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WO1999038148A1 - Systeme d'affichage haute resolution a matrice active qui est monte sur puce, possede un coefficient d'utilisation eleve et permet d'assurer une luminosite maximale - Google Patents

Systeme d'affichage haute resolution a matrice active qui est monte sur puce, possede un coefficient d'utilisation eleve et permet d'assurer une luminosite maximale Download PDF

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Publication number
WO1999038148A1
WO1999038148A1 PCT/US1999/001223 US9901223W WO9938148A1 WO 1999038148 A1 WO1999038148 A1 WO 1999038148A1 US 9901223 W US9901223 W US 9901223W WO 9938148 A1 WO9938148 A1 WO 9938148A1
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WO
WIPO (PCT)
Prior art keywords
pixel
input data
voltage
analog
current
Prior art date
Application number
PCT/US1999/001223
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English (en)
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WO1999038148A8 (fr
Inventor
Olivier F. Prache
Webster E. Howard
Shashi Malaviya
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Fed Corporation
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 Fed Corporation filed Critical Fed Corporation
Priority to EP99903238A priority Critical patent/EP1055218A1/fr
Publication of WO1999038148A1 publication Critical patent/WO1999038148A1/fr
Publication of WO1999038148A8 publication Critical patent/WO1999038148A8/fr

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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
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    • G09G3/325—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
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Definitions

  • the present invention relates to flat panel displays.
  • the present invention relates to an active matrix display system on a semiconductor chip having a combination of a pixel cell and row/column driver that provide accurate, high resolution gray scale capability along with an almost 100% duty cycle for maximum light output.
  • the pixels in all the unselected 1023 rows are held in the "off " state while the peripheral circuit is processing, supplying, and sustaining the currents in the 1024 pixels of the selected row.
  • 1024 columns per row With 1024 columns per row. a further compromise is often made by subdividing the columns into much smaller groups of 8. 16, 32 or 64 pixels per group. The groups are fed with current sequentially so that the demand on the peripheral circuitry is reduced to handling only 8 to 64 pixels at any time.
  • a major disadvantage of this approach is that the active period of the pixels is reduced to a very small fraction of the frame period. To compensate for such a low duty cycle, the magnitude of the input current is increased by a correspondingly large number, if the pixel can tolerate it. However, the maximum current limit of the pixel is often exceeded in the process and the net result is a significant reduction in the overall brightness level.
  • the gray levels have to be changed at the frame rate. i.e.. sixty times per second or faster.
  • the circuit must therefore be capable of maintaining the integrity of the gray levels in an environment of high-speed switching. For displays using color, the time available is further reduced by one-third.
  • a second factor affecting gray level resolution is voltage drop.
  • the gray level analog output voltage of a driver reaches a pixel after travelling through switching transistors and long, thin, sub-micron wide interconnecting lines, including the row/column lines.
  • the total voltage drop in the connecting lines is therefore variable and another source of error.
  • the error is reduced if the pixel cell can be designed with at least one of its terminals connected directly to the relatively thick power supply or ground bus.
  • a third factor affecting gray level resolution is leakage currents.
  • a selected row line is connected to 1023 unselected columns and one selected column.
  • Each column has at least one NFET (or PFET) terminal tied to every row line. If the NFET or PFET has, e.g., lpA, of leakage current, the total leakage current fed to the row will be 1024 pA which may not be negligible. Also, the leakage currents are highly thermally sensitive and unpredictable. 4. Process and Power Supply Tolerances
  • a fourth factor affecting gray level resolution is process tolerances.
  • the voltage generated by the D/A converter will be sensitive to the normal process tolerances and ambient temperature. 5. Large Peak Currents
  • a fifth factor affecting gray level resolution is large peak currents. Simultaneous switching of all the 1024 pixels in a row generates large peak currents in the associated circuits.
  • the corresponding transient voltage changes in the power supplies can introduce significant error in the input data to the pixels. Simultaneous switching can also damage the pixels and even other parts of the chip.
  • Capacitor C may be tied across the source (Vdd) and the gate of the transistor in order to hold the gate at the desired voltage level. If the capacitor is charged to 4 Volts by the external circuit to feed a relatively large current (e.g. 10 micro-amps) into the pixel, the net gate voltage will be 5-
  • the Vdd supply may be pulled down to +4.5 Volts due to large peak currents at the time of charging the capacitor to 4 Volts.
