting substrate 92 and a plurality of light sources 91 that are arranged and mounted on the mounting substrate 92 substantially evenly. The light source 91 is a light emitting element such as an LED or an organic EL element that is close to a point light source. The illuminating device 90 is disposed immediately below the display panel 150 on the element substrate 50 side, and is in a state in which it can be illuminated almost uniformly over at least the display region 150a. Hereinafter, the lighting device 90 may be referred to as a B / L (backlight) 90.

  A connection terminal (not shown) is provided at one end of the mounting substrate 92 on which the light source 91 is mounted, and one end of the relay substrate 161A is electrically connected. The other end of the relay substrate 161A is electrically connected to one surface of the relay substrate 160A mounted on the terminal portion 50a of the element substrate 50. The electrical connection method is, for example, by soldering.

  The display panel 150 is thinned by bonding the element substrate 50 and the counter substrate 60 and sealing liquid crystal in the gap, and then performing mechanical or chemical polishing. Also in this case, like the display panel 110 of the first embodiment, the original thickness of each substrate is about 0.5 mm, and the display panel 150 is polished so that the thickness is about 300 μm or less. After the polishing process, an upper polarizing plate 64 and a lower polarizing plate 57 are attached.

  The mounting board 92 in the lighting device 90 may be a rigid circuit board or a flexible circuit board, but a thin circuit board of 100 μm or less is also preferable.

  The sheet-like display unit 170 obtained by laminating the laminated body of the display panel 150 and the lighting device 90 with the resin films 40A and 40B so that the adhesive layers 42A and 42B face each other is also resistant to external stress. It is flexible enough to bend.

  As shown in FIG. 9, the display device 200 includes a display unit 170, a display control unit 171 that drives and controls the display unit 170 in response to an input of a display signal, and a B / L control unit 173 that drives and controls the B / L 90. And a power supply circuit 172 that receives power supplied from an AC (alternating current) or DC (direct current) external power source and supplies driving power to the display control unit 171 and the B / L control unit 173.

  The display control unit 171 lights up the R, G, and B pixels 55 in response to the input of the display signal. Specifically, a potential for driving the liquid crystal layer 80 is applied between the common electrode 62 and the desired pixel electrode 51.

As described above, the sensor 53 is composed of at least one of a light detection element, a resistance element, and a capacitance element, and the display of the pixel 55 due to contact with the display unit 170 by a human body or the like or contact with the human body or the like is shielded. The status can be detected.
In the display device 200 having such a configuration, the display control unit 171 controls the lighting of the pixel 55 with reference to the output signal from the sensor 53. Similarly, the B / L control unit 173 controls the light emission of the light source 91 with reference to the output signal from the sensor 53. Thereby, power saving is realized. A detailed driving method of the display device 200 will be described based on the fourth and fifth embodiments.

<Driving method of other display device>
Example 4
As shown in FIG. 10, in the driving method of the display device 200 in Example 4 of the present embodiment, when the sheet-like display unit 170 is picked up, the contact is detected by the sensor 53, and B / L The control unit 173 turns off or dims the light source 91 at the contact site.

  The thumb touches the display area 150a (that is, the display surface) of the display unit 170 or shields the display surface. The remaining four fingers from the index finger to the little finger are in contact with the back side of the display unit 170.

  The sensor 53 detects the contact or the state where the display surface is shielded and sends an output signal. The B / L control unit 173 refers to this output signal and turns off or dims the light source 91 corresponding to, for example, the contact portion 151a with which the thumb is in contact. Although the arrangement of the light sources 91 in the display area 150a is arranged so that the distances between the light sources 91 are equal, the arrangement density of the sensors 53 provided for each pixel 55 is higher. When the light source 91 corresponding to the portion 151a is turned off or dimmed, the range becomes a substantially semicircular shape with a side portion taken by the hand as one side.

