TWI807724B - Trimming circuit, LED display driver chip, and LED display device - Google Patents

Trimming circuit, LED display driver chip, and LED display device Download PDF

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TWI807724B
TWI807724B TW111111461A TW111111461A TWI807724B TW I807724 B TWI807724 B TW I807724B TW 111111461 A TW111111461 A TW 111111461A TW 111111461 A TW111111461 A TW 111111461A TW I807724 B TWI807724 B TW I807724B
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terminal
trimming
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led display
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TW202338769A (en
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王景帥
黃志正
張漢儒
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大陸商北京集創北方科技股份有限公司
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Abstract

本發明主要揭示一種修調電路，其應用於一LED顯示驅動晶片之中，其包括：一邏輯閘、一外設端、耦接該外設端的一修調單元、以及一開關元件。當一LED顯示驅動晶片進行出廠前的最終測試時，若有必要對該LED顯示驅動晶片進行修調處理，則發送一控制信號至該開關元件、該邏輯閘與該修調單元，使得該開關元件斷開該修調單元與該LED顯示驅動晶片的基準電流產生電路之間的通路；此時，一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將一輸入修調碼傳送至該修調單元，完成修調處理。The invention mainly discloses a trimming circuit, which is applied in an LED display driving chip, and includes: a logic gate, an external terminal, a trimming unit coupled to the external terminal, and a switch element. When an LED display driver chip undergoes a final test before leaving the factory, if it is necessary to perform trimming processing on the LED display driver chip, a control signal is sent to the switch element, the logic gate and the trimming unit, so that the switch element disconnects the path between the trimming unit and the reference current generating circuit of the LED display driver chip; at this time, a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits an input trimming code to the trimming unit according to the control of the control signal to complete the trimming process.

Description

修調電路、LED顯示驅動晶片、及LED顯示裝置Trimming circuit, LED display driver chip, and LED display device

本發明為與LED顯示技術有關之領域，尤指應用於LED顯示驅動晶片之中的一種修調電路。The invention relates to the field of LED display technology, especially a trimming circuit applied to LED display driving chips.

發光二極體(Light-emitting diode , LED)具有體積小、重量輕、使用壽命長、發光效率高等多項優點，目前已廣泛地應用於照明裝置及顯示裝置之中。LED顯示裝置為一種自發光平面顯示裝置，具有色彩鮮艷、動態範圍廣、亮度高、壽命長、可靠度高等優點，是以大尺寸螢幕的LED顯示裝置已廣泛地應用於大型廣場、商業廣告、體育場館、信息傳播、新聞發布、證券交易場所，作為一種公眾顯示媒介。Light-emitting diodes (Light-emitting diodes, LEDs) have many advantages such as small size, light weight, long service life, and high luminous efficiency, and have been widely used in lighting devices and display devices. The LED display device is a self-illuminating flat display device, which has the advantages of bright colors, wide dynamic range, high brightness, long life, and high reliability. The LED display device with a large screen has been widely used in large squares, commercial advertisements, stadiums, information dissemination, news releases, and stock trading places as a public display medium.

圖1顯示習知的一種LED顯示裝置的架構圖。如圖1所示，習知的LED顯示裝置1a包括：一LED顯示面板11a、一顯示控制單元14a以及複數個LED顯示驅動晶片13a。熟悉LED顯示器之設計與製造的電子工程師必然知道，顯示控制單元14a依據不同影像顯示需求而控制各所述LED顯示驅動晶片13a以同時點亮LED顯示面板11a的整個顯示區域，或僅點亮LED顯示面板11的至少一塊顯示區域。FIG. 1 shows a structure diagram of a conventional LED display device. As shown in FIG. 1 , a conventional LED display device 1a includes: an LED display panel 11a, a display control unit 14a and a plurality of LED display driver chips 13a. Electronic engineers who are familiar with the design and manufacture of LED displays must know that the display control unit 14a controls each of the LED display driver chips 13a to simultaneously light up the entire display area of the LED display panel 11a or only light up at least one display area of the LED display panel 11 according to different image display requirements.

更詳細地說明，該LED顯示驅動晶片13a通常為一恆流驅動晶片，因此包含一恆流產生電路。圖2顯示包含於圖1所示的LED顯示驅動晶片13a之中的一恆流產生電路131a的方塊圖。如圖2所示，習知的恆流產生電路131a包括一基準電流產生單元1311a、一電流鏡像單元1312a以及一電流輸出單元1313a。如圖2所示，該基準電流產生單元1311a耦接一外設電阻R1a，且其用以生成一基準電流I0。另一方面，該電流鏡像單元1312a用以將所述基準電流I0作一電流鏡像處理，從而生成一第一電流I1。最終，該電流輸出單元1313a依據該第一電流I1而產生一輸出電流IOUT傳送至一輸出通道(或稱驅動通道)，從而驅動指定的LED子畫素發光。To explain in more detail, the LED display driver chip 13a is usually a constant current driver chip, and thus includes a constant current generating circuit. FIG. 2 shows a block diagram of a constant current generating circuit 131 a included in the LED display driver chip 13 a shown in FIG. 1 . As shown in FIG. 2 , the conventional constant current generating circuit 131a includes a reference current generating unit 1311a, a current mirroring unit 1312a and a current output unit 1313a. As shown in FIG. 2, the reference current generating unit 1311a is coupled to an external resistor R1a, and is used to generate a reference current I0. On the other hand, the current mirroring unit 1312a is used for performing a current mirroring process on the reference current I0 to generate a first current I1. Finally, the current output unit 1313a generates an output current IOUT according to the first current I1 and transmits it to an output channel (or called a driving channel), so as to drive a designated LED sub-pixel to emit light.

