JP2003122306A - Active matrix type display device and active matrix type organic electroluminescence display device - Google Patents

Active matrix type display device and active matrix type organic electroluminescence display device

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Publication number
JP2003122306A
JP2003122306A JP2001312322A JP2001312322A JP2003122306A JP 2003122306 A JP2003122306 A JP 2003122306A JP 2001312322 A JP2001312322 A JP 2001312322A JP 2001312322 A JP2001312322 A JP 2001312322A JP 2003122306 A JP2003122306 A JP 2003122306A
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JP
Japan
Prior art keywords
pixels
pixel
pixel circuit
luminance information
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001312322A
Other languages
Japanese (ja)
Inventor
Akira Yumoto
昭 湯本
Original Assignee
Sony Corp
ソニー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp, ソニー株式会社 filed Critical Sony Corp
Priority to JP2001312322A priority Critical patent/JP2003122306A/en
Publication of JP2003122306A publication Critical patent/JP2003122306A/en
Application status is Pending legal-status Critical

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Abstract

(57) [Problem] To provide a pixel circuit having a function of compensating variation in characteristics of a TFT, the number of elements is larger than that of a basic pixel circuit of a voltage writing type. SOLUTION: In the active matrix type organic EL display device, the organic EL display device includes two TFTs 21 and 23 and one capacitor 22, and supplies a current corresponding to luminance information to the organic EL device.
The pixel circuit that flows through the element is composed of two pixels vertically adjacent to each other.
The pixel circuits are provided in common to the L elements 11A and 11B, and the organic EL elements 11A and 11B are appropriately selected by the selection TFTs 15A and 15B so that the pixel circuits are vertically adjacent to each other.
The pixels are shared in a time-sharing manner, and the number of elements of the pixel circuit per pixel is reduced.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active element for each pixel.
Display control for each pixel by the active element.
Regarding the active matrix type display device to be performed,
In addition, an electro-optical element whose brightness changes according to the flowing current
Active matrix table used as a pixel display element
Of organic materials as display devices and electro-optical elements
Luminescence (hereinafter, organic EL (electroluminescence)
Active matrix type organic EL using element)
It relates to a display device. 2. Description of the Related Art As a display device, for example, a display element of a pixel
In a liquid crystal display device using a liquid crystal cell, a large number of
The pixels are arranged in a matrix and correspond to the image information to be displayed.
Image display by controlling the light intensity for each pixel
Driving is performed. This display drive is
Organic EL display using organic EL elements as element display elements
The same applies to devices. However, in the case of an organic EL display device, an image
So-called self-luminous, which uses light emitting elements as element display elements
Because it is a display device of the type, the image
High visibility, no backlight required, fast response speed, etc.
Has the advantage of Also, the brightness of each light emitting element
That is, the organic EL element
The liquid crystal cell is voltage-controlled in that it is controlled
It is significantly different from liquid crystal display devices and the like. In an organic EL display device, a liquid crystal display device is used.
Like the device, the driving method is simple (passive)
Rix method and active matrix method can be adopted
it can. However, although the former has a simple structure,
And it is difficult to realize a high-definition display.
is there. For this reason, in recent years, the electric current
The current is applied to an active element (generally thin
Thin Film Transistor (TFT)
Active matrix system development
Is being done. FIG. 8 shows an active matrix type organic EL.
Pixel circuit of voltage writing type in display device (unit pixel
(Shown in more detail in U.S. Pat.
5,684,365, JP-A-8-234683
Gazette). The pixel circuit according to this circuit example is clearly shown in FIG.
Organic EL with cathode (cathode) grounded
Element 101 and anode (anode) of organic EL element 101
Is connected to the drain, and the source is connected to the positive power supply Vcc.
TFT 102, the gate of the TFT 102 and the positive power supply V
cc and a capacitor 103 connected between the
02 has a drain at the gate and a source at the data line 105.
And TFT 104 connected to each other.
Scan pulse is applied to the gate of
Configuration. Here, the organic EL element is often rectifying
OLED (Organic Light Emitting Diode)
Sometimes called. Therefore, FIG.
In the figure, a diode symbol is used as the organic EL element.
Is shown. However, in the following description, the organic EL
The element does not necessarily require rectification. The operation of the pixel circuit having the above configuration is as follows.
You. First, the potential of the scanning line 106 is selected (here,
High level) and the write potential Vw is applied to the data line 105.
When the voltage is applied, the TFT 104 conducts and the capacitor 103
Is charged or discharged, and the gate potential of the TFT 102 is written.
It becomes the potential Vw. Next, the potential of the scanning line 106 is
When in the selected state (here, low level), the scanning line 10
6 and the TFT 102 are electrically separated from each other.
The gate potential of 102 is stabilized by the capacitor 103
Will be retained. The TFT 102 and the organic EL element
The current flowing in 101 is the gate / source of TFT102.
It becomes a value corresponding to the inter-voltage Vgs, and the organic EL element 101
Light emission continues at a luminance corresponding to the current value. Where the scan
The line 106 is selected, and the luminance information given to the data line 105 is selected.
