JP2005031210A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for attaining larger screen and higher definition. <P>SOLUTION: The display device is provided with pixels P, P1, Pl for display, light sources LS, LS', LS1, LS2, LS3, LS4 that emit light rays R0, R1, R2 and movable reflection parts M, M', M1, M2, M3, M4 that reflect the light rays, illuminate the pixels and control the display of the pixels. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device, and more particularly to a display device capable of displaying a high-definition image.
[0002]
[Prior art]
In recent years, the necessity of displaying high-quality images has increased due to the spread of high-definition broadcasting, for example, and a display device capable of displaying a large screen with high definition is required. Therefore, there is an urgent need to develop a display device capable of increasing the screen size and resolution.
[0003]
For example, as one of display devices currently used, there is a plasma display panel (hereinafter referred to as PDP). PDP has features such as easy screen enlargement, good display quality, and wide viewing angle compared to liquid crystal display, and can be thinned, so it can be made large, such as a wall-mounted display. It has come to be used as a display device.
[0004]
An outline of the operation principle of the PDP is an ultraviolet ray generated by optical transition caused by exciting particles (atoms) of a rare gas by causing a discharge in a discharge space filled with a gas filled with a rare gas, for example, called a display cell. The phosphor is excited by the above, and the visible light from the phosphor is used for display light emission.
[0005]
FIG. 1 is a cross-sectional perspective view schematically showing a part of the structure of a PDP 100, which is an example of a conventional alternating current (AC) drive type PDP.
[0006]
Referring to FIG. 1, in the PDP 100, a front plate 107 made of a glass substrate and a back plate 101 are arranged to face each other with a discharge space 106 in between. A display electrode 108 is arranged on the front plate 107 on the side facing the back plate 101, the display electrode 108 is covered with a dielectric film 109, and the dielectric film 109 is further a protective film 110. The structure is covered with. The display electrode 108 is configured by arranging a pair of band-shaped scan electrodes 108SC and sustain electrodes 108SU in parallel with each other.
[0007]
On the other hand, a plurality of strip-like data electrodes 102 orthogonal to the display electrodes 108 are provided on the back plate 101 on the side facing the front plate 107, and the plurality of data electrodes 102 are parallel to each other. The data electrodes 102 are arranged and covered with a dielectric film 103.
[0008]
Further, a partition wall 104 is provided on the dielectric film 103 to separate the plurality of data electrodes 102 and form a discharge space 106 to separate pixels (display cells). A phosphor film 105 is formed from the dielectric film 103 on the data electrode 102 to the side surface of the partition wall 104. The PDP 100 shown in FIG. 3 has a structure in which, for example, red, green, and blue phosphor films 105 are sequentially arranged with the partition wall 104 interposed therebetween in order to enable color display.
[0009]
The discharge space 106 is filled with a filling gas made of an inert gas, and the filling gas is made of a mixed gas of, for example, at least one of He, Ne, and Ar and Xe.
[0010]
In the PDP 100 having such a structure, the dielectric films 103 and 109 are provided for accumulating charges generated by discharge.
[0011]
In addition, the number of display cells is arbitrary, and actually, a PDP which is a large display device is formed by combining a large number of display cells.
[0012]
In the PDP such as the PDP 100, image display is performed by repeatedly performing one unit of display operation called a field. One field is composed of a plurality of subfields, and the subfield is composed of a reset period, an address period, and a sustain period.
[0013]
That is, a subfield consisting of a reset period, an address period, and a sustain period is repeated to form one field that is an operation unit of image display.
[0014]
For example, taking the PDP 100 as an example, the operation in the subfield is generally as follows.
[0015]
First, in the reset period, reset discharge is performed to make the wall charges (charges accumulated in the dielectric film 109) the same state, and in the address period, the scan electrode 108SC and the data electrode 102 are then reset. In the sustain period, the sustain discharge is performed between the scan electrode 108SC and the sustain electrode 108SU.
[0016]
Details of the operation in the PDP subfield will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 schematically shows a plan view of the PDP 100. In the figure, n scan electrodes 108SC (n is a natural number) are formed, and the scan electrodes 108SC are designated as SCN (1 , 2, 3, ... n). Similarly, n sustain electrodes 108SU are formed (n is a natural number), and the data electrodes 108SU are represented by SUS (1, 2, 3,... N).
[0017]
Further, m data electrodes 102 (m is a natural number) are formed, and the data electrodes 102 are represented by DATA (1, 2, 3,... M).
[0018]
FIG. 3 is a time chart showing voltages applied to the data electrode 102, the scan electrode 108SC, and the sustain electrode 108SU. Also in this figure, the notation of the code | symbol similar to FIG. 2 is used. In FIG. 3, the display of the operation during the reset period is omitted.
[0019]
2 and 3, first, in the reset period, for example, reset discharge of the display electrode 108 (scan electrode 108SC and sustain electrode 108SU) is performed in the discharge space 106 of all the display cells, and wall charges are generated. The state of (charge accumulated in the dielectric film 109) is made the same.
[0020]
Next, in the address period, the SCN (1, 2, 3,. _SCN In this case, a voltage V is applied to any data electrode of the DATA (1, 2, 3,... M). _WRI Is applied, so-called line sequential scanning is performed so that address discharge occurs only in the discharge space 106 of an arbitrary display cell. The wall charges are formed only in the display cells that have undergone this address discharge, and discharge occurs in the next sustain period.