值得說明的是，隨著顯示效果要求的提高，該LED顯示面板11a之LED子畫素的尺寸於是不斷地縮小，使得輸出電流IOUT的精度要求也不斷提高。然而，LED顯示驅動晶片13a的半導體晶片製造和封裝的製程偏差會造成構成所述LED顯示驅動晶片13a之半導體元件的參數偏移，導致相鄰的LED顯示驅動晶片13a可能具有不同的輸出電流。因此，工程師通常會在LED顯示驅動晶片13a內部加入修調電路，以提升輸出電流精度。It is worth noting that, with the improvement of display effect requirements, the size of the LED sub-pixels of the LED display panel 11a is continuously reduced, so that the accuracy requirements of the output current IOUT are also continuously improved. However, the process deviation of the semiconductor chip manufacturing and packaging of the LED display driver chip 13a will cause the parameter deviation of the semiconductor elements constituting the LED display driver chip 13a, resulting in that adjacent LED display driver chips 13a may have different output currents. Therefore, engineers usually add a trimming circuit inside the LED display driver chip 13a to improve the output current accuracy.

圖3為圖2所示之基準電流產生單元1311a的示範性拓樸圖。如圖3與圖2所示，習知的包含於所述LED顯示驅動晶片13a之中的基準電流產生單元1311a包括：一運算放大器1314a、一第一MOSFET元件1315a、一外設電阻R1a、一數位類比轉換器1316a、以及一修調電路1317a。進一步地，圖4為圖3所示之修調電路1317a的示範性拓樸圖。如圖4與圖3所示，習知的包含於所述基準電流產生單元1311a之中的修調電路1317a包括：一第二MOSFET元件1318a、一熔絲電阻R2a、以及一讀出單元1319a。FIG. 3 is an exemplary topology diagram of the reference current generating unit 1311a shown in FIG. 2 . As shown in FIG. 3 and FIG. 2 , the conventional reference current generation unit 1311a included in the LED display driver chip 13a includes: an operational amplifier 1314a, a first MOSFET element 1315a, an external resistor R1a, a digital-to-analog converter 1316a, and a trimming circuit 1317a. Further, FIG. 4 is an exemplary topological diagram of the trimming circuit 1317a shown in FIG. 3 . As shown in FIG. 4 and FIG. 3 , the conventional trimming circuit 1317a included in the reference current generating unit 1311a includes: a second MOSFET element 1318a, a fuse resistor R2a, and a readout unit 1319a.

更詳細地說明，修調是利用修調碼以及熔絲電壓VFUSE使大電流流經第二MOSFET元件1318a進入熔絲電阻R2a，熔絲電阻R2a升溫發熱進而熔斷。在熔絲電阻R2a熔斷前，讀出單元1319a輸出邏輯0；相反地，在熔絲電阻R2a熔斷後，讀出單元1319a輸出邏輯1。經過修調後，熔絲電阻R2a的電阻狀態不會再發生變化，從而保證修調碼不會因為掉電發生變化，即為一種非揮發性記憶元件(Non-Volatile Memory, NVM)。In more detail, the trimming is to use the trimming code and the fuse voltage VFUSE to cause a large current to flow through the second MOSFET element 1318a and enter the fuse resistor R2a, and the fuse resistor R2a will heat up and be blown. Before the fuse resistor R2a is blown, the readout unit 1319a outputs a logic 0; on the contrary, after the fuse resistor R2a is blown, the readout unit 1319a outputs a logic 1. After trimming, the resistance state of the fuse resistor R2a will not change again, so as to ensure that the trimming code will not change due to power failure, which is a non-volatile memory element (Non-Volatile Memory, NVM).

實務經驗顯示，習知的包含於所述基準電流產生單元1311a之中的修調電路1317a具有以下主要的應用缺陷： (1)在LED顯示驅動晶片13a處於工作狀態或是在其它非修調時間下，若輸入修調碼被誤傳送至該修調電路1317a，有可能引起輸出電流IOUT出現變化，影響LED子畫素的發光亮度；以及 (2) 另外，修調電路1317a熔斷熔絲電阻R2a需要晶片外部提供大電流，但是在通用的LED顯示驅動晶片13a之中並沒有單獨引腳耦接外部電路以提供大電流至修調電路1317a 。 Practical experience shows that the conventional trimming circuit 1317a included in the reference current generating unit 1311a has the following main application defects: (1) When the LED display driver chip 13a is in the working state or in other non-adjusting time, if the input trimming code is sent to the trimming circuit 1317a by mistake, it may cause the output current IOUT to change and affect the luminous brightness of the LED sub-pixel; and (2) In addition, the trimming circuit 1317a needs to provide a large current outside the chip to blow the fuse resistor R2a, but there is no single pin coupled with an external circuit in the general-purpose LED display driver chip 13a to provide a large current to the trimming circuit 1317a.

由上述說明可知，本領域亟需一種新式的修調電路。From the above description, it can be known that a novel trimming circuit is urgently needed in the field.

本發明之主要目的在於提供一種修調電路，其用以應用於一LED顯示驅動晶片之中，且包括：一邏輯閘、一外設端、耦接該外設端的一修調單元、以及一開關元件。若有必要對該LED顯示驅動晶片進行修調處理，則發送一控制信號至該開關元件、該邏輯閘與該修調單元，使得該開關元件斷開該修調單元與該LED顯示驅動晶片的基準電流產生電路之間的通路；此時，一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將一輸入修調碼傳送至該修調單元，完成修調處理。The main purpose of the present invention is to provide a trimming circuit, which is used in an LED display driver chip, and includes: a logic gate, a peripheral terminal, a trimming unit coupled to the peripheral terminal, and a switch element. If it is necessary to perform trimming processing on the LED display driver chip, a control signal is sent to the switch element, the logic gate and the trimming unit, so that the switch element disconnects the path between the trimming unit and the reference current generating circuit of the LED display driver chip; at this time, a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits an input trimming code to the trimming unit according to the control of the control signal, and the trimming process is completed.

