TW200412561A - Digital driving method and device of active-type OLED display - Google Patents

Abstract

The present invention provides a digital driving method and device of active-type OLED display. The device is formed of plural sets of pixel devices. The OLED of each pixel device is grounded with a common cathode. By controlling the potential of power line, the program display separation in digital driving structure is realized. During inputting the digital image, the power line potential is connected to GND, so that the OLED cannot emit light. During outputting the image data, the power line potential is connected to the positive voltage, so than the OLED emits light.

Description

200412561 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a digital driving method and device for an active organic light emitting diode display, especially a method for controlling the potential of a power supply line to achieve writing Brilliantly separated digitally driven architecture. [Previous technology] It is known that the current technology of TFT is divided into two types: a-Si TFT and poly-Si TFT. Generally, TFT_LCD refers to a-Si TFT, and the current technology is mature. , Is the mainstream product of LCD. The biggest difference between LTPS TFT and a-Si TFT is that the LTPS transistor needs to further undergo the laser tempering process step to convert the amorphous silicon film to a polycrystalline silicon thin film layer. LTPS is more ordered than aϋ TFT in the structure of Shi Xijing, so it can increase the electron conduction rate to 200 cm 2 / V-sec. LTPS technology can make the device smaller, reduce the overall device area by more than 50%; and improve the aperture ratio (aperture rati0), compared to a-Si TFT can produce higher resolution in the same size And reduce power consumption; in the design, the driver module can be directly integrated on the glass substrate (System on Glass), and some Driver 1 (: can be integrated into the glass substrate, which helps reduce the area and components required for the circuit board Quantity and drive the connection between the 1C and the panel electrode to reduce the material cost, and at the same time, it can avoid product damage caused by the assembly during the subsequent module assembly process, thereby improving the yield and reducing the manufacturing cost; Due to the use of the integrated driver 1C, in addition to reducing the weight of Ic, it can also reduce the rear stage: other materials required for installation, the overall weight will be greatly reduced. Because low temperature polycrystalline silicon (LTPS TFT) still has power saving, brightness High-resolution

萆 Page 5 200412561 V. Description of the invention (2) Thin, thin, and few contacts (less than 200 contacts, which helps to improve the yield, a — Si TFT is greater than 3842 contacts), etc. However, because the characteristics of thin film transistors manufactured by the low temperature polycrystalline silicon (L but ps) process will vary, when the driving system uses an analog (ANAL0G) modulation method to represent grayscale, it is often because of the thin film Transistors (TFTs) have different characteristics after undergoing the process of laser tempering. Even if the same voltage signal is written, the organic light emitting diodes of different pixels generate different currents and emit different brightness. This phenomenon f causes the organic light-emitting diode panel to display a grayscale error image, which seriously damages the image uniformity (Image Uniformity) [Summary of the Invention] 爰 Yes, the present invention 'avoids the absence of the existing write-in bright separation as described above. The digital drive of the display device xe 1) The device body (〇LED) is lowered to realize the writing of ay Sepa image data, the potential of the motor light-emitting diode is connected to ^ For the purpose, use the control drive in the Ming Architecture. The main device of the present invention mainly connects each day-to-day grounding mode, and the digits of (P r 〇ed) are connected to zero. In the output shadow, the organic device is used to solve the above-mentioned traditional lack of power line potential. The organic light-emitting diode display is composed of a complex array of pixels (the organic light-emitting diode of the P i device uses a high-voltage gram D isp 1-bit drive structure to control the power line potential. When the shadow potential (GND) is input to make image data available, The power diode will be illuminated. Page 6 200412561 V. Description of the invention (3) The invention is as follows: [The diagram briefly illustrates the details and technical description, and the first diode will now be described in conjunction with the diagram. Body display 1st 2nd 2nd 3rd 3rd [Embodiment 1] Figure 1 is the intention of the active organic light emitting device according to the first embodiment of the present invention. Timing chart of the driving voltage waveform of Figure 1 is the second embodiment of the present invention Example diagram. 'It is the timing diagram of the driving voltage waveforms in Figures 2 ~ 1.' It is the schematic diagram of the third embodiment of the present invention. The timing diagram of the driving voltage waveforms in Figure 1. The single pixel device of the indicator is shown in Figure 2. First 1 figure-2 figure—1 figure—2 figure, which is the third formula] Please refer to "the active intention of the first embodiment and the main invention of the first invention. The body 4 is connected to 1 to 1 positionlessly. It is separated by a complex element (ted 7 electric potential method to brighten the positive potential 1 ~ 1 of the above-mentioned organic light emitting device, and the light emitting array drawing device 1). Lee Pro) is connected to the 'input V Η, method, 1 ~ 2 light-V polar body dynamic voltage wave diode voxel (P i 0 organic control electric gram bit drive frame zero potential The organic device is shown in the diagram of the present invention ", which is a timing chart of a single pixel device of the first display device of the present invention. As shown in the figure: the digital driving method of the display device and the device X e 1) Light-emitting diode (〇LED) 4 The source line 7 has a high or low potential to achieve the Display S e structure (when inputting image data, GND), and when the organic light-emitting diode is used, the electric light-emitting diode 4 of the power line 7 is used. Shines. Using pixels (P i xe 1)