The operation of transmitting information to the inside of the pixel is hereinafter referred to as “writing”.
I will do it. As described above, in the pixel circuit shown in FIG.
Is that once the potential Vw is written,
Until the operation is performed, the organic EL element 101 has a constant brightness.
Continue to emit light. Such a pixel circuit (hereinafter simply referred to as a pixel)
111) in a matrix as shown in FIG.
Scan lines 112-1 to 112n are driven by scanning lines
The voltage driving type data is sequentially selected by the circuit 113.
Data line 115-1 to data line 115-1
By repeatedly writing through -m,
Construct a matrix display (organic EL display)
Can be Here, a pixel array of n rows × m columns is shown.
are doing. In this case, of course, the scanning line is n
And m data lines. In the simple matrix type display device, each light emitting element
The child emits light only at the selected moment, while the
The active matrix display device emits light even after writing is completed.
The device continues to emit light. For this reason, active matrix
Type display devices are more developed than simple matrix type display devices.
Points such as lowering peak luminance and peak current of optical element
This is particularly advantageous for large, high-definition displays.
You. By the way, active matrix type organic E
In the L display device, glass is generally used as an active element.
Insulated gate thin film field effect transistor formed on substrate
A star (TFT) is used. However, this TFT
Amorphous silicon (amorphous silicon)
) And polysilicon (polycrystalline silicon)
Poor crystallinity and poor control of conductive mechanism
Therefore, the characteristics of the formed TFT vary greatly.
Is well known. In particular, a policy is applied on a relatively large glass substrate.
When forming a recon TFT, thermal deformation of the glass substrate
In order to avoid problems such as
After formation, crystallization is performed by laser annealing.
You. However, laser etching is evenly applied to a large glass substrate.
It is difficult to irradiate energy, polysilicon crystal
That the state of formation varies depending on the location in the substrate
Is inevitable. As a result, the TF formed on the same substrate
Even at T, the threshold voltage Vth is several hundred mV depending on the pixel,
In some cases, it is not unusual that the voltage fluctuates by 1 V or more. In this case, for example, the same is applied to different pixels.
Even if the potential Vw is written, the threshold voltage of the TFT depends on the pixel.
The pressure Vth will vary. With this, organic EL
The current Ids flowing through the element varies greatly from pixel to pixel,
Result will be out of the desired value,
You cannot expect high image quality. This is the threshold
Not only the value voltage Vth but also the carrier mobility μ
The same can be said for turbulence. In order to improve such a problem, conventionally,
Have been proposed. One of them
Of the pixel circuit according to the conventional example (hereinafter referred to as Conventional Example 1)
An example of a road is shown in FIG. The pixel circuit according to the conventional example 1 is similar to the pixel circuit shown in FIG.
As can be seen, the organic EL element with the cathode grounded
121 and a drain on the anode of the organic EL element 121
Connected to the connected TFT122 and the source of the TFT122.
Rain is connected, source is connected to positive power supply Vcc
Between the TFT 123 and the gate and drain of the TFT 123
TFT 124 connected between the gate of the TFT 123
125, one end of which is connected to
25 connected between the other end of the power supply 25 and the positive power supply Vcc.
Drain at the other end of the capacitor 126 and the capacitor 125.
TFTs 12 whose sources are connected to data lines 128, respectively.
7 and the scanning line 129 passes through the gate of the TFT 127.
The scanning pulse is applied to the gate of the TFT 122 by the drive line 13.
0, the drive pulse is reset to the gate of the TFT 124.
Configuration in which a reset pulse is applied through the reset line 131
It has become. Subsequently, the pixel circuit according to the conventional example 1 having the above-described configuration is used.
For the circuit operation of the road, see the timing chart of FIG.
It will be described using FIG. First, before writing data, scan lines
129 and the reset line 131 in the selected state (both high level).
TF) for driving by the switching TFT 124.
The gate and drain of T123 are short-circuited. Next, drive
When the line 130 is in the non-selected state (high level), the driving T
A switch interposed between the FT 123 and the organic EL element 121
The switching TFT 122 is turned off. With this,
The drain potential of the driving TFT 123 increases. On the other hand, the switching TFT 124 is turned on.
Between the gate and drain of the driving TFT 123.
The gate potential also rises because of the short circuit,
When this becomes Vcc- | Vtp |, a stable state is established.
(This may be hereinafter referred to as a reset state). here
And | Vtp | is the absolute value of the threshold voltage of the driving TFT 123.
Value. When the reset operation is completed, the reset line 13
1 is not selected (low level), and the data line 128
A voltage corresponding to the degree information is applied. The potential of the data line 128 is shown in FIG.
Thus, during the reset operation, the reference potential is constant,
After the reset operation, the voltage drops by the voltage ΔV. Running in that state
By setting the scanning line 129 to the non-selection state, writing to the pixel
The writing operation is completed. Data line 128 and driving transformer
The gate of the transistor 123 is
The data line 128 is driven for driving
Without being transmitted directly to the gate of TFT 123,
The potential change ΔV of the data line 128 is transmitted. Then drive
When the flow line 130 is in the selected state (low level), writing is performed.