[0021]
Next, in the sustain period, the SCN (1, 2, 3,... N) and the SUS (1, 2, 3,. _SCN And V _SUS Is applied to perform a sustain discharge in the discharge space 106. At this time, the sustain discharge occurs only in the display cell in which the wall charges are formed, that is, the cell in which the address discharge is performed in the address period. Further, it is possible to display an image by controlling the gradation of image display according to the number of sustain discharges.
[0022]
[Non-Patent Document 1]
NHK R & D, No. 74, p42-47 (2002)
[0023]
[Non-Patent Document 2]
Electronic Journal separate volume, 2000 FPD Technology Taizen, p398
[0024]
[Problems to be solved by the invention]
However, in the case of a display device that requires so-called line-sequential scanning, such as the PDP 100, for example, there is a limit on the number of scanning lines because the scanning speed is limited, and the display device is increased in size and resolution. There was a problem that became difficult.
[0025]
FIG. 4 shows an example of the time occupation ratio and configuration of the field. Referring to FIG. 4, one field includes eight subfields (1SF to 8SF), and each subfield includes a reset period, an address period, and a sustain period. By changing the number of sustain discharges in the sustain period in each subfield, for example, 256 gradation display can be performed using data corresponding to weighting of 8-bit data.
[0026]
For example, when the number of scanning lines is increased due to an increase in the size or definition of the display device, it is not necessary to change the length of the reset period and the sustain period in FIG. 4, but in the description of FIGS. As described above, since it is necessary to scan the increased number of scanning lines sequentially, the address period becomes long.
[0027]
For example, in the case shown in FIG. 4, if the field frequency is 59.94 MHz, which is currently used, the period of one field is 16.68 ms. That is, one field of operation must be completed in 16.68 ms. In this case, for example, assuming that the number of gradations is 256, the sustain pulse period is 12 μs, and the response time is 1 μs, the number of scanning lines is limited to about 1700, and it is difficult to further increase the screen size and resolution.
[0028]
Accordingly, an object of the present invention is to provide a new and useful display device that solves the above-described problems.
[0029]
A specific problem of the present invention is to provide a display device that can have a large screen and high definition.
[0030]
[Means for Solving the Problems]
According to the present invention, there is provided a display comprising: a display pixel; a light source that emits light; and a movable reflector that reflects the light and irradiates the pixel to control display of the pixel. Solve by using the device.
[0031]
According to the present invention, the display of the pixel is controlled by moving the movable reflecting portion that reflects the light emitted from the light source, thereby controlling the state of irradiating the pixel with the light and the state of not irradiating the pixel. For this reason, control of image display becomes high speed, and the number of controllable pixels can be increased. Therefore, the number of pixels for displaying an image can be increased, and the display device can be increased in size and definition.
[0032]
Further, if the movable reflecting portion has a plurality of reflecting mirrors and a control means for controlling the reflection angle of the light beam of the reflecting mirror, it is possible to control display of the plurality of pixels at high speed, which is preferable. is there.
[0033]
The pixel includes a first substrate, a second substrate facing the first substrate, and a first electrode formed on a side of the first substrate facing the second substrate. A second electrode formed on a side of the second substrate facing the first substrate and a discharge space formed between the first and second electrodes may be provided. It is preferable that the discharge in the discharge space is controlled by the light beam reflected by the reflecting portion, so that it is possible to control the image display of the pixel by the discharge.
[0034]
In addition, it is preferable that the discharge effect can be performed by the light beam when the discharge is controlled in the discharge space by the photoelectric effect by the irradiation of the light beam.
[0035]
In addition, when the second electrode is covered with a protective film, and the discharge of the discharge space is controlled by the photoelectric effect generated when the light beam is applied to the protective film, the photoelectric effect is removed from the protective film. This is preferable because of the emission of electrons.
[0036]
In addition, it is preferable to provide a plurality of the movable reflecting portions because it is possible to increase the number of pixels that can be controlled.
[0037]
In addition, it is preferable to provide a plurality of the light sources because it is possible to increase the number of pixels that can be controlled.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 5 is a cross-sectional perspective view schematically showing a part of the structure of an alternating current (AC) drive type PDP 10 as an example of the display device according to the present invention.
[0039]
Referring to FIG. 5, in the PDP 10, a front plate 17 made of a glass substrate and a back plate 11 are arranged to face each other with a discharge space 16 interposed therebetween. A display electrode 18 is disposed on the front plate 17 on the side facing the back plate 11, the display electrode 18 is covered with a dielectric film 19, and the dielectric film 19 is further protected by a protective film 20. The structure is covered with. The display electrode 18 is configured by a pair of strip-shaped scan electrodes 18SC and sustain electrodes 18SU arranged in parallel to each other.
[0040]
The scanning electrode 18SC is formed of a material that is transparent to visible light, such as tin oxide or ITO. The sustain electrode 18SU is formed of a low resistance material such as silver, copper, or aluminum.
[0041]
On the other hand, a plurality of strip-shaped data electrodes 12 orthogonal to the display electrodes 18 are provided on the back plate 11 on the side facing the front plate 17. The data electrode 12 is preferably formed of a transparent metal material such as ITO. The data electrode 12 may be formed using a material such as silver, copper, or aluminum.
