JP4600420B2 - Electro-optical device and electronic apparatus - Google Patents

Electro-optical device and electronic apparatus Download PDF

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JP4600420B2
JP4600420B2 JP2007111402A JP2007111402A JP4600420B2 JP 4600420 B2 JP4600420 B2 JP 4600420B2 JP 2007111402 A JP2007111402 A JP 2007111402A JP 2007111402 A JP2007111402 A JP 2007111402A JP 4600420 B2 JP4600420 B2 JP 4600420B2
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JP2007241302A (en
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栄二 神田
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セイコーエプソン株式会社
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Description

  The present invention relates to an electro-optical device provided with a self-luminous element and an electronic apparatus using the same.

2. Description of the Related Art In recent years, an apparatus including an organic light emitting diode element (hereinafter referred to as an OLED element) has attracted attention as an image display apparatus that replaces a liquid crystal display apparatus. An OLED (Organic Light Emitting Diode) element is a current-driven self-luminous element that itself emits light, unlike a liquid crystal element that changes the amount of transmitted light.
In an active matrix driving electro-optical device using an OLED element, a pixel circuit for adjusting a light emission gradation is provided for the OLED element. The setting of the light emission gradation in each pixel circuit is executed by supplying a voltage value or a current value corresponding to the light emission gradation to the pixel circuit and adjusting the drive current flowing through the OLED element.

  As described above, since driving current needs to flow to drive the OLED element, a voltage drop occurs in the power supply wiring from the power supply circuit to the pixel circuit. When the power supply voltage is lowered, the applied voltage of the OLED element is lowered and the light emission luminance is lowered. In order to reduce such a voltage drop due to the routing of the power supply wiring, a power supply wiring shown in FIG. 17 has been proposed (for example, Patent Document 1). According to this technique, the current i is supplied to the pixel circuit from above and below by the wiring L arranged inside the pixel region A.

JP 2002-108252 A

  By the way, from the viewpoint of improving the aperture ratio, the wiring in the pixel region needs to be narrower than the wiring outside the pixel region. For this reason, most of the voltage drop occurs in the wiring in the pixel region. In the conventional wiring structure, the equivalent wiring resistance increases as it approaches the center of the pixel region. For this reason, as shown in FIG. 17, there has been a problem that the luminance of the central portion decreases in the vertical direction.

  SUMMARY An advantage of some aspects of the invention is that it provides an electro-optical device and an electronic apparatus that can display uniform luminance.

  In order to solve the above-described problem, an electro-optical device according to an aspect of the invention includes a pixel region in which a plurality of pixel circuits including self-light-emitting elements are arranged, and at least the pixel region is arranged at an outer peripheral portion of the pixel region. A main power supply line provided over two sides; a plurality of first sub power supply lines connected to one side of the main power supply line and extending in the pixel region; and one side of the main power supply line; A plurality of second sub power supply lines connected to adjacent sides and extending in the pixel region; and at all or part of the intersection of the first sub power supply line and the second sub power supply line, A plurality of sub-power supply connection points connecting the first sub-power supply line and the second sub-power supply line; provided for each of the pixel circuits; at least one of the first sub-power supply line or the second sub-power supply line; A pixel connection point for connecting to a pixel circuit To.

  According to the present invention, the first sub power supply line and the second sub power supply line are arranged in the pixel region, and these are connected via the sub power supply connection point. Can be formed. As a result, it is possible to reduce the resistance of the power supply wiring, and it is possible to drastically improve the luminance unevenness that accompanies the decrease in the power supply voltage. Here, as the self-emitting element, for example, an organic light emitting diode, an inorganic light emitting diode, or the like can be used. In addition, since the main power supply line only needs to be provided over at least two sides of the pixel region, it is not always necessary to surround the pixel region with four sides, as long as the main power supply line is formed along two sides or three sides. Good.

  Here, it is preferable that the main power supply line is provided so as to surround the pixel region, and both ends of the first sub power supply line and the second sub power supply line are connected to the main power supply line. In this case, the resistance of the main power supply line is reduced, and further, the resistance of the first sub power supply line and the second sub power supply line can be reduced, so that the luminance unevenness due to the reduction of the power supply voltage can be further improved. .

  The self-light emitting element includes a plurality of types of elements having different emission colors, and the main power supply line has a plurality of independent main power supply lines according to the light emission color of the self-light emitting element, and the sub power connection It is preferable to provide a point at all or part of the intersection of the first sub power line and the second sub power line connected to the main power line corresponding to the same emission color. In this case, luminance unevenness and color unevenness can be significantly improved in color display.

