JP2010232268A - Lighting device, display device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust illumination light with which an object is irradiated so that its spectrum is constant even if the spectrum of external light changes. <P>SOLUTION: A lighting device 106 has a light-emitting element 212 and a light shield layer 216 between a first substrate 217 and a second substrate 211 which are mutually transparent. A light-emitting layer 214 of the light-emitting element 212 is divided into a first region (R) for emitting red light, a second region (G) for emitting green light, and a third region (B) for emitting blue light. Further, at least one of a first electrode 215 and a second electrode 213 opposed to each other across the light-emitting layer 214 is divided into a partial electrode provided at a position opposed to the first region, a partial electrode provided at a position opposed to the second region, and a partial electrode provided at a position opposed to the third region. Light beams emitted from the first region, second region, and third region and external light incident on the lighting device 106 from an observer side through a part which does not overlap the light shield layer 216 is emitted as illumination light through the second substrate 211. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device, a display device, and an electronic device.

Some reflective liquid crystal devices include a front light so that an image can be displayed even in a dark environment where the amount of external light is insufficient. In addition, there is one using an organic electroluminescence element as a light source of a front light (for example, Patent Document 1).
In addition, in a reflective liquid crystal device equipped with a front light, not only light emitted from the front light but also outside light such as room light and sunlight is incident on the liquid crystal panel. Affects. For this reason, Patent Document 2 detects both the external light and the irradiation light from the front light as the display surface illuminance of the liquid crystal panel, and feedback controls the light emission amount of the front light according to the detected display surface illuminance. It is described that the optimum display brightness is maintained.

JP 2006-154402 A Japanese Patent No. 40622254

  For example, when the display device is used indoors at night, light from a fluorescent lamp or an incandescent lamp becomes external light, but when the display device is used outdoors during the day, sunlight becomes external light. As described above, the spectrum of external light changes according to the use environment of the display device. However, in Patent Document 2, the amount of light emitted from the front light is only adjusted according to the change in the intensity of external light. When the light spectrum changes, the color of the display image changes. For example, when the display device is used under an incandescent lamp, the light of the incandescent lamp contains a lot of components on the long wavelength side in the visible light region, so that the display image is entirely reddish. .

  The present invention has been made in view of the above-described problems, and provides an illuminating device capable of adjusting illumination light applied to an object so that the spectrum is constant even when the spectrum of external light changes. Is an issue. It is another object of the present invention to provide a display device that can keep the color and reproducibility of a display image constant even when the spectrum of external light changes, and an electronic device using the display device.

  In order to solve the above-described problems, an illumination device according to the present invention is an illumination device that irradiates an object with illumination light, and is opposed to the transparent first substrate located on the observer side and the first substrate. And a transparent second substrate positioned on the object side, a light emitting element that is provided between the first substrate and the second substrate, and emits light, and between the light emitting element and the first substrate. A light-shielding layer that shields light emitted from the light-emitting element toward the first substrate, a light-emitting layer formed of a light-emitting material, a first electrode facing the light-emitting layer, and the first electrode And the light emitting layer is divided into a first region that emits red light, a second region that emits green light, and a third region that emits blue light. At least one of the electrode and the second electrode is a first provided at a position facing the first region. Divided into a split electrode, a second partial electrode provided at a position facing the second region, and a third partial electrode provided at a position facing the third region, the first region and the The light emitted from each of the second region and the third region and the external light incident from the observer side through the first substrate are used as the illumination light as the target through the second substrate. The light is emitted to the object side.

According to the above configuration, the light emitting layer of the light emitting element is divided into a first region that emits red light, a second region that emits green light, and a third region that emits blue light. Further, at least one of the first electrode and the second electrode facing each other with the light emitting layer interposed therebetween is a first partial electrode provided at a position facing the first region and a first electrode provided at a position facing the second region. It is divided into two partial electrodes and a third partial electrode provided at a position facing the third region.
Therefore, the amount of red light emitted from the first region can be adjusted by changing the potential difference between the first partial electrode and the other electrode facing each other across the first region, and facing across the second region. The amount of green light emitted from the second region can be adjusted by changing the potential difference between the second partial electrode and the other electrode, and the third partial electrode and the other electrode facing each other across the third region The amount of blue light emitted from the third region can be adjusted by changing the potential difference between the first region and the third region. That is, the intensity of the red light emitted from the first area, the intensity of the green light emitted from the second area, and the intensity of the blue light emitted from the third area can be individually adjusted. Even if the spectrum of light changes, the illumination light applied to the object can be adjusted so that the spectrum is constant.