The current corresponding to the input data passes through the switching TFT 122.
Then, it flows to the organic EL element 121. Thereby, the organic E
The L element 121 emits light at a luminance according to the written data.
Light. By the way, the driving TFT 123 is in a saturation region.
Assuming that the operation is performed by the
The current Ids is given by the well-known MOS transistor equation.
Therefore, it is expressed as in equation (1). Ids = μCox · W / L / 2 (Vcc−Vg− | Vtp |) Two (1) where μ is the carrier mobility and Cox is the unit area.
, W is the channel width, and L is the channel length.
You. The gate potential Vg is controlled by the reset operation described above.
Therefore, immediately before data writing, Vcc− | Vtp
, Vg = Vcc− | Vtp | −ΔV (2) immediately after the end of writing. By substituting this into equation (1), Ids = μCox · W / L / 2 · ΔV Two ... (3) is obtained. Since equation (3) does not include Vtp,
The current Ids flowing through the driving TFT 123 is equal to the threshold voltage Vt.
It turns out that it is not affected by the variation of p. Another conventional example (hereinafter, referred to as conventional example 2) will be described.
Current-writing type pixel shown in FIG.
The circuit has been proposed by the inventor of the present application (in detail
For details, see International Publication No. WO01-06484.
See). The pixel circuit according to the conventional example 2 is similar to the pixel circuit shown in FIG.
As can be seen, the organic EL element with the cathode grounded
141 and the drain of the anode of the organic EL element 141
TFT1 which is connected and whose source is connected to the positive power supply Vcc
42 between the gate of the TFT 142 and the ground.
The connected capacitor 143 and the gate of the TFT 142
And a TFT 144 having a drain connected to the
Is connected to the gate and drain, and the positive power supply V
a TFT 145 having a source connected to cc;
5 between the gate / drain and the data line 147.
TFT 146, and each of TFTs 144 and 146
A scan pulse is applied to the gate through the scan line 148
It has a configuration. The pixel circuit according to the conventional example 2 is shown in FIGS.
In each pixel circuit shown in FIG. 10, luminance data is given in the form of a voltage.
Brightness data is provided in the form of current
This is a major feature. The operation is as follows. First, when writing luminance data, scanning is performed.
The line 148 is set to the selected state (high level), and the data line 147 is set.
A write current Iw corresponding to the luminance data. This book
The writing current Iw is supplied to the TFT 145 through the TFT 146.
Flows to At this time, the TFT 144 must be in the ON state.
Therefore, the TFT 142 and the TFT 145 are connected to the current mirror.
-Form a circuit. Here, both transistors 142, 1
45 is close to the inside of a small pixel,
It has one characteristic. As a result, the write voltage is applied to the TFT 142.
A drive current Id proportional to the flow Iw flows. Drive current Id
Between the TFT 142 and the TFT 1
Set the ratio of channel width / channel length to 45 appropriately.
And the TFTs 142 and 14
Affects the threshold voltage of 5 and the carrier mobility value itself
Threshold voltage across the entire screen (all pixel areas)
Irrespective of the variation in carrier mobility
The organic EL element 141 of each pixel can emit light.
is there. [0028] From the above, it is apparent that
It has a function to compensate for variations in TFT characteristics.
The pixel circuit, that is, the pixel circuit according to Conventional Example 1 shown in FIG.
Alternatively, in the pixel circuit according to Conventional Example 2 shown in FIG.
Irrespective of the variation in the threshold voltage of T and the mobility of carriers,
The light-emitting element of each pixel can emit light at a desired luminance.
8 on the other hand, on the other hand,
Element compared to the basic pixel circuit of voltage writing type shown in
The disadvantage is that the number increases. That is, in the case of the pixel circuit shown in FIG.
While FIG. 10 and FIG.
In the case of each pixel circuit shown in FIG. 12, four transistors are used.
Required in the pixel circuit of FIG.
The number also increases by one. Poor image quality due to variation in TFT characteristics
As a countermeasure for the pixel circuit, besides the pixel circuits shown in FIGS. 10 and 12
Pixel circuits with various circuit ideas have been proposed.
However, in each case, the number of elements is inevitable. like this
If the number of elements of the pixel circuit per pixel is large,
Deterioration is likely to occur, and it is difficult to reduce the pixel area
The pixel pitch must be large,
This hinders resolution enhancement. The present invention has been made in view of the above problems.
The purpose is to set the pixel per pixel
By reducing the number of circuit elements, the production yield
Above, further reduction in pixel area, resulting in higher resolution
Active matrix display device and
To provide an active matrix type organic EL display device
It is in. An active device according to the present invention is provided.
In a matrix type display device, the luminance changes depending on the flowing current.