為達成上述目的，本發明提出所述修調電路的一實施例，其應用於一LED顯示驅動晶片之中，且包括： 一邏輯閘，具有二輸入端分別耦接一控制信號與一輸入修調碼； 一外設端； 一修調單元，具有一第一輸入端、一第二輸入端、與一輸出端，其中該外設端耦接該第一輸入端以及該LED顯示驅動晶片所含有的一基準電流產生單元，該第二輸入端耦接該邏輯閘的輸出端，且該輸出端耦接該基準電流產生單元；以及 一開關元件，具有耦接一工作電壓的一第一端、耦接該基準電流產生單元的一第二端、以及耦接所述控制信號的一控制端； 其中，在修調期間，該開關元件依據所述控制信號的控制而斷開，使得一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將所述輸入修調碼傳送至該修調單元。 In order to achieve the above object, the present invention proposes an embodiment of the trimming circuit, which is applied to an LED display driver chip, and includes: A logic gate has two input terminals respectively coupled to a control signal and an input trimming code; a peripheral terminal; A trimming unit has a first input terminal, a second input terminal, and an output terminal, wherein the peripheral terminal is coupled to the first input terminal and a reference current generating unit contained in the LED display driver chip, the second input terminal is coupled to the output terminal of the logic gate, and the output terminal is coupled to the reference current generating unit; and A switch element, having a first terminal coupled to an operating voltage, a second terminal coupled to the reference current generating unit, and a control terminal coupled to the control signal; Wherein, during trimming, the switch element is turned off according to the control of the control signal, so that a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits the input trimming code to the trimming unit according to the control of the control signal.

在一實施例中，一外設電阻耦接該外設端。In one embodiment, a peripheral resistor is coupled to the peripheral terminal.

在一實施例中，該邏輯閘為或閘(OR gate)或及閘(AND gate)。In one embodiment, the logic gate is an OR gate or an AND gate.

在一實施例中，該開關元件為選自於由P型MOSFET開關、N型MOSFET開關和CMOS開關所組成群組之中的任一者。In one embodiment, the switching element is any one selected from the group consisting of a P-type MOSFET switch, an N-type MOSFET switch and a CMOS switch.

在一實施例中，該修調單元包括： 一運算放大器，具有一正輸入端、一負輸入端以及一輸出端； 一第一MOSFET元件，具有耦接該基準電流產生單元的一源極端、一汲極端以及耦接該運算放大器的該輸出端的一閘極端；以及 一第二MOSFET元件，具有耦接該第一MOSFET元件的該汲極端的一源極端、耦接所述控制信號的一閘極端、以及耦接至該外設端與該外設電阻之間的一共接端的一汲極端，且該汲極端還耦接該運算放大器的該正輸入端。 In one embodiment, the trimming unit includes: An operational amplifier having a positive input terminal, a negative input terminal and an output terminal; a first MOSFET element having a source terminal coupled to the reference current generating unit, a drain terminal and a gate terminal coupled to the output terminal of the operational amplifier; and A second MOSFET element has a source terminal coupled to the drain terminal of the first MOSFET element, a gate terminal coupled to the control signal, and a drain terminal coupled to a common terminal between the peripheral terminal and the peripheral resistor, and the drain terminal is also coupled to the positive input terminal of the operational amplifier.

在一實施例中，該運算放大器的該負輸入端耦接至一數位類比轉換器，該數位類比轉換器 依據所述輸入修調碼和一第一參考電壓而產生一第二參考電壓傳送至該運算放大器的該負輸入端。In one embodiment, the negative input terminal of the operational amplifier is coupled to a digital-to-analog converter, and the digital-to-analog converter generates a second reference voltage according to the input trimming code and a first reference voltage and sends it to the negative input terminal of the operational amplifier.

並且，本發明同時提出一種LED顯示驅動晶片，具有至少一恆流產生電路，且所述恆流產生電路包括一基準電流產生單元、一電流鏡像單元以及一電流輸出單元；其特徵在於，所述基準電流產生電路具有至少一修調電路，且該修調電路包括： 一邏輯閘，具有二輸入端分別耦接一控制信號與一輸入修調碼； 一外設端； 一修調單元，具有一第一輸入端、一第二輸入端、與一輸出端，其中該外設端耦接該第一輸入端以及該LED顯示驅動晶片所含有的一基準電流產生單元，該第二輸入端耦接該邏輯閘的輸出端，且該輸出端耦接該基準電流產生單元；以及 一開關元件，具有耦接一工作電壓的一第一端、耦接該基準電流產生單元的一第二端、以及耦接所述控制信號的一控制端； 其中，在修調期間，該開關元件依據所述控制信號的控制而斷開，使得一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將所述輸入修調碼傳送至該修調單元。 Moreover, the present invention also proposes an LED display driver chip, which has at least one constant current generating circuit, and the constant current generating circuit includes a reference current generating unit, a current mirroring unit, and a current output unit; it is characterized in that the reference current generating circuit has at least one trimming circuit, and the trimming circuit includes: A logic gate has two input terminals respectively coupled to a control signal and an input trimming code; a peripheral terminal; A trimming unit has a first input terminal, a second input terminal, and an output terminal, wherein the peripheral terminal is coupled to the first input terminal and a reference current generating unit contained in the LED display driver chip, the second input terminal is coupled to the output terminal of the logic gate, and the output terminal is coupled to the reference current generating unit; and A switch element, having a first terminal coupled to an operating voltage, a second terminal coupled to the reference current generating unit, and a control terminal coupled to the control signal; Wherein, during trimming, the switch element is turned off according to the control of the control signal, so that a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits the input trimming code to the trimming unit according to the control of the control signal.