  The self-light-emitting element includes a plurality of types of elements having different emission colors, and the main power supply line has a voltage value within a predetermined range when displaying white among the self-light-emitting elements having different emission colors. A first main power supply line connected to the common main power supply line at the subpower supply connection point, and an independent main power supply line corresponding to the voltage value outside the predetermined range. Provided at all or part of the intersection of the line and the second sub-power supply line, and provided at all or part of the intersection of the first sub-power supply line and the second sub-power supply line connected to the independent main power supply line. It is preferable. In this case, since the common main power supply line is used, the number of main power supply lines can be reduced. Here, the light emission efficiency includes both the light emission luminance efficiency with respect to the current supplied to the self light emitting element and the light emission luminance efficiency with respect to the voltage applied to the self light emitting element. It may be shared. Further, it is preferable that the predetermined range is a range in which a difference in light emission luminance caused by sharing the main power supply line is visually allowed.

  Also, the sub power connection point is provided at a part of the intersection of the first sub power line and the second sub power line, and the sub power connection point is arranged so as to become denser away from the main power line. It is preferable to do. Since the self-luminous elements are arranged in the pixel region, the line widths of the first sub power line and the second sub power line need to be narrower than the line width of the main power line. Therefore, the power supply impedance viewed from each pixel circuit is greatly influenced by the distance from the pixel circuit to the main power supply line. For this reason, when the sub-power supply connection points are evenly arranged, the power supply impedance in the central portion of the pixel region is higher than that in the outer peripheral portion. According to the present invention, the density of the sub power connection points increases as the distance from the main power line, that is, toward the center of the pixel region, so that the luminance of the entire screen can be made uniform.

  The self-light-emitting elements are composed of elements of the same type with respect to the emission color, and the sub power connection point is provided at all or part of the intersection of the first sub power line and the second sub power line. Is preferred. In this case, the power source impedance can be reduced and the luminance unevenness can be greatly improved. Furthermore, it is preferable that the pixel region includes a color filter or a color conversion layer corresponding to a plurality of regularly arranged colors. In this case, in the electro-optical device for color display, the power supply wiring can be simplified and the luminance unevenness and the color unevenness can be greatly improved.

  The pixel circuits are arranged in a row direction and a column direction in the pixel region, and the first sub power supply line is formed in parallel to the row direction, and is divided into a plurality of wirings in one row. The wirings are preferably connected to the first sub power line of the same color. In this case, since the second sub power line is divided, the aperture ratio can be improved.

  Further, the sub power source connection point is set for each light emission color so that the total area of the sub power source connection points for each light emission color is a proportion corresponding to the current of each light emission color when displaying white. It is preferable to arrange at the intersection of the line and the second sub power line. In this case, when a self-light emitting element having a different light emission efficiency depending on the light emission color is used, the power supply voltage drop can be made closer between the light emission colors, so that the color unevenness can be greatly improved. . Further, in each of the plurality of divided regions obtained by dividing the pixel region, the total area of the sub-power supply connection points for each light emission color is a ratio according to the current of each light emission color when displaying white. It is preferable to arrange a sub power connection point at the intersection of the first sub power line and the second sub power line for each emission color. In this case, since the color unevenness can be improved in the divided area, the color unevenness can be improved even when viewed as the entire screen. Here, the total area of the sub power supply connection points is the sum of the areas of the individual sub power supply connection points. Assuming that the areas of the individual sub-power supply connection points in the same emission color are equal, the total area of the sub-power supply connection points is given by the product of the area of the individual sub-power supply connection points and the number of sub-power supply connection points.

The pixel circuits may be arranged in a row direction and a column direction in the pixel region, and the first sub power line may be formed for each predetermined number of rows in parallel with the row direction. As the number of second sub power supply lines increases, the power supply impedance decreases, but the configuration becomes complicated and the aperture ratio decreases.
According to the present invention, since the second sub power supply line is arranged for every predetermined number of rows, the aperture ratio can be improved in a range where the voltage drop does not cause a problem, and the wiring structure is simplified. Can do.

  The pixel circuits may be arranged in a row direction and a column direction in the pixel region, and the pixel circuits may be arranged so as to be shifted by a predetermined distance in a certain row and the next row. In this case, the pixel circuit can be a so-called delta arrangement.