Pixels with electro-optical elements to be arranged are arranged in a matrix
Are provided in common for a plurality of pixels,
Current corresponding to the luminance information given through the
A pixel circuit flowing through each electro-optical element of the pixel, and a plurality of pixels
From inside, the electro-optical element of the pixel to be driven by the pixel circuit
And selecting means for selecting. Also,
This display device uses an organic EL element as an electro-optical element.
Applied to active matrix organic EL displays
It is. The active matrix type display device having the above configuration
Or an active matrix organic EL display
The pixel circuit is shared by a plurality of pixels,
The driving circuit is driven by the selection means from among the pixels.
Electro-optical element or organic
The luminance information given to the EL element through the data line
Apply the current according to the report. Here, the pixel circuit is divided into a plurality of pixels.
The number of pixel circuit elements per pixel
Can be reduced. Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. [First Embodiment] FIG. 1 shows a first embodiment of the present invention.
The configuration of the active matrix type display device according to the embodiment
It is a block diagram shown. In FIG. 1, each pixel is provided with
As a light-emitting element, the brightness changes with the flowing current.
Electro-optical element such as an organic EL element 11 (11A, 1A).
1B) is used, and the organic EL element 11 is a pixel.
The units are arranged in a matrix (matrix). here
Here, a pixel array of 2n rows × m columns is shown as an example.
You. In this pixel arrangement, a plurality of pixels, for example,
Each of the organic EL elements 11A and 11 of two pixels vertically adjacent to each other
A pixel circuit 12 that supplies a current corresponding to the luminance information to B
Are provided in common. That is, one pixel circuit 1
2, the organic EL elements 11A for two pixels vertically adjacent to each other,
It is configured to be shared for driving 11B. Accordingly
And a pixel circuit 12 for a pixel array of 2n rows × m columns
N scanning lines 13-1 to 13-n selected in row units;
M data lines for supplying luminance data to each pixel circuit 12
14-1 to 14-m are wired in a matrix. Each pixel has two vertically adjacent pixels.
The driving selection of the organic EL elements 11A and 11B for pixels is performed.
Pair of selection switches 15A and 15B are set in units of two rows.
Have been killed. Accordingly, these selection switches 15
A, 15B are sequentially driven in a time-division manner in row units,
Selection of two systems for selecting the elephant organic EL elements 11A / 11B
Selection lines 16A-1 to 16A-n, 16B-1 to 16B-n
Are wired in units of two rows. The organic EL elements 11 are not arranged in a matrix.
For example, on the left side of the figure, n scanning lines
Scan line drive circuit 17 for selectively driving 13-1 to 13-n
However, on the right side of the figure, two selection lines 16A-1 to 16A-
select line drive for selecting and driving n, 16B-1 to 16B-n
The circuit 18 has m data lines 14-1 to 14-1 on the lower side of the figure.
Data line drive circuit for supplying luminance data to 4-m
19 are arranged respectively. The scanning line driving circuit 17 has, for example, n transfer stages.
And a scan line at the output end of each transfer stage.
One end of each of 13-1 to 13-n is connected. Selection line
The drive circuit 18 is, for example, a shift register of 2n transfer stages.
The selection line 16A is connected to the first half of the output terminal of each transfer stage.
-1 to 16A-n each have a selection line 16B in the latter half.
One ends of -1 to 16B-n are respectively connected.
That is, the driving by the selection line driving circuit 18
And the odd-numbered selection lines 16A-1 to 16A-n are sequentially selected.
Then, the select lines 16B-1 to 16B-n of the even-numbered rows are
They are selected in order. (First Circuit Example) Next, a specific example of the pixel circuit 12 will be described.
A typical circuit configuration will be described. FIG. 2 shows the pixel circuit 12.
FIG. 2 is a circuit diagram showing a first circuit example of FIG.
Minutes are given the same reference numerals. In FIG. 2,
The circuit configuration of two vertically adjacent pixels is shown. In FIG. 2, two pixels vertically adjacent to each other are displayed.
In the organic EL elements 11A and 11B, each cathode has a first voltage.
Source (eg, ground). Organic E
A selection switch is provided on each anode of the L elements 11A and 11B.
15A and 15B, for example, a Pch TFT 15
The drains of A and 15B are connected. These TF
In T15A and 15B, each source is commonly connected to the node N
Each gate is connected to a select line 16A (16A-1 to 16A-
n), 16B (16B-1 to 16B-n)
Has been continued. The node N has, for example, a Pch TFT 21
Drain is connected. The source of the TFT 21 is
It is connected to a second power supply, for example, a positive power supply Vcc. T
One end of a capacitor 22 is connected to the gate of FT21.
The other end is connected to the positive power supply Vcc. TFT
Further, for example, an Nch TFT 23
The drain is connected. The TFT 23 has a source
Data line 14 (14-1 to 14-m) and a gate
Are connected to the scanning lines 13 (13-1 to 13-n).
You. Next, the access device according to the first embodiment having the above configuration will be described.
Active matrix display device, that is, active matrix
About the specific operation in the organic EL display device,
This will be described with reference to the timing chart of FIG. First, at the beginning of a frame, a scanning line driving circuit
17, the scanning line 13 which is the first scanning line
-1 is selected (high level), and each pixel circuit in the first row
Twelve TFTs 23 are turned on. As a result,
Luminance data given through the data lines 14-1 to 14-m
Is written to the capacitor 22 via the TFT 23.