Page 7 200412561 V. Description of the invention (4) The device 10 includes: a switching unit 1, a drive organic light emitting diode (0 LED), a setting unit 1 I, ϋ μ β, a switching unit 3 and an organic fan No Diode (〇LED) The above-mentioned switching unit 1 can be a P-channel thin-film electrical switching unit 1. The two input terminals 1 1 and 12 are respectively connected to L 1 ne) 5 and a data line (/ U 疋 牧; the drive The unit 2 may be a thin p-channel. The input terminal of the driving unit 2 is connected to the electric terminal 2 and the output terminal 13 of the other input terminal 2 is connected. The storage unit 3 is composed of a capacitor. Connected to the connection point of the wheel output terminal 1 of the switch unit 1 and the drive 2; the organic light emitting diode (0LED) 4 = the output terminal 23 of the unit 2 is connected, and the output terminal 4 of the organic dagger 1)) 4 is grounded ; When this device is scanning image data, the electric potential is GND, so that organic light is emitted. ”, Unit! Shows a conducting state, this 0 = yuan ... After scanning line 5 with _ = ^ 疋 The switch unit is turned on to store the storage inflammation, then the zero voltage GNDm is stored and charged.) If it is not lit, the positive voltage storage unit 3 is stored. Process The potential of the scanning line is zero ^ the potential G n D in the storage unit 7 and the storage unit 2 4 stores

Scan ne) 6 is connected to the crystal power supply 2 and the early transmission line is not available); the body (TF, here is connected with a scan line Data Li crystal (TF D), the line (SU ppl and the above-mentioned switch are only grounded, The other end of the wheel 2 is connected to the input terminal 2 and the input terminal 41 is connected to the above-mentioned photodiode (the potential of 0L7 is connected to the method, and the switch material line 6 enters the open storage unit 3 (if the image data is sent, if The image data is medium; the potential of the scan line is being scanned

V. Description of the invention (5) fV Η ′ After all scanning operations are completed, the potential is connected to the potential VH, so that the organic light-emitting diode 4 storing the zero voltage GND at 2:, = 10 is illuminated.杳 丨-2nd, 2nd, 2-2, as shown in the second embodiment of the present invention, and is not shown in the second embodiment of the present invention, as shown in the first embodiment of the following figure: The active type of the present invention is; = Dynamic shape:?: Figure. * The dynamic method and device are mainly composed of a complex array of i-drives 20, and each pixel device 2 and 0 LEDs are used. The first diode (r: / T ===) P2 ... md ... In the video data, 1 the power line 7 is connected to the potential so that the organic light-emitting diode 4 cannot be illuminated, and the potential of the power line 7 is connected to Positive potential input: :: will light up when the data is displayed. Using an organic light-emitting diode To achieve the above-mentioned method, the device 20 adopted in the present invention includes:-a switching unit Yoji. …) :: 3 and an organic light-emitting diode (〇1 ^ 〇) 4 households :: Cheng: its; save the switch sheet "two input terminals ..." Li ") 5 and a fund; yes; scan fne) 6 2. connected;

The driving unit 2 can be a P-channel thin-film electric a. The input terminal of the driving unit 2 is connected to a power source: (suppL 200412561 V. Description of the invention (6) Input terminal 2 2 and the above-mentioned switch sheet YL 1 Ν Ε) 7 and the output terminal 13 of the other element 1 is connected; the storage element 3 is connected by a capacitor 搂 Λ, 7, and the other-terminal is connected to the switch unit; the output is connected to! Connection of the input end 22 of the source line; 3 /, drive unit 2