在一實施例中，一外設電阻耦接該外設端。In one embodiment, a peripheral resistor is coupled to the peripheral terminal.

在一實施例中，該邏輯閘為或閘(OR gate)或及閘(AND gate)。In one embodiment, the logic gate is an OR gate or an AND gate.

在一實施例中，該修調單元包括： 一運算放大器，具有一正輸入端、一負輸入端以及一輸出端； 一第一MOSFET元件，具有耦接該基準電流產生單元的一源極端、一汲極端以及耦接該運算放大器的該輸出端的一閘極端；以及 一第二MOSFET元件，具有耦接該第一MOSFET元件的該汲極端的一源極端、耦接所述控制信號的一閘極端、以及耦接至該外設端與該外設電阻之間的一共接端的一汲極端，且該汲極端還耦接該運算放大器的該正輸入端。 In one embodiment, the trimming unit includes: An operational amplifier having a positive input terminal, a negative input terminal and an output terminal; a first MOSFET element having a source terminal coupled to the reference current generating unit, a drain terminal and a gate terminal coupled to the output terminal of the operational amplifier; and A second MOSFET element has a source terminal coupled to the drain terminal of the first MOSFET element, a gate terminal coupled to the control signal, and a drain terminal coupled to a common terminal between the peripheral terminal and the peripheral resistor, and the drain terminal is also coupled to the positive input terminal of the operational amplifier.

在一實施例中，該運算放大器的該負輸入端耦接至一數位類比轉換器，該數位類比轉換器 依據所述輸入修調碼和一第一參考電壓而產生一第二參考電壓傳送至該運算放大器的該負輸入端。In one embodiment, the negative input terminal of the operational amplifier is coupled to a digital-to-analog converter, and the digital-to-analog converter generates a second reference voltage according to the input trimming code and a first reference voltage and sends it to the negative input terminal of the operational amplifier.

進一步地，本發明還提出一種LED顯示裝置，其包括：一LED顯示面板、一顯示控制單元以及至少一個如前所述本發明之LED顯示驅動晶片。Furthermore, the present invention also proposes an LED display device, which includes: an LED display panel, a display control unit, and at least one LED display driver chip of the present invention as described above.

在可行的實施例中，該LED顯示面板包括X×Y個LED元件，X和Y皆為正整數，且所述LED元件為選自於由常規LED元件、量子點LED元件、鈣鈦礦LED元件、Mirco-LED元件和Mini-LED元件組成的群組之中的任一者。In a feasible embodiment, the LED display panel includes X×Y LED elements, where X and Y are both positive integers, and the LED elements are any one selected from the group consisting of conventional LED elements, quantum dot LED elements, perovskite LED elements, Mirco-LED elements and Mini-LED elements.

為使 貴審查委員能進一步瞭解本發明之結構、特徵、目的、與其優點，茲附以圖式及較佳具體實施例之詳細說明如後。 In order to enable your examiners to further understand the structure, features, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

圖5顯示本發明之一種LED顯示裝置的架構圖。如圖5所示，本發明之LED顯示裝置1包括：一LED顯示面板11、一顯示控制單元14以及複數個LED顯示驅動晶片13。特別地，本發明在所述顯示驅動晶片13增設至少一個修調電路，所述修調電路用以依據一修調碼而修調包含於該LED顯示驅動晶片13之中的基準電流產生單元所產生的基準電流I0，從而實現對於該LED顯示驅動晶片13之一驅動通道的輸出電流之修調。更詳細地說明，該LED顯示驅動晶片13通常為一恆流驅動晶片，因此包含至少一恆流產生電路。圖6為包含於圖5所示的LED顯示驅動晶片13之中的一恆流產生電路131的方塊圖。如圖6所示，所述恆流產生電路131包括一基準電流產生單元1311、一電流鏡像單元1312、一電流輸出單元1313以及本發明之一種修調電路。 FIG. 5 shows a structure diagram of an LED display device of the present invention. As shown in FIG. 5 , the LED display device 1 of the present invention includes: an LED display panel 11 , a display control unit 14 and a plurality of LED display driver chips 13 . In particular, the present invention adds at least one trimming circuit to the display driver chip 13, and the trimming circuit is used to trim the reference current I0 generated by the reference current generating unit included in the LED display driver chip 13 according to a trimming code, so as to realize the trimming of the output current of a driving channel of the LED display driver chip 13. In more detail, the LED display driver chip 13 is usually a constant current driver chip, and thus includes at least one constant current generating circuit. FIG. 6 is a block diagram of a constant current generating circuit 131 included in the LED display driver chip 13 shown in FIG. 5 . As shown in FIG. 6 , the constant current generating circuit 131 includes a reference current generating unit 1311 , a current mirroring unit 1312 , a current output unit 1313 and a trimming circuit of the present invention.

