TWI263195B - Brightness adjusting circuit of organic light emitting diode display - Google Patents

Abstract

Disclosed is a brightness adjusting circuit of an organic light emitting diode display, which uses a switch control to output an adjustment signal, and a driver IC is used to adjust the brightness of the display, comprising a switch used to output a control signal, a clock generating unit used to output a reference clock, a clock pickup unit connected to the switch and the clock generating unit to receive the control signal and the reference clock to output a pickup clock signal, a clock counting unit connected to the switch and the clock pickup unit to receive the control signal and the pickup clock signal to output a digital counting signal, and a signal conversion unit connected to the clock counting unit to receive the digital counting signal and convert it as the output adjustment signal.

Description

1263195 V. INSTRUCTION DESCRIPTION (1) Technical Field of the Invention A brightness adjustment circuit for an organic light emitting diode display, in particular, an organic light emitting diode display, which is controlled by a switch to output a tone The school signal is then adjusted by a driver integrated circuit to adjust the brightness of the display. [Prior Art] Please refer to the first figure, which is an internal circuit diagram of a conventional organic light emitting diode display. The display 30 has a plurality of scan lines (Sb, S3, S4, S5) and a plurality of data lines (Db D2, D3, D4, D5) and a pixel array 3002, wherein each pixel is a Organic light-emitting diodes, and the organic light-emitting diodes are subjected to the scan lines (S1, S2, S3, S4, S5) and the data lines (Db D2, D3, D4, D5) ) Driven control. The display 30 includes a data line driving chip 306 and a scan line driving chip 340. The stock line driving chip 306 is used to supply the tribute signals to the data lines (Db D2, D3, D4, D5), respectively. The scan line driving chip 104 transmits scan signals to the scan lines (SI, S2, S3, S4, S5) in a sequential scan mode or an interlaced scan mode, respectively. With the first figure, please refer to the second figure, which is a waveform diagram of the organic light-emitting diode using the constant voltage and the constant current to adjust the brightness, wherein the scan lines (Sb S2, S3, S4, S5) are connected to At the negative (N) extreme of the organic light-emitting diodes 4, the data lines (Db, D3, D4, D5) are connected to the positive (P) terminals of the organic light-emitting diodes. Therefore, when the scanning signal S of the scanning line S 1 is low and the tributary signal of the tributary D 1 is high, the organic light emitting diode P 1 is based on the data signal of the data line D 1 .

Page 5 1263195 V. Description of the invention (2) is the amount of current I flowing or the voltage V at both ends to perform the light-emitting operation. Referring to the second figure, the scanning signal S is low at time 11~t 2 . At this time, if the current amount I is increased by ΔI, the brightness of the organic light emitting diode is relatively increased, and vice versa, the current amount I is decreased. Then, the brightness of the organic light-emitting diode will decrease. This brightness adjustment method is a constant current adjustment method. Furthermore, as shown in the second figure, the scanning signal S is low at time 11~t 2 , and at this time, if the voltage V across the organic light-emitting diode is increased by ΔV, the brightness of the organic light-emitting diode is It will be relatively enhanced. Conversely, if the voltage V at both ends is reduced, the brightness of the organic light-emitting diode will decrease. This brightness adjustment method is a constant voltage calibration method. Please refer to the third figure, which is a waveform diagram of the organic light-emitting diode using the scanning signal to adjust the brightness. The current amount I of the organic light-emitting diode or the voltage V at both ends is fixed, and the duty cycle of the scan signal S is adjusted when the data signal current I or the voltage V at both ends is fixed. It is used to adjust the on-time of the organic light-emitting diode to achieve the adjustment of brightness. As shown in the third figure, the duty cycle (D utycyc 1 e) of the first scan signal SA is greater than the duty cycle of the second scan signal SB (Duty eye 1 e), thus, the data signal current amount I or the voltage across the two ends When V is fixed, the scanning signal SA with a small duty cycle has a shorter on-time of the organic light-emitting diode, so the brightness is weaker. Conversely, the scanning signal p-number SB with a large duty cycle has its organic light-emitting diode turned on. The time will be longer, so the brightness is stronger. Therefore, the above-described organic light-emitting diode brightness adjustment method is called a scan period adjustment method. [Summary of the Invention]