[0042]
The plurality of data electrodes 12 are arranged in parallel to each other, and each of the data electrodes 12 is covered with a dielectric film 13.
[0043]
Further, a partition wall 14 for separating the plurality of data electrodes 12 and forming a discharge space 16 to form a pixel (display cell) P is provided on the dielectric film 13. Further, a phosphor film 15 is formed from the dielectric film 13 on the data electrode 12 to the side surface of the partition wall 14. The PDP 10 shown in FIG. 5 has a structure in which, for example, red, green, and blue phosphor films 15 are sequentially arranged with the partition wall 14 interposed therebetween in order to enable color display.
[0044]
The discharge space 16 is filled with a filling gas made of an inert gas, and thus a panel body 10A made up of a plurality of pixels is formed.
[0045]
The sealed gas is a mixed gas of at least one of He, Ne, and Ar and Xe, for example.
[0046]
In the PDP 10 having such a structure, the dielectric films 13 and 19 are provided for accumulating charges generated by applying a voltage to the data electrode 12 and the display electrode 18. For example, the dielectric layers 13 and 19 are made of a low melting point glass material.
[0047]
In addition, the number of display cells (pixels) is arbitrary, and in actuality, a PDP that is a large display device is formed by combining a large number of display cells.
[0048]
The outline of the operation of the PDP 10 is as follows. First, in the reset period, reset discharge is performed to make the wall charges (charges accumulated in the dielectric film 19) the same, and then in the address period. The address discharge between the scan electrode 18SC and the data electrode 12 is performed, and then, in the sustain period, the sustain discharge is performed between the scan electrode 18SC and the sustain electrode 18SU.
[0049]
In the PDP 10 shown in the present embodiment, a light source LS is provided, and a pixel is irradiated with a light beam R1 emitted from the light source LS, for example, from the back substrate 11 side to control the discharge state of the discharge space. .
[0050]
An enlarged cross-sectional view of the pixel P is shown in FIG. 6A, and an AA cross-sectional view of FIG. 6A is shown in FIG. However, in the figure, the same reference numerals are given to the parts described above, and the description will be omitted.
[0051]
Referring to FIGS. 6A and 6B, the light ray R1 is applied to the pixel P from, for example, the side of the back substrate 11 opposite to the side facing the discharge space 16. The light ray R 1 passes through the back substrate 11 and the data electrode 12 and enters the protective film 20.
[0052]
In addition, when the data electrode 12 is made of a material that cannot transmit the light ray R1 such as silver, copper, or aluminum, the light ray R1 is incident on the protective film 20 from between the data electrode 12 and the side wall 14.
[0053]
Therefore, for example, when the protective film 20 made of MgO is irradiated with photons having energy of about 3 to 4 eV, that is, light rays having a wavelength of about 310 nm or less, photoelectrons are generated by the photoelectric effect and emitted into the discharge space. Is done.
[0054]
The discharge in the discharge space 16 can be controlled by controlling the emission of such photoelectrons by the irradiation of the light beam and the stop of the irradiation. In other words, it is possible to control the discharge of the discharge space 16 by irradiating the pixel P with the light ray R1 or stopping the irradiation, and to control the display state of the pixel.
[0055]
In addition, it is necessary to use, for example, an excimer laser or the like whose light wavelength is shorter than the photoelectron emission limit wavelength of the protective film 20, such as XeCl (wavelength 308 nm) or KrF (wavelength 248 nm). Is possible.
[0056]
Next, details of the operation of the PDP 10 will be described with reference to FIGS. FIG. 7 schematically shows a plan view of the PDP 10. In the figure, it is assumed that p scanning electrodes 18SC are formed (p is a natural number), and the scanning electrodes 18SC are defined as SCN (1 , 2, 3, ... p). Similarly, p sustain electrodes 18SU (p is a natural number) are formed, and the data electrodes 18SU are represented by SUS (1, 2, 3,... P).
[0057]
Further, q data electrodes 12 (q is a natural number) are formed, and the data electrodes 12 are represented by DATA (1, 2, 3,... Q). In addition, p × q light sources LS are provided, which are indicated by light sources LS (i, J (i = 1 to p, J = 1 to q)) in the drawing.
[0058]
FIG. 8 is a time chart showing voltages applied to the data electrode 12, the scan electrode 18SC, and the sustain electrode 18SU. In this figure, the same reference numerals as those in FIG. 7 are used. In FIG. 7, the display of the operation during the reset period is omitted.
[0059]
7 and 8, first, in the reset period, for example, the reset discharge of the display electrode 18 (scan electrode 18SC and sustain electrode 18SU) is performed in the discharge space 16 of all the display cells, and the wall The state of charge (charge accumulated in the dielectric film 19) is made the same.
[0060]
Next, in the address period, among the SCNs (1, 2, 3,... P), those related to the case where discharge is performed in the address period, the pulse voltage V as in the normal PDP. _SCAN give. On the other hand, the DATA (1, 2, 3,... Q) has a voltage V _bias Apply.
[0061]
However, in this case, the potential difference between SCN and DATA | V _SCAN -V _bias | Is set to be equal to or lower than the discharge start voltage in the discharge space. Accordingly, the SCN pulse potential V V _SCAN Accordingly, the pixel is irradiated with the light beam R1 from the light source LSLS (i, J (i = 1 to p, J = 1 to q)).