  Next, it is preferable that the electronic apparatus according to the present invention includes any of the electro-optical devices described above. Examples of the electronic device include a personal computer, a cellular phone, and an information portable terminal.

<1. First Embodiment>
FIG. 1 is a block diagram illustrating a schematic configuration of the electro-optical device according to the first embodiment of the invention. The electro-optical device 1 includes an electro-optical panel AA and an external circuit. In the electro-optical panel AA, a pixel region A, a scanning line driving circuit 100, a data line driving circuit 200, and a temperature sensor 300 are formed. Among these, m scanning lines 101 are formed in the pixel region A in parallel with the X direction. In addition, n data lines 103 are formed in parallel with the Y direction orthogonal to the X direction. A pixel circuit 400 is provided corresponding to each intersection of the scanning line 101 and the data line 103. The pixel circuit 400 includes an OLED element. The symbols “R”, “G”, and “B” shown in the figure indicate the emission color of the OLED element. In this example, pixel circuits 400 for each color are arranged along the data line 103.

  Among the pixel circuits 400, the pixel circuit 400 corresponding to the R color is connected to the main power supply line LR, and the pixel circuit 400 corresponding to the G color is connected to the main power supply line LG, so The corresponding pixel circuit 400 is connected to the main power supply line LB. In the power supply circuit 600, the power supply voltages Vddr, Vddg, and Vddb that generate the power supply voltages Vddr, Vddg, and Vddb are supplied to the pixel circuit 400 corresponding to each color of RGB via the main power supply lines LR, LG, and LB. . In this example, the main power supply lines LR, LG, LB are arranged so as to surround the pixel region A, and the main power supply lines LR, LG, LB and the pixel circuit 400 in the pixel region are connected by the sub power supply line. Yes. Details of the power supply wiring will be described later.

  The scanning line driving circuit 100 generates scanning signals Y1, Y2, Y3,..., Ym for sequentially selecting a plurality of scanning lines 101, and supplies them to the pixel circuits 400, respectively. The scanning signal Y1 is a pulse having a width corresponding to one horizontal scanning period (1H) from the first timing of one vertical scanning period (1F), and is supplied to the scanning line 101 in the first row. Thereafter, the pulses are sequentially shifted and supplied as scanning signals Y2, Y3,..., Ym to the scanning lines 101 in the 2, 3,. Generally, when the scanning signal Yi supplied to the i-th (i is an integer satisfying 1 ≦ i ≦ m) row scanning line 101 becomes H level, this indicates that the scanning line 101 is selected.

  The data line driving circuit 200 supplies supply gradation signals X1, X2, X3,..., Xn to each of the pixel circuits 400 located on the selected scanning line 101. In this example, the supply gradation signals X1 to Xn are given as voltage signals indicating gradation luminance. The timing generation circuit 700 generates various control signals and outputs them to the scanning line driving circuit 100 and the data line driving circuit 200. Further, the image processing circuit 800 generates gradation data D subjected to image processing such as gamma correction, and outputs it to the data line driving circuit 200. In this example, the power supply circuit 600, the timing generation circuit 700, and the image processing circuit 800 are provided outside the electro-optical panel AA. However, some or all of these components may be incorporated into the electro-optical panel AA. Often. Furthermore, some of the components provided in the electro-optical panel AA may be provided as an external circuit.

  Next, the pixel circuit 400 will be described. FIG. 3 shows a circuit diagram of the pixel circuit 400. The pixel circuit 400 shown in the figure corresponds to the R color of the i-th row and is supplied with the power supply voltage Vddr. The pixel circuits 400 corresponding to the other colors are configured similarly except that the power supply voltage Vddg (G color) or the power supply voltage Vddb (B color) is supplied instead of the power supply voltage Vddr. The pixel circuit 400 includes two thin film transistors (hereinafter abbreviated as “TFTs”) 401 and 402, a capacitor element 410, and an OLED element 420. Among these, the source electrode of the p-channel TFT 401 is connected to the main power supply line LR, and the drain electrode thereof is connected to the anode of the OLED element 420. In addition, a capacitor element 410 is provided between the source electrode and the gate electrode of the TFT 401. A gate electrode of the TFT 403 is connected to the scanning line 101, a source electrode thereof is connected to the data line 103, and a drain electrode thereof is connected to the gate electrode of the TFT 401.