The output terminal 23 of the driving unit 2 is connected, and the terminal 41 is grounded to the output terminal 42 of the above-mentioned ED) 4. The light emitting diode (0L) When this device is scanning image data, the potential ..., makes the organic light emitting diode The potential is connected to the soap element 1 to show the conduction state. This: The method is turned off. The switch off unit 1 is scanned by scan line 5 = data line 6 enters on. The switch unit is turned on and the storage order f is stored in storage unit 3. (If it is bright, the negative voltage v B is stored in the storage i. If the image data is bright, then the zero electricity IGND is stored; the image data is the negative potential of the scanning line during the process: f early: 3 medium '· 4 The scan is performed at a positive potential VH, and after completion of L, the potentials of the other scan lines are connected to the positive potential ν Η = after the operation, the picture of the power line 7: there is a storage unit 3, an embodiment, an active organic light-emitting device 2 This is the active invention of the first invention of the present invention. The display is as shown in the figure. The position is shown in the figure. The local setting is i. Daily pigment (p 丨 χ e 丨) installation method and installation page ίο 20042004561

Each pixel device 3 0, (0 LED) 4 adopts a common cathode grounding method, and the organic light-emitting diodes of He 0 are high and low to achieve the bright separation of writing. 1 ay separated) t: gram D i S p When connecting to the image data, the potential of the power line 7 is connected to the bit drive structure. The organic light-emitting diode 4 cannot be illuminated during the input, which is at the f potential (GND) and the potential of the power line 7. When connected to a positive potential ν Η μ, the image data will light up. 'I make the organic light-emitting diode device 3, the unit 3, the above-mentioned switch sheet Sea e) 6 This drive YL element 1, one end of the element 1, the drive element violates the above 0 includes an organic switch unit element 1 Two-input π Li connection; INE of drive unit unit 2) Output terminal 1 Storage unit output terminal 1 is connected to the output of phase organic light-emitting element 2.

(Pixel) Unit 2 and a storage structure; wherein, the body (Ding F Ding), which is connected with a scanning line (ata L in crystal (TF Ding), the line (SUP p L and the above-mentioned switch single-end connected to the switch f 2 2 the connection, the other 8; the input 41 and the above photodiode (0L

Method, the present invention uses:-a switching unit, a light diode (〇LEd) 4 1 may be a thin p-channel and a transistor input terminal 1 1, 1 2 respectively connected ne) 5 and a data line (D 2 ′ It can be connected to the thin film electrical input end of the p channel 2 1 to the power supply 7 and the other end input mouth 2 2 '3; 3 is composed of a capacitor_ 3 and the drive unit 2 is adjacent to the scanning line diode scanning line diode (0 LED) 4 out of 3 up and organic hair

200412561 Invention description (8)

ED) 4 The output terminal 4 2 is grounded. When the device is scanning the image data at the zero potential GND, the organic electricity is generated—electricity. The potential of the original line 7 is connected to the unit 1 to show the conduction state. At this time: the pole body 4 cannot Lights up. In the switch-off unit 1, the data is scanned by the scanning line 5 and the data is entered from the data line 6. When the switch unit is turned on, the storage unit Γ is talked to, and stored in the storage unit 3 (on, the zero voltage is stored). GND at ==, electricity), if the image data is not bright, store the positive voltage v in the unit 3, if the image data is the scanning line potential in the process is in the storage unit 3; Is positive potential v Η, to be finished? ND, after the potentials of other scanning lines are connected to the positive potential VH, the power supply line 7 element 3 of the day element device 3 is: $ store zero voltage ... The above mentioned in the storage list is only the present invention. : J light-emitting diode 4 lights up. The scope of the invention. That is to say, the implementation of the examples is not intended to limit changes and modifications, etc .... It is covered by the same as the scope of the patented patent park for issuing patent applications for inventions. 200412561 Brief description of the drawings [Simplified description of the drawings] Figures 1-11 are schematic diagrams of a single pixel device of an active organic light emitting diode display according to the first embodiment of the present invention. Figures 1-2 are timing diagrams of driving voltage waveforms in Figures 1-1. Fig. 2-1 Fig. 2-2 Fig. 3-1 Fig. 3-2 is a schematic diagram of a second embodiment of the present invention. It is the timing chart of the driving voltage waveforms in Figures 2 to 1. It is a schematic diagram of a third embodiment of the present invention. This is the timing diagram of the driving voltage waveforms in Figure 3—1.

[Description of the symbols in the figure] Daytime device ... • 1 0 2 0, 3 0 input terminals ... • 1 1 1 2, 2 1 output terminals ... • 1 3 2 3, 4 2 switch unit ... • 1 drive unit ... • 2 storage unit ... • 3 organic light emitting diodes ... 4 scan lines ....... • 5% 8 data line .. • • 6 power line .. • 7 positive potential .. • V Η negative potential ... .... • VL zero potential .... • G Ν D 4 0 2 2 4

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Claims (1)

