Custom Segment LCD Display Transflective RGB Color Backlight
Detail Information
| LCD Type: | TN, Positive |
| Viewing Angle: | 6 O'clock |
| Operating Temperature: | 0~+50℃ |
| Connector: | Zebra |
| Voltage: | 3.0V |
Detailed Parameters:
| NO. | ITEM | SPECIFICATIONS |
| 1 | LCD Type | TN positive, transflective |
| 2 | Viewing Angle | 6 O'clock |
| 3 | Drive Method | 1/4 Duty, 1/3 Bias, 3.0V |
| 4 | Operating Temperature | 0~+50℃ |
| 5 | Storage Temperature | -10~+60℃ |
| 6 | Connector | Zebra |
| 7 | LED Backlight | RGB colors |
| 8 | Outline Dimension | 25.1(W)* 25.1(H)* 2.8(T) mm |
| 9 | LCD View Area | 21.91(W)* 19.91(H) mm |
The custom segmented LCD (segmented liquid crystal display)
combined with transparent RGB color backlight is a display solution
that integrates the low power consumption and high contrast
characteristics of segmented LCD with the adjustable color
advantage of RGB backlight. It is suitable for scenarios that
require flexible color expression and have fixed display content
(such as numbers, icons, simple characters), such as instrument
panels, smart home control panels, and in-vehicle small screens.
Here are the relevant technical points and implementation ideas:
I. Core Components
Customized Segmented LCD Panel
Design the display segments (number fields, symbol segments, icon
segments, etc.) according to requirements, customize the electrode
layout through lithography or etching processes, use TN, STN or VA
mode liquid crystal, ensuring clear segment display with high
contrast, and supporting backlight transmission (requiring
high-transmittance liquid crystal materials and polarizing films).
RGB Backlight Module
Light Source Type: Commonly RGB LED (combination of multiple
single-color LEDs or integrated RGB LED), or use RGB OLED
(self-luminous, thinner but more expensive).
Drive Method: Control the brightness of the red, green, and blue
channels through PWM (pulse width modulation) to achieve 1670
million color mixtures (24-bit color depth), and need to be paired
with RGB backlight driver chips (such as TI's LP5523, NXP's
PCA9635, etc.).
Transparency Design: The backlight module needs to be aligned with
the LCD segments (to avoid light leakage), adopt a light guide
plate + diffusion film structure to ensure uniform light
transmission through the LCD segments, and the non-display area can
be blocked by a shading layer to enhance contrast.
Driver Circuit
LCD Driver: Use segmented LCD driver chips (such as Holtek's
HT1621, TI's CD4056, etc.), control each segment's on/off (on /
off) through COM (common terminal) and SEG (segment terminal).
RGB Backlight Control: Output PWM signals from the MCU (such as
STM32, Arduino) to the backlight driver chip to achieve color
switching, brightness adjustment or dynamic effects (such as
breathing, gradient).
II. Key Technical Points
Transparency Optimization
Select high-transmittance polarizing films (such as
semi-transmissive or fully transmissive type) for LCD panels, and
do shading treatment for non-display segment areas (such as black
ink printing), reducing environmental light interference while
ensuring that the backlight only transmits through the display
segments.
The design of the light guide plate of the backlight module needs
to match the distribution of LCD segments to avoid light leakage in
non-display areas and affect the display effect.
Color Consistency and Calibration
Due to the individual differences of RGB LEDs (wavelength,
brightness), software calibration (such as white balance
adjustment) is required to ensure consistent color display across
different devices.
Adding current feedback to the driver circuit stabilizes the LED
working current, avoiding color deviation caused by voltage
fluctuations.
Low Power Consumption Design
The segmented LCD itself has extremely low power consumption
(microampere level), with the backlight being the main power
consumption source. Dynamic control of backlight brightness (such
as dimming when ambient light is strong, turning off during sleep)
or the use of low-power RGB LEDs (such as below 0.1W) can be
adopted.
Dynamic Effect Realization
Through MCU programming, control the PWM duty cycle of the RGB
channels to achieve color switching (such as red alarm, green
normal), gradient transition, flashing prompts, etc., enhancing the
human-computer interaction experience. III. Application Scenarios
Instrumentation: Such as multimeters and thermometers, use
different colors to distinguish measurement ranges (e.g., red for
upper limit, green for normal).
Smart home: Status indicators on the control panel (such as
different colors for air conditioning operation modes).
Vehicle-mounted equipment: Small screens on the dashboard display
fuel level, water temperature, etc., and indicate abnormalities
through color changes.
Consumer electronics: Battery power display, work status indication
of small appliances, etc.
V. Development Process
Determine display requirements (segment layout, size, resolution),
customize segmented LCD panels.
Design RGB backlight modules (number of light sources, layout,
driving method), match LCD size and segment distribution.
Build driving circuits (LCD driver chip + RGB backlight driver +
MCU), write control programs (segment display logic + color control
algorithm).
Debug light transmission and color effects, optimize backlight
uniformity and power consumption.
By this solution, both the simplicity and stability of segmented
LCD can be retained, and the color flexibility of RGB backlight can
be utilized to achieve the combination of functionality and visual
experience.
