9. Fonts are not clear on LCD User Guide

Fonts are not clear on LCD

1. Problem phenomenon

During the experiment, it was found that some of the fonts displayed on the display screen were very dim, and some were almost white, so it was difficult to see the font.

2. The cause of the problem

In fact, it is caused by the contrast of the screen. Due to the individual differences of the products shipped from the factory, some products need to adjust contrast ratio before they can be displayed normally.

3. Solution

Open the code to initialize the LCD function. The last parameter is to set the contrast ratio. Modifying the contrast ratio appropriately can solve the problem.

Contrast ratio is stored in the contrast variable, we can directly modify the value of the variable, the range of contrast is 30-90.

Then, re-compile the project and run the program to see the effect.

TAG： Raspberry Pi 5 Case Computer AI Deepseek Mechanical Voice Keyboard Linux 10x0.85inch LCD Screen Customize keys + 2.01 inch Secondary Display Raspberry Pi 5 Gen3 Computer Monitor Screen SpotPear BPI-M4 Zero Jetson Nano Development Industrial Isolated Converter Raspberry Pi 5 D Raspberry Pi 5 User Guide Raspberry Pi USB Global Shutter Camera 1MP OV9281 120fps Black/White 120fps also For Jeston RDK Flash Firmware Flashing and Erasing User Guide Sipeed NanoCluster Mini Cluster Board mini data center For Raspberry Pi CM45 / Computer /LM3H /M4N Milk-V Duo Camera Tutorial Pico-DALI2 Expansion Board For ESP32 C6 S3 DALI communication control multiple LED Intel 12th Raspberry Pi Pico 2 RP2350/RP2040 W5100S-EVB-Pico W6300-EVB-Pico2 Ethernet Development Board ETH RJ45 ESP32-S3 A7670E 4G development board supports LTE Cat-1/2G/GNSS positioning/WiFi/Bluetooth ESP32-S3 1.69inch LCD Display With QST Attitude Gyro Sensor QMI8658C For Arduino Python Industrial Modbus POE ETH RJ45 To 8-Ch Relay B RTU/Modbus TCP-Ethernet For IOT

Raspberry Pi 1.6 inch Display Module with Backlight, for raspberry pi Zero/1B/2B/3B /3B+/4B

TAG： ESP32-C6 AI Voice Chat Robot For Xiaozhi 1.8 inch AMOLED Development Board 1.8inch TouchScreen Deepseek Raspberry Pi 5 PCIe WIFI7 Google TPU BE200 AX210 AI RM520N GL IoT EMBB 5G 4G 3G M.2 LTE-A/NSA SA GNSS DFOTA VoLTE Quectel Raspberry Pi 5 Case Raspberry Pi RP2040 LoRa Pi5 Active Cooler Raspberry Pi 5.83 inch e-Paper link (G) Arduino Jetson Nano STM32 Ra Computer USB Monitor Screen NVIDIA Jetson Nano Mini Computer Development WiFi 4G Module Raspberry Pi PICO Long-Range Communication Spotpear FT4232HL USB TTL RS232 Industrial UART 4-Ch UART ESP32 IR Thermal Imaging Camera VisionFive2 Fan Core1121 LoRa LR1121 HF LF SPI For Sub-GHz and 2.4GHz STLINK ESP32 S3 4.3inch LCD 800x480 Captive TouchScreen Display Board LVGL Sensor CAN I2C RS485 Raspberry Pi IR Thermal Imagi Raspberry Pi 10.1 inch DSI LCD TouchScreen Display 800x1280 RK3576 RK3506 ESP32-P4 Luckfox Lyra