  In the above-described illumination device, the first region and the second region are configured so that the spectrum of the illumination light is constant based on a detection unit that detects a spectrum of external light and a detection result of the detection unit. A configuration may further include adjusting means for adjusting the amount of light emitted from each of the third regions. In this case, the spectrum of the illumination light applied to the object can be kept constant even if the spectrum of the external light changes.

  In the above-described illumination device, the adjustment unit is configured to adjust the amount of light emitted from each of the first region, the second region, and the third region so that the illumination light becomes white light. Also good. In this case, the illumination light applied to the object can be kept white even if the spectrum of the external light changes.

  Moreover, the structure which detects each intensity | strength of the red light, the green light, and the blue light which are contained in external light in the illuminating device mentioned above may be sufficient. Illumination light is controlled so that its spectrum is constant by adjusting the amount of red, green, and blue light, so it is included in external light without analyzing the spectrum of external light in detail. By detecting the intensity of each of the red light, the green light, and the blue light, the minimum information necessary for adjusting the spectrum of the illumination light can be obtained.

  In the above-described illumination device, the detection means transmits the red light transmissive film that transmits red light, the green transmissive film that transmits green light, the blue transmissive film that transmits blue light, and the red transmissive film. A first light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light; a second light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light transmitted through the green transmission film; A third light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light transmitted through the blue transmission film, and the transmission characteristics of the red transmission film are in the spectrum of red light emitted from the first region. The transmission characteristics of the green transmission film are determined according to the spectrum of green light emitted from the second region, and the transmission characteristics of the blue transmission film are determined according to the blue light emitted from the third region. Structures determined according to the spectrum It may be. In this case, the spectrum of illumination light can be adjusted accurately.

  Further, in the lighting device described above, the light emitting element may be an organic electroluminescence element. Since the organic EL element has such features as being thin and light, the lighting device can be made thinner and lighter.

In addition, a display device according to the present invention includes any one of the illumination devices described above and a display unit that displays an image, and the second substrate of the illumination device is displayed on a display surface of the display unit on which an image is displayed. Is in contact with each other.
In this case, the lighting device individually adjusts the intensity of the red light emitted from the first area, the intensity of the green light emitted from the second area, and the intensity of the blue light emitted from the third area. Therefore, even if the spectrum of external light changes, the illumination light irradiated on the display surface can be adjusted so that the spectrum becomes constant. Therefore, even if the spectrum of external light changes, the color of the image displayed on the display surface can be kept constant. Further, when the display device is a reflective display device such as a reflective liquid crystal device or electronic paper, the color reproducibility can be kept constant.

  In addition, an electronic apparatus according to the present invention includes the above-described display device. Electronic devices include, for example, personal computers and mobile phones.

It is a block diagram which shows the structure of the display apparatus which concerns on this embodiment. It is A-A 'sectional drawing in FIG. It is sectional drawing (bottom emission type) which shows the detailed structure of a front light. It is sectional drawing (top emission type) which shows the detailed structure of a front light. It is sectional drawing which shows the structure of an optical sensor. It is a graph which shows the relationship between the permeation | transmission characteristic of each permeable film (R, G, B) with which an optical sensor is equipped, and the emission spectrum of each light emitting layer (R, G, B) with which a light emitting element is equipped. It is a perspective view which shows the specific example of the electronic device which concerns on this invention. It is a perspective view which shows the specific example of the electronic device which concerns on this invention. It is a perspective view which shows the specific example of the electronic device which concerns on this invention.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the ratio of dimensions of each part is different from the actual one. Moreover, the same code | symbol is attached | subjected to the common part in each figure.

<1. Embodiment>
FIG. 1 is a block diagram illustrating a configuration of a display device 1 according to the present embodiment.
As shown in the figure, the display device 1 includes a reflective liquid crystal panel 101. In the display area 102 of the reflective liquid crystal panel 101, although not shown, a plurality of scanning lines extending in the row direction and a plurality of data lines extending in the column direction are formed. A liquid crystal element is provided at a position corresponding to each intersection with the data line. In addition, the display device 1 includes a scanning line driving circuit 103 that drives scanning lines, a data line driving circuit 104 that drives data lines, and a control circuit 105 that controls these circuits 103 and 104.

