USRE47257E1 - Voltage-programming scheme for current-driven AMOLED displays - Google Patents
Voltage-programming scheme for current-driven AMOLED displays Download PDFInfo
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- USRE47257E1 USRE47257E1 US14/326,705 US201414326705A USRE47257E US RE47257 E1 USRE47257 E1 US RE47257E1 US 201414326705 A US201414326705 A US 201414326705A US RE47257 E USRE47257 E US RE47257E
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Definitions
- the reissue applications are (1) Ser. No. 14/090,320, which is an application for reissue of U.S. Pat. No. 8,232,939 and has been reissued as U.S. Pat. No. RE45,291 E, (2) application Ser. No. 14/326,705 (the present application), which is a continuation reissue of U.S. Pat. No. 8,232,939, and (3) application Ser. No. 14/326,677, which is a divisional reissue of U.S. Pat. No. 8,232,939.
- the present invention relates to a display technique, and more specifically to technology for driving pixel circuits.
- AMOLED Active matrix organic light emitting diode
- the AMOLED displays are classified as either a voltage-programmed display or a current-programmed display.
- the voltage-programmed display is driven by a voltage-programmed scheme where data is applied to the display as a voltage.
- the current-programmed display is driven by a current-programmed scheme where data is applied to the display as a current.
- the advantage of the current-programming scheme is that it can facilitate pixel designs where the brightness of the pixel remains more constant over time than with voltage programming.
- the current-programming requires longer time of charging capacitors associated with the column.
- the present invention relates to a system and method of driving a pixel circuit in an AMOLED display.
- the system and method of the present invention uses Voltage-Programming Scheme For Current-Driven AMOLED Displays.
- a system for driving a display which includes a plurality of pixel circuits, each having a plurality of thin film transistors (TFTs) and an organic light emitting diode (OLED), which includes: a voltage driver for generating a voltage to program the pixel circuit; a programmable current source for generating a current to program the pixel circuit; and a switching network for selectively connecting the data driver or the current source to one or more pixel circuits.
- TFTs thin film transistors
- OLED organic light emitting diode
- a system for driving a pixel circuit having a plurality of thin film transistors (TFTs) and an organic light emitting diode (OLED), which includes: a pre-charge controller for pre-charging and discharging a data node of the pixel circuit to acquire threshold voltage information of the TFT from the data node; and a hybrid driving circuit for programming the pixel circuit based on the acquired threshold voltage information and video data information displayed on the pixel circuit.
- TFTs thin film transistors
- OLED organic light emitting diode
- a system for driving a pixel circuit having a plurality of thin film transistors (TFTs) and an organic light emitting diode (OLED), which includes: a sampler for sampling, from a data node of the pixel circuit, a voltage required to program the pixel circuit; and a programming circuit for programming the pixel circuit based on the sampled voltage and video data information displayed on the pixel circuit.
- TFTs thin film transistors
- OLED organic light emitting diode
- a method of driving a pixel circuit having a plurality of thin film transistors (TFTs) and an organic light emitting diode (OLED), which includes the steps of: selecting a pixel circuit and pre-charging a data node of the pixel circuit; allowing the pre-charged data node to be discharged; extracting a threshold voltage of the TFT through the discharging step; and programming the pixel circuit, including compensating a programming data based on the extracted threshold voltage.
- TFTs thin film transistors
- OLED organic light emitting diode
- FIG. 1 is a block diagram showing a system for driving an AMOLED display in accordance with an embodiment of the present invention
- FIG. 2 is a schematic diagram showing one example of a pixel circuit of FIG. 1 ;
- FIG. 3 is a schematic diagram showing an example of a hybrid driving circuit, which is applicable to FIG. 1 ;
- FIG. 4 is an exemplary flow chart for showing the operation of the hybrid driving circuit of FIG. 3 ;
- FIG. 5 is an exemplary timing chart for showing the operation of the hybrid driving circuit of FIG. 3 ;
- FIG. 6 is a schematic diagram showing a further example of a hybrid driving circuit, which is applicable to FIG. 1 ;
- FIG. 7 is an exemplary flow chart for showing the operation of the hybrid driving circuit of FIG. 6 ;
- FIG. 8 is a schematic diagram showing a further example of a hybrid driving circuit, which is applicable to FIG. 1 ;
- FIG. 9 is an exemplary flow chart for showing the operation of the hybrid driving circuit of FIG. 8 ;
- FIG. 10 is an exemplary timing chart for showing the operation of the hybrid driving circuit of FIG. 8 ;
- FIG. 11 is a schematic diagram showing a further example of the pixel circuit of FIG. 1 ;
- FIG. 12 is a block diagram showing a system for driving an AMOLED display in accordance with a further embodiment of the present invention.