Page 6 1263195 V. Inventive Description (3) In view of the above, the brightness adjustment circuit of the organic light emitting diode display of the present invention outputs a calibration signal to a driving integrated circuit by the brightness adjusting circuit, the driving The integrated circuit is used to adjust the brightness of an organic light emitting diode display according to the calibration signal. A brightness adjustment circuit for an organic light emitting diode display according to the first embodiment of the present invention is connected to a switch and a clock generation unit by a clock extraction unit, and the clock extraction unit simultaneously receives one of the switch outputs. The control signal and the clock generated by the clock generating unit are reference clocks, and after performing an AND operation, a clock signal is output. A clock counting unit, connected to the switch and the clock capturing unit, receives the control signal and the captured clock signal for outputting a digital counting signal. At the same time, a digital/analog conversion unit is connected to the clock counting unit to receive the digital counting signal and convert the digital counting signal into a supply power for providing a driving product connected to the digital/analog conversion unit. The body circuit is used to perform light-emitting display of the organic light-emitting diode display. In the above description, the driving integrated circuit is a data line driving chip. As described above, the present invention further has a delay circuit connected to the digital/analog conversion unit and the driving integrated circuit, and is powered by the digital/analog converting unit. Used for charging/discharging, when the control signal of the switch output is cut off, the discharge time effect of the RC circuit is utilized, so that the organic light emitting diode display does not become dark immediately, but gradually becomes dark through discharge. A brightness adjustment circuit for an organic light emitting diode display according to the present invention,

Page 7 1263195 V. Inventive Description (4) The second embodiment is connected to a switch and a clock generation unit by using a clock capture unit, and the clock capture unit simultaneously receives a control signal from the switch output. The clock generation unit generates a reference clock of the output, and after performing an AND operation, outputs a capture clock signal. A clock counting unit, connected to the switch and the clock capturing unit, receives the control signal and the captured clock signal for outputting a digital counting signal. At the same time, a multiplexer is connected to the clock counting unit and a pulse width generating unit to receive the digital counting signal and the at least one scanning signal, and select one of the scanning signals according to the digital counting signal. Scanning signal output, the output scanning signal is transmitted to the driving integrated circuit for light-emitting display of the organic light-emitting diode display. In the above description, the drive integrated circuit is a scan line drive wafer. [Embodiment] Please refer to the fourth figure, which is a block diagram of the circuit architecture of the present invention. The brightness adjusting circuit 10 of the organic light emitting diode display of the present invention is connected to a driving integrated circuit 20, and the driving integrated circuit 20 is connected to an organic light emitting diode display 30. In addition, the brightness adjustment circuit 10 outputs a calibration signal to the driving integrated circuit 20 for providing the driving integrated circuit 20 to adjust the information required when the organic light emitting diode display 30 emits light. The signal or the scanning signal. In the above, the tuning signal is a data signal for supplying power or at least one scanning signal. The data signal is the amount of current or the voltage across the organic light-emitting diode. Please refer to the fifth figure, which is a schematic diagram of a circuit block of the present invention. The brightness adjustment circuit 10 of the present invention comprises: a switch 1 0 0, a clock generation unit

Page 8 1263195

1 Ο 2. One clock acquisition unit 丨〇 4. Conversion unit 1 0 8. One clock counting unit 1 〇6 and one signal one 3 ί8, referring to the fifth figure, the clock capturing unit 104 is a receiver: it is connected to the switch 100 and the clock generating unit 102, and is connected =幵3 1 00 outputs one of the control signals cS and RS by the clock generation unit i 〇2. As shown in the eighth figure, when the time is ~Η,

^ V 2 70 4 simultaneously obtains the control signal cS and the reference clock RS tfl # (AND) and the logical operation, and then outputs a capture clock k "takes the k pulse signal, which is transmitted to the connection at that time Pulse ==2 ,, pulse counting unit 1〇6, clock counting unit 106 will receive the bit 蚪 ^ pulse signal GS, and perform digital counting to output a number: y, via clock counting The unit 1 〇6 counts the result and outputs it, and the bit count 传送 is transmitted to the apostrophe conversion unit 1〇8' connected to the clock counting unit 1 (10) for signal conversion. 6 is a block diagram of a circuit of a t-signal conversion unit according to a first embodiment of the present invention, wherein the 'signal conversion unit 10' is a digital/analog conversion unit 1 〇8 0 connected to a delay circuit 丨〇8 2 , which is composed of a digit The analog/analog conversion unit 1080 is connected to the clock counting unit 1〇6, and receives the digital counting signal output by the clock counting unit 1〇6 in the above description. Moreover, the digital/analog conversion unit 1〇8 is based on a reference power supply (not marked), count the digits The number is converted into a supply of power, which is supplied through a delay circuit 1 082 for use by the driver integrated circuit 20 connected to the extension 1 082. At the same time, the delay circuit 1 〇 82 is misdirected by the supply. Electricity for charging/discharging, the delay

