Display Panel Signal Controller Boundary Detection Pre-Charging
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Solution Overview
Problem
As display device resolution increases, the charging rate of pixels decreases, leading to potential spots and blurred boundary regions between image patterns, especially with higher frame frequencies and inverted data voltage polarity.
Innovation Solution
A display device and driving method that include a signal controller with a vertical boundary detector and adjusters using lookup tables to adjust image signals for pixels near pattern boundaries, overlapping pre-charging and main-charging periods to improve charging rates and prevent blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display device resolution is increased, then image quality is improved, but pixel charging rate decreases causing spot generation
Solution Approach 1:
The patent applies preliminary action by introducing a pre-charging period before the main charging period. During this pre-charging period, pixels are partially charged in advance, so that when the main charging occurs, the pixel reaches the target voltage more quickly. This resolves the contradiction by preparing the pixel beforehand to overcome the time constraint imposed by high resolution displays.
Solution Approach 2:
The patent implements dynamics by making the gate signal width variable. The gate signal is extended to include both a pre-charging period and a main charging period, allowing the charging process to occur in two dynamic phases. This dynamic adjustment of the gate signal timing enables the pixel charging rate to keep up with the increased resolution requirements.
2Speed
If frame frequency is increased, then display smoothness is improved, but pixel charging rate decreases causing spots
Solution Approach 1:
By introducing a pre-charging period before the main charging period, the patent prepares pixels in advance for the upcoming frame display. This preliminary charging action ensures that even at high frame frequencies where time is critical, pixels are partially charged beforehand, preventing spot generation while maintaining smooth display.
Solution Approach 2:
The patent ensures continuity of useful action by overlapping the pre-charging period of one frame with the display period of the previous frame. This continuous charging process eliminates idle time and ensures that pixel charging keeps pace with the increased frame frequency, maintaining display smoothness without spots.
3Stability of the object's composition
If data voltage polarity is inverted, then display uniformity is improved, but pixel charging time becomes insufficient causing blurred boundaries
Solution Approach 1:
The patent applies dynamics by making the gate signal width adaptable to different operating conditions. When data voltage polarity inversion is used to improve display uniformity, the gate signal is dynamically extended to provide both pre-charging and main charging periods, ensuring sufficient charging time is available regardless of the polarity inversion effect.
Solution Approach 2:
The pre-charging period serves as preliminary action that compensates for the charging time loss caused by data voltage polarity inversion. By charging pixels partially in advance, the patent ensures that even when polarity inversion reduces the effective charging time during the main period, the pixel still reaches the correct voltage level without boundary blurring.
4Productivity
If pre-charging is performed, then charging rate is improved, but boundary regions between image patterns become blurred
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different pixel regions. Pixels near image pattern boundaries receive different charging control compared to pixels in uniform regions. The signal controller identifies boundary pixels and adjusts their pre-charging amount or timing, ensuring that charging rate improvement does not compromise boundary region clarity.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the pre-charging voltage level or duration based on the local image content. For pixels near boundaries, the pre-charging parameters are modified to prevent excessive charging that would cause blurring, while pixels in uniform regions receive full pre-charging benefit. This parameter adaptation resolves the contradiction between charging rate improvement and boundary clarity.
Data Source
AI summary
A display device and a driving method thereof is disclosed. In one aspect, the display device includes: a display panel including a plurality of pixels, a plurality of gate lines arranged in a column direction, and a plurality of data lines intersecting the plurality of gate lines; a data driver transferring data voltages to the plurality of data lines; a gate driver transferring gate signals to the plurality of gate lines; and a signal controller controlling the data driver and the gate driver. The signal controller includes: a vertical boundary detector determining whether a first pixel among the plurality of pixels is positioned in the vicinity of a boundary region of an image pattern based on an input image signal for the first pixel; and a first adjuster adjusting an image signal of the first pixel based on an image signal of a second pixel positioned in a row previous to the first pixel and the image signal of the first pixel to output an adjusted image signal, in the case in which it is determined by the vertical boundary detector that the first pixel is positioned in the vicinity of the boundary region of the image pattern.