Data Driver Output Masking for Noise-Stable Display Panels
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Solution Overview
Problem
Display devices experience degradation of image quality due to issues with the output of data drivers, leading to unintended noise and malfunctions.
Innovation Solution
The implementation of a masking switch and delay unit in the data driver circuit, connected to level shifters and XOR gates, to control the output of data voltages, preventing simultaneous transitions that cause noise by synchronizing the masking process with a latch start pulse and using asynchronous or synchronous delay mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data driver outputs data voltage continuously without control, then the data lines remain active, but unintended noise and image quality degradation occur due to simultaneous transitions
Solution Approach 1:
The masking switch is turned off before the data voltage transition occurs, preemptively preventing noise generation. The control method predicts when transitions will happen and masks the output in advance, eliminating the harmful effect before it can manifest as image noise.
Solution Approach 2:
The masking switch acts as an intermediary component between the data driver output and the data line. It controls whether the data voltage is transmitted to the data line, filtering out harmful transitions while allowing valid data to pass through, thus mediating between the data driver and display panel.
2Reliability
If masking switches are added to control each level shifter output, then noise is reduced, but device complexity increases
Solution Approach 1:
Multiple masking switches are controlled by a single unified control signal generated from the image data itself. Instead of requiring independent control circuits for each masking switch, the invention merges their control into one signal path, reducing overall complexity while maintaining the noise reduction function.
Solution Approach 2:
The control signal for the masking switches is derived automatically from the image data being processed, without requiring external control inputs. The system uses its own data signals to generate the masking control, making the system self-regulating and reducing external control complexity.
Data Source
AI summary
The present disclosure relates to a display device, and more specifically, to a display device for controlling outputs by arranging a masking switch or an XOR gate between a level shifter and a switch array of a data driver. The display device presented herein minimizes or at least reduces the degradation of image quality by controlling the output of the data driver under a specific condition.