JP6231785B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device.

  In recent years, displays such as PDP (Plasma Display Panel) and LCD (Liquid Crystal Display) have been developed to have large screens and ultra-high definition in order to display realistic images. In addition, in order to display an image with an integral stereoscopic method that enables natural stereoscopic vision, the pixel pitch needs to be about several μm, and the holographic stereoscopic method requires a pixel pitch of 1 μm or less. Therefore, there is a demand for further high definition display.

  In a conventional typical matrix type display, a plurality of scanning electrodes and data electrodes are stretched like a mesh in a lattice shape, and the spacing between the electrodes becomes further narrower as the display becomes higher in definition. Then, in a certain electrode, a voltage applied to the electrode adjacent to the electrode may become a noise source. Further, as the display becomes larger, the electrodes become thinner and longer, so that the wiring resistance of the electrodes increases. Furthermore, the stray capacitance of the panel also increases. For this reason, the time constant of the voltage pulse determined by the wiring resistance and stray capacitance becomes large, and even if a rectangular wave voltage pulse is applied, the waveform collapses at the edge of the panel far from the voltage supply unit. It was. In addition, due to this, there is a problem that high-speed switching cannot be performed, or a sufficient voltage is not applied to the pixels, and image display cannot be performed.

  For example, in a plasma display panel, a time-division gradation display method is used, and in order to display an image with 256 gradations, at least eight subfields (SF) are required for one field. Each subfield includes an initialization period in which the state of the discharge space of all the subpixels is uniformly initialized, a writing period in which light emission is selected for each subpixel, and a display period in which light is emitted. In the writing period, scanning is performed by the scanning electrode and the data electrode (or address electrode). A display discharge is performed by sequentially applying a scan voltage to the scan electrodes and a data voltage (or address voltage) to the data electrodes. As the number of scans increases as the display becomes higher in definition, the writing time in each subfield becomes longer. In order to perform the initialization discharge, the write discharge, and the display discharge within one field, the display period may be shortened as much as the write time is increased. In addition, a predetermined time width is required for the voltage pulse for generating the write discharge. For example, when driving a plasma display having a voltage pulse width of 0.5 μsec and 4000 scanning lines and 8 subfields, a writing period of 16 msec is required. Then, since one field is usually 16.7 msec, almost all of one field becomes a writing period.

  Further, for example, in FED (Field Emission Display), scanning is performed using a gate electrode as a scanning electrode and a cathode electrode as a data electrode. Specifically, when a scanning voltage is applied to the gate electrode and a data voltage is applied to the cathode electrode, electrons are emitted from the cold cathode, and the phosphor is excited to emit light. Normally, display is performed by selecting one scan electrode and applying a data voltage to each data electrode when a scan voltage is applied to the scan electrode. Therefore, the light emission period of each scanning line is one horizontal scanning period (1H). As the number of scans increases as the display becomes higher in definition, 1H becomes shorter and the luminance decreases.

  In order to solve such a problem, a wavelength-multiplexed optical address type display has been proposed in which a plurality of scanning lines are selected at a time using a plurality of wavelengths of light, and a plurality of scanning lines can be scanned simultaneously ( For example, see Patent Documents 1 and 2). In such a wavelength multiplexed optical address type display, the data electrode is separated for each subpixel, and a photoconductive film, a photoelectrode, a color filter, and a waveguide are provided below the data electrode. Light having a plurality of wavelengths on which data of different scanning lines are superimposed is propagated through the waveguide, and light transmitted through the color filter is selected. The resistance value of the photoconductive film is lowered by the light transmitted through the color filter, and a voltage is applied to the data electrode. By synchronizing the data of each scanning line superimposed on light of a plurality of wavelengths and the voltage applied to the plurality of scanning lines, the plurality of scanning lines can be addressed simultaneously. As a result, the address can be speeded up.

JP 2007-333887 A JP 2010-191481 A

  By the way, in the configuration described in Patent Documents 1 and 2, the address light emitted from the light source reduces the resistance value of the photoconductive film, current flows from the transparent electrode, and voltage is applied to the data electrode.

  However, since the potential of the transparent electrode is always kept at a constant value, when the address light emission stops, the potential of the data electrode does not drop sufficiently and the operation becomes unstable and erroneous light emission occurs. There is a possibility of waking up.

  Further, since the transparent electrode spreads over the entire screen, a potential is also generated in the data electrode of the pixel that does not emit light, and there is a possibility that electric charge remains. This may affect the pixel selection.

