液晶電視
電子發(fā)燒友網(wǎng)本頻道提供了專業(yè)的液晶電視技術(shù)文章和液晶電視及數(shù)字電視知識(shí)及應(yīng)用資料等;是值得收藏和分享的液晶電視知識(shí)欄目。
Charlieplexing - Reduced Pin-C
Abstract: This application note discusses "Charlieplexing" -- a pin-count reducing multiplex technique used by the MAX6950, MAX6951, MAX6954, MAX6955, MAX6958, and MAX6959 LED display drivers. This application note discus...
2009-05-04 標(biāo)簽：led 592
Driving 4-1/2 Digit Counter Di
Abstract: This application note provides details on how to connect the MAX6958 and MAX6959 LED display drivers to 5-digit LED displays for counter display applications requiring the display range -39999 to 39999 without decimal points. ...
2009-05-04 標(biāo)簽：led 934
使用MAX6954驅(qū)動(dòng)7段LED顯示器
摘要：本文旨在幫助工程師快速掌握MAX6954驅(qū)動(dòng)7段單色LED驅(qū)動(dòng)器的使用方法。 MAX6954是一個(gè)通用顯示驅(qū)動(dòng)器，能夠通過一個(gè)串口控制多個(gè)分立、7段、14段或16段LED顯示器...
使用MAX6954驅(qū)動(dòng)14段LED顯示器
摘要：本文旨在幫助工程師快速掌握MAX6954驅(qū)動(dòng)14段單色LED顯示器的使用方法。 MAX6954是一個(gè)通用顯示驅(qū)動(dòng)器，能夠通過一個(gè)串口控制多個(gè)分立、7段、14段或16段LED顯...
2009-05-03 標(biāo)簽：led 1002
快速掌握MAX6954驅(qū)動(dòng)16段單色LED顯示器的使用方法
本文旨在幫助工程師快速掌握MAX6954驅(qū)動(dòng)16段單色LED顯示器的使用方法。 MAX6954是一個(gè)通用顯示驅(qū)動(dòng)器，能夠通過一個(gè)串口控制多個(gè)分立、7段、14段或16段LED顯示器。本篇...
2009-05-03 標(biāo)簽：MAX6954 1428
白光LED驅(qū)動(dòng)器提供64級(jí)對(duì)數(shù)調(diào)光-White-LED Dr
Abstract: This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is designed for portable-power...
2009-05-03 標(biāo)簽：led 522
顯示器提供背光的高亮度發(fā)光二極管和SEPIC電源模塊-Dis
Abstract: In automotive applications, offering a wide dimming ratio for backlights is important because the display panel must be viewable in both direct sunlight and in complete darkness. The latest high-brightness (HB) LEDs offer a backl...
參考設(shè)計(jì)采用MAX15026為輔助電源的液晶電視或機(jī)頂盒-R
Abstract: This application note shows a reference design using the MAX15026 low-cost, high-efficiency synchronous buck converter in an auxiliary power supply for LCD TVs or set-top boxes. This reference design generates a 5V, 5A power supp...
2009-05-02 標(biāo)簽：MAX15026 1051
優(yōu)化緩沖放大器/ADC的連接
摘要：隨著接收機(jī)數(shù)字化程度的提高，模擬信號(hào)至數(shù)字域的轉(zhuǎn)換成為提高通信設(shè)備動(dòng)態(tài)性能的關(guān)鍵。本文詳細(xì)討論了為通信設(shè)備選擇適當(dāng)?shù)男盘?hào)調(diào)理及轉(zhuǎn)換器件時(shí)需要考慮的關(guān)鍵參...
2009-04-29 標(biāo)簽：adc 892
白光LED驅(qū)動(dòng)器提供64級(jí)對(duì)數(shù)調(diào)光-White-LED Dr
Abstract: This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is designed for portable-power...
