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4.3-inch TFT LCD is one of the sizes with the highest demand in the display industry. Because of its moderate size and superior display performance, it can adapt to the needs of customers in different industries and has sufficient market competition in price. It has always been one of the most mainstream size.   Firstlly，4.3 inch means that the diagonal length of the TFT LCD screen is 4.3 inch (about 10.92 cm), which is the physical size of the screen.                                                     Then, Resolution describes the number of pixels that the screen can display in the horizontal and vertical directions.  What resolutions does 4.3-inch TFT have? How should we choose when selecting solution?   Common resolutions The most common resolutions of 4.3-inch TFT display include 480*272 resolution and 800*480 resolution: 4.3 inch 480*272  TFT LCD: Features:  This 480*272 resolution is the most conventional resolution. TFT display manufacturers have been in mass production for many years. The supply is stable, the price is competitive, and it has a high cost performance. Applicable scenarios:  Suitable for applications that do not have particularly high display requirements, such as basic text display, simple graphical interface, etc. 4.3 inch 480*272  TFT LCDs are generally more optimized in terms of cost and power consumption, making them suitable for some devices with limited budgets or strict power constraints.   4.3 inch 800*480 TFT LCD: Features:  The high resolution 800*480, providing higher definition and able to present more delicate images and video effects. Applicable scenarios:  Suitable for occasions requiring high-definition display, such as high-definition video playback, image processing and other applications. Many high-end smart products will choose this resolution as their display terminal. In addition, this resolution is also divided into two options: landscape mode 800*480 and portrait mode 480*800, which can be selected according to specific needs.   Selection suggestions: 1. Select according to application requirements: If the device is mainly used for text display or simple graphical interfaces and has high requirements on cost and power consumption, it is recommended to choose a 4.3 inch 480*272 resolution display. If the device needs to display high-definition images or videos and users pursue a better visual experience, it is recommended to choose 4.3-inch 800*480 TFT LCD. 2. Consider hardware support: High-resolution screens require more powerful hardware support to drive, so when selecting, you need to ensure that the device's processor and graphics card performance are capable of meeting the display requirements of the selected resolution. 3. Budget considerations: Generally speaking, high-resolution displays are relatively expensive. Therefore, it is necessary to comprehensively consider budget factors when selecting a model to ensure that the selected solution meets the needs and has a good cost performance. 4. Compatibility and stability: When selecting, you also need to consider the compatibility and stability of the display and the device. It is recommended to choose brands and models that have been proven by the market and have a good reputation to ensure product reliability and stability.   In summary, 4.3 inch TFT LCD display has a wide range of applications, covering industrial control, medical equipment, smart home, automotive electronics and many other fields. Users can choose appropriate resolutions and display solutions based on specific application requirements to meet different display needs.   We Shengfeng produces and supplies various 4.3 TFT LCDs with resolution options of 480*272, 480*800, and 800*480. We can customize according to customer needs, select driver ICs and interfaces such as RGB interface, MIPI interface, and design and customize FPC/backlight/RTP/CTP air bonding/optical bonding solutions as required.

In today's modern digital era, display technology has indeed become an integral part of our lives. As the most popular used display technologies, TFT LCD display and OLED display are featured with their unique characteristics. TFT LCD, based on Thin Film Transistor Liquid Crystal Display technology, it illuminates the liquid crystal layer through a backlight source to display images. It is also one of the most widely used LCD display technologies.   TFT LCD Advantages: Low Cost: TFT LCD display is more economical than OLED due to its lower production cost.  High Brightness: TFT LCD display offer high brightness, suitable for use in bright environments. Long Lifetime: Compared to OLED display, TFT LCD have a longer lifetime and are less prone to burn-in issues.  Eye-friendly Usage: LCD display(including TFT LCD) typically use DC dimming technology, which helps reduce screen flickering and is gentler on the eyes.   TFT LCD Disadvantages: Slow Response Time: TFT LCD has a relatively slow response time, which may cause ghosting when displaying dynamic images. Narrow Viewing Angle: Standard TN-type TFT LCD has a narrow viewing angle, where image colors and contrast may change when viewed from different angles. High Power Consumption: The backlight of TFT LCD consumes significant power, affecting battery life.     OLED Display:  it is a thin film made of organic light-emitting materials that emit light directly when an electric current passes through, eliminating the need for a backlight module. AMOLED technology is similar to OLED but uses an active matrix as the bottom film, enabling it to display finer images and clearer text.   OLED Advantages: Color & Contrast: OLED display is renowned for its exceptional color saturation and contrast, achieving true blacks and infinite contrast ratios. Fast Response Time: OLED display has extremely fast response times, virtually eliminating ghosting in dynamic images, providing a smoother visual experience. Wide Viewing Angle: OLED has a significant advantage in viewing angles, with minimal impact on image color and brightness when viewed from different angles. Flexibility: OLED display can be flexible, enabling innovative usage scenarios such as foldable or curved screens. Low Power Consumption: Without a backlight, OLED is energy-efficient, ideal for portable devices. Thin Thinness: Without a backlight, OLED could be lighter and thinner.   OLED Disadvantages: Shorter Lifetime: OLED display have a relatively shorter lifespan due to the vulnerability of their light-emitting materials to oxidation and humidity. High Manufacturing Costs: The high manufacturing costs of OLED display contribute to the higher prices of some electronic devices. Eye Strain: OLED's self-emissive nature may put more strain on the eyes, especially after use for a long time.     To choose TFT LCD or OLED dislay? Users Need to consider:  --Budget: If your budget is limited, TFT LCD screens may be a more suitable choice. --Color & Image Quality: If you prioritize image quality, viewing angles, and response speed, and your budget allows, OLED display are the better option. --Lifestime: If you want a device that can last long without frequent screen replacements, TFT LCD display may better suit your needs. --Innovative Design: If you're interested in innovative designs like foldable or curved screens, OLED display are indispensable.   Both TFT LCD and OLED display have their unique strengths, and the choice between them depends on specific user needs and budgets in different usage scenarios.  