  SUMMARY An advantage of some aspects of the invention is that it provides an image display device capable of performing address selection at high speed and with certainty.

An image display device according to an aspect of the present invention includes a data electrode provided for each of a plurality of subpixels provided in a matrix, and a plurality of the data electrodes provided on one side of the data electrode in the thickness direction. And a plurality of types of color filters having different transmission wavelengths corresponding to the width of the waveguide are arranged for each subpixel corresponding to the data electrode. , A color filter array provided on the waveguide, a light source portion that selectively emits light having a wavelength that passes through the plurality of types of color filters, and enters the waveguide, and extends in a row direction. a scan electrode having a plurality of light transmitting said provided on the color filter array so as to overlap with the data electrode when viewed from the top, provided between the data electrode and the scanning electrode, light is incident A photoconductive film that reduces a resistance value and applies a voltage applied to the scan electrode to the data electrode, and resets the potential of the data electrode at the end of the address period of the light source unit. Having a reset period.

  It is possible to provide an image display device capable of performing address selection at high speed and with certainty.

It is the perspective view which showed an example of the data electrode drive part of the image display apparatus which concerns on the Example of this invention. It is the figure which showed an example of the image display apparatus provided with the data electrode drive part which concerns on Example 1 of this invention. FIG. 2A is a diagram illustrating a cross-sectional configuration in the column direction of the image display apparatus according to the first embodiment. FIG. 2B is a plan view illustrating components related to address selection of the image display apparatus according to the first embodiment. FIG. 6 is a diagram for explaining an operation of the image display apparatus according to the first embodiment. FIG. 3A is a diagram in which coordinates are arranged on the plan view of the image display apparatus according to the first embodiment, and FIG. 3B is a diagram illustrating drive voltage waveforms applied to the data electrodes and the scan electrodes. is there. It is the figure which showed an example of the image display apparatus which concerns on Example 2 of this invention. 4A is a cross-sectional configuration diagram of the image display apparatus according to the second embodiment, and FIG. 4B is a plan configuration diagram of the image display apparatus according to the second embodiment. It is the figure which showed an example of the image display apparatus which concerns on Example 3 of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<Example 1>
FIG. 1 is a perspective view illustrating an example of a data electrode driving unit of an image display apparatus according to an embodiment of the present invention. In FIG. 1, the data electrode driver of the image display apparatus according to the present embodiment includes a back substrate 10, a waveguide 20, a color filter array 30, a transparent electrode 40, a photoconductive film 50, and a data electrode 60. Is provided. A waveguide 20 is provided above the back substrate 10, and a color filter array 30 is provided on the waveguide 20. A plurality of transparent electrodes 40 extending in the row direction are provided on the color filter array 30, and a photoconductive film 50 is provided on the transparent electrodes 40. A data electrode 60 is provided on the photoconductive film 50. The color filter array 30 is composed of a plurality of color filters 31.

  In FIG. 1, the data electrode 60 is provided for each pixel (not shown in FIG. 1) of the display panel of the image display device, and more specifically, for each sub-pixel. Further, since the color filter 31 is provided corresponding to the data electrode 60, it is also provided corresponding to each subpixel. The waveguide 20 is configured to have a width that includes two rows of data electrodes 60. Therefore, one waveguide 20 corresponds to two rows of data electrodes 60.

  Further, one transparent electrode 40 is assigned to two subpixels, and each transparent electrode 40 extends in the row direction. The transparent electrode 40 functions as a scanning electrode.

  The back substrate 10 and the photoconductive film 50 are configured to cover the entire display panel without being partitioned corresponding to the sub-pixels.

  The back substrate 10 is a substrate constituting the back side of the display panel, and for example, a transparent substrate such as a glass substrate is used.

  The waveguide 20 is a propagation path for propagating light, and is made of a material that allows easy propagation of light. The waveguide 20 may be composed of various materials and structures as long as light can be propagated without loss. For example, the waveguide 20 may be composed of a structure in which the periphery of the core is surrounded by a clad.

  The waveguide 20 is configured to extend in the column direction of the matrix display, that is, in the vertical direction of the screen. The waveguide 20 is configured to cover all the data electrodes 60 corresponding to the subpixels in the column direction of the screen and supply light to all the data electrodes 60 in the column direction.