- FIG. 13 is an exemplary flow chart for showing the operation of the system of FIG. 12 ;
- FIG. 14 is an exemplary flow chart for showing the operation of the system of FIG. 12 ;
- FIG. 15 is an exemplary timing chart for showing the operation of the system of FIG. 12 ;
- FIG. 16 is an exemplary flow chart for a hidden refresh operation of the system of FIG. 12 ;
- FIG. 17 is a diagram showing an example of a sample of the current/voltage correction curve
- FIG. 18 is a diagram showing the current/voltage correction curve of FIG. 17 and an example of a newly measured data point:
- FIG. 19 is a diagram showing an example of a new current/voltage correction curve based on the measured point of FIG. 18 ;
- FIG. 20 is a block diagram showing a further example of a programming circuit for implementing a combined current and voltage-programming technique
- FIG. 21 is a block diagram showing a system for driving an AMOLED display in accordance with a further embodiment of the invention.
- FIG. 22 is a schematic diagram showing an example of a switch network of FIG. 21 ;
- FIG. 23 is a schematic diagram showing a system for correcting the current/voltage information of the pixel circuit.
- Embodiments of the present invention are described using an AMOLED display. Drive scheme described below is applicable to a current programmed (driven) pixel circuit and a voltage programmed (driven) pixel circuit.
- hybrid technique described below can be applied to any existing driving scheme, including a) any drive schemes that use sophisticated timing of the data, select, or power inputs to the pixels to achieve increased brightness uniformity, b) any drive schemes that use current or voltage feedback, c) any drive schemes that use optical feedback.
- the light emitting material of the pixel circuit can be any technology, specifically organic light emitting diode (OLED) technology, and in particular, but not limited to, fluorescent, phosphorescent, polymer, and dendrimer materials.
- OLED organic light emitting diode
- FIG. 1 there is illustrated a system 2 for driving an AMOLED display 5 in accordance with an embodiment of the present invention.
- the AMOLED display 5 includes a plurality of pixel circuits.
- FIG. 1 four pixel circuits 10 are shown as an example.
- the system 2 includes a hybrid driving circuit 12 , a voltage source driver 14 , a hybrid programming controller 16 , a gate driver 18 A and a power-supply 18 B.
- the pixel circuit 10 is selected by the gate driver 18 A (Vsel), and is programmed by either voltage mode using a node Vdata or current mode using a node Idata.
- the hybrid driving circuit 12 selects the mode of programming, and connects it to the pixel circuit 10 through a hybrid signal.
- a pre-charge signal (Vp) is applied to the pixel circuit 10 to acquire threshold Vt information (or Vt shift information) from the pixel circuit 10 .
- the hybrid driving circuit 12 controls the pre-charging, if pre-charging technique is used.
- the pre-charge signal (Vp) may be generated within the hybrid driving circuit 12 , which depends on the operation condition.
- the power-supply 18 B (Vdd) supplies the current required to energize the display 5 and to monitor the power consumption of the display 5 .
- the hybrid controller 16 controls the individual components that make up the entire hybrid programming circuit.
- the hybrid controller 16 handles timing and controls the order in which the required functions occur.
- the hybrid controller 16 may generate data Idata and supplied to the hybrid driving circuit 12 .
- the system 2 may have a reference current source, and the Idata may be supplied under the control of the hybrid controller 16 .
- the hybrid driver 12 may be implemented either as a switching matrix, or as the hybrid driving circuit(s) of FIG. 3, 6, 8 or 20 or combination thereof.
- Vdata refers to data, a data signal, a data line or a node for supplying the data or data signal Vdata, or a voltage on the data line or the node.
- Idata refers to data, a data signal, a data line or a node for supplying the data or data signal Idata, or a current on the data line or the node.
- Vp refers to a pre-charge signal, a pre-charge pulse, a pre-charge voltage for pre-charging/discharging, a line or a node for supplying the pre-charge signal, pre-charge pulse or pre-charge voltage Vp.
- Vsel refers to a pulse or a signal for selecting a pixel circuit or a line or a node for supplying the pulse or signal Vs.
- the terms “hybrid signal”, “hybrid signal node”, and “hybrid signal line” may be used interchangeably.
- the pixel circuit 10 includes a plurality of TFTs, and an organic light emitting diode (OLED).
- the TFT may be an n-type TFT or a p-type TFT.