1263195 ---------- V. Invention Description (6) ""~' The road system is an RC circuit. With the fifth, sixth and eighth figures, please refer to the ninth figure, which is a schematic diagram of the waveforms of the step voltage and the delay time according to an embodiment of the present invention. When the time is to~tl, the clock capture unit 1〇4 simultaneously receives the high-potential control signal CS sent by the switch 1 and the reference clock output by the clock generating unit 1 〇2, and The control signal CS and the reference clock RS are ANDed logically output and output the clock signal GS to the clock counting unit! 〇 6. Clock Count ^ Yuan 1 0 6 is the counting of the captured clock signal GS, to output the digit count δίΐ to the digit/analog conversion early 1 Q 8 〇, digit/analog conversion unit 1 0 8 0 The reference power supply (not shown) is used to convert the digital count signal into an analog supply power to provide a drive integrated circuit 2 〇. At the same time, the analog power supply can be charged through the delay circuit 1 〇 8 2 at time t 0~11. As shown in the ninth figure, at time t 〇 〜 t "Temple, the voltage of the supplied power is raised from V0 to Vp to provide the drive integrated circuit 20 for use, so that the drive integrated circuit 20 can be based on the voltage of the supplied power. The size is used to drive the organic light emitting diode display 30 connected to the driving integrated circuit 2 (as shown in the fourth figure), and adjust the display brightness of the organic light emitting diode display 30. In the above description, when When the time is 11~12, the switch 1 〇0 sends a low-potential control signal CS. At this time, the clock signal GS of the output of the clock acquisition unit 1 〇4 is low, so the digital/analog ratio is transmitted. The analog supply power of the conversion unit 1 〇 8 〇 conversion output is zero. Therefore, at time 11 to 12, the delay circuit 1 0 8 2 stops the charging operation, and starts the discharging operation. Thus, the driving integrated circuit 20 is supplied. Supply of power, with delay circuit 1 〇 8 2

Page 10 1263195 V. The invention describes (7) the discharge operation, and outputs a delayed supply of power from Vp to "discharge time td". At this time, the discharge time is a delay time. In the above description, The discharge operation of the delay circuit 1〇82 is such that when the control signal CS outputted by the switch 100 is turned off, the organic light-emitting body display 30 does not become dark immediately, but is discharged with the discharge time. Falling down, and gradually dimming. With reference to the figure, please refer to the seventh figure, which is a block diagram of the circuit of the signal conversion unit according to the second embodiment of the present invention, wherein the signal Han Han Yuan 1 〇 8 is - multi... The m-connected pulse width generating unit is connected to the clock counting unit 106, and receives the above-mentioned generating unit: = 106 output digital counting signal and pulse width number system:: : / raw scanning signal Wherein, the digital counting signal 4 rotates the _ 位 bit signal, and the pulse width generating unit pairs the scanning signals. At the same time, the multiplexer ι_ is a 2 η 1 1 1 8 8 6 , ί to t; try the digital information of the Γ bit The system transmits a scan signal output to the scanning signal, and one of the f scanning signals, and the channel 20 uses Γ 隹js for the light-emitting display of the driving integrated body connected to the multiplexer 1 0 8 6 \Performing the organic light-emitting diode display 30 (as shown in the fourth figure) Scanning signal diagram Referring to the tenth figure, the scanning of the second embodiment of the present invention is "wave-opening;:=ίίΪ pulse width generating unit 1 scanning The signal (c〇, C1: c2 (cycle) size, and the output 2η is given by the above m _ C2 ··· Cm) to the multiplexer ι 8 6 . At the same time, by 'Zhu Mingzhong, the clock counting unit 1 0 6 outputs the digit of the η bit