2009-04-28 標(biāo)簽：led 832
LCD對(duì)比度控制的半導(dǎo)體數(shù)字電位器-LCD Contrast
Abstract: Manufacturers of portable equipment, workstations, small handheld computers, cell phones, and video games use flat panel displays to display text and images. Electro-mechanical potentiometers have been the typical mechanism used ...
使用DS1050可編程PWMs控制直流電動(dòng)機(jī)和LED背光液晶
Abstract: The DS1050 is a 5-bit pulse-width modulator (PWM) controlled by a 2-wire bus. This allows a single master device to control up to 8 slave (DS1050 and other 2-wire devices) on a single 2-wire bus. In this application note, an inte...
2009-04-28 標(biāo)簽：led電動(dòng)機(jī) 1009
總線的I/O擴(kuò)展器控制LCD偏置電壓
Abstract: A circuit consisting of an SMBus™ I/O expander, step-up converter, and digital potentiometer enables the SMBus to control the contrast of an LCD. Small, handheld, battery-powered devices often feature an L...
LCD電視背光照明中的設(shè)計(jì)挑戰(zhàn)
摘要：LCD (液晶顯示器)是電控發(fā)光管，LCD TV (液晶顯示電視)采用白光作為“背光”，通常使用冷陰極熒光燈(CCFL)為彩色熒光屏照明。其它技術(shù)，如：發(fā)光二極管(LED), 也作為一種考慮...
2009-04-28 標(biāo)簽：lcd 783
順序啟動(dòng)CCFL顯示器的突發(fā)亮度調(diào)節(jié)
摘要：為了降低對(duì)直流逆變器瞬間電流的需求，DS3984/DS3988冷陰極熒光燈控制器采用順序啟動(dòng)突發(fā)亮度調(diào)節(jié)的方式，控制LCD顯示器的每個(gè)通道。 圖1給出了DS3984/DS3988冷陰...
2009-04-28 標(biāo)簽：顯示器 836
DS3984/DS3988多燈驅(qū)動(dòng)方案
摘要：DS3984和DS3988是多通道冷陰極熒光燈(CCFL)控制器。DS3984支持多達(dá)四通道，DS3988支持八通道。這些控制器使用推挽式驅(qū)動(dòng)架構(gòu)，可將DC電源電壓轉(zhuǎn)換成為驅(qū)動(dòng)CCFL所需的高壓AC波形。...
用DS39xx CCFL控制器實(shí)現(xiàn)模擬調(diào)光
摘要：DS3881、DS3882、DS3984、DS3988、DS3991、DS3992和DS3994是冷陰極熒光燈(CCFL)背光液晶顯示器(LCD)控制器。為了取得滿意的視覺效果或延長(zhǎng)燈泡壽命，在大多數(shù)應(yīng)用中需要進(jìn)行亮度調(diào)節(jié)。...
2009-04-28 標(biāo)簽：控制器 1239
增強(qiáng)DS39x系列CCFL控制器的柵極驅(qū)動(dòng)能力
摘要：DS3984、DS3988、DS3991、DS3992以及DS3994是冷陰極熒光燈管(CCFL)的控制器，用于液晶顯示LCD的背光。每個(gè)控制器通道可以驅(qū)動(dòng)兩個(gè)邏輯電平MOSFET以轉(zhuǎn)換直流電壓到CCFL驅(qū)動(dòng)所需要的高...
低壓差線性穩(wěn)壓改善白光LED的亮度匹配-LDO Linear
Abstract: A simple, traditional method of powering white light-emitting-diodes (LEDs) with fixed bias voltage and ballast resistors result in poor brightness matching between LEDs. This is due to wide LED forward voltage variation, sometim...
2009-04-27 標(biāo)簽：led 645
Buck/Boost Charge-Pump Regulat
Abstract: The MAX1759 step-up/step-down charge-pump regulator is used to power white LEDs with constant current by clever use of a feedback network. The 1x/2x modes of the charge pump provides high efficiency, especially in two-cell NiMH a...