[0062]
Here, the discharge discharge voltage of the discharge space is lowered by the electrons emitted from the protective film 20, and address discharge occurs. As a result, address discharge can be simultaneously generated in a plurality of arbitrary pixels. That is, when a voltage is applied to DATA and SCN so that a discharge is likely to occur, the light ray R1 is irradiated to cause a discharge in a discharge space of an arbitrary pixel, thereby controlling the display state of the pixel.
[0063]
Next, in the sustain period, the SCN (1, 2, 3,... P) and the SUS (1, 2, 3,... P) are pulsed like the normal PDP. A voltage is applied to and a sustain discharge is performed in the discharge space. At this time, the sustain discharge occurs only in the cell in which the wall charge is formed, that is, the cell in which the address discharge is performed in the address period. Further, it is possible to display an image by controlling the gradation of image display according to the number of sustain discharges.
[0064]
Each voltage applied in the PDP 10 according to the present embodiment varies depending on the conditions of the PDP members. For example, in a PDP cell having an address gap length of 150 nm, Ne—Xe (5%) is used as the sealing gas, and 500 Torr (66. Under the pressure condition of 5 kPa), the discharge start voltage when the light beam R1 is not irradiated is about 200 to 500 V. For example, by irradiating the light beam R1 made of an excimer laser with an output of 5 mW, the discharge start voltage is 10 It is possible to reduce by about 20V.
[0065]
In the display device as shown in the PDP 10, it is not necessary to perform so-called line-sequential scanning, which is necessary in the conventional display device, and in the address period, discharge in the discharge space of each pixel is performed in parallel processing. Things are possible. For example, it is not necessary to sequentially apply a voltage to the scan electrode, and switching between the irradiation (ON) or non-irradiation (OFF) state of the light beam R1 by the light source LS with the voltage applied to the desired scan electrode. Each pixel can be controlled by parallel processing.
[0066]
Therefore, the number of scan electrodes is not limited, and for example, the number of scan electrodes and sustain electrodes can be increased to increase the screen size and the definition of the display device. Further, since the address period can be shortened, it is possible to improve the image quality by increasing the number of subfields, and to improve the luminance by increasing the number of sustain discharges.
[0067]
Further, in the display device as shown in the PDP 10, for example, an example in which image display is controlled using i × j light sources has been shown, but the method for controlling image display by light rays is limited to this. is not. For example, it is possible to control the image display of the display device by irradiating the image with the light beam emitted from the light source reflected by the reflection unit. In this case, the number of the light sources to be used is reduced, This has the effect of simplifying the configuration and can reduce the manufacturing cost of the display device.
[0068]
Next, an example of the configuration of such a light source and a reflection unit will be described.
[Second Embodiment]
FIG. 9 shows an image display control mechanism of the display device, for example, an image display control mechanism of the PDP 10, which includes the light source LS and the reflection part M that reflects the light ray R 0 emitted from the light source LS.
[0069]
Referring to FIG. 9, the light source LS includes a light emitting source LS0 that emits a light ray R0 and a lens LN that collects the light ray R0. A light beam R0 emitted from the light beam emission source LS0 and collected by the lens LN is reflected by the reflecting portion M and applied to the pixels of the panel body 10A.
[0070]
The reflection unit M has a control mechanism for controlling the angle at which the light ray R0 is reflected. The reflection unit M reflects the light ray R0 and irradiates the pixel of the PDP 10 with the light ray R1, and irradiates the pixel with the light ray. Without being switched, the state of irradiating the light beam R2 to the part other than the pixels is switched and controlled. In this case, a change range of the irradiation angle of the light ray R0 controlled by the reflection unit M is defined as an operating angle θ. Next, the detail of such a reflection part M is demonstrated using FIG. 10 (A), (B).
[0071]
FIG. 10A is a partially enlarged view of a perspective view of the reflective portion M. The reflective portion M is provided with a plurality of fine reflective mirrors m provided on the substrate W on the substrate W. The control mechanism is configured to control the movable state by a control mechanism (not shown). For example, 800 × 600 or 1024 × 768 reflection mirrors are arranged on the substrate with a pitch Pi of 17 μm.
[0072]
The reflection part having such a structure may be referred to as DMD (registered trademark, digital micromirror device).
[0073]
The reflection mirror m has a structure in which the operation is controlled by a CMOS SRAM (not shown) formed on the substrate W and can be operated at high speed.
[0074]
FIG. 10B schematically shows a BB cross-sectional view of the reflection mirror m on the substrate W. Referring to FIG. 10B, the reflection mirror m is fixed to a holding portion W3 called a yoke, for example, and the fixing portion W3 is held in a movable state by a hinge mechanism W2.
[0075]
Corresponding to SRAM data (not shown) formed on the substrate W, the reflecting mirror m is tilted with respect to the substrate W by electrostatic attraction acting on the electrode W1 and the holding portion W3, for example. It is possible to control.
[0076]
For example, the mirror m can be controlled to be inclined by θ / 2 that is half of the operating angle θ with respect to the substrate W, or can be controlled to be inclined by θ / 2 in the opposite direction. As shown in FIG. 9, it is possible to control the state in which the light ray R0 is reflected to be a light ray R1, and the light ray R2 has a reflection angle changed from the light ray R1 by the operating angle θ. It has become.