  The control circuit 105 supplies a control signal C 1 including a clock signal and the like to the scanning line driving circuit 103. The control circuit 105 supplies a control signal C2 including a data signal corresponding to an image to be displayed to the data line driving circuit 104. The scanning line driving circuit 103 sequentially selects the scanning lines one by one based on the control signal C1. Further, the data line driving circuit 104 sends a data signal corresponding to the gradation to be displayed to each of the liquid crystal elements for one row corresponding to the selected scanning line via the data line based on the control signal C2. Supply.

  A front light 106 is bonded to the front surface (display surface FS) of the reflective liquid crystal panel 101 so as to cover the entire display area 102. As will be described in detail later, the front light 106 includes a plurality of light emitting elements as light sources. Each light emitting element is an organic EL element in which a light emitting layer formed of an organic EL material is sandwiched between two electrodes, and emits light when holes and electrons injected from the two electrodes are combined in the light emitting layer. . The light emitting layer is divided into a region that emits red light, a region that emits green light, and a region that emits blue light. The optical sensor 107 detects the spectrum of external light and supplies the detection result DA to the control circuit 105. Based on the detection result DA, the control circuit 105 generates a control signal C3 for controlling the light emission amount of each light emitting element for each of red light, green light, and blue light. The dimming circuit 108 adjusts the light emission amount of each light emitting element for each of red light, green light, and blue light based on the control signal C3.

  As described above, the front light 106, the optical sensor 107, the control circuit 105, and the dimming circuit 108 constitute an illumination device that illuminates the display area 102 of the reflective liquid crystal panel 101 from the front. The optical sensor 107, the control circuit 105, and the dimming circuit 108 constitute an adjusting unit that adjusts the spectrum of the irradiation light from the front light 106.

FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG.
On the display substrate 201, in addition to a plurality of TFTs (thin film transistors) 202, various wirings (not shown) such as data lines and scanning lines are formed. The surface of the display substrate 201 on which these TFTs 202 and wirings are formed is covered with an insulating layer 203. A plurality of pixel electrodes 204 are formed on the insulating layer 203. Each pixel electrode 204 is formed of a light reflective material such as aluminum, and is electrically connected to the corresponding TFT 202 via a contact hole.

  A common electrode 206 is formed on the surface of the counter substrate 207 facing the display substrate 201. The counter substrate 207 is formed of a transparent material, and the common electrode 206 is also formed of a transparent material having conductivity. The counter substrate 207 and the display substrate 201 are bonded to each other with a predetermined gap, and a liquid crystal 205 is filled between the common electrode 206 and each pixel electrode 204. One pixel electrode 204, a part of the common electrode 206 facing the pixel electrode 204, and the liquid crystal 205 sandwiched therebetween constitute one liquid crystal element LC. The light transmittance of the liquid crystal 205 changes for each liquid crystal element LC according to the potential difference between the pixel electrode 204 and the common electrode 206.

  On the other hand, a light scattering layer 208 and a polarizing plate 209 are stacked on the other surface of the counter substrate 207 (the surface not facing the display substrate 201). The polarizing plate 209 is for polarizing illumination light from the front light 106 (emitted light from each light emitting element 212 + external light) in a predetermined direction. The light scattering layer 208 is for scattering light incident from the polarizing plate 209 and irradiating the pixel electrodes 204 uniformly. Further, the reflective liquid crystal panel 101 and the front light 106 are bonded by the resin layer 210 formed on the polarizing plate 209.

  The front light 106 includes a transparent second substrate 211 provided on the resin layer 210, a plurality of light emitting elements 212 formed on the second substrate 211, and a light shielding layer 216 formed on each light emitting element 212. And a transparent first substrate 217 provided to face the second substrate 211 in order to protect each light emitting element 212 from the outside air and moisture. The first substrate 217 and the second substrate 211 are formed of a transparent material such as glass.