  In such a configuration, when the scanning signal Yi becomes H level, the n-channel TFT 402 is turned on, so that the voltage at the connection point Z becomes equal to the voltage Vdata. At this time, a charge corresponding to Vddr−Vdata is accumulated in the capacitor 410. Next, when the scanning signal Yi becomes L level, the TFT 405 is turned off. Since the input impedance at the gate electrode of the TFT 401 is extremely high, the charge accumulation state in the capacitor 410 does not change. The voltage between the gate and source of the TFT 401 is held at the voltage (Vddr−Vdata) when the voltage Vdata is applied. Since the current Ioled flowing in the OLED element 420 is determined by the gate-source voltage of the TFT 401, the current Ioled corresponding to the voltage Vdata flows.

The magnitude of the current Ioled is determined by the gate-source voltage (Vddr−Vdata) of the TFT 401. Therefore, making the power supply voltage Vddr constant in the pixel area A is important for displaying uniform luminance. Therefore, in this embodiment, a wiring structure that can reduce a voltage drop due to the power supply wiring is employed.
FIG. 3 shows a schematic structure of the power supply wiring. The power supply lines include main power supply lines LR, LG, and LB arranged so as to surround the pixel region A, first sub power supply lines Lr1, Lg1, and Lb1, second sub power supply lines Lr2, Lg2, and Lb2. including. The main power supply lines LR, LG, and LB are provided corresponding to the respective emission colors of the OLED element 420. The main power supply line is provided for each emission color for the following reason. First, since the light emission efficiency of the OLED element 420 is different for each light emission color, it is desirable to set the line widths of the main power supply lines LR, LG, and LB according to the light emission efficiency. That is, since the voltage drop changes depending on the amount of current, the line width is set in accordance with the light emission efficiency to make the voltage drop uniform. Second, since the light emission efficiency of the OLED element 420 is different for each emission color, it is necessary to supply different power supply voltages.

  Next, the first sub power supply lines Lr1, Lg1, and Lb1 have one end connected to one side of the main power supply lines LR, LG, and LB and extended into the pixel region A, and the other end connected to the one side. Connected to the opposite side. The first sub power supply lines Lr1, Lg1, and Lb1 are interconnects parallel to the row direction. On the other hand, the second sub power supply lines Lr2, Lg2, and Lb2 have one end connected to the side adjacent to the one side of the main power supply lines LR, LG, and LB, and are extended inside the pixel region A. An end is connected to a side facing the adjacent side. The second sub power supply lines Lr2, Lg2, and Lb2 are wirings parallel to the column direction. The first sub power lines Lr1, Lg1, and Lb1, and the second sub power lines Lr2, Lg2, and Lb2 are provided according to the types of the main power lines LR, LG, and LB, respectively. As a result, the power supply wiring is formed in a mesh shape inside the pixel region A.

FIG. 4 shows a detailed structure of the power supply wiring. The first sub-power supply lines Lr1, Lg1, and Lb1 and the second sub-power supply lines Lr2, Lg2, and Lb2 intersect in the pixel region, but those connected to the same main power supply line are sub-power supply connection points P. Connected with. Specifically, the first sub power supply line Lr1 and the second sub power supply line Lr2, the first sub power supply line Lg1 and the second sub power supply line Lg2, and the first sub power supply line Lb1 and the second sub power supply line Lb2 are respectively connected. The In this example, each pixel circuit 400 and the second sub power supply lines Lr2, Lg2, and Lb2 are connected at a pixel connection point Q (white circle in the drawing). The pixel connection point Q may be provided on at least one of the first sub power supply lines Lr1, Lg1, and Lb1, or the second sub power supply lines Lr2, Lg2, and Lb2.
Thus, by providing the mesh-like power supply wiring inside the pixel basin A, the wiring resistance can be greatly reduced. As a result, the power supply voltages Vddr, Vddg, and Vddb can be uniformly supplied to each pixel circuit 400, and luminance unevenness and color unevenness can be significantly improved.

<2. Second Embodiment>
Next, the electro-optical device 1 according to the second embodiment will be described. The electro-optical device 1 of the second embodiment is configured in the same manner as the electro-optical device 1 of the first embodiment, except that the same power supply voltage is used for the R and B colors and the power supply wiring is shared. . The electro-optical device 1 according to the first embodiment is based on the premise that the light emission efficiency of the OLED element 420 differs depending on each light emission color, but the light emission color differs depending on the type of organic EL material used for the light emitting layer. However, there are some that have similar luminous efficiencies. The electro-optical device 1 according to the second embodiment uses, for example, an OLED element 420 whose light emission efficiency is approximated for R and B colors. Combinations of colors that have similar voltage values when displaying white are combined. For example, when the voltages required to obtain the luminance required for displaying white are Vr and Vb for the R and B colors, the difference between Vr and Vb is within the range of −2V. Then visually acceptable. The light emission efficiency of the OLED element 420 can be grasped from two viewpoints: the relationship between the drive current flowing through the OLED element 420 and the light emission luminance, and the relationship between the applied voltage of the OLED element 420 and the light emission luminance.