[0077]
As described above, the light emitted from the light source LS is reflected by the plurality of reflecting mirrors and irradiated to the plurality of pixels substantially simultaneously, thereby enabling the display control of the plurality of pixels to be performed substantially simultaneously, that is, by parallel processing. . Therefore, even when the number of pixels to be controlled is increased, it is possible to control display of pixels by parallel processing without increasing the number of light sources.
[0078]
In addition, when using a reflection unit having a plurality of reflection mirrors as described above, the same processing as in the case of using one light source can be performed on one pixel, and the same effect can be obtained. . In this case, the processing for image display, that is, the configuration of the subfields may be the same as in FIG. 8, and for example, as shown in FIG. 8, the data electrode 12, the scan electrode 18SC, and the sustain electrode 18SU. A voltage may be applied to.
[0079]
In addition, since the number of light sources can be reduced with respect to the number of pixels by providing the reflecting portion provided with a plurality of reflecting mirrors, the configuration of the display device can be simplified. The manufacturing cost can be kept low.
[0080]
Next, an example of a method for controlling display of pixels by irradiating the panel main body 10A with light using the light source LS and the reflection portion M is shown in FIGS.
[Third embodiment]
FIGS. 11A to 11C show examples of installation methods when the light source LS and the reflection part M are installed in the panel main body 10A shown in FIG. However, in the figure, the same reference numerals are given to the parts described above, and the description will be omitted. 11A to 11C, the direction parallel to the data electrode 12 of the panel body 10A is defined as the height direction, and the length in the height direction of the panel body 10A is defined as the height H. .
[0081]
Further, as shown in FIGS. 6A and 6B, the light source LS and the reflection portion M are arranged with respect to the panel main body 10 </ b> A so that the side irradiated with the light ray R <b> 1 is the back substrate 11 side. It is installed. Moreover, the said reflection part M shall be installed on the surface 10B parallel to the said panel main body 10A, and let the thickness D be the distance of the said panel main body 10A and the said surface 10B. In this case, the thickness D is a value corresponding to the thickness of the display device including the panel body 10A.
[0082]
First, referring to FIG. 11A, for example, the light source LS is installed at an end in the height H direction of the panel body 10A, and the reflecting portion M is substantially opposed to the light source LS on the surface 10B. The reflection part M is provided so that the light ray R0 is reflected by the reflection part M when the light ray R0 is irradiated from the light source LS substantially perpendicular to the surface 10B.
[0083]
For example, when irradiating the pixel P1 shown in the drawing with a light beam, the angle of the reflection mirror m is controlled, and the light beam R1 reflected by the mirror m is irradiated to the pixel P1.
[0084]
On the other hand, when the pixel P1 is not irradiated with the light beam, the angle of the mirror m is set so that the light beam R2 is irradiated to the end Ed of the panel body 10A opposite to the side where the LS is provided. Be controlled.
[0085]
In addition, the position where the reflecting portion M is installed is not limited to the case of FIG. 11A, and can be used with various changes, for example, FIG. 11B or FIG. 11C. It is possible to change as shown in FIG. However, in the figure, the same reference numerals are given to the parts described above, and the description will be omitted.
[0086]
In the case shown in FIG. 11 (B), the reflective portion M is installed on the side closer to the end portion Ed in the surface 10B than in the case of FIG. 11 (A).
[0087]
Further, in the case shown in FIG. 11C, the reflective portion M is installed in a direction away from the end portion Ed in the surface 10B, as compared with the case of FIG. In particular, in the case of FIG. 11C, there is an effect that the range of pixels that can be irradiated with light rays increases as the reflecting portion M is moved away from the end portion Ed.
[0088]
Thus, the installation location of the reflection unit can be variously changed, and in any of FIGS. 11A to 11C, the number of light sources can be reduced with respect to the number of pixels. Therefore, the configuration of the display device can be simplified, and the manufacturing cost of the display device can be kept low.
[0089]
As described above, when the light source LS and the reflection unit M are used to irradiate the pixel with the light beam, the light beam is radiated according to the operating angle θ of the mirror of the reflection unit M, that is, the maximum shake of the mirror m. The range in which irradiation is possible, that is, the display control of the image can be determined.
[0090]
For example, in the case shown in FIG. 11 (A), if the maximum value of the angle fluctuation of the mirror m is the operating angle θ, the range in which the light source LS and the reflection unit M can irradiate the pixels is the end. The range is from the portion Ed to the point indicated by the pixel P1. In this case, the range of the height that can irradiate the pixel with the light beam is 0 point with respect to the end portion Ed, and the height from the end portion Ed to the pixel P1 is t. It becomes.
[0091]
As described above, in the pixels of the panel body, the display controllable range, that is, the range in which the light can be irradiated depends on the operating angle θ, and the light can be irradiated as the operating angle θ increases. The range becomes larger.
[0092]
Similarly, the display controllable range, that is, the range in which light irradiation is possible depends on the thickness D, and the larger the thickness D, the larger the range in which light irradiation is possible.
[0093]
Therefore, taking the case of FIG. 11 (A) as an example, the results of examining the required thickness D and the required operating angle θ by simulation when irradiating the image P1 of the panel main body 10A with simulation are shown in FIG. Shown in
[0094]
Examination by simulation is conducted for each case where the height t0 (t / H), which is a value obtained by normalizing the height t of the image P1 to be irradiated with the light beam by the height H, is changed.