如圖6所示，本發明之修調電路包括：一邏輯閘1318、一外設端REXT、一修調單元1317、以及一開關元件1319，其中，該邏輯閘1318為一或閘(OR gate)或為一及閘(AND gate)，具有二輸入端與一輸出端，該二輸入端分別耦接一控制信號與一輸入修調碼。另一方面，該修調單元1317具有一第一輸入端(Fuse端)、一第二輸入端(修調碼輸入端)、與一輸出端，其中該外設端REXT耦接該修調單元1317的第一輸入端以及該LED顯示驅動晶片13的基準電流產生單元1311，該第二輸入端耦接該邏輯閘1318的輸出端，且該輸出端耦接該基準電流產生單元1311。另一方面，該開關元件1319，具有耦接一工作電壓VDD的一第一端、耦接該基準電流產生單元1311的一第二端、以及耦接所述控制信號的一控制端。在可行的實施例中，該開關元件1319可以是P型MOSFET開關、N型MOSFET開關或CMOS開關。 As shown in FIG. 6, the trimming circuit of the present invention includes: a logic gate 1318, a peripheral terminal REXT, a trimming unit 1317, and a switch element 1319, wherein the logic gate 1318 is an OR gate or an AND gate, has two input terminals and an output terminal, and the two input terminals are respectively coupled to a control signal and an input trimming code. On the other hand, the trimming unit 1317 has a first input terminal (fuse terminal), a second input terminal (trimming code input terminal), and an output terminal, wherein the peripheral terminal REXT is coupled to the first input terminal of the trimming unit 1317 and the reference current generating unit 1311 of the LED display driver chip 13, the second input terminal is coupled to the output terminal of the logic gate 1318, and the output terminal is coupled to the reference current generating unit 1311. On the other hand, the switching element 1319 has a first terminal coupled to a working voltage VDD, a second terminal coupled to the reference current generating unit 1311 , and a control terminal coupled to the control signal. In a feasible embodiment, the switching element 1319 may be a P-type MOSFET switch, an N-type MOSFET switch or a CMOS switch.

圖7為圖6所示之修調單元1317的電路拓樸圖。依據圖6與圖7可知，本發明之修調電路與該基準電流產生單元1311共用所述外設端REXT，且一外設電阻R1耦接該外設端REXT。更詳細地說明，所述修調單元1317包括：具有一正輸入端、一負輸入端以及一輸出端的一運算放大器1314、一第一MOSFET元件1315、以及一第二MOSFET元件1310。其中，該第一MOSFET元件1315具有耦接該基準電流產生單元1311的一源極端、一汲極端以及耦接該運算放大器1314的該輸出端的一閘極端。另一方面，該第二MOSFET元件1310具有耦接該第一MOSFET元件1315的該汲極端的一源極端、耦接一閘極控制信號的一閘極端、以及耦接至該外設端REXT與該外設電阻R1之間的一共接端的一汲極端，且該汲極端還耦接該運算放大器1314的該正輸入端。並且，如圖7所示，該數位類比轉換器1316具有耦接一第一參考電壓的一第一輸入端、一第二輸入端與耦接該運算放大器1314的該負輸入端的一輸出端。FIG. 7 is a circuit topology diagram of the trimming unit 1317 shown in FIG. 6 . According to FIG. 6 and FIG. 7 , the trimming circuit of the present invention shares the peripheral terminal REXT with the reference current generating unit 1311 , and an external resistor R1 is coupled to the peripheral terminal REXT. In more detail, the trimming unit 1317 includes: an operational amplifier 1314 having a positive input terminal, a negative input terminal and an output terminal, a first MOSFET element 1315 , and a second MOSFET element 1310 . Wherein, the first MOSFET element 1315 has a source terminal coupled to the reference current generating unit 1311 , a drain terminal coupled to the output terminal of the operational amplifier 1314 , and a gate terminal coupled to the output terminal of the operational amplifier 1314 . On the other hand, the second MOSFET element 1310 has a source terminal coupled to the drain terminal of the first MOSFET element 1315 , a gate terminal coupled to a gate control signal, and a drain terminal coupled to a common terminal between the peripheral terminal REXT and the external resistor R1 , and the drain terminal is also coupled to the positive input terminal of the operational amplifier 1314 . Moreover, as shown in FIG. 7 , the DAC 1316 has a first input terminal coupled to a first reference voltage, a second input terminal and an output terminal coupled to the negative input terminal of the operational amplifier 1314 .

依此設計，當所述LED顯示驅動晶片13進行出廠前的最終測試(Final test, FT)時，若有必要對該LED顯示驅動晶片13進行修調處理，則發送一控制信號至該開關元件1319，使該開關元件1319關閉(open)，從而斷開工作電壓VDD通過該基準電流產生單元1311至該修調單元1317的該第一輸入端(Fuse端)的電流通路。同時，該邏輯閘1318依據該控制信號的控制而將所述輸入修調碼傳送至該修調單元1317，且一熔絲信號通過該外設端REXT輸入該修調單元1317而在該第二MOSFET元件1310的汲極形成一汲極電流以流入該外設電阻R1，藉此方式完成修調處理，實現對於該基準電流產生單元1311所產生的基準電流I0之調整。According to this design, when the LED display driver chip 13 undergoes the final test (Final test, FT) before leaving the factory, if it is necessary to perform trimming processing on the LED display driver chip 13, a control signal is sent to the switch element 1319 to make the switch element 1319 closed (open), thereby disconnecting the current path from the operating voltage VDD to the first input terminal (Fuse terminal) of the trimming unit 1317 through the reference current generating unit 1311. At the same time, the logic gate 1318 transmits the input trimming code to the trimming unit 1317 according to the control of the control signal, and a fuse signal is input into the trimming unit 1317 through the peripheral terminal REXT to form a drain current in the drain of the second MOSFET element 1310 to flow into the peripheral resistor R1, thereby completing the trimming process and realizing the adjustment of the reference current I0 generated by the reference current generating unit 1311.

在非修調期間(或稱晶片正常工作期間)，所述控制信號控制該開關元件1319導通(close)，使工作電壓通過該開關元件1319傳送至該基準電流產生單元1311，以使該基準電流產生單元1311正常工作。同時，該邏輯閘1318依據該控制信號的控制而停止傳送所述輸入修調碼至該修調單元1317，使其不能發生修調動作。During the non-trimming period (or the normal working period of the chip), the control signal controls the switching element 1319 to be turned on (close), so that the working voltage is transmitted to the reference current generating unit 1311 through the switching element 1319, so that the reference current generating unit 1311 works normally. At the same time, the logic gate 1318 stops transmitting the input trimming code to the trimming unit 1317 according to the control of the control signal, so that no trimming action can occur.