  FIG. 5 shows a detailed structure of the power supply wiring. First, the main power supply line includes a common main power supply line LRB common to the R color and the B color, and a main power supply line LG corresponding to only the G color (hereinafter referred to as an independent main power supply line). The common main power supply line LRB is supplied with a power supply voltage Vddrb common to the R and B colors from a power supply circuit 600 (not shown). The common use of the main power supply line is only required for OLED elements having different emission colors and having a light emission efficiency within a predetermined range, and the difference in light emission luminance caused by the common use of the main power supply line is visually recognized. It is preferable that the range is acceptable. That is, the voltage value required to obtain the brightness when displaying white is substantially equal between the emission colors. For example, if the voltage value is within a range of 10%, it is visually acceptable.

The width of the independent power supply line LG is W1, the width of the common power supply line LRB is W2, the current of the G-color OLED element at the same luminance is I1, the current of the R-color OLED element is I2r, and the current of the B-color OLED element Is I2b, the ratio of W1 and W2 is given by the following equation.
W1 / W2 = I1 / (I2r + I2b)
In this way, by setting the line width, it is possible to equalize the voltage drop between the emission colors and improve the color unevenness.

In addition, Lrb1 and Lg1 are employed for the first sub power line in this example. The first sub power supply line Lrb1 is connected through the sub power supply connection point P at the intersection of the second sub power supply lines Lr2 and Lb2. Also in the second embodiment, as in the first embodiment, three types corresponding to each color of RGB can be used as the second sub power supply line. The power supply line Lrb1 is employed.
Thus, by sharing the main power supply line, it is possible to simplify the wiring structure, increase the number of sub power supply connection points P, and supply the power supply voltage more uniformly. As a result, luminance unevenness can be significantly improved.

<3. Third Embodiment>
Next, the electro-optical device 1 according to the third embodiment will be described. The electro-optical device 1 according to the third embodiment is different from the electro-optical device 1 according to the first embodiment in that a monochromatic OLED element is used. FIG. 6 shows a detailed structure of the power supply wiring. In this case, since one type of power supply voltage is sufficient, the main power supply line is only LW as shown in the figure. Further, the sub power connection points P are provided at all the locations corresponding to the intersections of the first sub power line Lw1 and the second sub power line Lw2. That is, by arranging the first sub power supply line Lw1 and the second sub power supply line Lw2 in a grid and connecting them at their intersections, the power supply impedance is greatly reduced. Accordingly, a uniform power supply voltage can be supplied to each pixel circuit 400.

  However, the power supply impedance viewed from each pixel circuit 400 is determined according to the distance from the imager circuit 400 to the main power supply line LW. For this reason, the power supply impedance seen from the pixel circuit 400 located at the center of the pixel region A is larger than the power supply impedance seen from the pixel circuit 400 located at the center of the pixel region A. Therefore, the density of the sub power connection points P may be set higher toward the center of the pixel region A so that the power source impedances viewed from each pixel circuit 400 are equal. In this case, as compared with the case where the sub-power supply connection points P are arranged at all the intersections, the power supply impedance becomes high, but the voltage drop can be made uniform, so that the luminance unevenness can be further eliminated.

  Further, a color display may be performed by combining a color filter and a single color OLED element. FIG. 7 shows a detailed structure of the power supply wiring when the color filter and the monochromatic OLED element are combined. In the figure, “WR” indicates a pixel to which an R color filter is applied, “WG” indicates a pixel to which a G color filter is applied, and “WB” indicates a pixel to which a B color filter is applied. In this case, luminance unevenness can be eliminated in color display. In the electro-optical device 1 according to the first embodiment described above, the OLED elements 420 having different emission colors are used for color display. For this reason, it is necessary to form three types of main power supply lines such as LR, LG, and LB, and to form three types of first sub power supply lines and second sub power supply lines accordingly. In particular, since the first sub power supply line and the second sub power supply line intersect within the pixel region A, they need to have a stacked structure with an insulating layer interposed therebetween. On the other hand, when the color filter and the monochromatic OLED element are combined, the first sub power supply line Lwl, the second sub power supply line Lw2, and the sub power supply connection point P can be formed at the same time, so that the manufacturing process can be greatly simplified. . In addition, you may provide the color conversion layer which can convert not only a color filter but a color.