[0095]
FIG. 12 shows a case where the height t0 of P1 is set to 1.0, 0.8, 0.6, 0.5, 0 in the case shown in FIG. .4 and 0.2, the results calculated as series t10, t8, t6, t5, t4 and t2 are shown in the figure. The horizontal axis represents the thickness D0 (D / H), which is a value obtained by standardizing the thickness D by the height H, and the vertical axis represents the required operating angle θ.
[0096]
In this case, when the pixel P1 is not irradiated with a light beam, the angle of the mirror m of the reflection unit M is controlled so that the light beam is applied to the end portion Ed of the panel body 10A. ing.
[0097]
Referring to FIG. 12, in the case of series t10 having a height t0 of 1.0, that is, an attempt is made to irradiate light to the pixel P1 at the end of the panel body 10A on the side where the light source LS is installed. Taking the case as an example, for example, when the D0 (D / H) is 2.0, that is, when the thickness D is twice the height H, the operating angle θ is 25 °. That should be the above.
[0098]
For example, in the case of the reflection part M currently used generally, that is, DMD (registered trademark), since the operation angle θ is about 20 °, it is difficult to irradiate the pixel P1 with the light beam under this condition. . Further, in this case, there is a problem that the thickness D is increased and the thickness of the display device is increased.
[0099]
Therefore, if the height t0 is reduced, the required operating angle θ can be reduced, and the required thickness D can be reduced.
[0100]
For example, in FIG. 12, when t0 is 0.6, the required operating angle θ can be set to approximately 20 ° by setting D0 to 1.4. Thus, by reducing t0, the required thickness D can be reduced, and the required operating angle θ can be reduced. Further, when t0 is reduced, the thickness D of the display device can be reduced by further reducing the thickness D while keeping the required operating angle θ within 20 °. For example, when t0 is set to 0.5, it is possible to reduce the required D0 to 0.1 or less while reducing the required operating angle to 20 ° or less. It can be made thinner.
[0101]
However, keeping the value of t0 small means that the range in which the light beam can be irradiated is reduced. For example, the range of the height t0 in which the light beam can be irradiated is 0 ≦ t0 ≦ 0. In the case of 0.5, it becomes impossible to irradiate the pixels with light in the range of 0.5 <t0 ≦ 1.0.
[0102]
In order to solve such a problem, as shown in FIG. 12, for example, a plurality of light sources LS and reflection parts M may be provided.
[0103]
FIG. 13 shows an example in which a plurality of light sources and reflection parts are provided on the panel body 10A. However, in the figure, the same reference numerals are given to the parts described above, and the description will be omitted. In the case shown in this figure, in addition to the light source LS and the reflection part M, a light source LS ′ and a reflection part M ′ are provided.
[0104]
Referring to FIG. 12, in the case shown in the figure, a light source LS ′ is provided at an end Ed of the panel main body 10A facing the end of the panel main body 10A provided with the light source LS. Further, a reflective portion M ′ is provided at a position on the surface 10B substantially opposite to the LS ′.
[0105]
In this case, the light source LS and the reflection part M irradiate light to the pixels of the A1 part that is approximately half of the panel main body 10A, that is, 0 ≦ t0 ≦ 0.5, and the light source LS ′. The reflection part M ′ irradiates light to the pixels of the A2 part that is approximately half of the panel main body 10A, that is, 0.5 <t0 ≦ 1.0.
[0106]
For this reason, it becomes possible to irradiate light to all the pixels of the panel main body 10A while setting the operating angle θ of the light source LS and the light source LS ′ to 20 ° or less, and reducing the thickness D to display the display device. Can be made thinner.
[0107]
In this way, by using a plurality of light sources and reflecting portions, the required operating angle θ of the reflecting portions is suppressed, and the required thickness D is reduced, thereby reducing the thickness of the display device. It becomes possible to do.
[Fourth embodiment]
Next, as an example in which a plurality of light sources and reflection units are provided in the display device, for example, an example of a display device in which four light sources and four reflection units are provided in the panel body 10A is shown in FIG.
[0108]
FIG. 14 is a perspective view schematically showing an example of the PDP 20 in which four light sources and four reflecting portions are installed on the panel main body 10A. However, in the figure, the same reference numerals are given to the parts described above, and the description will be omitted.
[0109]
In the case shown in the figure, the direction parallel to the display electrodes of the panel body 10A is the x-axis direction, the direction parallel to the data electrodes is the y-axis direction, and the direction orthogonal to the x-axis direction and the y-axis direction. Is the z-axis direction.
[0110]
Referring to FIG. 14, the panel body 10A has a flat and substantially rectangular parallelepiped shape, and light sources LS1, LS2, LS3, and LS4 are installed near corners of the substantially rectangular parallelepiped shape. In addition, reflecting portions M1, M2, M3, and M4 corresponding to the light sources LS1, LS2, LS3, and LS4 are installed, for example, light rays emitted from LS1 are reflected by the reflecting portion M1, and the panel body 10A The pixels are irradiated from the back substrate 11 side.
[0111]
In the present embodiment, a combination of a single light source and a reflection unit irradiates light to one range of, for example, a plurality of pixels of the panel main body 10A divided into approximately four.