  The light blocking layer 216 is provided for the purpose of blocking light emitted from the light emitting element 212 toward the upper side (observer side) in the figure and preventing the decrease in contrast. It is desirable not to reflect external light incident on the substrate 217. For this reason, the light shielding layer 216 is formed of a material having low light reflectance (for example, chromium, chromium oxide, or zinc oxide). The plurality of light emitting elements 212 are arranged separately from each other, and are arranged in a staggered arrangement or a matrix, for example, when the front light 106 is viewed from the observer side. The same applies to the light shielding layer 216. Further, the light emitting element 212 and the light shielding layer 216 are formed in a fine pattern that does not interfere with the visual recognition of the display image.

  Each light emitting element 212 includes a light emitting layer 214 formed of a light emitting material, and a first electrode 215 and a second electrode 213 that face each other with the light emitting layer 214 interposed therebetween. The light emitting layer 214 is divided into a first region (R) that emits red light, a second region (G) that emits green light, and a third region (B) that emits blue light. Of the first electrode 215 and the second electrode 213, the second electrode 213 located on the reflective liquid crystal panel 101 side is formed of a conductive transparent material.

  The front light 106 emits light emitted from each light emitting element 212 (red light + green light + blue light) and external light incident from the observer side through a portion where each light shielding layer 216 is not disposed. The reflective liquid crystal panel 101 is irradiated as illumination light. The illumination light passes through the resin layer 210, the polarizing plate 209, the light scattering layer 208, the counter substrate 207, and the common electrode 206, enters the liquid crystal 205, and is reflected by each pixel electrode 204. The light reflected by each pixel electrode 204 returns to the front light 106 through the same path, and reaches the viewer side through a portion where each light shielding layer 216 is not disposed. Note that the light transmittance of the liquid crystal 205 changes for each liquid crystal element LC according to the potential difference between each pixel electrode 204 and the common electrode 206. For this reason, the intensity of light reflected for each pixel electrode 204 is controlled, and gradation display by light modulation is realized.

FIG. 3 is a cross-sectional view showing a detailed structure of the front light 106.
In the figure, only a part of the front light 106 (a part corresponding to one light emitting element 212) is shown. The structure shown in the figure is a bottom emission type. A wiring layer 218 is formed on the second substrate 211. In addition, partition walls 219 a to 219 d are formed on the surface of the wiring layer 218. The partition walls 219a to 219d are formed of an insulating transparent material such as acrylic or polyimide.

  A red light emitting layer 214r (first region) that emits red light and a partial electrode 213r are formed between the partition walls 219a and 219b, and a green light that emits green light is formed between the partition walls 219b and 219c. A light emitting layer 214g (second region) and a partial electrode 213g are formed, and a blue light emitting layer 214b (third region) that emits blue light and a partial electrode 213b are formed between the partition 219c and the partition 219d. A first electrode 215 is formed over the entire surface of the light emitting layers 214r to 214b and the partition walls 219a to 219d. A light shielding layer 216 is formed for each light emitting element 212 on the surface of the first substrate 217 facing the second substrate 211.

  Thus, the light emitting layer 214 is divided into a red light emitting layer 214r, a green light emitting layer 214g, and a blue light emitting layer 214b. In addition, the second electrode 213 includes a partial electrode 213r provided at a position facing the red light emitting layer 214r, a partial electrode 213g provided at a position facing the green light emitting layer 214g, and a position facing the blue light emitting layer 214b. Are divided into partial electrodes 213b. Therefore, the amount of light emitted from the red light emitting layer 214r can be adjusted by changing the potential difference between the first electrode 215 and the partial electrode 213r, and green by changing the potential difference between the first electrode 215 and the partial electrode 213g. The amount of light emitted from the light emitting layer 214g can be adjusted, and the amount of light emitted from the blue light emitting layer 214b can be adjusted by changing the potential difference between the first electrode 215 and the partial electrode 213b. That is, the intensity of the red light emitted from the red light emitting layer 214r, the intensity of the green light emitted from the green light emitting layer 214g, and the intensity of the blue light emitted from the blue light emitting layer 214b can be individually adjusted. .

  A fixed potential such as a power supply potential is applied to the first electrode 215. Therefore, the light control circuit 108 can adjust the intensity of the red light emitted from the red light emitting layer 214r by changing the magnitude of the potential applied to the partial electrode 213r. The dimming circuit 108 can adjust the intensity of the green light emitted from the green light emitting layer 214g by changing the magnitude of the potential applied to the partial electrode 213g. Further, the dimming circuit 108 can adjust the intensity of the blue light emitted from the blue light emitting layer 214b by changing the magnitude of the potential applied to the partial electrode 213b.

