Data Signal Regulating Circuit for Screen Split Prevention
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Solution Overview
Problem
The phenomenon of screen splitting occurs in display devices due to gamma voltage drop and other issues, leading to inconsistent display across different source driver chips, especially in larger LCDs with increased panel size and refresh rates.
Innovation Solution
A data signal regulating circuit is introduced, comprising a feedback unit and a regulating unit connected to adjacent source driver groups, which adjusts data signals to ensure uniformity by detecting and amplifying signal differences and outputting regulation signals via operational amplifiers and comparators to maintain identical data signals across adjacent groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gamma voltage is delivered to multiple source driver chips, then larger panel size and greater refresh rate are achieved, but voltage changes including gamma voltage drop occur resulting in screen split phenomenon
Solution Approach 1:
The patent implements a feedback mechanism where the first source driver group detects the data signal difference between itself and the second source driver group, then feeds back a regulation signal to adjust the data signal of the first source driver group. This closed-loop feedback system compensates for voltage drops and ensures display uniformity across the large panel.
Solution Approach 2:
The patent dynamically adjusts the data signal parameters (voltage levels) of the first source driver group based on the detected signal difference. By changing the signal parameters in real-time through the feedback regulation, the system compensates for the gamma voltage drop caused by delivering voltage across the large panel area.
2Speed
If gamma voltage is delivered to multiple source driver chips, then greater refresh rate is achieved, but voltage changes including gamma voltage drop occur resulting in screen split phenomenon
Solution Approach 1:
The feedback mechanism continuously monitors data signal differences between adjacent source driver groups and dynamically regulates the signals to maintain uniformity. This real-time feedback compensation works independently of the refresh rate, allowing high refresh rates to be maintained while preventing screen split phenomenon through active signal adjustment.
3Reliability
If data signals are regulated between adjacent source driver groups, then screen split phenomenon is eliminated, but device complexity increases
Solution Approach 1:
The patent divides the display panel into multiple source driver groups (first source driver group, second source driver group, etc.) arranged in sequence. Each group can be independently regulated, allowing the complex compensation task to be distributed across multiple segments rather than requiring a single complex regulation system.
Solution Approach 2:
The first source driver group performs self-regulation by detecting its own data signal difference with the second source driver group and automatically adjusting its output through the feedback mechanism. This self-service approach reduces the need for external complex regulation circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively eliminates screen splitting by ensuring identical data signals are output by adjacent source driver units, thereby improving display performance and uniformity.
Implementation Method 1
The operational amplifier is configured to detect and amplify the data signal difference of the two adjacent the source driver groups
Implementation Method 2
The comparator is configured to compare magnitude of the amplified data signal difference with a reference voltage, and to output the feedback signal to the regulating unit when the amplified data signal difference deviates from the reference voltage
Data Source
AI summary
A data signal regulating circuit and a display device are disclosed. The data signal regulating circuit is applied to a display panel including a plurality of source driver groups, a feedback unit and an regulating unit. Any two adjacent ones of the source driver groups are provided with a data signal regulating circuit. The feedback unit is used to output a feedback signal to the regulating unit according to data signal difference between two adjacent source driver groups. The regulating unit is used to regulate the data signals output from the corresponding source driver groups according to the feedback signal.