  The waveguide 20 has a width including a plurality of data electrodes 60 in the width direction, that is, the row direction. In FIG. 1, the waveguide 20 is configured to cover two rows of data electrodes 60. Thereby, the width of the waveguide 20 can be increased. For example, even when the pixel pitch is 1 μm, the waveguide 20 corresponding to the pixel pitch of 2 μm can be provided, and the light in the waveguide 20 can be provided. Attenuation can be reduced. In addition, it is possible to select addresses in a plurality of columns at the same time, thereby enabling high-speed address selection. Note that the waveguide 20 only needs to have a width in which a voltage is appropriately applied to the corresponding data electrode 60, and the width of the waveguide 20 physically includes two columns of the data electrode 60. You don't have to have a width.

  In FIG. 1, the waveguide 20 covers two rows of data electrodes 60, but includes three rows, four rows, and more data electrodes 60 in the width direction depending on the application. Good. Details of this point will be described later.

  The color filter array 30 is a two-dimensional array of color filters 31 for transmitting light in a specific wavelength range. Since different types of color filters 31 provided in the color filter array 30 can select specific light out of the light incident on the waveguide 20 and transmit it to the upper photoconductive film 50. In addition, simultaneous scanning of a plurality of rows is possible.

  The transparent electrode 40 is an electrode for applying a voltage to the data electrode 60 to perform address selection. One transparent electrode 40 is allocated to two subpixels, and each transparent electrode 40 extends in the row direction. The transparent electrode 40 functions as a scanning electrode. The transparent electrodes 40 adjacent to each other are insulated from each other by an insulating layer.

  Since the transparent electrode 40 is transparent as the name suggests, it can transmit light and allow light to enter the upper photoconductive film 50. The transparent electrode 40 may be made of various materials as long as it is transparent and has sufficient conductivity to function as an electrode. For example, ITO (Indium Tin Oxide, Indium Tin Oxide) ).

  The photoconductive film 50 is a film having a property of reducing resistance when light enters. Due to this property, when light transmitted through the color filter array 30 and transmitted through the transparent electrode 40 is incident on the photoconductive film 50, the resistance of the photoconductive film 50 is reduced, and the voltage applied to the transparent electrode 40 is changed to the data electrode 60. And address selection is performed. The photoconductive film 50 may be made of various organic materials or inorganic materials as long as it has a property of reducing its own resistance value by the incidence of light.

  The data electrode 60 is an electrode provided in one-to-one correspondence with each pixel, that is, each subpixel. The plurality of transparent electrodes 40 (scanning electrodes) extend in a stripe shape in the row direction, the waveguides 20 extend in a stripe shape in the column direction so as to be orthogonal to the transparent electrodes 40 (scanning electrodes), and the data electrode 60 The address in the column direction is selected by the light incident on the waveguide 20. Address selection is performed by applying a voltage to the transparent electrode 40 (scanning electrode) in the row direction and applying the data electrode 60 in the column direction. In the image display apparatus according to the present embodiment, a plurality of rows are scanned. At the same time, light is incident on a plurality of columns. Details of this point will be described later.

  FIG. 2 is a diagram illustrating an example of an image display device including the data electrode driving unit according to the first embodiment of the present invention. FIG. 2 shows an example in which the image display unit (display panel) 140 of the image display device is configured as a passive matrix type organic EL (Electroluminescence) display.

  FIG. 2A is a diagram illustrating a cross-sectional configuration in the column direction of the image display apparatus according to the first embodiment. In FIG. 2A, the configuration below the data electrode 60 has already been described with reference to FIG. In FIG. 2, an insulating film 61 is formed between the plurality of data electrodes 60.

  The image display apparatus according to the first embodiment includes a back substrate 10, a waveguide 20, a color filter array 30, a transparent electrode 40, a photoconductive film 50, a data electrode 60, a source electrode 70, and a drain electrode 80. An organic active layer 90, an organic EL device layer 110, a transparent electrode 120, a front substrate 130, a light source unit 150, a partition 155, and a coupling unit 160.

  Among these, the back substrate 10, the waveguide 20, the color filter array 30, the transparent electrode 40, the photoconductive film 50, the data electrode 60, the source electrode 70, the drain electrode 80, and the organic active layer 90 The organic EL device layer 110, the transparent electrode 120, and the front substrate 130 constitute an image display unit 140.

