Japanese EPSON Epson HUD Automotive Head Up Display System Chip

Mar 27,2024
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At present, the assembly rate of HUD products on new cars is increasing year by year, and it is expected to reach 30% by 2025. So before introducing the Epson HUD integration solution, let's first understand what HUD is.HUD (Head Up Display) is called Head Up Display System in Chinese, also known as Parallel Display System. It has long been applied in aircraft assisted driving, and through the centralized projection of parameters, it helps drivers to grasp important driving information without looking down at instruments, avoiding frequent looking down at instruments or onboard screens during driving, which plays a good auxiliary role in driving safety. After the introduction of this technology to automobiles, it went through a period of decline. With the advancement of technology and the support of AR technology, HUD returned to the public's view and began to develop rapidly.

▲ AR-HUD simulation diagram ▲

The working principle of a car head up display system is generally to project relevant information of the vehicle onto the windshield or dedicated display screen in front of the driver through optical reflection or projection technology. Specifically, it typically includes the following main components:1. Sensor: used to detect data such as vehicle speed, rotational speed, navigation information, etc.2. Processor: Process and analyze the data collected by sensors, and convert it into a format suitable for display.3. Projector: The processed information is projected optically onto the windshield or display screen.

4. Reflective shackles or lenses: Use dry adjustment and focusing of projected light to form a clear image within the driver's line of sight

5. Windshield: acts as a carrier for displaying images, allowing it to reflect or transmit the light emitted by the projector through special processing.

Through the collaborative work of these components, the car head up display system can directly present key information in the driver's field of view, helping them to obtain the required information more conveniently and quickly, while reducing the time it takes for their eyes to leave the road and improving driving safety.

The safe operation of HUD is influenced by various factors. Below, we will introduce the significant impact of the overall system of Epson HUD chips, crystal oscillators, and gyroscopes on HUD.

4. Reflective shackles or lenses: Use dry adjustment and focusing of projected light to form a clear image within the driver's line of sight5. Windshield: acts as a carrier for displaying images, allowing it to reflect or transmit the light emitted by the projector through special processing.Through the collaborative work of these components, the car head up display system can directly present key information in the driver's field of view, helping them to obtain the required information more conveniently and quickly, while reducing the time it takes for their eyes to leave the road and improving driving safety.The safe operation of HUD is influenced by various factors. Below, we will introduce the significant impact of the overall system of Epson HUD chips, crystal oscillators, and gyroscopes on HUD.

▲ HUD Principle Block Diagram ▲

HUD mainly consists of three components:

Video host+HUD chip module+LCD display screen.

What are the characteristics of Epson HUD chips?

Image correction: Due to the inclination and curvature of the windshield, direct projection can cause distortion of the image. The Epson HUD chip uses mature correction technology to preprocess the image, allowing it to perfectly project onto the windshield EPSON S2D13V40 HUD correction chip

Function introduction: Surface correction TCON. The core is Warp (surface correction) engine, which is used to correct images displayed on surfaces

Security measures:Due to HUD imaging on the windshield or road, if the data or navigation instructions are incorrect, it can easily mislead the driver and cause traffic safety accidents. In order to enhance security attributes, Epson HUD chips are equipped with multiple monitoring functions:1. Host communication, register signal monitoring2. Video data, resolution monitoring3. Clock signal monitoringDriving safety has always been the top priority for Epson, and we hope to promote this concept to our customers through high safety products.Clear screen:During the driving process, factors such as light and weather constantly change, causing a significant impact on the imaging of HUD. To address this pain point, the Epson HUD chip has added two new functions:1. High resolution: 1280 * 720 resolution2. Local dimming: Real time calculation of the image, dynamically adjusting the backlight brightness of the area based on the image content, increasing contrast, improving safety, and reducing power consumption.

Epson HUD chips have been supplied to multiple leading car manufacturers, as there are currently two main models being promoted: 52D13V40/52D13V42. The specific specifications and parameters are as follows:

Why does the HUD system require a gyroscope?Angular velocity sensor, also known as gyroscope sensor °. EPSON uses double T-shaped crystals as the material for detecting angular velocity and belongs to electronic gyroscopes; When the chip rotates at a certain angle, the internal T-shaped crystal undergoes deformation, and a voltage is generated when the pressure changes. The chip detects the voltage change and outputs the corresponding output. In AR-HUD, navigation information needs to be presented on the road. During driving, it is inevitable to encounter undulations on the road surface, causing navigation instructions to deviate from the actual environment. Adding a gyroscope to the HUD module can compensate for state shift and maintain stable image position.

We recommend using Epson automotive grade gyroscopes, which comply with AEC-Q200 certification. Multiple packaging and interfaces are available for selection. The recommended model is the XV4001 series. Specification parameters:

For the field of autonomous driving, Epson has also launched the+Yaw Solution Proposal for Automotive. Epson also has gyroscopes such as XV7181BB, IMU inertial navigation M-G366, M-G370, etc.

Car grade crystal oscillators make HUD more stable. For the stable operation of chips, high-performance crystal oscillators are essential. Car grade crystal oscillators have the characteristics of high reliability, low power consumption, and small packaging, and have passed AEC-Q200 certification, making driving more reassuring. Recommend using SG2016CAA and SG2520CAA programmable active crystal oscillators with HUD chips.

Specification parameters:

HUD can greatly improve the driving experience and safety assurance. Although it is currently more common in mid to high end models, we believe that with the maturity of technology and the decrease in costs, it will definitely become a standard feature in cars in the future. Several domestic and foreign automotive parts manufacturers have already cooperated with Epson, and we believe that the Epson integration plan will play an indispensable role in the development process of HUD.