<4. Fourth Embodiment>
Next, the electro-optical device 1 according to the fourth embodiment will be described. The electro-optical device 1 of the fourth embodiment is configured in the same manner as the electro-optical device 1 of the first embodiment, except for the detailed wiring structure of the first sub power supply lines Lr1, Lg1, and Lb1. FIG. 8 shows a detailed structure of the power supply wiring. As shown in this figure, the first sub power supply lines L11, L12, L13,... Formed along the row direction are divided in the middle. For example, the first sub power supply line L11 in the first row connects the main power supply line LR and the second sub power supply line Lr2 in the first column, is divided between the R pixel and the G pixel, and the second column. The second sub power supply line Lg2 and the second sub power supply line Lg2 in the fifth column are connected to each other and divided between the G pixel and the B pixel. Further, the first sub power line L11 in the first row is divided between the B pixel and the R pixel (not shown), and the same pattern is repeated in the same manner.

That is, the first sub power line L11 is adjacent to the R sub line LLR that connects the R main power line LR and the second sub power line Lr2 (first column) and the second sub power line Lr2 (first column). Next, the G wiring LLG for connecting the G second sub power supply line Lg2 to the next second sub power supply line Lg2, the B second sub power supply line Lb2 adjacent to the next second sub power supply line Lg2, and the next B wiring LLB for connecting to the second sub power supply line Lb2, and similarly for R wiring LLR → (dividing) → G wiring LLG → (dividing) → B wiring LLB → (dividing) → R The wiring LLR is repeated. This also applies to the other first sub power supply lines L12, L13,. That is, the first sub power supply line is formed in parallel with the row direction, and is divided into a plurality of wirings in one row, and each wiring is used for connecting the second sub power supply lines of the same color.
As described above, since the first sub power supply lines L11, L12, L13,... Are divided, it is possible to eliminate the power supply lines in the row direction in the divided pixel circuit 400, and to allocate the area to the area of the OLED element 429. it can. As a result, the aperture ratio can be improved.

<5. Fifth Embodiment>
Next, an electro-optical device 1 according to a fifth embodiment will be described. The electro-optical device 1 according to the fifth embodiment is configured in the same manner as the electro-optical device 1 according to the first embodiment except for the arrangement of the sub-power supply connection point P. In this example, it is assumed that the light emission efficiency of the G-color OLED element 420 is twice the light emission efficiency of the B color and the R color.

  FIG. 9 shows the detailed structure of the power supply wiring. Here, the ratio of arranging the sub power connection point P to the second sub power lines Lr2, Lg2, and Lb2 is set according to the light emission efficiency of the OLED element. A range surrounded by a dotted line in the drawing shows a basic arrangement pattern of the sub-power supply connection points P, and the sub-power supply connection points P are arranged in the other regions as well as this arrangement pattern. First, in the range surrounded by the dotted line, when attention is paid to the second sub power supply line Lg2, one sub power connection point P is arranged. Further, two sub power connection points P are arranged in the second sub power lines Lr2 and Lb2. As the number of sub power connection points P increases, the power impedance decreases. In this example, the ratio of the number of G-color sub-power supply connection points P to the number of R-color sub-power supply connection points P is 1: 2, which is set to be inversely proportional to the light emission efficiency. Since the luminous efficiency is double, the current amount is halved at the same luminance. Therefore, the voltage drop variation can be eliminated between the emission colors.

In other words, the sub-power supply connection point P in the predetermined range of the pixel area A is arranged so that the wiring resistance becomes equal according to the light emission efficiency. And it repeats the arrangement pattern of the predetermined range also about another area | region. Thus, according to the wiring structure, color unevenness can be significantly improved.
Here, in each of the above, the sub power connection point P is set for each light emission color so that the total area of the sub power connection point P for each light emission color becomes a proportion corresponding to the current of each light emission color when displaying white. It is preferable to arrange. In this case, since the color unevenness can be improved in the divided area, the color unevenness can be improved even when viewed as the entire screen. Here, the total area of the sub power connection points P is the sum of the areas of the individual sub power connection points P. Assuming that the areas of the individual sub-power supply connection points P in the same emission color are equal, the total area of the sub-power supply connection points P is the product of the area of the individual sub-power supply connection points P and the number of sub-power supply connection points P. Given.