- the TFT is, for example, but not limited to, an amorphous silicon (a-Si:H) based TFT, a polycrystalline silicon based TFT, a crystalline silicon based TFT, or an organic semiconductor based TFT.
- the OLED may be regular (P-I-N) stack or inverted (N-I-P) stack.
- the OLED can be located in the source or the drain of one or more driving TFTs.
- FIG. 2 illustrates an example of the pixel circuit 10 of FIG. 1 .
- the pixel circuit of FIG. 2 includes four thin film transistors (TFTs) 20 - 26 , a capacitor Cs 28 and an organic light emitter diode (OLED) 30 .
- the TFT (Tdrive) 26 is a drive TFT that is connected to the OLED 30 and the capacitor Cs 28 .
- the pixel circuit of FIG. 2 is selected by the select line Vsel, and is programmed by a data line DL.
- the data line DL is controlled by the hybrid signal output from the hybrid driving circuit 12 of FIG. 1 .
- the pixel circuit 10 of FIG. 1 may include less than four TFTs or more than four TFTs.
- data line DL and “data node DL” may be used interchangeably.
- the data node DL is pre-charged and discharged to acquire the threshold Vt of a drive TFT (e.g., Tdrive 26 of FIG. 2 ) or the threshold Vt shift.
- Vt shift, Vt shift information, Vt, and Vt information may be used interchangeably.
- the pixel circuit 10 is then consecutively programmed by the source driver 14 using voltage-programming. The acquired Vt shift information is utilized to compensate for degradation of the pixel circuit 10 , thus maintaining uniform brightness of the display 5 .
- the process of acquiring Vt starts by applying Vsel to T 1 20 and T 2 22 to the pixel circuit illustrated in FIG. 2 . Such action causes the drain and gate of T 3 24 to be at the same voltage. This allows the Vt of T 3 24 to be extracted by first applying the pre-charge voltage Vp to the data line DL, which is than allowed to be discharged.
- the rate of discharge is a function of Vt. Thus, by measure of the rate of discharge, Vt can be obtained.
- FIG. 3 illustrates an example of a hybrid driving circuit, which is applicable to the hybrid driving circuit 12 of FIG. 1 .
- the hybrid driving circuit 12 A of FIG. 3 implements voltage programming technique.
- the hybrid driving circuit 12 A of FIG. 3 includes a charge programming capacitor Cc 32 .
- the charge programming capacitor Cc 32 is provided between the data line Vdata and the data node DL.
- the pre-charge line Vp is also connected to the data node DL.
- the hybrid driving circuit 12 A is provided to a pixel circuit 10 A having four TFTs (such as the pixel circuit of FIG. 2 ).
- the pixel circuit 10 A may include more than four TFTs or less than four TFTs.
- the charge programming capacitor Cc 32 is provided to program the pixel circuit 10 A with a voltage that is equal to the sum of threshold Vt of the TFT and Vdata, scaled by a constant K.
- the constant is determined by the voltage division network formed by the charge storage capacitor (e.g. Cs 28 of FIG. 2 ) and the charge programming capacitor Cc 32 .
- FIG. 4 illustrates an exemplary flow chart for showing the operation of the hybrid driving circuit 12 A of FIG. 3 .
- pre-charge mode is enabled.
- a pixel circuit is selected and pre-charging (Vp) is started.
- Vt acquisition mode is enabled, and at step S 16 , discharging (Vp) starts.
- the Vt information is acquired through Cc 32 .
- writing mode is enabled.
- FIG. 5 illustrates an exemplary timing chart for showing the operation of the hybrid driving circuit 12 A of FIG. 3 .
- Vdata 0 represents voltage at the data node (e.g. DL of FIG. 2 ) of the pixel circuit;
- Idata 0 represents current at the data node (e.g. DL of FIG. 2 ) of the pixel circuit.
- the programming procedure starts by selecting the pixel to be programmed with the pulse Vsel.
- the pre-charge pulse Vp is applied to the pixel circuit's data input (e.g. DL of FIG. 2 ).
- Vt acquisition phase voltage on the data line (DL) is allowed to be discharged through the pixel circuit, which is in a current mirror connection with the Vsel line held high.
- the data line (DL) is discharged to a certain voltage, and the Vt of a drive TFT is extracted from that voltage.
- the voltage at Vdata is at ground.
- the calculated compensated voltage is applied to the data input line (DL) of the pixel circuit.
- the programming routine finishes with the lowering of the Vsel signal.
- the calculated compensated voltage is obtained through analog means of a charge programming capacitor Cc 32 .