  The source electrode 70, the data electrode 60, the drain electrode 80, and the organic active layer 90 constitute the thin film transistor 100 as a whole. The data electrode 60 corresponds to a gate electrode in the thin film transistor 100. Further, the data electrode 60 plays a role of a scanning electrode in the image display device. The thin film transistor 100 is a switching transistor in the image display device, and a driving transistor is omitted.

  In FIG. 2, the thin film transistor 100 has an example of a field effect transistor structure in which a drain electrode 80 and a source electrode 70 are present on a data electrode 60.

  The photoconductive film 50 is below the data electrode 60, the transparent electrode 40 is below the photoconductive film 50, the color filter array 30 is below the transparent electrode 40, and the waveguide 20 is below the color filter array 30. These are all provided between the back substrate 10 and the data electrode 60. The waveguide 20 is provided below the data electrode 60 in the thickness direction of the image display unit 140.

  An organic EL device layer 110 is provided on the drain electrode 80. Address selection is performed by the thin film transistor 100, and the organic EL device layer 110 is driven by a drive transistor (not shown).

  The organic EL device layer 110 is a display device layer composed of an organic light emitting diode. The detailed configuration is omitted in FIG.

  The transparent electrode 120 is formed on one surface of the organic EL device layer 110. The transparent electrode 120 can transmit light and allow the light to enter the organic EL device layer 110. The transparent electrode 120 may be made of various materials as long as it is transparent and has sufficient conductivity to function as an electrode. For example, ITO (Indium Tin Oxide, Indium Tin Oxide) ).

  The front substrate 130 is a substrate on the front side of the display panel, and a transparent substrate such as a glass substrate is used.

  The light source unit 150 is a light source for emitting light having a wavelength that passes through any one of the color filters of the color filter array 30. Accordingly, light sources 151 to 154 that emit light of different wavelengths are provided. For the light sources 151 to 154, light having a wavelength that passes through different color filters is selected. For example, a light source such as a color light emitting diode may be used as the light sources 151 to 154. Adjacent light sources 151 to 154 are partitioned by a partition 155.

  In FIG. 2, the light source unit 150 is configured as a 4-wavelength multiplexing data driving unit having four types of light sources 151 to 154.

  The coupling unit 160 is a part that couples light of different wavelengths emitted from the light source units 151 to 154. The coupling unit 160 couples separately emitted light and makes the light incident on the waveguide 20 as one light in which light of a plurality of wavelengths is mixed.

FIG. 2B is a plan view illustrating components related to address selection of the image display apparatus according to the first embodiment. In FIG. 2B, the light source unit 150 is shown on the left side and the image display unit 140 is shown on the right side. Specifically, the light sources 151 to 154 for two rows and two light guides having a width for two rows are shown. A waveguide 20, two rows of transparent electrodes 40, a data electrode 60 corresponding to 4 × 4 subpixels, and a color filter array 30 are shown. The color filter array 30 includes color filters 31 to 34 corresponding to the wavelengths of light emitted from the light sources 141 to 144. As shown in FIG. 2B, the light sources 151 to 154 emit light having wavelengths λ _{1 to} λ ₄ , respectively. Light having wavelengths λ ₁ to λ ₄ emitted from the light sources 151 to 154 is incident on the image display unit 140 through the waveguides T 1 and T 2.

  As shown in FIG. 2B, the transparent electrode 40 that is a scanning electrode extends in the row direction, and the waveguide 20 extends in the column direction with a width of two columns. For ease of understanding, the transparent electrode 40 is hereinafter referred to as scanning electrodes S12 and S34 depending on the arrangement. The scan electrode S12 corresponds to the subpixels in the first row and the second row, and the scan electrode S34 corresponds to the subpixels in the third row and the fourth row. FIG. 2B shows two scan electrodes S12 and S34. A plurality of scan electrodes S12 and S34 are provided corresponding to two subpixels in the column direction. In other words, the scan electrodes S12 and S34 are divided into two subpixels in the column direction.

The color filters 31 to 34 correspond to the light sources 151 to 154 with 2 rows × 2 columns as a unit. That is, λ ₁ emitted from the light source 151 is transmitted through the color filter 31, λ ₂ emitted from the light source 152 is transmitted through the color filter 32, and λ ₃ emitted from the light source 153 is transmitted through the color filter 33, and from the light source 154. The λ ₄ that emits light passes through the color filter 34. The color filters 31 to 34 are arranged in 4 units in 16 sub-pixels with 2 rows × 2 columns as one unit.