[0112]
For example, if the length of the panel body 10A in the x-axis direction is the width Wi, and similarly the length in the y-axis direction is the height Hi, the width Wi is divided into two equal parts, and the height Hi is divided into two equal parts. In this way, when the panel body 10A is divided into four parts, and the areas a1, a2, a3, and a4 are respectively shown in the drawing, the area a1 can be divided into areas by, for example, a combination of the light source LS1 and the reflecting portion M1. The display of the pixel is controlled by irradiating the pixel a1 with light.
[0113]
In this case, for example, the region a1 may be on the side facing the light source LS1 on the diagonal line of the panel body 10A from the side where the light source LS1 is installed. Further, in this case, when controlling the pixel not to irradiate the light beam, the light beam reflected by the reflection portion M1 is on the diagonal line of the panel main body 10A from the corner portion of the panel main body 10A where the light source LS1 is installed. The mirror m of the reflection part M1 is controlled so that the opposite corner | angular part is irradiated.
[0114]
Similarly, the region a2 is, for example, from the side where the light source LS2 is installed to the side facing the light source LS2 on the diagonal of the panel body 10A, and the region a3 is, for example, installed with the light source LS3. The region a4 is on the diagonal line of the panel body 10A from the side where the light source LS4 is installed, for example, on the side facing the light source LS3 on the diagonal line of the panel body 10A. It is preferable to be on the side facing the light source LS4.
[0115]
Thus, by taking the positional relationship between the light source and the reflection part and the pixel whose display is controlled, for example, the thickness D ′, which is the distance between the panel body 10A and the reflection part, is reduced, and the display device It becomes possible to reduce the thickness. In addition, the required operating angle of the reflecting portion can be kept small.
[0116]
According to this embodiment, for example, it is possible to realize a display device in which the width Wi is 443 cm, the height Hi is 250 cm, the length of the diagonal H ′ is 508 cm (200 type), and the thickness D ′ is 50 cm. Is possible.
[0117]
Moreover, the installation method of a light source and a reflection part is not limited to this, It is possible to change and use the installation number and installation position of a light source, and the installation number and installation position of a reflection part. Further, the region to be irradiated with the light beam can be arbitrarily set and used.
[0118]
For example, a plurality of reflection units may be used for one light source. This is effective when the number of reflecting mirrors m in one reflecting portion is smaller than the number of pixels for controlling display. In addition, for example, a method of controlling display of pixels by directly irradiating pixels with light rays emitted from a light source, and a method of displaying a plurality of pixels by reflecting light rays emitted from one light source by a reflection unit having a plurality of reflection mirrors. It is also possible to use a method for controlling the above in the panel body.
[0119]
As described above, the number of light sources and reflection parts, the installation location, and the region for controlling the pixels can be changed and used in various ways.
[Fifth embodiment]
Although the embodiments have been described mainly with respect to the alternating current (AC) drive type PDP, the present invention is not limited to this. For example, taking the PDP as an example, the present invention can be applied to the DC drive type PDP and the AC / DC hybrid drive type PDP in the same manner, and has the same effect as described for the AC drive type PDP.
[0120]
For example, when the DC drive type PDP is taken as an example, the DC drive type PDP has the dielectric films 13 and 19 formed so as to cover the electrodes as shown in FIGS. 6A and 6B. For this reason, the protective film 20 is omitted.
[0121]
However, even in the case of the DC drive type PDP, as shown in FIGS. 6A and 6B, the photoelectric effect is obtained by irradiating the light beam R1 onto an electrode made of metal, for example. Occurs, electrons are emitted into the discharge space, and the discharge voltage in the discharge space decreases.
[0122]
For this reason, in the DC drive type PDP, as in the case of the AC drive type PDP, the discharge state of the discharge space can be controlled by the light beam.
[0123]
The present invention can also be used for display devices other than PDPs, and image display can be controlled by irradiation with light rays. Therefore, it is not necessary to perform so-called line-sequential scanning, which is necessary for conventional display devices, in other display devices, and there is no limit on the number of scanning lines. Is possible.
[0124]
In addition, by providing a reflection unit having a plurality of reflection mirrors that reflect the light rays emitted from the light source, the light rays emitted from one light source are reflected by the plurality of reflection mirrors and irradiated to a plurality of pixels substantially simultaneously. It is possible to control the display of the pixels by parallel processing. Therefore, even when the number of pixels is increased, it is possible to perform pixel processing without increasing the number of light sources. For this reason, there exists an effect which simplifies the wiring and control mechanism of a display apparatus.
[0125]
For example, FIGS. 15 to 16 show examples in which the present invention is applied to a display device using LEDs (light emitting diodes).
[0126]
FIG. 15 is an equivalent circuit diagram of the display device 30 using light emitting diodes.
[0127]
Referring to FIG. 15, a pixel Pl in which a light emitting unit 35 made of, for example, a light emitting diode and a light receiving unit 34 made of, for example, a phototransistor are connected in series has a power source voltage Vl (not shown) and a ground potential. A plurality of ground electrodes GND are connected. The number of pixels is arbitrary, and an arbitrary number of pixels Pl are connected to constitute a display device.
[0128]
FIG. 16 is a cross-sectional view schematically showing the structure of the pixel Pl.