2009-04-27 標(biāo)簽：Powers 1627
串聯(lián)或并聯(lián)白光LED的供電方案：電荷泵與升壓型DC-DC轉(zhuǎn)換
摘要：白光LED被普遍用作便攜設(shè)備LCD的背光源，原因是他們復(fù)雜程度較低、花費(fèi)較少且尺寸小于CCFL背光源。PDA、手機(jī)和數(shù)碼相機(jī)等便攜設(shè)備已逐步過渡到彩色LCD顯示屏，因此，越來...
2009-04-27 標(biāo)簽：led 2243
結(jié)構(gòu)緊湊，無電感升壓電路調(diào)節(jié)白光LED偏置電流-Compac
Abstract: This article shows how to use the MAX1759 buck/boost charge pump to power white LEDs for display backlighting in portable applications. The increasing use of color LCDs in hand-held equipment is creating a need ...
2009-04-27 標(biāo)簽：led 1247
混合電路驅(qū)動(dòng)器的類型和數(shù)量的LED-Circuit Driv
Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illumination, red for power, etc., and in varying quantities of each. Typically the LEDs are driven by at least two power supplies, one f...
2009-04-27 標(biāo)簽：led驅(qū)動(dòng)器 810
單管控制第二LED陣列在開關(guān)模式LED背燈-Single F
White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than those based on CCFL and EL technology. As a result, the white-LED backlight is increasingly common in PDAs, cell-phones, dig...
2009-04-27 標(biāo)簽：led 876
利用LDO改善白光LED的匹配度
摘要：白光發(fā)光二極管(LED)在各種照明設(shè)備中的應(yīng)用正在穩(wěn)步增長(zhǎng)，如手持產(chǎn)品中的閃光燈、顯示器背光等。與白熾燈相比，它們提供真正的白光、消耗更低的功耗。與熒光燈相比，...
2009-04-27 標(biāo)簽：led 557
白色LED的恒流驅(qū)動(dòng)
摘要：用白色LED為顯示器或其他照明設(shè)備做背光源時(shí)，需要對(duì)其進(jìn)行恒流驅(qū)動(dòng)，主要原因是： 避免驅(qū)動(dòng)電流超出最大額定值，影響其可靠性。 獲得預(yù)期的亮度要求，并...
2009-04-27 標(biāo)簽：led 749
白光LED驅(qū)動(dòng)器提供64級(jí)對(duì)數(shù)調(diào)光-White-LED Dr
Abstract: This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is designed for portable-power...
2009-04-27 標(biāo)簽：led 863
設(shè)計(jì)非隔離型反激LED驅(qū)動(dòng)器
摘要：本應(yīng)用筆記提供了一個(gè)驅(qū)動(dòng)高亮度LED的簡(jiǎn)單電路，只需很少的外圍元件，并提供了線性和PWM亮度調(diào)節(jié)的功能。非常適合Osram、Lumiled、Cree和Nichia LED。 概述...
2009-04-27 標(biāo)簽：led驅(qū)動(dòng)器 515
高亮度LED恒流驅(qū)動(dòng)電路設(shè)計(jì)
高亮度LED恒流驅(qū)動(dòng)電路設(shè)計(jì) 摘要：本文討論的簡(jiǎn)單電路能夠調(diào)節(jié)高亮度LED的驅(qū)動(dòng)電流，該電路采用非定制、高度集成的降壓型開關(guān)調(diào)節(jié)器(MAX5035)，...
2009-04-27 標(biāo)簽：led 3306
具備高溫保護(hù)功能的白光LED驅(qū)動(dòng)器
摘要：電路驅(qū)動(dòng)一只大功率白光LED (WLED)，當(dāng)溫度過高以及熱敏電阻發(fā)生開路或短路故障時(shí)，將關(guān)閉LED。 具備高溫保護(hù)功能的白光LED驅(qū)動(dòng)器 摘要：電路驅(qū)動(dòng)一只大功率...
2009-04-27 標(biāo)簽：led 720
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