  FIG. 3 is a diagram for explaining the operation of the image display apparatus according to the first embodiment. FIG. 3A is a diagram in which coordinates are arranged on the plan view of the image display apparatus according to the first embodiment, and FIG. 3B is a diagram illustrating drive voltage waveforms applied to the data electrodes and the scan electrodes. is there.

  In the first embodiment, the transparent electrode 40 as the scan electrodes S12 and S34 is divided in the column direction in order to reset the potential of the data electrode 60 at the end of the address period.

  Here, the address period in the passive matrix organic EL refers to a period in which a specific subpixel is selected and addressed.

  Scan electrodes S12 and S34 have a reset period for resetting the potential of data electrode 60 at the end of the address period. In the reset period, the light emission of the light source unit 150 in the address period is ended early in order to reset the potential of the data electrode 60 at the end of the address period.

  That is, in Example 1, the light emission of the light source unit 150 in the address period is shortened by the reset period provided at the end of the address period.

  In the reset period at the end of the address period, the potential of the data electrode 60 can be sufficiently lowered by setting the scanning voltage applied to the scanning electrodes S12 and S34 to 0V. The length of the reset period is such that, by setting the scan voltage applied to the scan electrodes S12 and S34 to 0 V, the data electrode is not affected by erroneous light emission in the subpixel including the data electrode 60 where address selection is not performed. A period during which the potential of 60 can be sufficiently lowered.

  Therefore, the specific length of the reset period is such that erroneous light emission does not occur in the subpixel including the data electrode 60 for which address selection has not been performed, according to the characteristics of the image display unit 140 and the characteristics of the light source unit 150. In addition, a period during which the potential of the data electrode 60 can be sufficiently lowered may be set.

  FIG. 3A is a diagram in which coordinates are arranged in the diagram of FIG. 2B, and the coordinates of L11 to L14 and L21 to L24 are arranged on the two light sources 151 to 154 of the light source unit 150, and an image is obtained. The coordinates of F11 to F14, F21 to F24, F31 to F34, and F41 to F44 are arranged for the data electrode 60 of the display unit 140. The transparent electrode 40 is shown as scanning electrodes S12 and S34, and the two waveguides 20 are shown as waveguides T1 and T2. The color filters 31 to 34 are shown as color filters 31 to 34 corresponding to the light sources 151 to 154, respectively. In FIG. 3A, four color filters 31 to 34 of 2 rows × 2 columns are used as one unit, and two units of color filters 31 to 34 are provided on the waveguide T1 and two units on the waveguide T2. It is shown. Moreover, the light source 150 considers that each pixel of the LED arrays 151-154 is represented by L11-L14, L21-L24.

  FIG. 3B shows driving voltage waveforms of the light sources L11 to L14 and L21 to L24, and the scanning electrodes S12 and S34.

A voltage V _D is applied to each of the pixels L11 to L14 and L21 to L24 of the LED array, the optical axis is bent, and light is guided to the waveguides T1 and T2.

First, at time t ₀ , the voltage V _FS is applied to the scan electrode S 12 of the image display unit 140. Thereby, the scan electrode S12 is selected. At the same time, the voltage V _D is applied to the pixels L11, L12, L22, and L24 of the light source unit 150. As a result, light of wavelengths λ ₁ and λ ₂ enters the waveguide T1 of the image display unit 140, and light of wavelengths λ ₂ and λ ₄ enters the waveguide T2. Therefore, in the pixel on the waveguide T1, the light of the wavelengths λ ₁ and λ ₂ transmits F21, F22, F23, and F24, and in the pixel on the waveguide T2, the light of the wavelengths λ ₂ and λ ₄ is F32. , F34, F42, and F44. Here, since the scanning voltage is applied to the scanning electrode S12 and no scanning voltage is applied to the scanning electrode S34, only F21, F22, F32, and F42 emit light.

At time ta ₁ , the scan voltage applied to scan electrode S12 is set to 0V. Time ta ₁ is the time when the reset period provided at the end (end) of the address period starts. Reset period continues until the time _{t 1.} In the reset period from time ta ₁ to time t ₁ , the light emission of F21, F22, F32, and F42 is extinguished.

