LCD optimization and modeling

Abstract— The application of the LCD modeling and optimization system, LCD DESIGN, for the design and development of new advanced LCD configurations was demonstrated. The software includes a powerful optimization module that allows for spectral and angular averaging, thus enabling the production of LCDs with wide viewing angles, achromatic (black/white) switching, and fast response time. We describe the basic principles of the software development and present several examples of LCD optimization in various electro‐optical modes. A brief review of our results of LCD optimization and modeling using LCD DESIGN software is also given.     

A new optical elasticity resin for mobile LCD modules

Abstract— The display used in current cell phones has an air gap between the cover glass and the liquid‐crystal‐display (LCD) module to prevent the LCD glass from being damaged. Reflections at the boundaries of the air gap cause a reduction in the LCD luminance and contrast. To address this problem, a newly proposed LCD structure has been investigated. The “Super View Resin (SVR),” a transparent elastic resin which improves the shock resistance and visibility of the LCD, has been developed. Filling the air gap between the cover glass and LCD module with a refractive‐index‐matching resin solves the light‐reflection problem inherent in the use of a reinforced cover‐glass lens. Moreover, the elastic filler works as a damper, reducing any external shock, which prevents not only the cover glass and LCD module from being damaged, but also the glass from being shattered when it is broken.     

LTPS circuit integration for system‐on‐glass LCDs

Abstract— A 3.5‐in. QVGA‐formatted driving‐circuit fully integrated LCD has been developed using low‐temperature poly‐Si (LTPS) technology. This display module, in which no external ICs are required, integrates all the driving circuits for a six‐bit RGB digital interface with an LTPS device called a “FASt LDD TFT” and achieves a high‐quality image, narrow frame width, and low power consumption. The LTPS process, device, and circuit technologies developed for system‐on‐glass LCD discussed. The development phase of LTPS circuit integration for system‐on‐glass LCDs is also reviewed.     

Line‐time optimization technology for ultra‐large and high‐resolution liquid crystal displays

This paper proposes a line‐time optimization (LTO) technology for ultra‐large and high‐resolution liquid crystal display (LCD) televisions. Line‐time optimization enables a single‐bank data driver configuration without severe image degradation. When the proposed method is applied to an ultra‐high‐definition (UHD) LCD with a single‐bank data driver scheme, the LCD performance comparable to that of a dual‐bank data driver method can be obtained. The implementation of the proposed method helps in achieving desirable goals such as a reduction in the number of drivers and realization of a much more flexible design of UHD LCDs.     

Technologies towards patterned optical foils applied to transflective LCDs

Abstract— For better front‐of‐screen performance for transflective LCDs, a technology with extra free optimization parameters for the optical stack is needed. Thin wet coatable retarders which enable adjustment of the optical activity on the (sub)pixel level have been developed. Isotropic domains have been created in nematic retardation films by thermal patterning or photopatterning. Employing such a patterned retarder in a transflective LCD leads to an LCD that is lighter and thinner with good reflectivity, high transmission, and low chromaticity at all gray levels and wide viewing angles. The patterned thin‐film technology has been proven to be versatile and applicable in various LCD designs.     

TFT‐LCD driver IC with embedded non‐volatile memory for portable applications

Abstract— To improve the display quality and yield of the TFT‐LCD driver IC, non‐volatile multiple‐time‐programmable (MTP) memory, which consists of an EEPROM cell and our proposed sense amplifier and power control circuit (SP), was integrated into a TFT‐LCD driver IC. The proposed SP has a 30% smaller layout area and a 18% faster response time compared to that of the conventional SP. The proposed SP also has lower power consumption because it does not use a static current. The TFT‐LCD quality was also improved by tuning the characteristics of the driver IC and the panel with the VREF, OSC, and VCOM blocks, using non‐volatile MTP memory. When the display quality improved, the yield also improved, along with a reduction in the failure ratio of the display module, which consists of the driver IC and the panel. As a result, the TFT‐LCD driver IC with the non‐volatile MTP memory demonstrated improved display quality and a higher yield compared to conventional driver ICs without such a memory.     