200412561 --------- 6. Scope of patent application 1 _ Digital driving device of active organic light emitting diode display 'This display is composed of a plurality of pixel devices, and each pixel device includes: Guan Zawu, which has two input terminals and one output terminal, which are connected to the data line and the scanning line; the terminal eight are not early, 'there are two input terminals and one output terminal on the two input knife ^ F 连接 The power cable is connected to the output terminal of the above-mentioned switch unit; the second unit of the switch: the upper end is connected to the ground, and the other end is connected to the above-mentioned switch: the output end is connected to the input end of the drive unit; Panxi pole 3 'has-input terminal and output terminal, the output terminal of this input d: 70 is connected, and the output terminal is grounded; zero potential, so that the organic light emitting diode U: electricity: the potential of the line is connected to the line scan After that, it is stored in the storage = line; after scanning, Yuanli's store the zero voltage in the storage order-from # ~ Like the material is bright and store the positive voltage in the storage unit: b into: 2? Data is not sent On, the stored potential is connected to a positive potential: there is a scanning action After that, the organic light emitting diode of the power line is illuminated. The sub-voltage is stored in the pixel of the storage unit. Regarding the digital driving device of the main body display device described in item 1 of the scope of the patent application, the potential of the K active organic light-emitting diode is zero, and the other is green + Scanning during the scanning process 3. If the patent application is applied, the potential is positive. Digital drive device for stereo display, κ active organic light emitting diode. Among them, the switch unit and drive unit can be page 14 200412561 6. Patent application scope: P-channel thin film transistor (T F τ). 4. The active type digital display device as described in item 1 of the scope of patent application, wherein the storage diode constitutes 0, and is an active organic light emitting diode display. Digital driving device = · This tribute is composed of a plurality of pixel devices, each pixel unit has two input terminals and one output terminal, and the terminals are respectively connected to the data line and the scan line;鳊 The two input terminals are divided into two input terminals and one output ^ The two inputs are connected to the output terminal of the storage iir ii switch unit; the second terminal is connected to the output terminal of the above-mentioned switch unit, and the other terminal is connected to the organic light-emitting diode. Pole :: the connection point of the input terminal; the input terminal and the output terminal 2 of the driving unit have an input terminal and an output terminal, and this input when the pixel device is grounded; zero potential, when the organic light emitting diode ^, the power supply After the potential of the line is connected to the line scan, save the storage order # 枓 The line enters the switch unit, and after scanning, it is stored ... In the image data is bright, store the zero voltage in the storage unit. On, the stored potential is connected to Potential, and:: After the scanning action is performed, the organic light emitting diode placed on the power line is illuminated and the negative voltage is stored in the pixel of the storage unit. 6 As claimed in Item 5 of the patent scope, +, + + & Active Organic Light-Emitting Diodes Item 5 page 200412561 6. Digital driving device for patent application integrated display, in which, the line potential is negative thunder #, · ^ during the dry drawing process !! The potentials of other scanning lines are known as positive organic light-emitting diodes. This display is composed of a plurality of pixel devices, and the digital driving device includes: 乂, the mother-pixel device Baoshan, a switch unit, which has two input terminals and the end is a separate connection data line and scan line ; Wheel output end, the two input drive unit has two input ends on the power line and the switch unit end, the two input one storage unit is connected to the output end; the switch unit is connected to the input end of the drive unit The output terminal and the trace line; & is connected to an adjacent pixel device of an organic light emitting diode, which has an input terminal and an output terminal of the driving unit: an f input terminal and an output terminal. The pixel device is scanning; = material = terminal is grounded; zero potential, so that the potential of the organic light emitting diode circuit & power line is connected to the on state, at this time the image data is converted from information line = hair line, the switch unit presents a wire After scanning, it is stored in the storage unit. 0 is stored in the switch unit. After scanning, the zero voltage is stored in the storage unit. == The image data is bright and the positive voltage is stored in the storage unit. Information is not Liang, a potential of the reservoir connected to the positive potential, the scanning operation of the Part II, the OLED of the power supply line opposing shiny. The voltage is mounted on the pixel of the storage unit. 8. The digital driving device of the body display, such as the item 7 of the scope of patent application, its active organic light emitting diode, the scanning during the scanning process. 16th stomach 200412561 The line potential is zero potential, and the other scans are: 9. Kinds of active organic light-emitting:] The second potential is positive potential. The method is mainly when the image data of the digital driver of the display device is mounted on a complex array of pixels. The power line potential is connected to the input unit of each pixel device. # 亮 ， I # &%#-f connected to zero potential , Make the organic light-emitting diode: '1 When outputting image data, connect the potential of the power line to a positive potential', so that the organic light-emitting diode is bright. The potential is connected to 10, as shown in item 7 of the scope of the patent application. The active digit display is driven by **, which can draw 5 = t machine-emitting diodes (〇LED). Cathode ground mode. , Page 17