  Note that the wiring layer 218 described above is applied with a wiring for applying a fixed potential to the first electrode 215 and the potential instructed by the dimming circuit 108 to each of the partial electrode 213r, the partial electrode 213g, and the partial electrode 213b. Wiring for this purpose is formed. Each of the red light emitting layer 214r, the green light emitting layer 214g, and the blue light emitting layer 214b includes an electron blocking layer, a hole injection layer, a hole transport layer, and an electron transport layer in addition to the light emitting layer formed of an organic EL material. In addition, part or all of the electron injection layer and the hole blocking layer may be included.

  Moreover, although the bottom emission structure is illustrated in FIG. 3, a top emission structure may be used as shown in FIG. In the case of the top emission structure, the light emitting element 212 is formed on the first substrate 217 as shown in FIG. In addition, the first electrode 215 is positioned to face the red light emitting layer 214r, the partial electrode 215r provided to face the green light emitting layer 214g, and the position facing the blue light emitting layer 214b. The second electrode 213 serves as a common electrode.

FIG. 5 is a cross-sectional view showing the structure of the optical sensor 107.
As shown in the figure, the optical sensor 107 includes a color filter 301 and three photodiodes 302r, 302g, and 302b. The color filter 301 is provided at the boundary between these red transmission films 301r that transmit red light, green transmission films 301g that transmit green light, and blue transmission films 301b that transmit blue light. With a black matrix.

  The photodiode 302r is provided with a light receiving surface at a position facing the red transmissive film 301r, receives light that has passed through the red transmissive film 301r out of external light, and has a current value (or voltage value) having a magnitude corresponding to the amount of received light. ) As a detection signal DAr. The photodiode 302g is provided with a light receiving surface at a position facing the green transmission film 301g, receives light that has passed through the green transmission film 301g out of external light, and has a current value (or voltage value) having a magnitude corresponding to the amount of received light. ) As a detection signal DAg. The photodiode 302b is provided with a light receiving surface at a position facing the blue transmissive film 301b, receives light that has passed through the blue transmissive film 301b out of external light, and has a current value (or voltage value) having a magnitude corresponding to the amount of received light. ) To the control circuit 105 as a detection signal DAb. Thus, the photodiode 302r detects the intensity of red light included in the external light, the photodiode 302g detects the intensity of green light included in the external light, and the photodiode 302b detects the intensity of blue light included in the external light. Is detected.

  Although not shown, the transmission characteristics of the color filters R, G, and B of each liquid crystal element LC are determined so that appropriate color reproduction can be performed by the incidence of natural light. The spectrum of red light emitted from the red light emitting layer 214r of each light emitting element 212 is designed according to the transmission characteristics of the color filter R of the liquid crystal element LC, and light is emitted from the green light emitting layer 214g of each light emitting element 212. The spectrum of green light to be emitted is designed according to the transmission characteristics of the color filter G of the liquid crystal element LC, and the spectrum of blue light emitted from the blue light emitting layer 214b of each light emitting element 212 is the color of the liquid crystal element LC. Designed to match the transmission characteristics of Filter B.

  As shown in FIG. 6, the transmission characteristic Pr of the red transmissive film 301r provided in the optical sensor 107 depends on the peak value or half-value width of the spectrum Sr of the red light emitted from the red light emitting layer 214r of the light emitting element 212. The transmission characteristic Pg of the green transmissive film 301g provided in the optical sensor 107 is determined in accordance with the peak value or half-value width of the spectrum Sg of green light emitted from the green light emitting layer 214g of the light emitting element 212. In addition, the transmission characteristic Pb of the blue transmission film 301b included in the optical sensor 107 is determined according to the peak value and the half-value width of the spectrum Sb of the blue light emitted from the blue light emitting layer 214b of the light emitting element 212.