<6. Sixth Embodiment>
Next, the electro-optical device 1 according to the sixth embodiment will be described. The electro-optical device 1 according to the sixth embodiment is configured in the same manner as the electro-optical device 1 according to the first embodiment except for the arrangement of the sub-power supply connection point P. FIG. 10 shows the detailed structure of the power supply wiring. In this example, the second sub power supply lines Lr2, Lg2, and Lb2 are not provided for the third to fifth rows of the pixel region A. That is, the second sub power supply lines Lr2, Lg2, and Lb2 are not provided for all of the pixel regions A, but the second sub power supply lines Lr2, Lg2, and the like are arranged every n (three in this example) pixel circuits 400. Lb2 is formed. From the viewpoint of reducing the power supply impedance, it is better that the number of the second sub power supply lines Lr2, Lg2, and Lb2 is larger. However, the second sub power supply lines Lr2, Lg2, and Lb2 may be thinned out as long as the voltage drop does not cause a problem.

However, if the second sub power supply lines Lr2, Lg2, and Lb2 are thinned out intensively in a certain region (for example, the center in the vertical direction), the power source impedance becomes high in that region, and luminance unevenness may occur. Therefore, it is desirable to thin out the second sub power supply lines Lr2, Lg2, and Lb2 uniformly over the entire pixel region A. In other words, it is preferable that a range surrounded by a dotted line in the figure is a basic wiring pattern and a wiring structure in which this is repeated.
According to the present embodiment, since the second sub power supply lines Lr2, Lg2, and Lb2 can be thinned out in a range where the voltage drop does not cause a problem, the aperture ratio can be improved and the wiring structure can be simplified. Can be.

<7. Modification>
(1) In the first to sixth embodiments described above, the RGB pixel circuits 400 are arranged in the column direction as an example. However, the present invention is not limited to this, and the RBG color circuit is not limited thereto. The wiring structures of the first to sixth embodiments described above can be applied to a pixel circuit 400 having a delta arrangement.
FIG. 11 shows a configuration example in which the wiring structure of the first embodiment is applied to a pixel circuit having a delta arrangement. As shown in this figure, the pixel circuits 400 in the delta arrangement are arranged with a ½ pitch shift in the row direction between a certain row and the next row. Then, the first sub power supply lines Lb 1, Lg 1, and Lb 1 are routed in the vertical direction so as to pass between the pixel circuits 400. Since the other points are the same as in the first embodiment, the wiring resistance can be greatly reduced. As a result, the power supply voltages Vddr, Vddg, and Vddb can be uniformly supplied to each pixel circuit 400, and luminance unevenness can be significantly improved.

  (2) In the first to sixth embodiments and the modifications described above, the main power supply lines LR, LB, and LG are formed so as to surround the pixel region A, but the present invention is not limited to this. For example, as shown in FIG. 12, the main power supply lines LR, LB, and LG may be formed along the three sides of the pixel region A, or on the three sides of the pixel region A as shown in FIG. The main power supply lines LR, LB, and LG may be formed along the lines. Even in these cases, the first sub-power supply lines Lr1, Lg1, and Lb1 and the second sub-power supply lines Lr2, Lg2, and Lb2 can be formed in a mesh shape inside the pixel region A.

<8. Electronic equipment>
Next, an electronic apparatus to which the electro-optical device 1 according to the first to sixth embodiments and the modifications described above is applied will be described. FIG. 14 shows a configuration of a mobile personal computer to which the electro-optical device 1 is applied. The personal computer 2000 includes the electro-optical 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. Since the electro-optical device 1 uses the OLED element 420, it is possible to display an easy-to-see screen with a wide viewing angle.

FIG. 15 shows a configuration of a mobile phone to which the electro-optical device 1 is applied. A cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the electro-optical device 1 as a display unit. By operating the scroll button 3002, the screen displayed on the electro-optical device 1 is scrolled.
FIG. 16 shows a configuration of a portable information terminal (PDA: Personal Digital Assistants) to which the electro-optical device 1 is applied. The information portable terminal 4000 includes a plurality of operation buttons 3001, a power switch 4002, and the electro-optical device 1 as a display unit. When the power switch 4002 is operated, various types of information such as an address book and a schedule book are displayed on the electro-optical device 1.