JLX12864G-139液晶显示器的应用设计

介绍了7XDSP芯片TMS320F2812为CPU的有源电力滤波器中液晶模块JLX12864G－139的应用设计方法,详细说明了DSP芯片与液晶模块的硬件接口电路设计,通过分析液晶模块的读写时序,阐述了在TMS320F2812中用软件模拟时序的方法,实现了对液晶模块JLX12864G－139的控制。     

An in‐cell capacitive touch sensor integrated in an LTPS WSVGA TFT‐LCD

This paper discusses an In‐cell capacitive touch sensor and its integration in an LTPS TFT‐LCD with 7‐inch screen size and WSVGA resolution. The operation of the newly developed sensor is based on capacitive coupling between user's finger and the detection electrode on the TFT substrate, and is purely capacitive. The sensors and the sensor driver circuits have been integrated in the TFT substrate of the prototype TFT‐LCD using LTPS technology. The prototype having 256x150 sensors shows advantages such as smooth operation with no touch force, high position accuracy, multi‐touch (10 or more), a thin and light LCD module, high display quality, and thus is suitable for various applications such as cell‐phones, smart‐phones, mobile‐PCs, and automotive‐use displays.     

基于W77E58单片机的图形液晶显示的设计与应用

详细论述了W77E58单片机,MG-12232图形点阵式液晶显示器的硬件接口电路特点和接口软件编程方法,设计了液晶动态显示信息的算法,利用该算法可左右、上下滚动显示信息。给出了液晶显示模块在智能车载终端应用的实例,该车载终端集成了GPS定位模块、GPRS通信模块,为车辆的调度指挥提供了强有力的技术支持和可视化依据。     

用C8051F单片机控制MGLS12032液晶显示模块

设计了内置SED1520的液晶显示模块MGLS12032与C8051F020单片机的接口电路.提供了在＋5V外部单电源供电的场合下产生液晶驱动所需负压的具体电路.针对MGLS12032左右分屏结构的特点,给出了在全屏任意位置显示汉字的实例程序.硬件电路和软件例程都运行可靠,具有参考与实用价值.     

基于MSP430的风机盘管温控器设计与实现

针对目前的中央空调系统的风机盘管部分,设计了一个基于超低功耗微控制器MSP430的温控器,其中包括液晶显示触摸模块和风机盘管控制模块两部分。操作者可以通过观察液晶上的数字,操作液晶上面的触摸按键来控制风机盘管控制模块,进而控制风机盘管实现控制空气温度的目的。在之前的温控器的基础上,首先采用超低功耗的微控制器作为主芯片设计低功耗的温控器;其次,在该设计中风机盘管控制模块是个双串口通信模块,既可以通过液晶模块控制风机盘管,也可以通过上位机远程操作控制风机盘管。     

中、小尺寸TFT-LCD系统时序控制模块的设计

说明时序控制模块和LCD系统中其它子模块之间的关系,对时序控制模块所要解决的时序问题进行分析。在分析问题的基础上提出一种适用于中、小尺寸液晶显示系统时序控制模块的实现结构。对时序控制模块进行功能验证,给出FPGA逻辑功能验证结果,证明设计可行。     

Scaling‐up PECVD system for large‐sized substrate processing

Abstract— With the prevailing trend of large‐panel TFT monitors and, most recently, LCD TVs, large‐sized‐substrate processing is becoming the mainstream of TFT‐LCD production. To enable this trend of ever‐increasing large‐area processing, a multiple generations of PECVD systems for volume production has been successfully developed. This paper discusses the scaling‐up challenges from the equipment manufacturer's perspective, with the focus on process scalability, system design optimization, productivity enhancement, and cost‐of‐ownership reduction.     