更詳細地說明，如圖7所示，該運算放大器1314的負輸入端和正輸入端分別耦接一數位類比轉換器1316與該第二MOSFET元件1310的汲極端和該外設電阻R1之間的一共接點。換句話說，在傳送一熔絲信號(例如：Fuse電流)至該外設端REXT之後，該第二MOSFET元件1310產生一汲極電流，從而在該外設電阻R1與接地端之間形成一外設參考電壓VEXT，且該外設參考電壓VEXT傳送至該運算放大器1314的正輸入端。另一方面，該數位類比轉換器1316具有一第一輸入端、一第二輸入端與耦接該運算放大器1314的正輸入端的一輸出端，其中該第一輸入端耦接一第一參考電壓，且該第二輸入端耦接所述輸入修調碼。在修調期間，使該數位類比轉換器1316依據該輸入修調碼和該第一參考電壓VREF1而產生一第二參考電壓VREF2傳送至該運算放大器1314的該負輸入端。 In more detail, as shown in FIG. 7 , the negative input terminal and the positive input terminal of the operational amplifier 1314 are respectively coupled to a common node between a digital-to-analog converter 1316 and a drain terminal of the second MOSFET element 1310 and the external resistor R1. In other words, after transmitting a fuse signal (for example: fuse current) to the peripheral terminal REXT, the second MOSFET element 1310 generates a drain current, thereby forming a peripheral reference voltage VEXT between the peripheral resistor R1 and the ground terminal, and the peripheral reference voltage VEXT is transmitted to the positive input terminal of the operational amplifier 1314 . On the other hand, the DAC 1316 has a first input terminal, a second input terminal and an output terminal coupled to the positive input terminal of the operational amplifier 1314, wherein the first input terminal is coupled to a first reference voltage, and the second input terminal is coupled to the input trimming code. During trimming, the digital-to-analog converter 1316 generates a second reference voltage VREF2 according to the input trimming code and the first reference voltage VREF1 and sends it to the negative input terminal of the operational amplifier 1314 .

補充說明的是，在LED顯示驅動晶片13包含K個恆流產生電路的情況下，其對應地包含K個所述修調單元1317。如圖7所示，K個所述修調單元1317同時耦接該數位類比轉換器1316。此時，所述輸入修調碼亦包含K個位元(bits)，且該數位類比轉換器1316依據包含K個位元的該輸入修調碼和該第一參考電壓VREF1而產生K個第二參考電壓VREF2分別傳送至各所述運算放大器1314的負輸入端。 It is supplemented that, in the case that the LED display driver chip 13 includes K constant current generating circuits, it correspondingly includes K trimming units 1317 . As shown in FIG. 7 , K trimming units 1317 are coupled to the digital-to-analog converter 1316 at the same time. At this time, the input trimming code also includes K bits, and the digital-to-analog converter 1316 generates K second reference voltages VREF2 according to the input trimming code including K bits and the first reference voltage VREF1, and sends them to the negative input terminals of the operational amplifiers 1314 respectively.

如此，上述已完整且清楚地說明本發明之一種修調電路；並且，經由上述可得知本發明具有下列優點： In this way, the above has completely and clearly described a trimming circuit of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1)本發明揭示一種修調電路，其用以應用於一LED顯示驅動晶片之中，且包括：一邏輯閘、一外設端、一修調單元、以及一開關元件。若有必要對該LED顯示驅動晶片進行修調處理，則發送一控制信號至該開關元件、該邏輯閘與該修調單元，使得該開關元件斷開該修調單元與該LED顯示驅動晶片的基準電流產生電路之間的通路；此時，一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將一輸入修調碼傳送至該修調單元，完成修調處理。 (1) The present invention discloses a trimming circuit, which is used in an LED display driver chip, and includes: a logic gate, a peripheral terminal, a trimming unit, and a switch element. If it is necessary to perform trimming processing on the LED display driver chip, a control signal is sent to the switch element, the logic gate and the trimming unit, so that the switch element disconnects the path between the trimming unit and the reference current generating circuit of the LED display driver chip; at this time, a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits an input trimming code to the trimming unit according to the control of the control signal, and the trimming process is completed.

(2)本發明同時揭示一種LED顯示裝置，其包括：一LED顯示面板、一顯示控制單元以及至少一個如前所述本發明之LED顯示驅動晶片。在可行的實施例中，該LED顯示面板包括X×Y個LED元件，X和Y皆為正整數，且所述LED元件為選自於由常規LED元件、量子點LED元件、鈣鈦礦LED元件、Mirco-LED元件和Mini-LED元件組成的群組之中的任一者。(2) The present invention also discloses an LED display device, which includes: an LED display panel, a display control unit, and at least one LED display driver chip of the present invention as described above. In a feasible embodiment, the LED display panel includes X×Y LED elements, where X and Y are both positive integers, and the LED elements are any one selected from the group consisting of conventional LED elements, quantum dot LED elements, perovskite LED elements, Mirco-LED elements and Mini-LED elements.

必須加以強調的是，前述本案所揭示者乃為較佳實施例，舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者，俱不脫本案之專利權範疇。It must be emphasized that the above-mentioned disclosure in this case is a preferred embodiment. For example, any partial changes or modifications derived from the technical ideas of this case and easily deduced by those who are familiar with the technology are within the scope of the patent right of this case.

綜上所陳，本案無論目的、手段與功效，皆顯示其迥異於習知技術，且其首先發明合於實用，確實符合發明之專利要件，懇請  貴審查委員明察，並早日賜予專利俾嘉惠社會，是為至禱。To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and indeed meets the patent requirements of the invention. I sincerely hope that your review committee will be aware of it, and grant a patent as soon as possible to benefit the society. This is my best prayer.