As numbers of smart products continues to grow, an increasing variety of terminal products for different industries and usage environments have emerged into people's view, and the requirements for LCD displays have also gradually escalated, such as in industrial handheld terminals, walkie-talkie devices, instruments, and so on. Since these devices are often used outdoors, the relevant LCD displays are required to remain clearly visible under sunlight to facilitate accurate operations.   What Makes LCD Readable Under Sunlight? For an LCD to be readable in the very bright outdoor environment, the brightness of the LCD screen needs to exceed the intensity of light reflected from the display surface. To be comfortably visible to the human eye, the brightness of the LCD should be at least 2.5 times that of its reflected light.   How to Achieve LCD Sunlight Readable? It is approached from two aspects: increasing brightness or reducing reflection.   1. Increasing Backlight Brightness to Create High-Brightness Displays Advantages: Directly enhances screen brightness to ensure clear visibility in bright environments. Disadvantages: Increases power consumption, size, and cost, and may shorten backlight lifespan due to the higher current and denser LED arrangement required. Applications: Ideal for outdoor use, especially for devices that are not extremely sensitive to power consumption and cost, such as industrial handheld terminals and outdoor advertising boards.   2. Using Optical Bonding to Reduce Reflection Advantages: Improves contrast by reducing specular reflection, without significantly increasing backlight brightness, thus maintaining lower power consumption and cost. Disadvantages: Requires precise optical design and high-quality optical adhesives, increasing manufacturing complexity and cost. Additionally, it may have limited environmental adaptability, performing less optimally at extreme angles or in extreme weather conditions. Applications: Suitable for outdoor devices that require high contrast but do not want to excessively increase power consumption and cost, such as high-end walkie-talkies and professional instruments. 3. Using Transflective LCD Advantages: Can utilize ambient light as a light source, enhancing outdoor display brightness while reducing backlight usage and saving energy. Disadvantages: Displays less optimally indoors or in low-light environments. Additionally, the partially reflective mirror layer blocks some backlight, compromising indoor display performance. Transflective LCDs are also more expensive than fully transmissive LCDs. Applications: Ideal for devices that need good display performance both outdoors and indoors, with some tolerance for higher costs, such as portable navigation devices and outdoor adventure equipment. 4. Using Anti-Reflection (AR) and Anti-Glare (AG) Films or Circular Polarizers Advantages: AR films reduce reflection on the screen surface, improving visibility; AG films diffuse reflected light, reducing glare; circular polarizers further reduce reflection and enhance color performance. These methods are usually cost-effective and easy to implement. Disadvantages: May require periodic replacement or cleaning to maintain optimal performance, especially in heavily polluted outdoor environments. Applications: Widely applicable to various LCD screens requiring improved readability under sunlight, such as smartphones, tablets, and in-vehicle displays.   There are various methods to improve the readability of LCD screens under sunlight, each with its unique strengths and limitations. The most suitable approach depends on the specific use case and device requirements.