Next, at time _{t 1,} a scanning voltage applied to the scanning electrode S12 in the image display section 140 to 0, the voltage _{V FS} applied to the scanning electrode S34. As a result, the scan electrode S34 is selected. At the same time, the voltage V _D is applied to the pixels L11, L13, L22, and L23 of the LED arrays 151 to 154. Light having wavelengths λ ₁ and λ ₃ is incident on the waveguide T1 of the image display unit 140, and light having wavelengths λ ₂ and λ ₃ is incident on the waveguide T2. Therefore, in the sub-pixels on the waveguide T1, the light of the wavelengths λ ₁ and λ ₃ transmits F11, F13, F21, and F23, and in the sub-pixels on the waveguide T2, the light of the wavelengths λ ₂ and λ ₃ Passes through F31, F33, F42, and F44. Here, since the scanning voltage is applied to the scanning electrode S34 of the image display unit 140 and no scanning voltage is applied to the scanning electrode S12, only F13, F23, F33, and F44 on the scanning electrode S34 emit light. To do.

At time ta _2, the scanning voltage applied to the scanning electrode S34 is set to 0V. Time ta ₂ is the time when the reset period provided at the end (end) of the address period starts. Reset period continues until the time _{t 2.} In the reset period from time ta ₂ to time _{t 2, F13, F23, F33} , emission of F44 disappears.

  By repeating such an operation sequentially, two scanning lines of the image display unit 140 configured as an organic EL display can be scanned simultaneously to display an image. At this time, since light is incident on the waveguides T1 and T2 for the two columns together, even if the pixel pitch is narrow and the waveguides T1 and T2 are provided for one column, light attenuation is likely to occur. The width of the waveguides T1 and T2 can be widened and sufficient light can be propagated.

  As described above, the reset period ends light emission of the light source unit 150 in the address period early in order to reset the potential of the data electrode 60 at the end of the address period.

  In the reset period at the end of the address period, by setting the scanning voltage applied to the scanning electrodes S12 and S34 to 0V, the potential of the data electrode 60 can be sufficiently lowered, and the data electrode 60 in which address selection is not performed. The occurrence of erroneous light emission can be suppressed in sub-pixels including.

  When the emission of the address light stops, the potential of the transparent electrode 40 is lowered and the potential of the data electrode 60 is sufficiently lowered, so that erroneous light emission can be suppressed.

  As described above, according to the first embodiment, it is possible to provide an image display device capable of performing address selection at high speed and with certainty.

<Example 2>
FIG. 4 is a diagram illustrating an example of an image display apparatus according to the second embodiment of the present invention. 4A is a cross-sectional configuration diagram of the image display apparatus according to the second embodiment, and FIG. 4B is a plan configuration diagram of the image display apparatus according to the second embodiment.

  In the image display device according to the second embodiment, the image display unit 145 is configured as a plasma display panel. In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  4A, the image display unit 145 of the image display apparatus according to the second embodiment includes a back electrode 10, a waveguide 20, a color filter array 30, a transparent electrode 40, a photoconductive film 50, and data. The electrode 60, the scanning electrode 75, the sustain electrode 85, the dielectric layer 95, the discharge cell 105, the protective film 115, the dielectric layer 125, and the front substrate 130 are provided. In addition to the image display unit 145, the light source unit 150 and the coupling unit 160 are provided. In FIG. 4B, the transparent electrode 40 is shown as a scanning electrode S1234. 4A and 4B show one scanning electrode S1234, a plurality of scanning electrodes S1234 are provided corresponding to each of four subpixels in the column direction. In other words, the scan electrode S1234 is divided into four subpixels in the column direction.

  The scan voltage of the scan electrode S1234 is set to 0 V in the reset period at the end of the address period, similarly to the scan electrodes S12 and S34 of the first embodiment.

  Here, the back electrode 10, the waveguide 20, the color filter array 30, the transparent electrode 40, the photoconductive film 50, the data electrode 60, and the front substrate 130 of the image display unit 145 are the same as those in the first embodiment. Since they are the same components, the same reference numerals as those in the first embodiment are given and the description thereof is omitted.

  The dielectric layer 95 is an insulator layer for covering the data electrode 60. The discharge cell 105 corresponds to a sub-pixel that is a unit for generating discharge and performing light-emitting display. The discharge cell 105 is partitioned by a partition wall 106, and a phosphor layer 107 is provided on the surface thereof.

  The data electrode 60 may be called an address electrode.

  The protective film 115 is a protective film for protecting the dielectric layer 125 from light emitting discharge. The dielectric layer 125 is an insulator layer for covering the scan electrode 75 and the sustain electrode 85.