You. At this time, the selection line driving circuit 18 drives the
Line 16A-1 is in the selected state (low level), and selection line 1
Since 6B-1 is in a non-selected state (high level), the TFT
15A is turned on, and the TFT 15B is turned off. In this state, the TFT 21 has the capacity
The current corresponding to the luminance data written in the
Organic EL element 11A through TFT 15A
Pour As a result, the organic EL element 11A in the first row emits light.
State, and emits light at a luminance corresponding to the flowing current. one
On the other hand, since the TFT 15B is in the off state, the organic
No current flows through the EL element 11B, and the organic EL element 1
1B is turned off. Next, the driving by the scanning line driving circuit 17 is performed.
Then, the scanning line 13-2 is selected. This scanning line 13-2
At the time of selection, the same pixel circuit as that at the time of selecting the scanning line 13-1 is used.
By the circuit operation of 12, the organic EL element 11A in the third row is
It becomes a light emitting state, and the organic EL element 11B in the fourth row is turned off.
State. Thereafter, similarly, the scanning lines 13-3,.
Perform writing operation of luminance data while selecting 3-n
As a result, the organic EL elements 11A on the odd rows of the screen emit light.
I do. Thereafter, driving by the scanning line driving circuit 17 is performed.
, The scanning line 13-1 is selected again, and each pixel in the first row is selected.
The luminance data is stored in the capacitor 22 through the TFT 23 of the circuit 12.
Write data. At this time, the driving of the selection line driving circuit 18 is performed.
Causes the selection line 16A-1 to be in a non-selected state,
Since TFT 16B-1 is in the selected state, TFT 15A is turned on.
In this state, the TFT 15B is turned off. This allows key
A current corresponding to the luminance data written to the capacitor 22
Is the organic EL element through TFT21 and TFT15B.
It flows to child 11B. As a result, the organic EL element 11B in the second row
It emits light and emits light at a luminance corresponding to the flowing current.
On the other hand, since the TFT 15A is in the off state, the presence of the
No current flows through the organic EL element 11A and the organic EL element
11A is turned off. Thereafter, in the same manner, the scanning line 1
Write luminance data while selecting 3-2, ..., 13-n
Operation, the organic EL elements on the even rows of the screen are
The child 11B emits light and writes the luminance data for one frame.
Only complete. As described above, the current corresponding to the luminance information is
The pixel circuit 12 that flows through the organic EL elements 11A and 11B
And two TFTs 21 and 23 and one capacitor 2
The pixel circuit 12 is composed of, for example,
By sharing between two vertically adjacent pixels
And the selection transistors (TFTs 15A and 15B)
Although added, four TFTs 15A, 15B, 2
Pixels of 2 pixels with 1, 23 and one capacitor 22
A circuit can be configured. That is, the pixel circuit 12 is provided for each pixel.
In this case, four TFTs and two TFTs
Occupies a large area compared to the need for capacitors
One capacitor that tends to be used can be reduced. Therefore,
The production yield can be improved by the amount. Also, the capacitor
Pixel area can be reduced by one
It is possible to narrow the elementary pitch,
High resolution and high definition can be achieved. In particular, the luminance data for all pixels in odd rows
Data and write luminance data to all pixels in even rows.
Since the drive system that alternates between
Signals now support interlaced scanning
If it is a video signal, it is displayed using this image signal as it is.
In addition to being able to perform
Without interfering with interlaced scanning.
This is particularly useful for displaying image signals. On the other hand, the image signal is progressive (sequential).
If the scanning method is supported, externally
In the first half of one frame.
To temporarily store several rows of luminance data in the image memory
Write the luminance data of the odd-numbered rows first, and write the even-numbered rows in the latter half.
To read and write the luminance data from the image memory
The driving method may be adopted. Alternatively, if the frame frequency is a standard 60
If the value is in the order of Hz, only certain even rows are
In the next frame, alternately write only odd rows
Is practical because it does not cause flicker
The driving frequency can be halved while obtaining a good image quality. This
In the case of, the resolution of the video will decrease, but for still images
An image with a resolution of 2n rows x m columns can be obtained
You. [Modification of the First Embodiment] FIG.
Active matrix type according to a modification of the first embodiment
FIG. 2 is a block diagram illustrating a configuration of a display device.
Equivalent parts are denoted by the same reference numerals. Active matrix according to the first embodiment
In the type display device, two systems (A, B) of organic EL elements 11
A and 11B are arranged in a pixel array in which rows are alternately arranged.
In contrast, the active matrix type according to this modification is
In the display device, two systems of organic EL elements 11A and 11B are used.
The so-called checkerboard alternately arranged for each row and each column
The difference is that the pixel array of the pattern is adopted.
The other basic configuration is the same. Checkered pattern
In order to realize the elementary array, two selection lines 16A (16
A-1 to 16A-n), 16B (16B-1 to 16B-
n) is a wiring structure in which each row crosses, for example, every pixel.