Taking an LCD screen with a capacitive touch screen as an example, the overall structure of the display module can be roughly divided into 3 parts. From top to bottom, they are the protective cover glass, the touch screen, and the display screen. The way to glue these 3 parts together is bonding. There are two methods: Optical bonding and Air Bonding.    Optical Bonding Definition:  Optical Bonding refers to the technology that uses transparent optical glue, liquid OCA glue, OCA glue or SCA glue) to completely bond the touch screen and display screen together seamlessly to form a whole screen. The bonding strength is greatly increased.   Advantages:  Good display effect: the air layer between the screens is reduced, light reflection and loss are reduced, the brightness and contrast are improved, and the display image is clearer and brighter. All-in-one black effect: The boundary between the display area and the non-display area is not obvious, which is conducive to the overall black effect when the entire module is not lit.  Higher brightness: OCA glue fills the gaps, reduces light reflection loss, maintains the cleanliness of both screen, and makes the display effect better.  Low interference: The touch screen and display panel are closely integrated to reduce noise interference on touch signals and improve touch fluency. Improved durability: Optical bonding is beneficial to the stable performance of the SENSOR, and also improves the shock resistance of the entire module, effectively extending the product life of the entire module in harsh environments.  Thinner thickess: The overall thickness is reduced through optical glue bonding, making the device thinner and lighter with narrower borders.    Disadvantages:  Complex process: The production process is complex and requires high technology.  High cost: material costs and manufacturing costs are high, and repair costs after damage are also high.     Air Bonding Definition:  it is also known as Double-tape adhesive bonding, that is, simply sticking the touch screen and the four sides of the display screen with double-sided tape. The middle of the two screens is empty and has air.   Advantages:  Low process cost: The process is relatively simple, just use double-sided tape on the four sides of the screen for bonding, and the production cost is low.  Low maintenance costs: The touch screen and display screen are separate, and damage to one piece will not affect the use of the other, reducing maintenance costs.   Disadvantages:  Poor display effect: there is a gap between the two screens, which is easy to reflect light and dust may enter, and the light from the display screen will be filtered, affecting the visual effect.  Easy to get dust in: Because there is a gap in the middle, dust and dirt can easily enter, affecting the screen cleanliness and display effect.    For different type touch screen,  generally it is air bonding for RTP touch( Resitive touch panel) and LCD screen. Either optical bonding or air bonding for CTP touch(Capative touch panel) and LCD screen.   In summary, choosing Optical bonding or Air bonding mainly depends on the positioning and needs of the product. For devices that pursue the ultimate visual experience and high reliability, full fit is a better choice. For applications that are cost-sensitive or do not require excessive display effects (such as some entry-level equipment or specific industrial equipment), frame stickers are a more cost-effective solution.   Optical Bonding Air Bonding   Air Bonding vs Optical Bonding      

The display modes of LCD (Liquid Crystal Display) primarily encompass reflective mode, transmissive mode, and transflective modes (also known as transreflective mode), with these modes intimately related to the selection of backlight solutions. Below is a detailed analysis of these three LCD display modes and the choice of backlight schemes: Reflective Mode . Transmissive Mode   Transflective Mode     Reflective Mode : （Reflective LCD） Features: Display content relies on ambient light sources for illumination, hence this type of LCD does not require backlighting. Reflective LCDs feature reflective rear polarizers, allowing only light from the front of the LCD to be projected onto it, making them suitable for environments with available light sources. Applications: Commonly used in brightly lit environments, such as electronic readers and watches under direct sunlight outdoors. Advantages: Eliminates the need for backlighting, resulting in low energy consumption, ideal for use in well-lit environments.   Transmissive Mode: (Transmissive LCD) Features: Transmissive LCDs have transmissive front and rear polarizers, allowing most backlight rays to pass through both polarizers and the LCD cell, reaching the viewer's eyes for display. This type of LCD is suitable for dimly lit environments. Application: Ideal for workspaces without ambient light sources, relying on an external backlight source, such as indoor applications. Advantages: Capable of providing clear display effects in poorly lit environments.   Transflective Mode:  (Transreflective mode, Transreflective LCD) Features:  Transflective LCDs combine features of both reflective mode and transmissive mode, incorporating both backlighting and reflective polarizers. As a result, this type of LCD is suitable for both brightly lit outdoors and dimly lit indoors. Applications: Perfect for environments with varying light conditions, such as outdoor applications and car displays. Advantages: Integrates the strengths of both reflective and transmissive modes, ensuring stable display performance under different lighting conditions.   The choice of LCD display mode and backlighting scheme depends on specific application scenarios and requirements. Reflective mode is suitable for well-lit environments without the need for backlighting; transmissive mode excels in dimly lit environments, necessitating LED backlighting; whereas transflective mode combines the benefits of both, catering to environments with significant light variations. When selecting a backlighting scheme, factors such as cost, brightness, color performance, and power consumption must also be taken into consideration.