  The scan electrode 75 is an electrode for performing a write discharge (address discharge) and a display discharge (sustain discharge), and is provided in a stripe shape extending in the row direction. The sustain electrode 85 is an electrode for performing display discharge. The writing discharge is performed by applying a voltage between the scanning electrode 75 and the data electrode 60.

  On the other hand, the transparent electrode 40 as the scanning electrode S1234 is divided in the column direction in order to reset the potential of the data electrode 60 at the end of the address period.

  Similarly to the scan electrodes S12 and S34 of the first embodiment, the scan electrode S1234 has a reset period for resetting the potential of the data electrode 60 at the end of the address period. Unlike the so-called reset period in which reset discharge is performed for each cell of the plasma display, this reset period ends discharge in the address period early in order to reset the potential of the data electrode 60 at the end of the address period following the reset period. It is something to be made.

  Since the configurations of the light source unit 150 and the coupling unit 160 are the same as those of the image display apparatus according to the first embodiment, the same reference numerals as those in the first embodiment are given and description thereof is omitted.

  In FIG. 4B, the planar configuration of the image display apparatus according to the second embodiment is shown, but two electrodes of the scan electrode 75 and the sustain electrode 85 are arranged in parallel in the row direction through each subpixel. Except for the extended point, it has substantially the same configuration as the image display apparatus according to the first embodiment.

  The light emitted from the light source unit 150 enters the image display unit 145 through the waveguides T1 and T2.

  Further, since the driving method of the image display apparatus is the same as that of the first embodiment, the description thereof is omitted.

  According to the second embodiment, in the reset period at the end of the address period, by setting the scan voltage applied to the scan electrode S1234 to 0 V, the potential of the data electrode 60 can be sufficiently lowered, and address selection is performed. It is possible to suppress the occurrence of erroneous light emission in the sub-pixel including the data electrode 60 that is not.

  Therefore, when the emission of the address light stops, the potential of the transparent electrode 40 is lowered and the potential of the data electrode 60 is sufficiently lowered, so that erroneous light emission can be suppressed.

  According to the image display device according to the second embodiment, for the image display unit 145 configured with a plasma display panel, simultaneous scanning of a plurality of rows can be performed for a plurality of columns, and even when the pixel pitch is narrow, Address selection can be performed reliably and at high speed.

<Example 3>
FIG. 5 is a diagram illustrating an example of an image display apparatus according to the third embodiment of the present invention. The image display device according to the third embodiment is the same as the image display device according to the second embodiment in that the image display unit 146 is configured as a plasma display, but is an 8-wavelength multiplexed data electrode of 4 rows × 2 columns. The image display apparatus according to the second embodiment is different from the image display apparatus according to the second embodiment in that the drive unit is included.

In the image display apparatus according to the third embodiment, the light source unit 156 has eight different wavelengths of the wavelength lambda ₁ to [lambda] ₈ light L11～L18, as L21～L28. In addition, the color filter array 35 of the image display unit 146 includes _eight different color filters 35a to 35h that can transmit light having wavelengths λ _{1 to} λ ₈ . 5, the color filter 35a is a wavelength lambda _1, the color filter 35b is the wavelength lambda _5, the color filter 35c is the wavelength lambda _2, the color filter 35d is a wavelength lambda _6, the color filter 35e wavelength lambda _7, the color filter 35f wavelength lambda ₃ , the color filter 35 g is arranged to transmit the wavelength λ ₈ , and the color filter 35 h is configured to transmit the wavelength λ ₄ , and 4 rows × 2 columns constitute one unit for address selection.

Here, it is assumed that the wavelengths λ _{1 to} λ ₈ are sequentially longer in wavelength or shorter in order. In this case, paying attention to the arrangement of the color filters 35a to 35h, it can be seen that the wavelength of the light transmitted through the adjacent color filters 35a to 35h in the row or column does not include an arrangement that is continuous. In consideration of the case where the filtering characteristics of the color filters 35a to 35h are not perfect and the peripheral wavelength of the transmitting wavelength is also transmitted, the light of the adjacent color filters 35a to 35h is prevented from entering and mixing. It is a thing. If the row and column do not include the arrangement of the color filters 35a to 35h in which the wavelength range is continuous, the wavelengths of the light transmitted through the adjacent color filters 35a to 35h are greatly different, and the adjacent color filters 35a to 35h. It is possible to prevent unnecessary light from entering the light.