Structure is adopted. As a result, the first data line (the odd column data line)
Data lines 14-1, 14-3, ..., 14-m-1)
In the pixel, write the luminance data to the whole pixel in odd-numbered rows.
And writing of luminance data to all the pixels in the even rows.
Are alternately performed, while the odd-numbered rows on the first data line are
While the luminance data is being written to the pixel,
Second data lines (the odd-numbered data lines 14-2, 14-
4,..., 14-m).
Data is written, and even-numbered rows on the first data line are written.
While the luminance information is written to the pixel, the second data
The luminance data is written to the odd-numbered pixels on the line.
Be done. As a result, the first from the selection line driving circuit 18
Are output, the first column in the first row,
The organic EL elements 11A in the third row,.
Organic EL in the second, fourth,..., M-th columns in the row
The element 11A emits light, and then the selection line driving circuit 18
When the second selection pulse is output, 1 in the second row
The organic EL element 11B in the third, third,...
And the second column, the fourth column,..., And the m-th column in the first row
EL element 11B emits light, and so on.
Of the two pixels adjacent to the left and right on the scanning line in synchronization with the scanning
Is driven so that one of them emits light. Active matrix according to the first embodiment
In the type display device, first, writing is performed on all pixels in odd rows of the entire screen.
And then write to all pixels in even rows.
This is an interlaced scanning method, and as described above,
If the frame frequency is about 60Hz, flicker will occur
I do not do. However, at a frame frequency of 60 Hz
Compared to progressive scanning of pixels,
However, there is a drawback that the scanning lines are conspicuous. This is the pixel
Repeatedly turns on (emission) and turns off the light for each scanning line.
It is caused by that. On the other hand, the active
In a matrix type display device, scanning lines are synchronized with vertical scanning.
One of the two left and right adjacent pixels emits light
The scanning line is visually controlled,
It becomes difficult to stand. In FIG. 4, for simplicity, a single color table is shown.
Display device, but in the case of a color display device,
The configuration in FIG. 4 may be adopted for each color. In the above embodiment and its modified example,
Means that one pixel circuit 12 is shared between two vertically adjacent pixels.
But it is not limited to this.
It is also possible to extend it so that it is shared between the above pixels.
It is clear. However, for many pixels, one pixel
When the road 12 is shared, each organic E
Since the light emission time of the L element becomes shorter,
In order to achieve this, it is necessary to increase the peak luminance of the organic EL element.
It is necessary. In the above embodiment and its modified example,
Is an action using an organic EL element as a pixel display element.
When applied to an active matrix type organic EL display device
Although described using an example, the present invention is not limited to this.
Instead, electro-optics whose brightness changes depending on the flowing current
Active matrix table using elements as display elements
The present invention can be applied to all display devices. (Second Circuit Example) FIG.
FIG. 3 is a circuit diagram showing two circuit examples, in which parts equivalent to FIG.
Are denoted by the same reference numerals. Also, in FIG.
2 shows a circuit configuration of two adjacent pixels. In FIG. 5, two pixels vertically adjacent to each other are displayed.
The cathodes of the organic EL elements 11A and 11B are grounded.
ing. For each anode of the organic EL elements 11A and 11B
Is one end of each of the selection switches 15A and 15B, for example, Pc
h, the drains of the TFTs 15A and 15B are connected.
You. Each of the TFTs 15A and 15B has a source connected to a node.
N, and each gate is connected to a select line 16A (16A).
-1 to 16A-n), 16B (16B-1 to 16B-
n). The node N has, for example, a Pch TFT 31
Drain is connected. The source of TFT 31 is positive
It is connected to the power supply Vcc. TFT 31 gate and gate
For example, an Nch TFT 32 is connected between the
Have been. The gate of the TFT 32 is connected to the reset line 36.
Has been continued. The gate of the TFT 31 has a capacitor 3
3 is connected to one end. Positive with the other end of capacitor 33
A capacitor 34 is connected between the power supply Vcc.
You. The other end of the capacitor 33 further includes, for example, an Nch
The drain of the TFT 35 is connected. TFT35
Indicates that the source is connected to the data line 14 (14-1 to 14-m).
The gate is connected to the scanning line 13 (13-1 to 13-n).
It is connected. The pixel circuit according to the second circuit example having the above configuration is
Its basic functions are shown in Figure 1
The pixel circuit is similar to the pixel circuit of FIG.
The feature is that it is shared between two adjacent pixels
ing. That is, the pixel circuit according to the second circuit example is
As in the pixel circuit according to the circuit example, FIG.
Active matrix can be arranged in a matrix
A type organic EL display device can be configured. In addition,
For the reset line 36, the scanning line 13 and the selection line 16
Same as A and 16B, one wire every two rows
become. Here, the specific operation will be described with reference to FIG.
This will be described with reference to the timing chart of FIG. First, the selection line 16A is set to the non-selection state (high level).