  • the gate voltage will pull back to less than +1 Volt due to parasitic capacitances associated with the gate.
  • the actual gate voltage will lie somewhere between + 1 Volt and +0.5 Volt, depending upon the ratio of capacitor C to the total parasitic capacitances. The net result is that the gate settles down to a voltage more negative than intended.
  • a P-type transistor its output current increases exponentially as the gate becomes more negative, thus the current fed to the pixel will be much higher than intended.
  • a similar situation may also arise with N-type transistors.
  • Applicants have developed an innovative, economical active matrix display device having a plurality of pixels arranged in a matrix.
  • the display device may receive either digital or analog input data from a peripheral circuit.
  • the innovative display device of the present invention comprises means for directing the analog input data to a pixel driver circuit for at least one of the plurality of pixels; means for rapidly transmitting the analog input data, connected to the directing means: means for storing the analog input data, connected to the directing and transmitting means: means for drawing an analog current through a pixel, wherein the analog current corresponds to the analog input data and the drawing means are connected to the storage means, and whereby the pixel emits light output of intensity proportional to the analog current.
  • the device may further comprise means for converting the digital input data to analog input data.
  • the converting means further comprises at least one digital-to-analog converter which may be connected to the peripheral circuit and to the directing means.
  • the directing means of the display device further comprises at least one column line and at least one row line.
  • the transmitting means of the display device further comprises a line driver which may function initially as a low impedance voltage driver to charge up a data line to a new input voltage, then may automatically convert to a high impedance current driver.
  • the storage means of the display device further comprises a capacitor having a first end and a second end.
  • the drawing means of the display device further comprises a transistor connected to a strobing control line. The transistor may simultaneously activate the plurality of pixels.
  • An innovative method of driving a pixel in an active matrix display comprises the steps of supplying either digital or analog input data from a peripheral circuit; directing the analog input data to a pixel driver circuit for a pixel; transmitting the analog input data rapidly; storing the analog input data; drawing an analog current through the pixel, wherein the analog current corresponds to the analog input data, and whereby the pixel emits light output of intensity proportional to the analog current.
  • the method of driving a pixel further comprises the step of converting the digital input data to analog input data.
  • the method of driving a pixel may further comprise the steps of using a linearizing impedance to enhance the gray level rendering accuracy of the light output of the pixel and adjusting the input data to compensate for ambient temperature, pixel threshold voltage and transistor threshold voltage.
  • the step of rapidly transmitting the analog input data may further comprise providing a line driver that functions initially as a low impedance voltage driver to charge up a data line to a new input voltage, then automatically converts to a high impedance current driver.
  • Fig. 1 is a schematic diagram of a pixel driver circuit with a linearizing resistor according to an embodiment of the present invention.
  • Fig. 2 is a schematic diagram of a pixel circuit driver for pulse modulation according to an alternate embodiment of the present invention.
  • Fig. 2a is a graph depicting ramp voltage as a wave form.
  • Fig. 3 is a schematic diagram of a pixel driver circuit suitable for analog input according to an alternate embodiment of the present invention.
  • Fig. 4 is a schematic diagram of a known digital-to-analog converter with voltage output suitable for voltage-driven pixel cells of the present invention.
  • Fig. 5 is a schematic diagram of a known digital-to-analog converter with current output suitable for current-driven pixel cells of the present invention.
  • Fig. 6 is a schematic diagram of a pixel driver circuit with combined current and voltage drivers suitable for analog input according to an alternate embodiment of the present invention.
  • Fig. 7 is a schematic diagram of a voltage driver circuit according to an alternate embodiment of the present invention.
  • Fig. 8 is a schematic diagram of a pixel driver circuit suitable for analog input according to a preferred embodiment of the present invention.
  • N-channel Field Effect Transistor N-FET
  • P-channel Field Effect Transistor P-FET.
  • a voltage level of +5 Volts is assumed for the logic "1 " and 0 Volts is assumed for the logic "0". The voltage level could also be 3.3 Volts and 0 Volts, or any other reasonable set of voltages.
  • a node is "up” if it is at +5Volts and "down” if it is at 0 Volts.
  • a standard 5 Volts (or 3.3 Volts) CMOS process is assumed to be used in the fabrication of the chip for the present invention.