Incidentally, the driving of the image display apparatus according to the third embodiment, at time _{t 0,} while applying a scan voltage to the scan electrode _S PDP 1 _{to S PDP 4,} LED array L11~L18 light source unit 156, selects from L21~L28 This is performed by emitting the wavelength light transmitted through the corresponding color filters 35a to 35h of the sub-pixels and entering the waveguides T1 and T2. This makes it possible to simultaneously address selected for the scanning electrodes _S PDP 1 _{to S PDP 4} of 4 rows.

Although not shown in FIG. 5, at time _{t 1,} together with the scanning voltage is applied to the scanning electrodes _S PDP 5 _{to S PDP-8} on the right side of the scan electrode _S PDP 1 _{to S PDP 4,} LED array L11~L18 , L21 to L28 emit light having wavelengths λ ₁ to λ ₈ that pass through the color filters 35a to 35h provided in the sub-pixels for address selection, and the data electrode 60 is selected. Thereafter, the same procedure is sequentially repeated, so that address selection can be performed simultaneously for every four rows.

  In the image display apparatus according to the third embodiment, eight of the 2 × 4 columns of the color filters 35a to 35h are one unit, and this arrangement is a total of 18 data electrodes 60 of 2 × 4 columns or Repeatedly arranged in sub-pixel units.

  According to the third embodiment, the potential of the data electrode 60 can be sufficiently lowered by setting the scanning voltage applied to the scanning electrode S1234 to 0 V in the reset period at the end of the address period, and address selection is performed. It is possible to suppress the occurrence of erroneous light emission in the sub-pixel including the data electrode 60 that is not.

  Therefore, when the emission of the address light stops, the potential of the transparent electrode 40 is lowered and the potential of the data electrode 60 is sufficiently lowered, so that erroneous light emission can be suppressed.

In the first to third embodiments, the image display units 140, 145, and 146 are described as examples configured as organic EL panels or plasma display panels. However, the image display units 140, 145, and 146 are used as field emission arrays. It may be configured. In this case, the gate electrode may correspond to the scan electrode and the cathode electrode corresponds to the data electrode, and the configuration may be the same as in the first to third embodiments. However, the voltage V _FS needs to have a reverse polarity.

  Further, the image display units 140, 145, and 146 can be applied to various displays as long as they are passive matrix displays. For example, the image display units 140, 145, and 146 can also be applied to passive matrix liquid crystal displays.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

DESCRIPTION OF SYMBOLS 10 Back substrate 20 Waveguide 30 Color filter array 31-34, 35a-35h Color filter 40, 120 Transparent electrode 50 Photoconductive film 60 Data electrode 70 Gate electrode 75 Scan electrode 80 Drain electrode 85 Sustain electrode 90 Organic active layer 95, 125 Dielectric layer 105 Discharge cell 106 Bulkhead 107 Phosphor layer 110 Organic EL device layer 115 Protective film 130 Front substrate 140, 145, 146 Image display unit 150, 155, 156 Light source unit 151-154 Light source 155 Partition 160 Coupling unit

Claims (6)

A data electrode provided for each of a plurality of subpixels provided in a matrix;
A waveguide provided on one side of the data electrode in the thickness direction and having a width corresponding to a plurality of the data electrodes and extending in the column direction;
A plurality of types of color filters having different transmission wavelengths corresponding to the width of the waveguide are arranged for each of the subpixels corresponding to the data electrode, and a color filter array provided on the waveguide;
A light source unit that selectively emits light having a wavelength that passes through the plurality of types of color filters and enters the waveguide; and
A plurality of light-transmissive scanning electrodes provided on the color filter array so as to extend in a row direction and overlap the data electrodes in a top view;
A photoconductive film provided between the scan electrode and the data electrode, the resistance value being reduced when light is incident, and a voltage applied to the scan electrode being applied to the data electrode. The image display device has a reset period for resetting the potential of the data electrode at the end of the address period of the light source unit.   The image display device according to claim 1, wherein the light source unit stops light emission at the end of the address period, or shifts to a next address period at the end of the address period.   The image display device according to claim 1, wherein the image display device is configured as a passive matrix display. The data electrode is a gate electrode;
The image display device according to claim 3, wherein the image display device is configured as an electroluminescence display.   The image display device according to claim 3, wherein the data electrode is an address electrode and is configured as a plasma display. The data electrode is a cathode electrode;
The scanning electrode is a gate electrode;
The image display device according to claim 3, wherein the image display device is configured as a field emission display.

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