  Such extinguishing or dimming of the lighting device 90 can reduce the power required to drive the display device 200. Further, from the viewpoint of ensuring the visibility of the display, only the light source 91 of the contact portion 151a shielded by the thumb may be turned off or dimmed. However, the organic matter of the first embodiment is considered in consideration of heat radiation from the light source 91. Similarly to the lighting control of the EL element 11, the light source 91 of the contact portion 151b of the four fingers in contact with the back side of the display unit 170 may be further turned off or dimmed. According to this, further power saving can be achieved.

(Example 5)
As shown in FIG. 11, in the driving method of the display device 200 in Example 5 of the present embodiment, the illumination of the display region 150a by the illumination device 90 can be divided into a plurality of (for example, three) regions so that the illumination is possible. Then, when the sheet-like display unit 170 is picked up by the hand, the contact is detected by the sensor 53, and the B / L control unit 173 is a portion where the hand (thumb) is in contact among a plurality (three) regions. The light source 91 in the region 152a including is turned off or dimmed.

  According to the driving method of the display device 200 of the fifth embodiment, it is possible to positively expand the range of extinguishing or dimming of the lighting device 90 to further save power. Note that the number (three) of regions in which illumination can be controlled is not limited to this.

  Moreover, in Example 4 and Example 5, in addition to the control of the illumination device 90 by the B / L control unit 173, the display control unit 171 refers to the output signal of the sensor 53, whereby the contact part 151a and the contact part 151b The operation of writing the display signal to the pixels 55 included in any of the regions 152a may be controlled to be interrupted. Although it is small compared with the power consumption of the illuminating device 90, the power consumption by writing operation | movement can be reduced.

  Furthermore, in the drive control of the illumination device 90 of the fourth and fifth embodiments, the light source 91 is dimmed at an initial stage in a state where the human body (hand) is in contact with the display unit 170 or the display is shielded, and the predetermined time is reached. It is preferable to turn off the light when it has passed (about several tens of seconds). That is, the display can be visually recognized to some extent even in the initial stage of power saving.

  When there is a possibility that the power consumption of the lighting device 90 may be increased by frequently turning off or dimming the light source 91, the state where the contact or display is shielded continues for a predetermined time (for example, about 5 minutes). Sometimes all the light sources 91 may be turned off or dimmed.

(Embodiment 3)
Next, the display device of Embodiment 3 and the driving method thereof will be described with reference to FIGS. 12A and 12B are perspective views showing the display device of the third embodiment, and FIG. 13 is a perspective view showing a driving method of the display device of the third embodiment.

  As shown in FIG. 12A, the display device 1000 according to the present embodiment has a plurality of display devices 100 according to the first embodiment housed in a main body 1100. Also, as shown in FIG. 12B, two sheet-like display units 130 are bonded together so that the display area (display surface) 110a faces outward to form one display unit. Hereinafter, such display units are referred to as display units 100A, 100B, 100C, and 100D.

  Each display unit 100A, 100B, 100C, and 100D has one end, that is, the side on which the relay boards 120A, 120B, and 120C (see FIG. 1) are provided fixed to the connection unit 1120 of the main body 1100, and the connection unit 1120. Are electrically connected to the display control unit 131.

  The main body 1100 can be opened around the connection portion 1120, and the display portions 100A, 100B, 100C, and 100D can be turned as if they were pages of a book. A main body 1100 corresponding to a book cover includes a display control unit 131, a storage unit (not shown) such as a flash memory for temporarily storing display information, a power supply circuit 132, and a small battery such as a lithium ion battery as a power source. A secondary battery (not shown) and the like are incorporated.

<Driving method of display device>
As shown in FIG. 13, the driving method of the display device 1000 is the same as the driving method of Examples 1 to 3 in the driving method of the display device 100 in the first embodiment described above for the individual display units 100A, 100B, 100C, and 100D. Applicable.

  In addition, for example, when one display unit 100A and the other display unit 100B overlap each other, the organic EL element 11 in the display region 110Aa in one display unit 100A is turned off or dimmed. In the same figure, the display area 110Aa on the back surface side of the display section 100A and the display area 110Ba on the back surface side of the display section 100B, that is, the display area 110Ba overlapping the display section 100A are similarly turned off or dimmed.

