Capacitive Touch Display 10.1" LVDS Issue Tracker

The following table contains known issues, scheduled bug fixes, and feature improvements for the Capacitive Touch Display 10.1" LVDS.

For other information, click on the below links:

Issue #	Status	Subject	Affected Versions	Implemented In
HAR-8250	Known Issue	High peak current caused by the 10.1'' LVDS display due to the brightness control implementation	Capacitive Touch Display 10.1" LVDS V1.0
Customer Impact: The high current peaks on pins 39 and 40 of the LVDS connector might trigger the current protection threshold of the power supply circuit used to generate the VCC/LED+ voltage on carrier boards. The peak current can cause issues especially at low brightness levels. Description: The backlight inverter of the 10.1'' LVDS display might create high current peaks on the two VCC/LED+ pins of the LVDS connector (pins 29 and 30 of CON4-INPUT). The PWM backlight control signal directly enables and disables the backlight inverter. Enabling the inverter can cause an inrush current. Since the inverter is disabled and re-enabled continuously, this can cause repeated current peaks. Especially at low backlight levels, these peaks can be significant. Workaround: Customers should check the power supply circuit used to generate the LVDS VCC/LED+ voltage on the carrier board, to ensure it can provide at least 650mA at 12V.

Issue #

Status

Subject

Affected Versions

Implemented In

HAR-8250

Known Issue

High peak current caused by the 10.1'' LVDS display due to the brightness control implementation

Capacitive Touch Display 10.1" LVDS V1.0

Customer Impact: The high current peaks on pins 39 and 40 of the LVDS connector might trigger the current protection threshold of the power supply circuit used to generate the VCC/LED+ voltage on carrier boards. The peak current can cause issues especially at low brightness levels.

Description: The backlight inverter of the 10.1'' LVDS display might create high current peaks on the two VCC/LED+ pins of the LVDS connector (pins 29 and 30 of CON4-INPUT). The PWM backlight control signal directly enables and disables the backlight inverter. Enabling the inverter can cause an inrush current. Since the inverter is disabled and re-enabled continuously, this can cause repeated current peaks. Especially at low backlight levels, these peaks can be significant.

Workaround: Customers should check the power supply circuit used to generate the LVDS VCC/LED+ voltage on the carrier board, to ensure it can provide at least 650mA at 12V.