), With the selection line 16B in the selected state (low level)
, The scanning line 13 and the reset line 36 are selected.
(Both are high level), and by the switching TFT 32
The gate and drain of the driving TFT 31 are short-circuited. Next
The selection line 16B is in a non-selected state (high level).
When the TFT 15B is turned off, FIG.
Reset operation is performed similarly to the case of the pixel circuit of FIG. Re
When the set operation is completed, the reset line 36 is not selected.
(Low level). Subsequently, the potential of ΔVdd is applied to the data line 14.
The scanning line 13 is changed to a non-selected state (low level).
), The capacitor 3 through the TFT 35
4 is completed. And select
If the line 16A is in the selected state (low level), the TFT 15
A is turned on. At this time, the selection line 16B is not selected
In this state, the TFT 15B is off. In this state, the TFT 31 has the capacity
The current corresponding to the luminance data written in the
Organic EL element 11A through TFT 15A
Pour As a result, the organic EL element 11A enters a light emitting state.
Light is emitted at a luminance corresponding to the flowing current. On the other hand, TFT
Since 15B is in the off state, the organic EL element 11B has
No current flows, and the organic EL element 11B is turned off.
You. Thereafter, the scanning lines 13 (13-1 to 13-
Writing luminance data to pixels while sequentially selecting n)
By performing the operation, the organic EL elements 1 on the odd rows of the screen are displayed.
1A emits light. Write luminance data for odd rows
When the operation is completed, repeat the scanning from the first scanning line to the even-numbered rows.
By performing the writing operation of the luminance data by
The organic EL elements 11B on the even rows of the screen emit light, and
The writing of the luminance data for the memory is completed. As described above, the pixel circuit according to the second circuit example
For example, to share a path between two pixels that are vertically adjacent
5 TFTs 15A, 15B, 31, 32, 35
And two capacitors 33 and 34 for two pixel times
The road can be configured. That is, the pixel circuit of FIG.
When arranged for each, 8 TFTs and 4 TFTs for 2 pixels
Is required, whereas the transistor 3
And two capacitors. Therefore,
Only the manufacturing yield can be improved. For signal lines
Can also be reduced by two, and moreover,
The pixel area can be greatly reduced by reducing the number of pasitas by two.
The pixel pitch can be further reduced.
Display for higher resolution and higher definition.
It is. (Third Circuit Example) FIG. 7 shows a third circuit example of the pixel circuit 12.
FIG. 3 is a circuit diagram showing three circuit examples, in which parts equivalent to FIG.
Are denoted by the same reference numerals. Also, in FIG.
2 shows a circuit configuration of two adjacent pixels. In FIG. 7, two pixels vertically adjacent to each other are displayed.
The cathodes of the organic EL elements 11A and 11B are grounded.
ing. For each anode of the organic EL elements 11A and 11B
Is one end of each of the selection switches 15A and 15B, for example, Pc
h, the drains of the TFTs 15A and 15B are connected.
You. Each of the TFTs 15A and 15B has a source connected to a node.
N, and each gate is connected to a select line 16A (16A).
-1 to 16A-n), 16B (16B-1 to 16B-
n). The node N has, for example, a Pch TFT 41
Drain is connected. The source of TFT41 is positive
It is connected to the power supply Vcc. TFT31 gate and positive
A capacitor 42 is connected between the power supply 42.
The gate of the TFT 41 is further provided with, for example, an Nch TFT.
43 drains are connected. Gate of TFT43
Are connected to the scanning lines 13. Source of TFT43
The gate and the drain of the TFT 44 of Pch
Connected in common. The source of TFT44 is positive
Connected to source Vcc. Gate / Drain of TFT44
The TFT 45 is connected between the data line 14 and the
I have. The gate of the TFT 45 is connected to the scanning line 13.
You. The pixel circuit according to the third circuit example having the above-described configuration includes:
The basic functions are shown in the figure given as Conventional Example 2.
12, but in this example, for example,
The feature is that it is shared between two adjacent pixels
ing. That is, the pixel circuit according to the third circuit example is
1, as in the pixel circuit according to the second circuit example, FIG.
If they are arranged in a matrix as shown in FIG.
A matrix type organic EL display device can be constructed
You. As described above, the pixel circuit according to the third circuit example is
For example, by sharing between two vertically adjacent pixels
6 TFTs 15A, 15B, 41, 42, 44,
A pixel circuit for two pixels with 45 and one capacitor 42
Can be configured. That is, the pixel circuit of FIG.
When 8 TFTs are arranged for 2 pixels and 1 TFT
Capacitors are required, but two transistors
And one capacitor can be reduced. So that's it
The production yield can be improved. Also occupies a large area
The pixel area can be reduced by the amount of one capacitor that can be reduced.
Since the pixel pitch can be reduced, the pixel pitch can be narrowed.