  • junction breakdown voltage in the silicon is at least 10.7 Volts. Voltage may be readjusted if a junction breakdown is different from 10.7 Volts.
  • the display panel circuitry of the present invention is sub-divided into the following sub- circuits: Pixel Cell; Pixel Circuit; Digital-to-Analog (D/A) Circuit; and Row and Column Drivers. 1. Pixel Cell; Pixel Circuit; Digital-to-Analog (D/A) Circuit; and Row and Column Drivers. 1.
  • the light-emitting pixel is processed after the silicon chip containing all the other circuit elements has been manufactured using a standard CMOS (Complimentary Metal Oxide Semiconductor) process.
  • the pixel may consist of two or more transparent (or semi-transparent) organic layers which form the anode, the cathode and power supply electrodes of the pixel.
  • Pixel cell circuits are of two basic types, voltage-driven or current-driven.
  • a voltage- driven pixel receives its brightness input data from the peripheral circuit in the form of an analog voltage
  • a current-driven pixel receives its brightness input data from the peripheral circuit in the form of an analog current.
  • input data may be used for charging up the capacitor to an analog voltage level appropriate for the corresponding gray level output from the pixel.
  • the charge on the capacitor may be used for sustaining a steady and continuous light output at that level even after the peripheral circuit is disconnected from the pixel.
  • the charge on the capacitor may be used to control the number of input pulses fed to the pixel to obtain the desired total light output from it.
  • a simple voltage-driven pixel cell circuit is shown as 10.
  • Analog input data are fed to capacitor C 110 using conventional column select transistor Q 1 210 and row select transistor Q2 220.
  • the capacitor voltage is applied to gate 231 of third device Q3 230 whose drain 233 is connected to a suitable positive voltage +V while source 232 is connected to anode 101 of pixel 100.
  • Cathode 102 of pixel 100 is grounded through resistor R 310 which helps to linearize pixel 100 light output vs. input voltage characteristics.
  • the input voltage can therefore be made directly proportional to the desired light output after compensating for the threshold voltage drops in pixel 100 and Q3 230 by the addition of a fixed voltage to the analog input.
  • Errors due to threshold voltage drops in Ql 210 and Q2 220 can be almost eliminated by changing Ql 210 and Q2 220 to P-type devices and making the minimum input voltage more positive than the threshold voltages of Ql 210 and Q2220. The polarity of the gate voltages will be reversed for the P-devices.
  • Resistor R 310 may be omitted (shorted out) by proper pre-compensation of the input data to account not only for the threshold voltage drops but also for the non-linear characteristics of the pixel.
  • Circuit 10 may be modified for use as a pulse modulated pixel circuit.
  • pulse modulated pixel circuit 20 is shown.
  • input data are received as a series of discrete narrow pulses applied to the "Ramp" terminal 140.
  • Each successive pulse adds extra charge to capacitor C 110.
  • the final voltage of capacitor C 110 therefore depends upon the number of input pulses; the pixel brightness varies accordingly.
  • the effects of threshold drops in pixel 100 and Q3 230 must be pre-compensated by the peripheral circuitry to obtain high gray level resolution.
  • capacitor C 110 may be charged up to the desired voltage level by an analog voltage applied to "Data" terminal 150 when both the "Row" 120 and
  • “Ramp” terminal 140 is supplied with the ramp waveform shown in Fig. 2a.
  • the voltage on the "Ramp” line is normally held at 0V and is raised linearly to a suitable higher voltage e.g., +4V. for a given time before being brought down quickly to 0V again. After a brief pause, the cycle is repeated.
  • the frequency of the ramp voltage depends upon the input data rate.
  • the shape of the ramp voltage may be optimized for a given application, based on the device and pixel characteristics. Assuming that the threshold voltages of Q3 230 and pixel 100 add up to 4V, circuit 20 operates as follows: when input data on column line 130 equal 0V. capacitor C 110 is charged to 0V by the input data. As the ramp voltage rises, the gate voltage of Q3 230 rises with it, while the voltage across capacitor C 110 remains nearly constant at 0V. The peak voltage on the gate
  • FIG. 3 Current-driven pixel cell circuit is shown in Fig. 3 as 30.