- any other analog means for obtaining compensated voltage may be used.
- any (external) digital circuit e.g. 50 of FIG. 7 ) may be used to obtain the calculated compensated voltage.
- the source driver ( 14 of FIG. 1 ) supplies Vdata to the capacitor Cc 32 .
- Vdata is increased from ground to the desired voltage level, the voltage at Idata is equal to (Vt+Vdata)*K.
- FIG. 3 The structure of FIG. 3 is simple, and is easily implemented.
- FIG. 6 illustrates a further example of a hybrid driving circuit, which is applicable to the hybrid driving circuit 12 of FIG. 1 .
- the hybrid driving circuit 12 B of FIG. 6 implements voltage programming technique.
- the hybrid driving circuit 12 B includes a summer 40 , a sample and hold (S/H) circuit 42 and a switching element 44 .
- the S/H circuit 42 samples Idata and holds it for a certain period.
- the summer 40 receives Vdata and the output of the S/H circuit 42 .
- the switching element 44 connects the output of the summer 40 to the data node DL in response to a programming control signal 46 .
- the hybrid driving circuit 12 B utilizes the summer 40 , instead of the charge coupling capacitor Cc 32 , to produce programming voltage that is equal to the sum of Vt and Vdata.
- the hybrid driving circuit 12 B does not utilize a capacity, programming voltage is not affected by the parasitic capacitance, and it has less charge feed-through effect.
- the hybrid driving circuit 12 B does not utilize a charge storage capacitor, programming voltage is not affected by the charge storage capacitance.
- the hybrid driving circuit 12 B does not utilize a charge programming capacitor, it achieves faster Vt acquisition time. Removal of the charge programming capacitor eliminates the charge dependency of the programming scheme. Thus the programming voltage is not affected by the charge being shared between the charge storage capacitor and the parasitic capacitance of the system. This results in a higher effective programming voltage.
- FIG. 7 illustrates an exemplary flow chart for showing the operation of the hybrid driving circuit 12 B of FIG. 6 .
- the Vt is sampled at step S 20 , and new data is produced at step S 22 .
- the new data is supplied to the pixel circuit in response to the programming control signal ( 46 ) at S 24 .
- the new data may be produced after step S 18 .
- the control signal 46 may be enabled before step S 18 .
- Vdata is at ground, and the voltage at the data node DL is equal to Vt of the TFT by the pre-charging/discharging operation (Vp).
- the voltage on the data node DL is sampled and holed by the S/H circuit 42 .
- the Vt is provided to the summer 40 through the S/H circuit 42 .
- the summer 40 outputs the sum of Vt and Vdata.
- the switch 44 turns on in response to the programming control signal 46 .
- FIG. 8 illustrates a further example of a hybrid driving circuit, which is applicable to the hybrid driving circuit 12 of FIG. 1 .
- the hybrid driving circuit 12 C of FIG. 8 implements voltage programming technique.
- the hybrid driving circuit 13 C is a direct digital hybrid driving circuit.
- the direct digital programming circuit 13 C includes a microComputer uC 50 which receives digital data (Vdada), a digital to analog (D/A) converter 52 , a voltage follower 54 for increasing current without affecting voltage, and an analog to digital (A/D) converter 56 .
- the threshold Vt of the drive TFT may increase slowly. Thus, it may not be necessary to acquire the threshold Vt of the drive TFT every programming cycle. This effectively hides the Vt acquisition for the majority of the programming cycle.
- the threshold Vt acquired from the pixel circuit 10 A is digitalized at the A/D converter 56 , and is stored in memory contained in the uC 50 .
- the digital data that defines the brightness of the pixel is added to the Vt in the uC 50 .
- the resulting voltage is then converted back to an analog value at the D/A 52 , which is programmed into the pixel circuit 10 A.
- This programming method is designed to compensate for the slow process of the Vt acquisition.
- FIG. 9 illustrates an exemplary flow chart for showing the operation of the hybrid driving circuit 12 C of FIG. 8 .
- the Vt acquisition mode the Vt is sampled and recorded at step S 30 .
- writing mode When writing mode is enabled, new data is provided based on the recorded data. It is noted that the operation of the system having the hybrid driving circuit 12 C of FIG. 8 is not limited to FIG. 9 .
- the data which have been recorded may be used without implementing the Vt acquisition.
- FIG. 10 illustrates an exemplary timing chart for showing the operation of the hybrid driving circuit 12 C of FIG. 8 .
- the hybrid driving circuit 13 C may use the Vt that has been previously acquired and has been recorded in the uC 50 .