[0129]
Referring to FIG. 16, for example, the pixel Pl is separated by a partition wall 32 formed on the substrate 31, and the light emitting unit 35 is further mounted on the light receiving unit 34 connected to the electrode 33 on the substrate 31. It is a structure that is placed and connected. The light emitting unit 35 is connected to the substrate 31 by a connection line 36. Further, the light emitting unit 35 is covered with a lens 37.
[0130]
The substrate 31 is provided with an opening 31a. As in the case of the PDP described in the embodiments, the light R1 emitted from the light source is received, and the light R1 from the opening 31a is received from the opening 31a. Irradiate the unit 34.
[0131]
By irradiating the light ray R1, the phototransistor of the light receiving unit 34 can be controlled, and the light emitting state of the light emitting element unit 35 can be controlled. In this case, it is possible to obtain the same effect as in the case of controlling the PDP described in the embodiment.
[0132]
Similarly, the present invention can be applied to a display device using organic EL, a display device (LCD) using liquid crystal, an FED (field emission display), and the like. There is an effect.
[0133]
Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the specific embodiments described above, and various modifications and changes can be made within the scope described in the claims.
[0134]
【The invention's effect】
In the present invention, a display device having a structure for controlling the display of the pixel by controlling the state where the light beam emitted from the light source is reflected by the movable reflecting portion and the reflected light beam is irradiated to the pixel and the state where the light beam is not irradiated is used. It was. As a result, the image display can be controlled at high speed, the number of controllable pixels can be increased, the number of pixels can be increased with a simple structure, and the display device can be increased in size and definition. It was.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view schematically showing a part of a conventional alternating current (AC) drive type PDP (plasma display panel).
FIG. 2 is a diagram for explaining an arrangement of electrodes of a conventional PDP.
FIG. 3 is a diagram showing a state of voltage application to an electrode of a conventional PDP.
FIG. 4 is a diagram schematically showing a breakdown of a field period.
FIG. 5 is a cross-sectional perspective view schematically showing a part of the structure of the alternating current (AC) drive type PDP according to the first embodiment.
6A is a partially enlarged cross-sectional view of the PDP in FIG. 1, and FIG. 6B is a cross-sectional view taken along line AA in FIG.
7 is a diagram for explaining an arrangement of electrodes of the PDP in FIG. 5;
8 is a diagram showing a state of voltage application to an electrode of the PDP in FIG.
FIG. 9 is a diagram schematically showing a light source that emits light rays and a reflection part that reflects the light rays according to the second embodiment.
10A is an enlarged perspective view of the reflecting portion of FIG. 9, and FIG. 10B is a cross-sectional view taken along the line BB of FIG.
FIGS. 11A to 11C are diagrams illustrating a method of installing the light source and the reflection unit in FIG. 9;
12 is a diagram illustrating a result of evaluating, by simulation, a range in which light beams are applied to the pixels of the PDP in FIG. 5 by the light source unit and the reflection unit in FIG.
13 is a diagram showing a modification of the installation method of the light source and the reflector in FIG.
FIG. 14 is a perspective view schematically illustrating an example in which a light source and a reflection unit are installed in a display device.
15 is a diagram showing an equivalent circuit of a display device having a light receiving portion and a light emitting portion, in which image display can be controlled by the light source and the reflection portion of FIG.
16 is a cross-sectional view schematically illustrating a configuration of a pixel of the display device in FIG.
[Explanation of symbols]
10, 20, 100 Plasma display panel
10A Panel body
11, 101 Back plate
12,102 Data electrode
13, 103, 19, 109 Dielectric film
14,104 Bulkhead
15,105 phosphor film
16,106 discharge space
17,107 Front plate
18,108 Display electrode
18SC, 108SC, SCN Scan electrode
18SU, 108SU, SUS sustain electrode
20,110 Protective film
P, P1, Pl pixels
LS, LS ′, LS1, LS2, LS3, LS4
LS0 ray emission source
LN lens
R0, R1, R2 rays
M, M ', M1, M2, M3, M4 Reflector
θ Operating angle
m Reflective mirror
W substrate
W1 electrode
W2 Hinge part
W3 holding part
H, t, t0, Hi height
D, D0 thickness
Wi width
Ed end
a1, a2, a3, a4 region
30 Display device
31 substrates
31a opening
32 Bulkhead
33 electrodes
34 Receiver
35 Light emitting part
36 connection lines
37 lenses

Claims (7)

Display pixels;
A light source emitting light,
A display device comprising: a movable reflecting portion that reflects the light beam and irradiates the pixel to control display of the pixel. The movable reflector is
A plurality of reflecting mirrors;
The display device according to claim 1, further comprising a control unit that controls a reflection angle of the light beam of the reflection mirror. The pixel is
A first substrate;
A second substrate facing the first substrate;
A first electrode formed on a side of the first substrate facing the second substrate;
A second electrode formed on a side of the second substrate facing the first substrate;
3. The display device according to claim 1, further comprising a discharge space formed between the first and second electrodes. 4. The display device according to claim 3, wherein discharge is controlled in the discharge space by a photoelectric effect caused by irradiation of the light beam. The display according to claim 4, wherein the second electrode is covered with a protective film, and discharge of the discharge space is controlled by a photoelectric effect generated by irradiating the protective film with the light beam. apparatus. The display device according to claim 1, wherein a plurality of the movable reflecting portions are provided. The display device according to claim 1, wherein a plurality of the light sources are provided.

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