Thus, the display can have higher resolution and higher definition. As described above, according to the present invention,
By sharing the pixel circuit among multiple pixels in a time-sharing manner,
Thus, the number of elements of the pixel circuit per pixel can be reduced. Special
In addition, in order to have a function of compensating for variations in TFT characteristics,
When using a pixel circuit with a complicated circuit configuration,
By sharing the pixel circuit among a plurality of pixels, 1
Effective number of transistors and capacitors per pixel
Possible to increase production yields
And high-definition display
Can be easily realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a configuration example of an active matrix display device according to a first embodiment of the present invention. FIG. 2 is a circuit diagram illustrating a first example of a pixel circuit. FIG. 3 is a timing chart of a circuit operation of the pixel circuit according to the first circuit example. FIG. 4 is a block diagram illustrating a configuration example of an active matrix display device according to a modification of the first embodiment. FIG. 5 is a circuit diagram showing a second circuit example of the pixel circuit. FIG. 6 is a timing chart of the circuit operation of the pixel circuit according to the second circuit example. FIG. 7 is a circuit diagram illustrating a third circuit example of the pixel circuit. FIG. 8 is a circuit diagram showing a circuit configuration of a basic voltage writing type pixel circuit. FIG. 9 is a block diagram illustrating a configuration example of an active matrix display device. FIG. 10 is a circuit diagram showing a pixel circuit according to Conventional Example 1. FIG. 11 is a timing chart of the circuit operation of the pixel circuit according to Conventional Example 1. FIG. 12 is a circuit diagram showing a pixel circuit according to Conventional Example 2. [Description of Signs] 11A, 11B: Organic EL element, 12: Pixel circuit, 1
3, 13-1 to 13-n ... scanning lines, 14, 14-1 to 1
4-m: data line, 15A, 15B: selection switch, 1
6A, 16A-1 to 16A-n, 16B, 16B-1
16B-n: selection line, 17: scanning line driving circuit, 18: selection line driving circuit, 19: data line driving circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 624 G09G 3/20 624B 641 641D H05B 33/14 H05B 33/14 A F term (Reference) 3K007 AB02 AB06 AB17 AB18 BA06 BB07 DB03 EB00 GA04 5C080 AA06 BB05 DD05 DD22 DD27 EE28 FF11 JJ02 JJ03 JJ04 5C094 AA05 AA07 AA15 AA43 AA44 AA45 AA51 AA55 BA03 BA27 CA19 DA09 DA13 DB01 DB04 EA04 FB01

Claims (1)

1. An active matrix display device in which pixels each having an electro-optical element whose luminance changes according to a flowing current are arranged in a matrix, and are provided in common for a plurality of pixels. A pixel circuit for flowing a current corresponding to luminance information given through a data line to each electro-optical element of the plurality of pixels; and an electro-optical element of a pixel to be driven by the pixel circuit from among the plurality of pixels. An active matrix display device comprising: a selection unit for selecting. 2. The pixel circuit according to claim 1, wherein the pixel circuit is provided in common for each of two adjacent rows of pixels, and writes luminance information to all pixels in odd rows and writes luminance information to all pixels in even rows. 2. The active matrix display device according to claim 1, wherein the steps are alternately performed. 3. The pixel circuit is provided in common for each of two adjacent rows of pixels. In the pixels on the first data line, writing of luminance information to the entirety of odd-numbered rows and generation of even-numbered rows of pixels are performed. While the writing of the luminance information to the entire pixel is performed alternately, while the writing of the luminance information is performed to the pixels of the odd-numbered row on the first data line, the pixels of the even-numbered row on the second data line adjacent thereto are written. And write the luminance information to the odd-numbered pixels on the second data line while the luminance information is written to the even-numbered pixels on the first data line. 2. The active matrix display device according to claim 1, wherein the operation is performed. 4. An active matrix organic electroluminescent display in which pixels having, as display elements, organic electroluminescent elements each having first and second electrodes and an organic layer including a light emitting layer between these electrodes are arranged in a matrix. A pixel circuit that is provided in common to a plurality of pixels and that passes a current according to luminance information given through a data line to each organic electroluminescence element of the plurality of pixels; And a selecting means for selecting an organic electroluminescent element of a pixel to be driven by the pixel circuit from the above. 5. The pixel circuit is provided in common for each of two adjacent rows of pixels, and writes luminance information to all pixels in odd rows and writes luminance information to all pixels in even rows. 5. The active matrix organic electroluminescence display device according to claim 4, wherein the steps are alternately performed. 6. The pixel circuit is provided in common for each of two adjacent rows of pixels, and writes, on pixels on a first data line, luminance information to all of the odd-numbered rows of pixels and an even-numbered row of pixels. While the writing of the luminance information to the entire pixel is performed alternately, while the writing of the luminance information is performed to the pixels of the odd-numbered row on the first data line, the pixels of the even-numbered row on the second data line adjacent thereto are written. And write the luminance information to the odd-numbered pixels on the second data line while the luminance information is written to the even-numbered pixels on the first data line. The active matrix type organic electroluminescent display device according to claim 4, wherein the operation is performed.
JP2001312322A 2001-10-10 2001-10-10 Active matrix type display device and active matrix type organic electroluminescence display device Pending JP2003122306A (en)

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