- the conversion of the output on the data node DL by A/D can remove the requirements of having to acquire the Vt every programming cycle.
- the Vt of the pixel circuit 10 A may be acquired once every second or less. Thus, it may acquire Vt for only one row of the display per frame cycle. This effectively increases the amount of time for the pixel programming cycle. Less frequent need of Vt acquisition ensures faster programming time.
- FIG. 2 is used to describe the pixel circuit 10 of FIG. 1 .
- the pixel circuit 10 is not limited to that of FIG. 2 .
- the pixel circuit 10 may be a pixel circuit illustrated in FIG. 11 (J. Kanichi, J.-H. Kim, J. Y. Nahm, Y. He and R. Hattori “Amorphous Silicon Thin-Film Transistor Based Active-Matrix Organic Light Emitting Display” Asia Display IDW 2001 pp. 315).
- the pixel circuit of FIG. 11 includes four TFTs 64 - 70 , a capacitor C ST 72 and an OLED 74 .
- the TFT 78 is a drive TFT that is connected to the OLED 74 and the capacitor C ST 72 .
- the pixel circuit of FIG. 11 is selected by Vselect 1 and Vselect 2 , and is programmed by Idata.
- the voltage acquired is a combination of the voltage across the OLED 74 and T 3 68 .
- the technique compensates the voltage change of both the Vt and the OLED 74 .
- Idata of FIG. 11 corresponds to the data node DL of FIG. 2 .
- FIG. 12 illustrates a system for driving an AMOLED display in accordance with a further embodiment of the invention.
- the system 82 of FIG. 12 includes a hybrid programming circuit having a correction table 80 , a source driver 14 for implementing a voltage-programming scheme and a reference current source 94 for implementing a current-programming scheme.
- the system 82 drives a display having a plurality of pixel circuits using the voltage-programming scheme and the current-programming scheme.
- a hybrid controller 98 is provided to control each component.
- the hybrid controller 98 is placed between the A/D converter 96 and the correction table 80 , as an example.
- the hybrid controller 98 is similar to the hybrid controller 16 of FIG. 1 .
- the pixel circuit driven by the system 82 may be the pixel circuit 10 of FIG. 1 , and may be a current programmed pixel circuit or a voltage programmed pixel circuit.
- the pixel circuit driven by the system 82 may be implemented by FIG. 2 or FIG. 11 , however, is not limited to those of FIGS. 2 and 11 .
- the hybrid programming circuit includes a correction calculation module 92 for correcting data from the data source 90 based on the correction table 80 and an A/D converter 96 .
- the data corrected by the correction calculation module 92 is applied to the source driver 14 .
- the source driver 14 generates Vdata based on the corrected data output from the correction calculation module 92 .
- Vdata from the source driver 14 and Idata from the reference current source 94 are supplied to the hybrid driver 12 .
- the data source 90 is, for example, but not limited to, a DVD.
- the hybrid driver 12 may be implemented either as a switching matrix, or as the digital programming circuit(s) of FIG. 8, 20 or combination thereof.
- the A/D converter 96 may be the A/D converter 56 of FIG. 8 .
- the system 82 may implement the Vt acquisition technique described above using the A/D converter 96 ( 56 ).
- the correction table 80 is a lookup table.
- the correction table 80 records the relationship between current required to program the pixel circuit and voltage necessary to obtain that current.
- the correction table 80 is built for every pixel in the entire display.
- the correction table 80 is illustrated separately from the correction calculation module 92 . However, the correction table 80 may be included in the correction calculation module 92 .
- the operation of the system of FIG. 12 has two modes, namely display mode and calibration mode.
- the display mode the data from the data source 90 is corrected using the data in the correction table 80 , and is applied to the source driver 14 .
- the hybrid driver 12 is not involved in the display mode.
- the calibration mode the current from the reference current source 94 is applied to the pixel circuit, and the voltage associated with the current is read from the pixel circuit. The voltage is converted to a digital data by the A/D converter 96 .
- the correction table 80 is updated with the correct value based on the digital data.
- a voltage-programming scheme is implemented.
- the voltage on the data line (e.g. DL of FIG. 2 ) of the pixel circuit determines the brightness of the pixels.
- the voltage required to program the pixel circuit is calculated from the pixel brightness to be displayed (from the incoming video information) combined with the current/voltage correction information stored in the correction table 80 .
- the information on the correction table 80 is combined with incoming video information to ensure that each pixel will maintain a constant brightness over long-term use.