  Note that electronic devices to which the electro-optical device 1 is applied include those shown in FIGS. 14 to 16, a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, and an electronic device. Examples include a notebook, a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. The electro-optical device 1 described above can be applied as a display unit of these various electronic devices.

1 is a block diagram illustrating a configuration of an electro-optical device according to a first embodiment of the invention. FIG. It is a circuit diagram which shows the structure of the pixel circuit in the same apparatus. It is a figure which shows schematic structure of the power supply wiring in the apparatus. It is a figure which shows the detailed structure of the power supply wiring in the same apparatus. FIG. 6 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a second embodiment of the invention. FIG. 10 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a third embodiment of the invention. FIG. 10 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a modification of the third embodiment. FIG. 9 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a fourth embodiment of the invention. FIG. 10 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a fifth embodiment of the invention. FIG. 10 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a sixth embodiment of the invention. FIG. 9 is a diagram illustrating a detailed configuration of power supply wiring in an electro-optical device according to a modification of the invention. FIG. 10 is a diagram illustrating a configuration example of a main power supply line in an electro-optical device according to a modified example of the invention. FIG. 10 is a diagram illustrating another configuration example of a main power supply line in an electro-optical device according to a modified example of the invention. FIG. 3 is a perspective view illustrating a configuration of a mobile personal computer to which the electro-optical device is applied. It is a perspective view which shows the structure of the mobile telephone to which the same electro-optical apparatus is applied. It is a perspective view which shows the structure of the portable information terminal to which the same electro-optical device is applied. It is a figure which shows the structural example of the conventional power supply wiring.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electro-optical device, LR, LG, LB ... Main power supply line, Lr1, Lg1, Lb1 ... First sub power supply line, Lr2, Lg2, Lb2 ... Second sub power supply line, P ... Sub power supply connection point, Q ... Pixel Connection point.

Claims (7)

  1. In an electro-optical device including a pixel region in which a plurality of pixel circuits including self-luminous elements are arranged,
    A main power supply line provided on at least two sides of the pixel region at the outer periphery of the pixel region;
    A plurality of first sub power supply lines connected to one side of the main power supply line and extending in the pixel region;
    A plurality of second sub power supply lines connected to one side of the main power supply line and adjacent to the side, and extending in the pixel region;
    A plurality of sub-power connection points connecting the first sub-power line and the second sub-power line at all or part of the intersection of the first sub-power line and the second sub-power line;
    A pixel connection point that is provided for each pixel circuit and connects at least one of the first sub power supply wiring or the second sub power supply wiring and the pixel circuit ;
    The sub power connection point is provided at a part of the intersection of the first sub power line and the second sub power line, and the sub power connection point is arranged so as to become denser as the distance from the main power line increases. An electro-optical device.
  2. The self-light-emitting element includes a plurality of types of elements having different emission colors, and the main power supply line has a plurality of independent main power supply lines according to the light emission color of the self-light-emitting element,
    The sub power supply connection point is provided at all or part of an intersection of the first sub power supply line and the second sub power supply line connected to the main power supply line corresponding to the same emission color. The electro-optical device according to Item 1.
  3. The self-luminous element is composed of the same type of element with respect to the emission color,
    The electro-optical device according to claim 1, wherein the sub power connection point is provided at all or a part of an intersection of the first sub power line and the second sub power line.
  4. The electro-optical device according to claim 3 , further comprising a color filter or a color conversion layer corresponding to a plurality of regularly arranged colors in the pixel region.
  5. The pixel circuits are arranged in a row direction and a column direction in the pixel region,
    The electro-optical device according to claim 2 , wherein the first sub power supply line is formed for each predetermined number of rows in parallel with the row direction.
  6. The pixel circuit according to claim 1 to 5, characterized in that are arranged in a row direction and a column direction, the pixel circuits in one row and the next row is arranged offset by a predetermined distance in the pixel region The electro-optical device according to claim 1.
  7. An electronic apparatus comprising the electro-optical device according to any one of claims 1 to 6.
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JP5096103B2 (en) 2007-10-19 2012-12-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニーGlobal Oled Technology Llc. Display device
KR101246769B1 (en) * 2008-03-31 2013-03-26 샤프 가부시키가이샤 Planar light emission type display device
KR101113451B1 (en) * 2009-12-01 2012-02-29 삼성모바일디스플레이주식회사 Organic Light Emitting Display device

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