  • anode 101 of pixel 100 is tied to the + 15V supply and cathode 102 is tied to drain 243 of device Q4240.
  • Device Q4 240 is preferably on N-FET.
  • Gate 241 of Q4 240 is tied to "-Row" control line 142.
  • Source 242 Q4240 is tied to drain 213 of device Ql 210.
  • Device Ql 210 is preferably an N-FET.
  • Source 212 of Ql 210 is grounded and gate 211 of Ql 210 is tied to first end 111 of capacitor C 110. Second end 112 of capacitor C 110 is also grounded.
  • Source 222 of device Q2 220 is also tied to gate 211 of Ql 210, gate 221 of Q2220 is tied to external control line "Str" 141 and drain 223 of Q2 220 is tied to drain 213 of Ql 210 as well as to drain 233 of device Q3 230.
  • Gate 231 of Q3 230 is tied to control line "Row” and its source 232 is tied to 30 column line "Col” 130.
  • Devices Q2 222 and Q3 230 are preferably N-FETs.
  • Circuit 30 operates as follows: initially, Q4240 is switched off by bringing down "-Row" line 142. Simultaneously, row line 120 goes up to turn on Q3 230 so that the input analog current supplied by the column line 130 flows through Q3 230. thus raising the voltage on the node connective drains 333, 223 and 213. Control line "Str" 141 is also up at this time so that Q2 220 is conducting and the voltage on the node connecting drains 233, 223 and 213 charges up capacitor C 110 which then turns on Ql 210 so that all the input current passes through Ql 210 to ground and an equilibrium is reached.
  • control line "Str” 141 is brought down to turn off Q2220. thereby isolating capacitor C 110 from the external lines. The charge on capacitor C 110, however, remains unaffected.
  • row line 120 is brought down to turn off Q3 230 and simultaneously "-Row" line
  • the threshold voltages of the devices do not impact the current fed to pixel 100 and the gray level accuracy is therefore well maintained. In practice, however, the inter-electrode capacitances of the devices and their leakage currents do affect the pixel current unless the storage capacitor is big enough to make the resulting error negligible.
  • Digital-to-Analog converter 40 (D/A convener) with voltage output is shown in Fig. 4.
  • the eight digital input data lines are connected to the gates of eight transistors, their sources are tied to ground through series resistors with values ranging from R/l 6 to 8R, where R is a resistor value consistent with the circuit requirements.
  • R is a resistor value consistent with the circuit requirements.
  • the total current flows through resistor Rl so that the voltage available at the output terminal (source) of the output device 41 is the analog equivalent of the digital input except for the voltage drop due to the threshold voltage of device 41 which needs to be compensated for.
  • Digital-to-Analog converter 50 with current output is shown in Fig. 5.
  • D/A converter Digital-to-Analog converter
  • Row and Column Driver Circuits Applicants have designed an innovative "line driver" circuit which combines the attributes of a voltage driver and a current driver to provide fast and accurate delivery of the analog output of a D/A converter to the pixel cells.
  • the following description of a "line driver” is equally applicable to both a row driver and a column driver.
  • the D/A converter provides an accurate analog output at its output terminal.
  • the D/A converter since the D/A converter is located on the chip along the periphery of the pixel array, the D/A output has to pass through relatively long and thin row/column lines and several active devices to reach pixel 100. Because a voltage line driver has low output impedance, it may charge up the line relatively quickly, but there will be voltage drops in the devices and the interconnecting long lines so that some of the output voltage will be lost it transit, resulting in significant error in the pixel output. Thus, high speed is gained at the cost of gray level error.
  • a current driver If a current driver is used, however, the current reaching pixel 100 at the end of the interconnecting lines will be the same as the output current of the D/A converter (except for leakages and transient capacitance charge up currents which are ignored here).
  • Current drivers have very high output impedance, increasing the time taken to charge up the line to the final value. Thus, gray level accuracy is gained at the cost of speed.
  • Applicants' innovative driver acts as a voltage driver initially, with low output impedance, to charge up the line quickly to nearly the final voltage level, so speed is gained. Then the circuit automatically converts itself into a current driver to ensure that the current at the pixel end is the same as the D/A output current, so accuracy is gained.
  • Applicants' design thus supplies the best of both types of drivers without the drawbacks of either. Referring now to Fig. 6, a combined current and voltage driven circuit is shown as 60.