  The optical sensor 107 outputs the intensity of the red light included in the external light to the control circuit 105 as the detection signal DAr, and outputs the intensity of the green light included in the external light to the control circuit 105 as the detection signal DAg. The intensity of the included blue light is output to the control circuit 105 as a detection signal DAb. Further, the control circuit 105 and the dimming circuit 108 make the illumination light emitted from the front light 106 become white light based on the detection signals DAr, DAg, and DAb (that is, insufficient for the spectrum of white light). For all of the light emitting elements 212, the intensity of the red light emitted from the red light emitting layer 214r, the intensity of the green light emitted from the green light emitting layer 214g, and the light emitted from the blue light emitting layer 214b. Adjust the intensity of blue light. As described above, the illumination light emitted from the front light 106 includes the light emitted from each light emitting element 212 (red light + green light + blue light) and the light shielding layers 216 from the viewer side. This light is combined with outside light that has entered the front light 106 through the portion.

  For example, when the display device 1 is used under an incandescent lamp, the external light contains a lot of red light components, so that the intensity of green light and blue light emitted from each light emitting element 212 is increased. As a result, the illumination light emitted from the front light 106 becomes white light. Further, when the display device 1 is used in an environment with a large amount of blue light component, the intensity of red light and green light emitted from each light emitting element 212 is increased, and the light is emitted from the front light 106. Make the illumination light white light.

As described above, the display device 1 detects the spectrum of the external light and compensates the amount of light emitted from each light emitting element 212 for each of the red light, the green light, and the blue light so as to compensate for the lack of the white light spectrum. Adjust every time. Accordingly, the illumination light applied to the reflective liquid crystal panel 101 is always white light having a constant spectrum even if the spectrum of the external light changes. Therefore, the color reproducibility of the display device 1 can be kept constant even if the spectrum of the external light is different.
Further, as shown in FIG. 6, the transmission characteristic Pr of the red transmissive film 301r provided in the photosensor 107 is determined according to the emission spectrum Sr of the red luminescent layer 214r provided in the light emitting element 212, and the green characteristic provided in the photosensor 107. The transmission characteristic Pg of the transmissive film 301g is determined according to the emission spectrum Sg of the green light emitting layer 214g included in the light emitting element 212. It is determined according to the emission spectrum Sb of the layer 214b. Therefore, the spectrum of illumination light can be adjusted accurately.

<2: Electronic equipment>
Next, an electronic apparatus to which the display device 1 is applied will be described.
FIG. 7 shows a configuration of a mobile personal computer to which the display device 1 is applied. The personal computer 2000 includes a display device 1 as a display unit and a main body 2010. The main body 2010 is provided with a power switch 2001 and a keyboard 2002.
FIG. 8 shows a configuration of a mobile phone to which the display device 1 is applied. A cellular phone 3000 includes a display device 1 as a display unit, a plurality of operation buttons 3001, and a scroll button 3002. The screen displayed on the display device 1 is scrolled by operating the scroll button 3002.
FIG. 9 shows a configuration of a portable information terminal (PDA: Personal Digital Assistants) to which the display device 1 is applied. The information portable terminal 4000 includes a display device 1 as a display unit, a plurality of operation buttons 4001, and a power switch 4002. By operating the operation button 4001, various kinds of information such as an address book and a schedule book are displayed on the display device 1.
Note that electronic devices to which the display device 1 is applied include televisions, digital still cameras, video cameras, car navigation devices, electronic notebooks, calculators, video phones, POS terminals, printers, as well as those shown in FIGS. Examples include scanners, copiers, video players, electronic paper, and digital signage (electronic signage / electronic posters).

<3. Modification>
The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. Also, two or more of the following modifications can be combined as appropriate.

[Modification 1]
The optical sensor 107 may be configured to split external light into red light, green light, and blue light using a spectroscope such as a diffraction grating or a prism, and detect the intensity for each color. In addition, the optical sensor 107 is not limited to a mode in which the intensity of external light is detected for each of red light, green light, and blue light, and it is only necessary to be able to detect the spectrum of external light in the visible light region.

[Modification 2]
In the light emitting element 212, the first electrode 215 and the second electrode 213 may be divided into three partial electrodes corresponding to the red light emitting layer 214r, the green light emitting layer 214g, and the blue light emitting layer 214b, respectively. The light emitting element 212 is not limited to an organic EL element, and may be an inorganic EL element. Further, the illumination light emitted from the front light 106 is not necessarily white light. In short, it is only necessary that the spectrum of the illumination light emitted from the front light 106 can be kept constant even if the spectrum of the external light changes.