1a:LED顯示裝置 11a:LED顯示面板 13a:LED顯示驅動晶片 14a:顯示控制單元 131a:恆流產生電路 1311a:基準電流產生單元 1312a:電流鏡像單元 1313a:電流輸出單元 1314a:運算放大器 1315a:第一MOSFET元件 1316a:數位類比轉換器 1317a:修調電路 1318a:第二MOSFET元件 1319a:讀出單元 R1a:外設電阻 R2a:熔絲電阻 1:LED顯示裝置 11:LED顯示面板 13:LED顯示驅動晶片 14:顯示控制單元 131:恆流產生電路 1311:基準電流產生單元 1312:電流鏡像單元 1313:電流輸出單元 1314:運算放大器 1315:第一MOSFET元件 1310:第二MOSFET元件 1316:數位類比轉換器 1317:修調單元 1318:邏輯閘 1319:開關元件 R1:外設電阻 REXT:外設端 1a: LED display device 11a: LED display panel 13a: LED display driver chip 14a: Display control unit 131a: Constant current generating circuit 1311a: reference current generating unit 1312a: current mirror unit 1313a: current output unit 1314a: Operational amplifier 1315a: first MOSFET element 1316a: Digital to Analog Converter 1317a: trimming circuit 1318a: Second MOSFET element 1319a: readout unit R1a: Peripheral resistor R2a: Fuse resistor 1: LED display device 11: LED display panel 13: LED display driver chip 14: Display control unit 131: Constant current generating circuit 1311: Reference current generating unit 1312: current mirror unit 1313: Current output unit 1314: Operational Amplifier 1315: The first MOSFET component 1310: second MOSFET element 1316: Digital to Analog Converter 1317: Trimming unit 1318: logic gate 1319: switch element R1: Peripheral resistor REXT: peripheral terminal

圖1為習知的一種LED顯示裝置的架構圖； 圖2為包含於圖1所示的顯示驅動晶片之中的一恆流產生電路的方塊圖； 圖3為圖2所示之基準電流產生單元的示範性拓樸圖； 圖4為圖3所示之修調電路的示範性拓樸圖； 圖5為本發明之一種LED顯示裝置的架構圖； 圖6為包含於圖5所示的LED顯示驅動晶片之中的一恆流產生電路的方塊圖；以及 圖7為圖6所示之修調單元的電路拓樸圖。 FIG. 1 is a structural diagram of a conventional LED display device; FIG. 2 is a block diagram of a constant current generating circuit included in the display driver chip shown in FIG. 1; FIG. 3 is an exemplary topological diagram of the reference current generating unit shown in FIG. 2; FIG. 4 is an exemplary topological diagram of the trimming circuit shown in FIG. 3; 5 is a structural diagram of an LED display device of the present invention; FIG. 6 is a block diagram of a constant current generating circuit included in the LED display driver chip shown in FIG. 5; and FIG. 7 is a circuit topology diagram of the trimming unit shown in FIG. 6 .

131:恆流產生電路 131: Constant current generating circuit

1311:基準電流產生單元 1311: Reference current generating unit

1312:電流鏡像單元 1312: current mirror unit

1313:電流輸出單元 1313: Current output unit

1317:修調單元 1317: Trimming unit

1318:邏輯閘 1318: logic gate

1319:開關元件 1319: switch element

R1:外設電阻 R1: Peripheral resistor

REXT:外設端 REXT: peripheral terminal

Claims (11)