- the current source 94 is connected to the data input node (DL) of the pixel circuit via the hybrid driver 12 .
- Each pixel is programmed through a current-programming scheme (where the level of current on the data line determines the brightness of the pixel), and the voltage required to achieve that current is read by the A/D converter 96 .
- the voltage required to program the pixel current is sampled at multiple current points by the A/D converter 96 .
- the multiple points may be a subset of the possible current levels (e.g. 256 possible levels for 8-bit, or 64 levels for 6-bit). This subset of voltage measurements is used to construct the correction table 80 that is interpolated from the measurement points.
- the calibration mode may be entered either through user's command or may be combined with the normal display mode so that the calibration takes place during the display refresh period.
- the entire display may be calibrated at once.
- the display may stop showing incoming video information for a short period of time while each pixel was programmed with a current and the voltage recorded.
- a subset of the pixels may be calibrated, such as one pixel every fixed number of frames. This is virtually transparent to the user, and the correction information may still be acquired for each pixel.
- the table lookup technique combines the technique of the current-programming scheme with the technique of the voltage-programming scheme.
- the pixel circuit is programmed with a current through a current-programming scheme. A voltage to maintain that current is read and is stored at a lookup table. The next time that particular level of current is applied to the pixel circuit, instead of programming with a current, the pixel circuit is programmed based on information on the lookup table. Accordingly, it attains the compensation inherent in the current programming scheme while attaining the fast programming time that is only possible with voltage-programming scheme.
- the correction table (lookup table) 80 is used to correct the current/voltage correction information.
- the system 82 of FIG. 12 may use the lookup table to correct the Vt shift and the current/voltage correction information at the same time in combination with the hybrid driving circuit of FIG. 3, 6, 8 or 20 .
- the hybrid controller 98 extracts the Vt shift information by extending the voltage versus current curve to zero current point.
- the Vt shift information is stored in an array of tables (correction table 80 ) which is applied to incoming display data.
- the uC 50 of FIG. 8 or 20 may utilize the lookup table to generate appropriate voltage and program the pixel circuit.
- the hybrid circuits 12 A of FIGS. 3 and 12B of FIG. 6 may be integrated into the system of FIG. 12 .
- FIGS. 13-14 illustrate exemplary flow charts for showing the operation of the system of FIG. 12 .
- calibration mode is enabled.
- a pixel circuit is selected and current programming is implemented to the selected pixel circuit.
- a switch matrix enable signal is enabled. Then the connection to the pixel circuit is changed.
- the Vt is sampled at step s 46 , and then the correction table is created/corrected at step S 48 .
- video data are corrected based on the correction table.
- new Vdata is produced based on the corrected data.
- the writing mode may be implemented based on the previously created correction table without implementing the calibration mode. It is noted that the operation of the system of FIG. 12 is not limited to FIGS. 13-14 .
- FIG. 15 illustrates an exemplary timing chart for showing a combination of the Vt shift acquisition and the current/voltage correction.
- a switch matrix enable signal in FIG. 15 represents a control signal for the hybrid driver 12 of FIG. 12 .
- the calibration mode i.e. the current-programming scheme
- the programming mode i.e. the voltage-programming scheme
- the calibration mode may be enabled when the switch matrix enable signal is low.
- the programming mode may be enabled when the switch matrix enable signal is high.
- A/D sampling is implemented during the calibration mode.
- the current from the reference current source 94 is applied to the pixel circuit.
- the voltage on the data input node is converted to a digital voltage by the A/D converter 56 .
- current/voltage correction information is recorded at the lookup table.
- the Vt shift information is generated based on the data in the correction table 80 or the output from the A/D converter 96 .
- the system 82 of FIG. 12 may implement hidden refresh technique for refreshing current/voltage correction information in addition to the table lookup technique described above.
- new current/voltage correction information is constructed while completely hidden from user's perception.
- This technique utilizes the information that is currently displayed on the screen (i.e. the incoming video data).
- the current/voltage correction information for each pixel in the display is known.
- the current/voltage correction curve may shift due to the change in Vt.
- a new current/voltage correction curve is extrapolated from the point so that it is fitted to the measured point. Based on the new current/voltage correction curve, the Vt shift information is extracted which is used to compensate for the shift in Vt.
- FIG. 16 illustrates an exemplary flow chart for the hidden refresh operation of the system of FIG. 12 .
- a current/voltage correction curve is produced during the calibration process that is implemented during the manufacturing of the display (step S 62 ).
- FIG. 17 illustrates an example of a sample of the current voltage correction curve.