  Further, when the other display unit 100C partially overlaps with one display unit 100D, the organic EL element 11 in the region 110Db where the display is shielded in the one display unit 100D is turned off or dimmed.

  In consideration of the time lapse of the overlap between the display units 100A, 100B, 100C, and 100D, the organic EL element 11 to be saved is dimmed in the initial stage, and after a predetermined time (several tens of seconds) has elapsed. It is preferable to turn off the light.

  According to such a driving method of the display device 1000, efficient power saving can be achieved even if a plurality of display units 100A, 100B, 100C, and 100D are provided.

  Note that the configuration of the display device 1000 is not limited to this, and the main body 1100 may include a plurality of the display devices 200 according to the second embodiment. Then, the driving method of the display device 200 of the fourth embodiment and the fifth embodiment of the second embodiment may be applied to the display device 1000.

  The first to third embodiments that embody the present invention have been described with reference to the examples. By the way, as a method of returning the power-saving mode in which the lighting of the light emitting element or the light source is reduced or turned off to the normal lighting state (normal mode), for example, the sensor 13 is released from the contact state of the human body or the display shielding state. Detecting this, sending a normal lighting signal to the display control unit 131 and causing the display unit 130 to light normally, an operation of repeatedly touching a specific part of the display area 110a with a finger (such as a double click with a mouse) Operation), or a method of drawing a specific shape such as a circle by tracing the display area 110a with a finger, detecting these operations by the sensor 13, and releasing the power saving mode.

  Various modifications other than the above embodiment are conceivable. Hereinafter, a modification will be described.

  (Modification 1) In the first embodiment and the second embodiment, the sensor 13 (sensor 53) is not limited to being provided for each pixel 15 (pixel 55) on the element substrate 10 (element substrate 50) side. For example, the sensor 13 (sensor 53) may be arranged every plurality of pixels 15 (pixels 55).

  (Modification 2) In the first embodiment and the second embodiment, the sensor 13 (sensor 53) is not limited to being provided in the display panel 110 (display panel 150). FIG. 14 is a schematic cross-sectional view showing the structure of a display device according to a modification. For example, as shown in FIG. 14, the display device 300 according to the modification includes the touch panel 135 as a sensor between the sealing substrate 20 and the resin film 40 </ b> A in the display device 100 of the first embodiment. . As the touch panel 135, a resistance film method, a capacitance method, or the like can be employed. Thereby, when a human body etc. contact the display part 130 from the sealing substrate 20 side equipped with the touch panel 135 at least, the contact position can be detected. Based on the contact position detection result from the touch panel 135, the display control unit 131 may be configured to turn off or dimm the organic EL element 11 at the contact site. Although the thickness of the display unit 130 is increased by the touch panel 135, it is not necessary to incorporate the sensor 13 on the element substrate 10 side, so that the configuration of the display panel 110 can be simplified.

  (Modification 3) The configuration of the light-receiving display panel 150 in the second embodiment is not limited to this. For example, an FFS (Fringe Field Switching) type or IPS (In Place Switching) type liquid crystal panel that includes a pair of electrodes on one substrate side and drives a liquid crystal layer by a horizontal electric field generated between the electrodes may be used. Alternatively, the display device is not limited to an active display device having a switching element, and may be a passive liquid crystal panel.

  (Modification 4) In the first embodiment, the display device 100 is driven and controlled as having the R, G, and B pixels 15, but the color filter 21 on the sealing substrate 20 side is deleted, and the organic EL element 11 is replaced. For example, if white light is emitted, the display device 100 can be driven and controlled as a sheet-like lighting device, and power saving can be achieved.

  (Modification 5) In the first embodiment, the light emitting element in the self-luminous display unit 130 is not limited to the organic EL element 11. For example, a light emitting element such as a field emission element used in an LED (Light Emitting Diode), an FED (Field Emission Display), or an SED (Surface-conduction Electron-emitter Display) can be applied.