1263195 V. Description of invention (8) ^ Xigong Yi 1〇86' is used to select the sweep signal (c〇, n, c2...cm) of different duty cycle (c〇, n, c2...cm) to drive the integrated body ^ j 〇 . The driving integrated circuit 20 is configured to adjust the brightness of the light-emitting display of the organic light-emitting diode display ^3 〇 (as shown in the fourth figure) according to the duty cycle of the scanning signal. As shown in the tenth figure, scan the signal. The duty cycle of 1 C 2··· C in is D = 1, ^ 1/2, D =, 1/4, and D = 1/2 m, respectively. . Above, 'When the data Λ1 (current setting or voltage value) of the organic light-emitting diode display 30 is fixed, the organic light-emitting diode is not displayed, and the brightness of the light-emitting diode (such as the fourth picture) is It is determined by the size of the duty cycle of the scan signal ("Λ CyCU). Duty cycle Small * 汛 ,, its organic light-emitting diode display 3 Ο (such as the fourth picture) ^ ^ 曰 曰 曰 , , , , , , , , , , , , , , , , , , , , 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任 责任Large scanning signal, its organic light-emitting diode display 3 〇 (such as the four brothers) will have a longer turn-on time, so the brightness is stronger. With reference to the fifth and seventh figures, the eighth embodiment and the tenth embodiment, the second embodiment of the present invention can obtain the digital signal of the _ element through the length of the control signal CS outputted by the switch 100. The multiplexer 1 08 6 selects and outputs the corresponding scan signal to the drive integrated circuit 2 〇 for illuminating according to the duty cycle of the sweep (Duty cycU), and the illuminant display of the polar body display, 30 (as shown in the fourth figure): degree. :t所: 可本: A brightness adjustment of an organic light-emitting diode display. The control signal CS outputted through the switch 1 0 0 is out of the test pulse and (after the logical operation of Α_, then by counting operation =

Page 12 1263195 V. Description of invention (9) One digit count signal. The digital counting signal can be used for signal conversion by the signal conversion unit 108. In the first embodiment, the digital counting signal is converted by the digital/analog converting unit 1 0 8 0 and the delay circuit 1 0 8 2 into One type of power supply is provided to provide a driver integrated circuit 20 for use as a data line drive chip. Furthermore, in the second embodiment, the digital counting signal is transmitted through the multiplexer 1 0 8 6 to select scan signal outputs of different duty cycles to provide the driving integrated circuit 20 for scanning. Line driven wafers. However, the drawings and descriptions disclosed above are only examples of the present invention, and those skilled in the art can make various other modifications according to the above description, and these changes still belong to the inventive spirit of the present invention. The scope of the patents defined below.

Page 13 1263195 Brief description of the diagram: The first figure is the internal circuit diagram of the conventional organic light-emitting diode display; the second figure is the waveform diagram of the organic light-emitting diode using the constant voltage and the constant current to adjust the brightness; The third figure is a schematic diagram of the waveform of the organic light-emitting diode using the scanning signal to adjust the brightness. The fourth figure is a block diagram of the circuit architecture of the present invention; the fifth figure is a schematic block diagram of the circuit of the present invention; FIG. 7 is a block diagram showing a circuit of a signal conversion unit according to a second embodiment of the present invention; FIG. 8 is a schematic diagram showing a waveform of a clock signal of the present invention; A schematic diagram of the waveform of the step voltage and the delay time; and a tenth diagram is a schematic diagram of the waveform of the scan signal according to the second embodiment of the present invention. Description of the figure: Convention 30 display 30 S S2, S3, S4' S5 scan line D Bu D2, D3, D4, D5 data line 3 0 2 pixel array 3 0 6 data line drive chip

Page 14 1263195 Brief Description of the Drawings 3 0 4 Scanning Line Driving Chip P1 Organic Light Emitting Diode The present invention 10 0 brightness adjusting circuit 20 driving integrated circuit 3 0 organic light emitting diode display 10 0 switch 1 0 2 Pulse generating unit 1 0 4 clock capturing unit 1 0 6 clock counting unit 1 0 8 signal converting unit 1 0 8 0 digit/analog converting unit 1 0 8 2 delay circuit 1 0 8 4 pulse width generating unit 1 0 8 6 multiplexer CS^ signal RS reference clock GS# capture clock signal CO, Cl, C2··· Cm scan signal

Page 15

Claims (1)