  • D/A converter 50 (current output type) is modified to obtain two identical output current sources, first output current source Jl 161 and second output current source, J2 162. by adding an extra P- FET device (not shown in Fig. 5) in parallel with device 52.
  • the output of second current source J2 162 is fed to gate 211 and drain 213 of a local N-FET device Ql 210.
  • Ql 210 corresponds to device Ql 210 of Fig. 3. Drain 212 of local device Ql 210 is grounded. Since the Ql 210 devices of Figs. 3 and 6 are identical, the voltage developed at gate 211 of Ql 210 of Fig. 6 is such that, if applied to gate 211 of Ql 210 of Fig. 3, the current in drain 212 of Ql 210 of Fig. 6 will be equal to the current in second output current source J2 162.
  • first output current source Jl 161 is tied to gate 231 of device Q3 230 and it is also tied to column line 130 of Fig. 3 to provide accurate current input to pixel 100, even though it will be a slow process.
  • Devices Q2 220 and Q3 230 form a differential amplifier, with Q5 250 as its current source. The magnitude of the current is controlled by resistor Rl 310 and device Q4240. Drain 223 of Q2220 is tied to the +5V supply through load resistor R2320. Drain 233 of Q3 230 is also tied to the +5V supply through second load resistor R3 330. which is identical to first load resistor R2 320.
  • Voltage driver 70 comprises: N-FET device Q5 250 with source 252 connected to input node “A” 173, gate 251 connected to input node “B” 174 and drain 253 to gate 271 of P-FET device Q7 270.
  • Input node "A" 173 is also connected to source 262 of a P-FET device Q6 260, whose gate 261 is tied to input node “B” 174 and whose drain 263 is tied to gate 281 of N-FET device Q8 280.
  • Source 282 of Q8 280 is grounded and its drain 283 is connected to column line 130.
  • Gate 281 of Q8 280 is also grounded via resistor R5 350.
  • Source 272 of Q7270 is tied to the +5V supply and its drain 273 is tied to column line 130.
  • Gate 271 of Q7 270 is tied to the +5V supply through resistor R4 340. In some cases, it may be desirable to replace the two resistors with small current sources.
  • Voltage driver 70 operates as follows: if Vdiff is greater than a threshold voltage (assumed to be O Volts hereafter), with input node “A" 173 more positive than input node “B” 174. the P- FET device Q6 260 conducts. The voltage on gate 281 of Q8 280 rises to the voltage level of input node "A" 173 and device Q8280 therefore conducts to lower the voltage of column line 130. Because Q5 250 is off, Q7 270 is also off during this time. As a result of bringing down the voltage of column line 130, Vdiff falls below 0.7 Volts, thereby turning off both Q6 260 and Q8
  • Q5 250 and Q7 270 continue to remain off so that all the devices are off and the driver is completely off with high output impedance at column line 130.
  • anode 101 of pixel 100 is tied to the +15Volts power supply whereas cathode 102 is tied to drain 243 of N-FET device Q4240.
  • Gate 241 of Q4240 is tied to external control line "-Row" 142.
  • Source 242 of Q4240 is tied to drain 213 of N-FET Ql 210 at node E 175.
  • Gate 211 of Ql 210 is tied to first end 111 of storage capacitor C 110.
  • Source 212 of Ql 210 is grounded.
  • Second end 112 of capacitor C 110 is also grounded.
  • a third N-FET Q2 220 has its drain 223 connected to drain 213 of Ql 210.
  • Gate 221 of Q2 220 is tied to external strobing control line "Str" 141.
  • Source 222 of Q2 220 is tied to gate 211 of Ql 210.
  • N-FET Q3 230 has its drain 233 tied to drains 213 and 223 of Ql 210 and Q2 220.
  • Gate 231 of Q3 230 is tied to row line 120.
  • Source 232 of Q3 230 is tied to column line 130.
  • a fifth N-FET Q5250 has its gate 251 and drain 253 tied to cathode 102 of pixel 100.
  • Source 252 of Q5 250 is tied to an external +10Volts power supply.