- the next step is to measure a point along the curve during the usage of the display.
- This point can be any point along the curve, so any data that the user currently has on the display can be used for calibration (step S 64 ).
- FIG. 18 illustrates the current voltage correction of FIG. 17 and an example of a newly measured data point.
- the last step is to shift the current/voltage correction curve to fit the point of voltage verses current relationship that is measured (step S 66 ).
- FIG. 19 illustrates an example of a new current voltage correction curve based on the measured point of FIG. 18 .
- FIGS. 17-19 The process associated with FIGS. 17-19 is implemented in the hybrid controller 98 of FIG. 12 .
- the system 82 of FIG. 12 may implement a combined current and voltage-programming technique.
- FIG. 20 illustrates one example of a hybrid driving circuit for implementing the combined current and voltage-programming technique.
- the hybrid driving circuit of FIG. 20 may be included in the hybrid driver 12 of FIG. 12 .
- the digital hybrid driving circuit 12 C and a current source 100 are provided to the data line DL of the pixel circuit.
- the pixel circuit programming is divided into two phases.
- the pixel circuit 10 A is voltage-programmed first to set the gate voltage of the driving TFT to an approximate value, then followed by a current programming phase.
- the current programming phase can then fine-tune the output current.
- the system of FIG. 20 is faster than current programming and has the compensation capabilities of the current programming scheme.
- the digital hybrid driving circuit 12 C is provided.
- the combined current and voltage-programming technique may be implemented by combining the hybrid driving circuit 12 A of FIG. 3 or 12B of FIG. 6 with the current source 100 .
- the current source 100 may be the reference current source 94 of FIG. 12 .
- the system 2 of FIG. 1 may implement the hidden refresh technique described above.
- the system 2 of FIG. 1 may implement the combined current and voltage-programming technique.
- the system 2 of FIG. 1 may include the hybrid driving circuit of FIG. 20 to implement the combined current and voltage-programming technique.
- the direct digital programming scheme ( FIGS. 6, 8 and 20 ) can be extended to drive an OLED array (e.g. a 4T OLED array) using voltage programmed column drivers, such as those used for driving Active Matrix Liquixd Crystal Display (AMLCD), or voltage-programmed Active-Matrix Organic Light Emitting Diode (AMOLED) displays, or any other voltage-output display driver.
- AMLCD Active Matrix Liquixd Crystal Display
- AMOLED Active-Matrix Organic Light Emitting Diode
- FIG. 21 illustrates a system for driving an AMOLED array having a plurality of pixel circuits in accordance with a further embodiment of the invention.
- the system 105 of FIG. 21 includes a voltage column driver 112 , a programmable current source 114 , a switching network 116 , an A/D converter 118 and a row driver 120 .
- the voltage column driver 112 is a voltage programmed column driver.
- Each of the voltage column driver 112 and the row driver 120 may be any driver that has a voltage output, such as those designed for the AMLCD.
- the voltage column driver 112 and the programmable current source 114 are connected to an OLED array 110 through the switching network 116 .
- the OLED array 110 forms an AMOLED display, and contains a plurality of pixel circuits (such as 10 of FIG. 1 ).
- the pixel circuit may be a current programmed pixel circuit or a voltage programmed pixel circuit.
- the A/D converter 118 is an interface that allows an analog signal (i.e. current driving the display 110 ) to be read back as a digital signal.
- the digital signal associated with the current can than be processed and/or stored.
- the A/D converter 118 may be the A/D converter 56 of FIGS. 8 and 20 .
- the column driver 112 may be the source driver 14 of FIGS. 1 and 12 .
- the system 105 of FIG. 21 implements the calibration mode and the display mode as described above.
- FIG. 22 illustrates an example of the switch network 116 of FIG. 21 .
- the switching network 116 of FIG. 22 includes two MOSFET switches 122 and 124 that can switch the column of the display ( 110 ) from connecting to the column driver ( 112 ) to the combination of the current source ( 114 ) and the A/D converter ( 118 ), and vice versa.
- a shift register 126 is a source of the digital control signal that controls the operation of the MOS switches 122 and 124 .
- An inverter 128 inverts an output from the shift register 126 . Thus, when the switch 122 is on (off), the switch 124 is off (on).
- the switching network 116 may be located either off the glass in the column driver ( 112 ) or directly on the glass using TFT switches.
- the system 105 uses only one current source 114 .
- the voltage-programming drivers (such as, AMLCD drivers, or any other voltage-output drivers) drive the rest of the display 110 .