  (Modification 6) In the said Embodiment 3, the structure of display part 100A, 100B, 100C, 100D is not limited to what the two display apparatuses 100 of the said Embodiment 1 overlapped with the display surface outside. For example, a plurality of display devices 100 may be attached to the connection portion 1120 so that the display surface can be confirmed by turning the main body 1100 in a certain direction. Further, although the display device 100 has a top emission structure, the display can be confirmed from both surfaces of one display device 100 if light emission can be extracted also to the element substrate 10 side.

  DESCRIPTION OF SYMBOLS 13,53 ... Sensor, 15,55 ... Pixel, 100, 200, 300, 1000 ... Display device, 90 ... Illumination device, 91 ... Light source, 110 ... Display panel, 110a, 150a ... Display area, 111a, 111b, 151a, Reference numeral 151b: contact area, 112a, 112b, 152a: area obtained by dividing the display area, 130: self-luminous display section, 170 ... light receiving display section.

Claims (14)

A driving method of a display device including a sheet-like display unit having a display area provided with a plurality of pixels,
The display unit is self-luminous;
A sensor for detecting whether or not there is a contact with the display unit by a human body or the like, or whether or not the display in the pixel is in a shielding state with the contact of the human body or the like,
When it is determined that the contact is present or the display is shielded based on an output from the sensor during the driving of the display unit, at least the pixels at the contact part are turned off or dimmed. A driving method of a display device.   The display device driving method according to claim 1, wherein at least one of the pixels adjacent to the pixel at the contact portion is turned off or dimmed.   The display device driving method according to claim 1, wherein the display area is controlled to be divided into a plurality of areas, and the area including the pixel at the contact portion is turned off or dimmed.   4. The display device according to claim 1, wherein when it is determined that the contact has continued for a predetermined time, all of the display area including the pixel of the contact portion is turned off or dimmed. Method for driving the display device.   A plurality of the display units with one end bound, and when the other display unit overlaps one of the at least two display units, the one display unit overlaps the other display unit The display device driving method according to claim 1, wherein at least a part of the display area of the unit is turned off or dimmed.   6. The method for driving a display device according to claim 5, wherein the pixel of the one display portion in the portion where the other display portion overlaps is turned off or dimmed.   The entire display area of the one display section is turned off or dimmed when it is determined that the overlap of the other display section with the one display section has continued for a predetermined time. 7. A method for driving a display device according to 5 or 6. A driving method of a display device including a sheet-like display unit having a display area provided with a plurality of pixels,
The display unit is a light-receiving type, and is disposed immediately below the display unit, and includes a lighting device including a plurality of light sources that illuminate at least the display region;
A sensor for detecting whether or not there is a contact with the display unit by a human body or the like, or whether or not the display in the pixel is in a shielding state with the contact of the human body or the like,
When it is determined that the contact is present or the display is shielded based on an output from the sensor during driving of the display unit, at least the light source at the contact portion is turned off or dimmed. Display device driving method.   9. The method for driving a display device according to claim 8, wherein at least one of the light sources adjacent to the light source at the contact portion is turned off or dimmed. The illumination device is controlled to divide the display area into a plurality of areas and illuminate, and has at least one light source for each area,
The method of driving a display device according to claim 8, wherein the light source provided in the region including the contact part is turned off or dimmed.   A plurality of the display units with one end bound, and when the other display unit overlaps one of the at least two display units, the one display unit overlaps the other display unit The display device driving method according to claim 8, wherein at least one of the light sources of the illuminating device is turned off or dimmed.   The method for driving a display device according to claim 11, wherein the light source is turned off or dimmed in a portion where the other display portion of the illumination device of the one display portion overlaps.   When it is determined that the overlap of the other display unit with the one display unit has continued for a predetermined time, all the light sources in the illumination device of the one display unit are turned off or dimmed. The method for driving a display device according to any one of claims 8 to 12.   14. The display device driving method according to claim 1, wherein the sensor uses at least one of light detection, pressure detection, and capacitance detection. 15.

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