1263195 VI. Patent Application Range 1. A brightness adjustment circuit for an organic light emitting diode display, which provides a power supply to a driver integrated circuit for supplying an organic light emitting diode display, including: a switch And outputting a control signal; a clock generation unit outputs a reference clock; a clock acquisition unit connected to the switch and the clock generation unit, receiving the control signal and the reference clock for outputting a clock signal unit, connected to the switch and the clock acquisition unit, for receiving the control signal and the captured clock signal for outputting a digit count signal; and a digit/analog The conversion unit is connected to the clock counting unit to receive the digital counting signal and convert the digital counting signal into the supplied power. 2. The brightness adjustment circuit of the organic light emitting diode display according to claim 1, wherein the clock extraction unit is a gate circuit for AND operation. 3. The brightness adjustment circuit of the organic light emitting diode display according to claim 1, wherein the digital/analog conversion unit converts the digital count signal into the power supply according to a reference power source. 4. The brightness adjustment circuit of the organic light emitting diode display according to claim 1, wherein a delay circuit is connected to the digital/analog conversion unit to receive the supply power for a delay time. Output Page 16 1263195 VI. Scope of Application for Patent A delay in the supply of electricity. 5. The brightness adjustment circuit of an organic light emitting diode display according to claim 4, wherein the delay circuit is an RC circuit for charging/discharging. 6. A brightness adjustment circuit for an organic light emitting diode display, which provides a scan signal to a driver integrated circuit for supplying an organic light emitting diode display, including: a switch, an output control a clock generation unit that outputs a reference clock; a clock capture unit coupled to the switch and the clock generation unit for receiving the control signal and the reference clock for outputting a capture clock a pulse counting unit connected to the switch and the clock capture unit for receiving the control signal and the captured clock signal for outputting a digital count signal; a pulse width generating unit for outputting at least a scan signal; and a multiplexer connected to the clock counting unit and the pulse width generating unit to receive the digital counting signal and the scanning signals, and to select and output the digital counting signals according to the digital counting signals The brightness adjustment circuit of the organic light emitting diode display according to claim 6, wherein the clock acquisition unit is And a gate circuit for farming and (AND) of the logic operation. 8. The organic light emitting diode display according to claim 6 of the patent application scope Page 17 1263195 VI. The patent application scope is a 2-to-one multiplexer brightness adjustment circuit, wherein the multi-color 9 is the brightness adjustment circuit of the organic light-emitting diode display as described in claim 6 The digital counting signal is an n-bit digital signal, and the pulse width generating unit outputs a 2-inch scanning signal. 1 0. A brightness adjustment circuit for an organic light emitting diode display, which outputs a calibration signal to a driving integrated circuit, and through the driving integrated circuit, adjusts an organic light emitting diode display Brightness, 'including a switch for outputting a control signal; a clock generation unit for outputting a reference clock; a clock capture unit coupled to the switch and the clock generation unit for receiving the control signal and the reference a clock for outputting a digital clock signal; a clock counting unit connected to the switch and the clock capturing unit for receiving the control signal and the captured clock signal for outputting a digital counter signal And a signal conversion unit connected to the clock counting unit to receive the digital counting signal for converting and outputting the calibration signal. 11. The illuminating circuit for the organic light emitting diode-body display according to claim 10, wherein the clock capturing unit is an AND circuit for AND logic Operation. 12. The organic light emitting diode display according to claim 1, wherein the brightness conversion circuit of the patent application scope is a digital/analog conversion unit. The brightness adjustment circuit of the organic light emitting diode display according to claim 12, wherein the calibration signal output by the digital/analog conversion unit is a supply of power. 1 . The brightness adjustment circuit of the organic light emitting diode display according to claim 13 , wherein a delay circuit is connected to the digital/analog conversion unit to receive the power supply and delay The time output is delayed by the supply of power. The brightness adjustment circuit of the organic light emitting diode display according to claim 10, wherein the signal conversion unit is composed of a multiplexer connected to a pulse width generating unit, the pulse The wave width generating unit outputs at least one tuning signal, and the multiplexer is connected to the clock counting unit, and receives the digital counting signal and the tuning signals, and selects a signal according to the digit to select Output the tuning signals. The brightness adjustment circuit of the organic light emitting diode display of claim 15, wherein the adjustment signals are at least one scan signal. 1 . The brightness adjustment circuit of the organic light emitting diode display according to claim 15 , wherein the multiplexer is a 2-to-one multiplexer. Page 19