- the switching matrix (switching network 116 ) allows different pixels within the array of pixels to be connected to a single current source ( 114 ) through a time division method. This allows a single current source to be applied to the entire display. This lowers the cost of the driver circuit and speeds up the programming time for the pixel circuit.
- the system 105 uses the A/D converter 118 to convert an analog output of the data node (e.g. DL of FIG. 2 ) of the pixel circuit to digital data.
- the conversion by the A/D converter 118 removes the requirements of having to acquire the Vt every programming cycle.
- the Vt of the pixel circuit may be acquired once every few minutes. Thus it may acquire one column of the panel every refresh cycle.
- Only one A/D 118 may be implemented for all the columns.
- the circuit acquires only one pixel per frame refresh. For example, for a 320 by 240 panel, the number of pixels is 76, 8000. For a frame rate of 30 Hz, the time required to acquire Vt from all pixels for the entire frame is 43 minutes. This may be acceptable for some applications, providing that Vt does not shift substantially in an hour.
- the parasitics only affect the amount of time to discharge the capacitor to acquire Vt. Since the circuit is voltage-programmed, it is not affected by the parasitics. Since Vt is only acquired one column per frame time, it can be long. For example, for a display with 320 columns that has a frame rate of 30 Hz, each frame time is 33 mS. For voltage programming, it is possible to program a pixel in 70 uS. For 320 columns, the time to update the display is 22 mS, which still leave 11 mS to complete a charge/discharge cycle.
- the system 105 may implement the lookup table technique to compensate for Vt shift and/or to correct the current/voltage information as described above
- the system 105 may implement the hidden refresh technique to acquire the Vt shift information and current/voltage correction information of each pixel circuit ( 10 ) in the display 110 .
- This current/voltage correction information is used to populate a lookup table (e.g. a correction table 80 of FIG. 12 ) that will then be used to compensate for the degradation in the pixel circuit, which is caused by aging.
- a lookup table e.g. a correction table 80 of FIG. 12
- the system 105 may implement the combined current and voltage-programming technique as described above.
- FIG. 23 illustrates a system for correcting the current/voltage information of the pixel circuit.
- a display 130 is depicted as a 2T or 4T OLED array.
- the display 130 may include a plurality of pixel circuits, each having three or more than four transistors.
- the display 130 may include voltage-driven pixel circuits or current-driven pixel circuits.
- the system of FIG. 23 is applicable to the systems 2 , 82 and 105 of FIGS. 1, 12 and 22 .
- a switch 132 is provided to disconnect the common electrode of the OLED. It is well known that two electrodes are provided for the OLED. One is connected to the pixel circuit, and the other is a common electrode connected to all OLEDs. It is noted that the common electrode may be Vdd or GND depending on the type of OLED.
- the switch 132 connects the common electrode of the OLED into a current sensing network 134 utilizing a high side common mode sensor (such as, INA168 by TI). The current sensing network 134 measures the current through the common electrode.
- each pixel is lit individually and the current consumed is acquired by the sensing network 134 .
- the acquired current is used to correct the lookup table (e.g. the correction table 80 of FIG. 12 ) populated by the direct digital hybrid driving circuit of FIG. 8 or 20 .
- a dark display current may be acquired to include the effect of dead pixel and leakage current of the array. During this procedure, all pixels are turned off, and the current (i.e. dark display current) is measured.
- the major issue with current-programmed pixel circuits which is the slow programming time, is solved.
- the concept of using feedback to compensate the pixel circuit enhances the uniformity and stability of the display while retaining the fast programming capability of the voltage programmed drive scheme.
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WO2006000101A1 (en) | 2006-01-05 |
EP1779365A4 (en) | 2009-12-16 |
US20080191976A1 (en) | 2008-08-14 |
EP1779365A1 (en) | 2007-05-02 |
USRE45291E1 (en) | 2014-12-16 |
EP2827323A3 (en) | 2015-04-08 |
US8115707B2 (en) | 2012-02-14 |
EP2827323A2 (en) | 2015-01-21 |
CN1977303A (en) | 2007-06-06 |
JP2008504576A (en) | 2008-02-14 |
US20120139894A1 (en) | 2012-06-07 |
CN102426822A (en) | 2012-04-25 |
JP5279265B2 (en) | 2013-09-04 |
EP1779365B1 (en) | 2018-10-10 |
CN1977303B (en) | 2012-02-08 |
US8232939B2 (en) | 2012-07-31 |
CN102426822B (en) | 2016-06-29 |
CA2472671A1 (en) | 2005-12-29 |
TW200603057A (en) | 2006-01-16 |
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