[Modification 3]
If the area to be irradiated by the front light 106 is extremely small, the light emitting element 212 and the light shielding layer 216 arranged between the first substrate 217 and the second substrate 211 in the front light 106 can be made one each. The object irradiated with the illumination light is not limited to the reflective liquid crystal panel 101 (reflective liquid crystal device), but may be a reflective display device such as electronic paper, or a transmissive display device. May be. Further, the object irradiated with the illumination light may be a posting such as a meter of an audio device, a speed meter of a car, or a poster. Thus, the illuminating device according to the present invention may be a front light that illuminates a meter or a display from the front surface (observer side).

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 101 ... Reflective type liquid crystal panel, FS ... Display surface, 102 ... Display area, 105 ... Control circuit, 106 ... Front light, 107 ... Optical sensor, 108 ... Light control circuit, 201 ... Display board, 202 ... TFT, 203 ... insulating layer, 204 ... pixel electrode, 205 ... liquid crystal, 206 ... common electrode, LC ... liquid crystal element, 207 ... counter substrate, 208 ... light scattering layer, 209 ... polarizing plate, 210 ... resin layer, 211 ... first Two substrates, 212... Light emitting element (organic EL element), 213... Second electrode (213r, 213g, 213b... Partial electrode), 214. Layer), 215 ... first electrode (215r, 215g, 215b ... partial electrode), 216 ... light shielding layer, 217 ... first substrate, 218 ... wiring layer, 219a-219d ... partition wall 301 ... color filter (301r ... red permeable membrane, 301 g ... green permeable membrane, 301b ... blue transmission layer), 302r, 302g, 302b ... photodiode, DAr, DAg, DAb ... detection signal.

Claims (8)

An illumination device for illuminating an object with illumination light,
A transparent first substrate located on the viewer side;
A transparent second substrate facing the first substrate and positioned on the object side;
A light-emitting element that is provided between the first substrate and the second substrate and emits light;
A light shielding layer that is provided between the light emitting element and the first substrate and shields light emitted from the light emitting element toward the first substrate;
The light emitting element includes a light emitting layer formed of a light emitting material, and a first electrode and a second electrode facing each other with the light emitting layer interposed therebetween,
The light emitting layer is divided into a first region that emits red light, a second region that emits green light, and a third region that emits blue light,
At least one of the first electrode and the second electrode includes a first partial electrode provided at a position facing the first region, a second partial electrode provided at a position facing the second region, Divided into a third partial electrode provided at a position facing the third region,
The light emitted from each of the first region, the second region, and the third region, and the external light incident through the first substrate from the observer side are used as the illumination light as the second light. It radiates | emits to the said object side through a board | substrate. The illuminating device characterized by the above-mentioned. Detection means for detecting the spectrum of external light;
And adjusting means for adjusting a light emission amount from each of the first area, the second area, and the third area so that a spectrum of the illumination light is constant based on a detection result of the detection means. The lighting device according to claim 1. 3. The illumination according to claim 2, wherein the adjustment unit adjusts the amount of light emitted from each of the first region, the second region, and the third region so that the illumination light becomes white light. apparatus. The lighting device according to claim 2, wherein the detection unit detects the intensity of each of red light, green light, and blue light included in external light. The detection means includes
A red transmissive film that transmits red light;
A green permeable film that transmits green light;
A blue transmissive film that transmits blue light;
A first light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light transmitted through the red transmission film;
A second light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light transmitted through the green transmission film;
A third light receiving element that outputs a detection signal having a magnitude corresponding to the amount of external light transmitted through the blue transmission film,
The transmission characteristics of the red transmission film are determined according to the spectrum of red light emitted from the first region, and the transmission characteristics of the green transmission film are determined according to the spectrum of green light emitted from the second region. The illuminating device according to claim 4, wherein the transmission characteristics of the blue transmissive film are determined according to a spectrum of blue light emitted from the third region. The lighting device according to claim 1, wherein the light emitting element is an organic electroluminescence element. The lighting device according to any one of claims 1 to 6,
A display unit for displaying an image,
The display device, wherein the second substrate of the lighting device is in contact with a display surface on which an image is displayed in the display unit. An electronic apparatus comprising the display device according to claim 7.

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