一種修調電路，應用於一LED顯示驅動晶片之中，且包括：一邏輯閘，具有二輸入端分別耦接一控制信號與一輸入修調碼；一外設端；一修調單元，具有一第一輸入端、一第二輸入端、與一輸出端，其中該外設端耦接該第一輸入端以及該LED顯示驅動晶片所含有的一基準電流產生單元，該第二輸入端耦接該邏輯閘的輸出端，且該輸出端耦接該基準電流產生單元；以及一開關元件，具有耦接一工作電壓的一第一端、耦接該基準電流產生單元的一第二端、以及耦接所述控制信號的一控制端；其中，在修調期間，該開關元件依據所述控制信號的控制而斷開，使得一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將所述輸入修調碼傳送至該修調單元。 A trimming circuit is applied to an LED display driver chip, and includes: a logic gate with two input terminals respectively coupled to a control signal and an input trimming code; a peripheral terminal; a trimming unit with a first input terminal, a second input terminal, and an output terminal, wherein the peripheral terminal is coupled to the first input terminal and a reference current generation unit contained in the LED display driver chip, the second input terminal is coupled to the output terminal of the logic gate, and the output terminal is coupled to the reference current generation unit; A first end connected to a working voltage, a second end coupled to the reference current generating unit, and a control end coupled to the control signal; wherein, during trimming, the switch element is disconnected according to the control of the control signal, so that a fuse signal is input to the trimming unit through the peripheral end, and at the same time, the logic gate transmits the input trimming code to the trimming unit according to the control of the control signal. 如請求項1所述之修調電路，其中，一外設電阻耦接該外設端。 The trimming circuit according to claim 1, wherein an external resistor is coupled to the external terminal. 如請求項1所述之修調電路，其中，該邏輯閘為或閘(OR gate)或及閘(AND gate)。 The trimming circuit according to claim 1, wherein the logic gate is an OR gate or an AND gate. 如請求項2所述之修調電路，其中，該修調單元包括：一運算放大器，具有一正輸入端、一負輸入端以及一輸出端； 一第一MOSFET元件，具有耦接該基準電流產生單元的一源極端、一汲極端以及耦接該運算放大器的該輸出端的一閘極端；以及一第二MOSFET元件，具有耦接該第一MOSFET元件的該汲極端的一源極端、耦接一閘極控制信號的一閘極端、以及耦接至該外設端與該外設電阻之間的一共接端的一汲極端，且該汲極端還耦接該運算放大器的該正輸入端。 The trimming circuit according to claim 2, wherein the trimming unit includes: an operational amplifier having a positive input terminal, a negative input terminal and an output terminal; A first MOSFET element has a source terminal coupled to the reference current generating unit, a drain terminal and a gate terminal coupled to the output terminal of the operational amplifier; and a second MOSFET element has a source terminal coupled to the drain terminal of the first MOSFET element, a gate terminal coupled to a gate control signal, and a drain terminal coupled to a common terminal between the peripheral terminal and the peripheral resistor, and the drain terminal is also coupled to the positive input terminal of the operational amplifier. 如請求項4所述之修調電路，其中，該運算放大器的該負輸入端耦接至一數位類比轉換器，該數位類比轉換器依據所述輸入修調碼和一第一參考電壓而產生一第二參考電壓傳送至該運算放大器的該負輸入端。 The trimming circuit as described in claim 4, wherein the negative input terminal of the operational amplifier is coupled to a digital-to-analog converter, and the digital-analog converter generates a second reference voltage according to the input trimming code and a first reference voltage and sends it to the negative input terminal of the operational amplifier. 一種LED顯示驅動晶片，具有至少一恆流產生電路，且所述恆流產生電路包括一基準電流產生單元、一電流鏡像單元以及一電流輸出單元；其特徵在於，所述基準電流產生單元具有至少一修調電路，且該修調電路包括：一邏輯閘，具有二輸入端分別耦接一控制信號與一輸入修調碼；一外設端；一修調單元，具有一第一輸入端、一第二輸入端與一輸出端，其中該外設端耦接該第一輸入端以及該LED顯示驅動晶片所含有的一基準電流產生單元，該第二輸入端耦接該邏輯閘的輸出端，且該輸出端耦接該基準電流產生單元；以及一開關元件，具有耦接一工作電壓的一第一端、耦接該基準電流產生單元的一第二端、以及耦接所述控制信號的一控制端； 其中，在修調期間，該開關元件依據所述控制信號的控制而斷開，使得一熔絲信號通過該外設端輸入該修調單元，同時該邏輯閘依據該控制信號的控制而將所述輸入修調碼傳送至該修調單元。 An LED display driver chip has at least one constant current generation circuit, and the constant current generation circuit includes a reference current generation unit, a current mirror unit, and a current output unit; it is characterized in that the reference current generation unit has at least one trimming circuit, and the trimming circuit includes: a logic gate, with two input terminals respectively coupled to a control signal and an input trimming code; A reference current generating unit contained in the drive chip, the second input terminal is coupled to the output terminal of the logic gate, and the output terminal is coupled to the reference current generating unit; and a switch element has a first terminal coupled to an operating voltage, a second terminal coupled to the reference current generating unit, and a control terminal coupled to the control signal; Wherein, during trimming, the switch element is turned off according to the control of the control signal, so that a fuse signal is input to the trimming unit through the peripheral terminal, and at the same time, the logic gate transmits the input trimming code to the trimming unit according to the control of the control signal. 如請求項6所述之LED顯示驅動晶片，其中，一外設電阻耦接該外設端。 In the LED display driver chip as claimed in claim 6, an external resistor is coupled to the external terminal. 如請求項6所述之LED顯示驅動晶片，其中，該邏輯閘為或閘(OR gate)或及閘(AND gate)。 The LED display driver chip according to claim 6, wherein the logic gate is an OR gate or an AND gate. 如請求項7所述之LED顯示驅動晶片，其中，該修調單元包括：一運算放大器，具有一正輸入端、一負輸入端以及一輸出端；一第一MOSFET元件，具有耦接該基準電流產生單元的一源極端、一汲極端以及耦接該運算放大器的該輸出端的一閘極端；以及一第二MOSFET元件，具有耦接該第一MOSFET元件的該汲極端的一源極端、耦接一閘極控制信號的一閘極端、以及耦接至該外設端與該外設電阻之間的一共接端的一汲極端，且該汲極端還耦接該運算放大器的該正輸入端。 The LED display driver chip as described in claim 7, wherein the trimming unit includes: an operational amplifier having a positive input terminal, a negative input terminal and an output terminal; a first MOSFET element having a source terminal coupled to the reference current generating unit, a drain terminal and a gate terminal coupled to the output terminal of the operational amplifier; and a second MOSFET element having a source terminal coupled to the drain terminal of the first MOSFET element, a gate terminal coupled to a gate control signal, and a gate terminal coupled to the output terminal of the operational amplifier. A drain terminal of a common terminal between the peripheral terminal and the peripheral resistor, and the drain terminal is also coupled to the positive input terminal of the operational amplifier. 如請求項9所述之LED顯示驅動晶片，其中，該運算放大器的該負輸入端耦接至一數位類比轉換器，該數位類比轉換器依據所述輸入修調碼和一第一參考電壓而產生一第二參考電壓傳送至該運算放大器的該負輸入端。The LED display driver chip as described in Claim 9, wherein the negative input terminal of the operational amplifier is coupled to a digital-to-analog converter, and the digital-analog converter generates a second reference voltage according to the input trimming code and a first reference voltage and sends it to the negative input terminal of the operational amplifier. 一種LED顯示裝置，包括：一LED顯示面板、一顯示控制單元以及至少一個如請求項6至10中任一項所述之LED顯示驅動晶片。An LED display device, comprising: an LED display panel, a display control unit and at least one LED display driver chip according to any one of claims 6-10.
TW111111461A 2022-03-25 2022-03-25 Trimming circuit, LED display driver chip, and LED display device TWI807724B (en)

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