一种通用模拟器LCD显示方案设计

通过分析模拟器系统中LCD显示的需求,利用嵌入式芯片、LCD显示模块和电脑主机设计了一种通用LCD显示方案。将绘制界面的任务交由上位机程序完成,形成图像点阵信息并编码后通过UDP协议发送给ARM,完成LCD的显示。经测试,该模块响应、刷新速度较快,而且通用性强,可以广泛应用到类似系统。     

Switchable transmissive and reflective liquid‐crystal display using a multi‐domain vertical alignment

Abstract— A wide‐view transflective liquid‐crystal display (LCD) capable of switching between transmissive and reflective modes in response to different ambient‐light conditions is proposed. This transflective LCD adopts a single‐cell‐gap multi‐domain vertical‐alignment (MVA) cell that exhibits high contrast ratio, wide‐viewing angle, and good light transmittance (T) and reflectance (R). Under proper cell optimization, a good match between the VT and VR curves can also be obtained for single‐gamma‐curve driving.     

基于单片机直接驱动段式LCD的驱动模块设计

提出并设计了一种基于单片机直接驱动段式LCD的驱动模块,使用简单的附加电路实现了对背极信号的有效控制。该电路与程序相配合,实现了偏置电压控制法,交流驱动信号的产生由背极信号与段极信号的配合形成,且交流驱动信号的直流分量的平均值为零。该驱动模块具有一般性,适用于需计数、计时、状态提示等LCD显示的电子类产品中。     

Optimization of liquid crystals for television

Abstract— LCD TVs have dramatically improved in performance during the last 2 years. At the same time, the sale prices decreased by more than 50%. Together with the introduction of digital terrestrial broadcasting, this resulted in increasing sales of LCD TVs. This paper gives an overview of the main liquid‐crystal display (LCD) technologies used for TVs. We discuss key materials, synthesis, structural property relationships, and the optimization of LC mixture properties. For all technologies, we have achieved fast‐switching LC mixtures (16 msec). Novel materials for LC mixtures for the next generation of superior performance LCD TVs with 8‐msec switching times are shown.     

LCD显示模块在便携式测力计中的应用

笔段型液晶显示器是以长条状显示像素组成一位显示字符或专用固定图形和字符的液晶显示器。该文介绍由HOLTEK HT1621 LCD驱动器与液晶显示板构成的笔段型液晶显示模块在便携式测力计中的应用,其中包括硬件电路设计及控制程序设计。     

Two approaches to derive LED driving signals for high‐dynamic‐range LCD backlights

Abstract— The LED‐array backlight technique dramatically enhances the dynamic range of an LCD and hence extends its ability to present images with high reality. This is achieved by modulating LEDs individually, thus providing an area‐adaptive backlight for the display. The spatial overlap of light from the LED (crosstalk) occurs due to the diffusion screen placed between the backlight and LCD layer. However, the crosstalk is not only a blessing for supplying high brightness but is also a curse for causing potential artifacts, making the derivation of an LED driving signal a challenging task. This paper formulates the problem into two mathematical models: an iterative de‐convolution approach and a linear optimization approach. Algorithms for solving these two models are provided. The first approach provides instantaneous and satisfactory results except for high‐intensity highlights in the image. The linear optimization method conquers this drawback, but requires much more computation, possibly requiring preprocessing of the target, and also introduces undesired artifacts. These two approaches are extensively evaluated by building an image database composed of 161 high‐dynamic‐range images.     

An optical design for reflective color STN‐LCDs

In reflective color STN‐LCDs, it is necessary to achieve achromatic representation in single‐polarizer STN‐LCD modes. We propose an optimization method for the optical components of single‐polarizer STN‐LCD modes in order to achieve achromatic representation. By applying this method, it is shown that a contrast ratio of more than 20 can be achieved in the normally black (NB) mode. Furthermore, we prove that the normally white (NW) mode can be realized as well as an NB mode which is usually used in current reflective color STN‐LCDs. Comparing the viewing‐angle characteristics of the NW and NB modes, it was found that those of the NW mode are better than those of the NB mode. Particularly, high reflectance can be realized even at larger viewing angles in the NW mode.