  COG (Chip-on-Glass) is an advanced packaging technology for electronic components, particularly suitable for the packaging of LCD (Liquid Crystal Display) driver IC. In this technology, the driver IC is directly bonded onto the glass substrate, then the kind LCD module is called COG LCD module.  The whole COG LCD module is consisted of 3 parts, including LCD panel, COG driver IC and the connector of FPC or PIN, as showed.    Compared with other traditional COB, SMT type module, COG display module features with advantages: Small Size COG technology significantly reduces the size of products. Since the driver ICs are directly bonded on the LCD glass, no need for components such as PCB boards and fixed pins, enabling a more compact product design. This miniaturization not only helps reduce the volume, weight, and thickness of COG display module but also promotes thinner device designs.   Compactness COG type IC enhances the compactness of products. The LCD internal layout is directly connected to the pins of the COG IC, eliminating the need for connecting wires and space required by traditional packaging methods such as COB and SMT structures. This compact design makes the entire display module more concise and efficient.   High Reliability COG packaging technology also enhances the display module’s reliability. The direct connection between the COG driver IC and the LCD layout, along with the full coverage of the bonding area with black glue, makes the display module endurable to environmental factors such as air, humidity, and temperature. Additionally, as COG IC requires bonding process once only, reducing the possibility of failure possibility.   Low Power Consumption In terms of power consumption, COG modules also have good performance. Since the COG driver ICs are directly bonded on the LCD glass substrate, the signal transmission path is minimum shortened, reducing energy loss and achieving lower power consumption.   Fast Response COG packaging technology features fast response characteristics. Due to the shorter distance between the IC and the LCD panel, signal transmission is faster, resulting in faster response speeds and refresh rates.   Design Flexibility COG driver ICs are small in size and can be adjusted according to design needs, allowing them to be placed on any side of the LCD panel. This design flexibility makes COG display module adaptable to various application fields and LCD technology.   Cost-effectiveness Compared with COB, SMT type module, COG LCD module also offers significant cost benefits. Its essential simple structure of LCD+COG IC+FPC, ,the elimination of PCB boards and other components has reduced material and manufacturing costs. At the same time, the highly automated COG bonding production line has improved the yield rate, reduced waste losses, and further enhanced cost-effectiveness.   In summary, the COG display module, with its significant advantages such as thin design, high reliability, design flexibility, and cost-effectiveness, has become the preferred choice for many electronic equipment applications. Whether it's consumer electronics, industrial equipment, or medical devices, the COG display module can provide excellent display effects and stable performance.      

Monochrome Liquid Crystal Display (LCD) is one of LCD display technology that can only display a single color. Different from colorful TFT display,  This type of monochrome LCD display typically presents background/image variations of only one color, such as white, green, red, etc. Its structure is illustrated in the figure below: Based on the different monochrome LCD technologies, they can be classified into three main categories: TN (including HTN), STN (including FSTN, DFSTN), and VATN LCD. TN( Twisted Nematic) technology, whose liquid crystal molecules are typically twisted at a 90° angle inside LCD cell. STN( Super Twisted Nematic) technolgy, features a larger twisting angle typically reaching 240°, compared to TN technology . VATN technology, differs from the conventional TN/STN liquid crystal technologies in terms of twisted orientation and crossed polarizers. VATN LCD employs a vertically aligned liquid crystal molecule structure, where the liquid crystal molecules are perpendicular to the electrodes on the LCD substrate. In power off state, the arrangement of VATN liquid crystal molecules is perpendicular to the glass substrate, unlike conventional TN/STN LCDs. This alignment blocks light from passing through the polarizers, resulting in a deep black color. However, when a voltage is applied on both sides, the liquid crystal molecules begin to tilt and collapse, allowing the previously blocked light to penetrate the polarizers, exhibiting a pure white color. This significant enhancement in contrast ratio makes VATN technology visually superior to TN technology. Features of VATN LCD Technology： Advanced Visual Effect: a pure black background for enhanced product elegance. High Contrast: Ultra-high contrast ratio reaching up to 500 or even 1200:1 Ultra-Wide Viewing Angle: Wider viewing angles compared to TN and STN technologies, and full-view VA up to 180° Wide Operating Temperature: with operating temperatures range -30 to 85℃, feasible for automotive applications.   VATN LCD with Color 1.VA LCD with color backlight The most classic visual effect of VA LCD is white text-on pure black background, with the highest contrast. While the backlight of VA LCD is not limited to white. It can also be paired with backlights of other colors, such as red, green, and blue, to create different visual effects. By changing the color of the backlight, VA LCD module could present a richer and more unique color representation, meeting the needs of different application scenarios.   2.VA LCD with color filter or color printing   VA LCD can be also added with color silkscreen printing or color filter technology to enrich the color palette of the fixed displayed content, for example icon, buttons,. This application not only enhances the attractiveness and visual impact of the display but also satisfies user demands for colorful and vivid content. Application Fields: With its high contrast ratio and wide viewing angles, VA LCD has become the popular LCD technology solution in the monochrome display market. It is widely used in various consumer electronics, white goods, smart homes, industrial equipment, and automotive products.