LCD Gamma Buffers Integrated Circuit
An LCD Gamma Buffer is an analog or mixed-signal IC designed to optimize color and brightness performance in liquid crystal displays. Think of it as a “precision voltage supplier.” It generates highly stable reference voltages for Source Driver ICs. These drivers then convert digital image signals into analog voltages to control the tilt of liquid crystal molecules.
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(from leading manufacturers)
International LCD Gamma Buffers Manufacturers and Key Models
1. Texas Instruments (TI)
TI is the market leader. Its BUF series is the industry standard.
- Programmable Gamma (P-Gamma):
- BUF22821: 22-channel, integrated EEPROM. Ideal for high-end UHD panels.
- BUF20800 / BUF20820: 18-channel, supports 10-bit resolution.
- BUF16821: 16-channel with high-speed I2C.
- BUF12840 / BUF12800: 12-channel with Two-Bank Memory for fast mode switching.
- BUF08832 / BUF08821: 8-channel, high slew rate. Common in tablets.
- Static/Traditional Gamma:
- BUF11704 / BUF11705: 10+ channel static buffers.
- BUF07704 / BUF06703: 6-7 channel medium precision buffers.
- Vcom Driver:
- BUF01900: Single-channel programmable Vcom generator.
2. Renesas (formerly Intersil)
Renesas acquired Intersil, gaining the ISL series. They excel in automotive and industrial displays.
- P-Gamma:
- ISL24813: 18-channel programmable reference generator.
- ISL76534: Ultra-low power, AEC-Q100 certified for automotive use.
- ISL24832 / ISL24835: Multi-channel solutions with integrated Vcom.
- Integrated (Gamma + Vcom):
- ISL24858: 15-channel Gamma + 1-channel Vcom driver.
3. Analog Devices (formerly Maxim Integrated)
The MAX series is known for high precision and low power. They are popular in high-end systems and mobile devices.
- P-Gamma:
- MAX9620: 24-channel. Designed for professional monitors.
- MAX9599A / MAX9599: 14-channel, 10-bit programmable with MTP memory.
- MAX9669: 10-channel programmable buffer with non-volatile (NV) storage.
- Integrated:
- MAX9668: 10-channel Gamma + Vcom integrated IC.
- MAX1512: Classic early model with Vcom adjustment.
4. ROHM Semiconductor
ROHM is a staple in Japanese supply chains. They specialize in integrating Gamma buffers with Power Management ICs (PMICs).
- BD8149MUV: 10+ channel Gamma correction for TFT-LCDs.
- BD81849MUV-C: Automotive-grade, optimized for extreme temperatures.
- BD8105GW: Low-channel buffer for mobile/wearable devices.
- BD8119FM: Multi-function IC (DC-DC converter + Gamma).
5. ams OSRAM
They provide classic static Gamma models with long lifecycles.
- AS15-F / AS15-G / AS15-HG: 14-channel static design. Extremely common in the TV repair market due to cost-efficiency.
Selection Logic Quick Reference Table
| Application | Recommended Brands | Key Models | Core Advantage |
| High-end TV (4K/8K) | TI / ADI | BUF22821 / MAX9620 | High channel count (22-24ch), Precision |
| Automotive Display | Renesas / ROHM | ISL76534 / BD81849 | AEC-Q100 certified, Thermal stability |
| Mobile/Tablets | TI / ADI | BUF08832 / MAX9599 | Low power, Small footprint (QFN/TQFN) |
| Repair/Cost-sensitive | ams OSRAM | AS15-F | Mature architecture, Low cost |
Chinese LCD Gamma Buffers Manufacturers and Models
Chinese suppliers focus on high integration (combining Gamma, PMIC, Vcom, and T-CON) and aggressive pricing.
- Chipone: A leader in display drivers. Products are used by BOE and CSOT.
- iML8xxx Series: (e.g., iML8811, iML8826) Classic P-Gamma chips.
- ICN9xxx Series: PMICs with integrated Gamma buffering.
- ESWIN: Founded by Wang Dongsheng (ex-BOE Chairman). Strong in large TV panels.
- E8 Series: Integrated Gamma solutions often bundled with T-CON chipsets.
- ViewSilicon: Deep expertise in notebook and tablet markets.
- NV30xx / NV6xxx Series: Specialized in Gamma correction and PMIC integration.
- SinoWealth: Strong in industrial displays and home appliances.
- SH1xxx Series: Mature solutions for industrial-grade stability.
- Fitipower: Deeply embedded in the mainland supply chain.
- FP67xx Series (e.g., FP6721): Popular TI BUF series replacements in the white-box and repair markets.
Chinese Model Cross-Reference and Replacement Logic
| International Brand/Model | Recommended Chinese Alternative | Replacement Logic / Advantage |
| TI BUF16821 / BUF22821 | Chipone (iML) / Fitipower | Pin-to-pin compatible; >30% cost reduction. |
| Intersil ISL24835 | ESWIN / ViewSilicon | Enhanced Vcom integration for large panels. |
| ams AS15-F (Static) | Various Chinese Buffers | Replaced by integrated Source Drivers; used for repairs. |
LCD Gamma Buffers Core Functions and Application Scenarios
Core Functions
- Gamma Correction: Maps digital signals to the non-linear brightness perception of the human eye. Ensures natural, smooth grayscale.
- Driving Capability: Provides high current to maintain stable reference voltages for high-resolution panels, preventing ghosting.
- Color Consistency: P-Gamma chips allow software-based calibration to eliminate color variance between panel batches.
Typical Scenarios
- Consumer Electronics: 4K/8K TVs, professional design monitors, and HDR-enabled laptops.
- Automotive: Digital cockpits and instrument clusters. Requires AEC-Q100 reliability to keep icons clear in extreme heat.
- Medical Imaging: X-ray and CT displays. Requires 10/12-bit depth for precise diagnostic grayscale.
- Industrial/Professional: Control panels and outdoor signage. Ensures readability in complex lighting.
Detailed LCD Gamma Buffers Classification
| Classification | Characteristics | Key Models | Manufacturers |
| Programmable (P-Gamma) | I2C control, DAC/EEPROM integrated. Software-calibrated. | BUF16821, ISL24832, MAX9669 | TI, Renesas, ADI |
| Static Gamma | Fixed by external resistors. Low cost. | AS15-F, BUF07420 | ams OSRAM, TI |
| High Channel (12-24ch) | For 4K/8K TV and Pro monitors. | MAX9620, BUF24033, ISL24813 | ADI, TI, Renesas |
| Gamma + Vcom | Integrated Gamma and Vcom drivers. | MAX9668, ISL24858, BUF12800 | ADI, Renesas, TI |
| PMIC Integrated | Gamma integrated into Power Management. | BD8119FM, TPS65161 | ROHM, TI |