  • Circuit 80 operates as follows: When transistors Q4240 and Q5 250 are off pixel, current is zero and pixel 100 is turned off. Cathode 102 of pixel 100 will therefore tend to rise to +15Volts to reduce the voltage difference between the anode and cathode to zero, the normal condition for turning off a pixel. Because cathode 102 of pixel 100 is tied to drain 253 of transistor Q5 250 and also to drain 243 of Q4 240, the drain voltages will also rise to +15Volts, which exceeds the breakdown limit of 10.7 Volts in the silicon chip. Such a high voltage is unacceptable, thus transistor Q5 250 has been added to the circuit.
  • pixel 100 may also be turned on. Initially, row line 120 is up so that Q3 230 is on its complement line “-Row" 142 is down so that Q4240 is off. Strobing control line "Str" 141 is up so that Q2220 is on.
  • column line 130 is primed by the associated pixel driver to supply the desired current from the pixel e.g., 1 micro-amp.
  • the desired current from the pixel e.g., 1 micro-amp.
  • the voltage there rises (goes more positive) and because Q2 220 is on, the current starts to charge up capacitor C 110.
  • Q2220 may be turned off by bringing down strobing control line "Str" 141.
  • the input data are strobed and used to charge up gate 211 of Ql 210 to the correct level to draw 1 micro-amp current.
  • strobing control line "Str" 141 is brought down to turn off Q2 220 and isolate capacitor C 110 from node G 177.
  • Transistor Ql 210 continues to draw 1 micro-amp from column line 130 through Q3 230.
  • row line 120 is brought down and its complement, control line "-Row" 142, is brought up.
  • the current drawn by Ql 210 is now diverted from column line 130 to pixel 100 through transistor Q4 240.
  • Pixel 100 continues to remain lit with 1 micro-amp current, irrespective of the condition of column line 130, which may change its current level to some other value for feeding the next pixel in the row.
  • first row line 120 and first column line 130 are selected and condition the associated pixel driver 80 to deliver the current for the first pixel to the column line 130.
  • Strobing control line "Str” 141 is turned on when column line 130 is ready with the data and capacitor C 110 is charged up to the correct level by the input current.
  • strobinhg control line "Str” 141 is brought down to free column line 130 for serving the next pixel in the row.
  • Pixel 100 continues to be lit with the current fed to it. The process is repeated to cover all the pixels in the row. after which the process is repeated by selecting the next row and so on until all the pixels in the panel are lit with the correct input currents. When data arrive for the next frame, the whole process is repeated. This completes the operating sequence of circuit 80 of the present invention.
  • Pixel 100 is current driven, thus the input data to pixel 100 are supplied in the form of an analog current, not voltage.
  • circuits of the present invention may be used in the circuits of the present invention, resulting in similar circuits with different combinations of - and P-type Field Effect

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Abstract

L'invention a pour objet un dispositif d'affichage à matrice active. Le dispositif d'affichage comprend des circuits d'attaque individuels pour chaque pixel (100) qui permettent d'assurer un rendu précis haute résolution des niveaux de gris, et ce avec un coefficient d'utilisation avoisinant les 100 %. Les circuits d'attaque des pixels (Fig. 6, 60 et Fig. 7, 70) réduisent au minimum les facteurs qui sont responsables de la baisse de résolution des niveaux de gris, par exemple, les variations de la tension de seuil, les chutes de tension se produisant dans des lignes de connexion et provoquées par des courants de perte ainsi que les courants de crête importants. La présente invention comprend un circuit d'attaque de ligne qui fonctionne initialement comme un circuit d'attaque de tension à basse impédance (Fig. 6, 60) puis comme un circuit d'attaque de courant à impédance élevée. L'invention concerne également un procédé pour commander un pixel (100) avec des circuits suffisants pour soutenir l'émission lumineuse du pixel à un niveau de gris déterminé par les données d'entrée qui alimentent ledit pixel (100). Le dispositif d'affichage peut traiter des données d'entrée numériques ou analogiques.
PCT/US1999/001223 1998-01-23 1999-01-22 Systeme d'affichage haute resolution a matrice active qui est monte sur puce, possede un coefficient d'utilisation eleve et permet d'assurer une luminosite maximale WO1999038148A1 (fr)

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EP99903238A EP1055218A1 (fr) 1998-01-23 1999-01-22 Systeme d'affichage haute resolution a matrice active qui est monte sur puce, possede un coefficient d'utilisation eleve et permet d'assurer une luminosite maximale

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