Display Apparatus Channel Tuning via Reference Frame Timing Prediction
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Solution Overview
Problem
Digital display apparatuses, such as digital TVs and IPTVs, experience prolonged channel change times due to the need to seek and buffer reference frames during channel changes, resulting in a user-perceived delay where they view a black screen during the transition.
Innovation Solution
A display apparatus and control method that predict the timing for receiving a reference frame based on timing information from an external apparatus, allowing the channel tuning to be delayed until the predicted timing, thereby eliminating the need for immediate channel seeking and buffering, and ensuring continuous display of the existing channel during the transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the digital display apparatus performs buffering with respect to each GOP including I picture, P picture, and B picture to ensure proper video decoding, then the video quality and decoding accuracy are improved, but the channel change time increases significantly due to the need to seek and buffer reference frames
Solution Approach 1:
The system performs preliminary actions by receiving timing information of reference frames in advance from an external apparatus before channel change is initiated. This allows the tuner to predict when the reference frame will be available and prepare for channel switching proactively, rather than waiting until the channel change command is executed. The preliminary reception of timing data enables the system to overlap the channel tuning process with the reference frame reception process.
Solution Approach 2:
The system skips the traditional sequential process of stopping current channel, seeking reference frame, buffering, then switching. Instead, it rushes through the channel change by delaying the tuner switching until the reference frame timing is predicted, allowing the system to maintain continuous display of current channel while preparing for switch in the background.
2Manufacturing precision
If the display apparatus enters into a standby state (mute state) during channel change to perform tuning and buffering operations, then the channel switching accuracy is improved, but the user experience deteriorates due to viewing a black screen during the transition
Solution Approach 1:
The system performs preliminary channel tuning and reference frame reception in advance before the user perceives the channel change. By predicting the reference frame timing and completing tuning operations beforehand, the system ensures that when the channel change is displayed, the new channel is already ready and synchronized with the reference frame, eliminating the black screen effect.
Solution Approach 2:
The system maintains continuity of useful action by continuously displaying the current channel content while the tuner is switching to the new channel in the background. The display apparatus does not enter a mute state but continues to show meaningful content (current channel) until the new channel is fully prepared and synchronized, ensuring uninterrupted user experience.
3Speed
If the display apparatus seeks the I picture of the target channel immediately upon receiving a channel change command, then the channel change speed should be improved, but the synchronization with reference frame timing deteriorates, requiring additional buffering time
Solution Approach 1:
The system uses feedback from the external apparatus that provides timing information about when reference frames will be transmitted on the target channel. This feedback allows the display apparatus to adjust its channel tuning timing to match the reference frame arrival, eliminating the need for blind immediate seeking followed by buffering. The tuner switches channels at the optimal moment when the reference frame is expected to arrive.
Solution Approach 2:
The system changes the timing parameter of channel tuning from immediate execution to delayed execution based on predicted reference frame timing. By adjusting when the channel switch occurs (changing the time parameter), the system aligns the tuning completion with the expected arrival of the reference frame, eliminating the need for additional buffering while maintaining synchronization.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a tuner configured to receive a broadcast signal including a plurality of frames by tuning a channel, a display configured to display the received broadcast signal, an interface comprising interface circuitry configured to receive a channel change command, communication circuitry configured to receive timing information of the reference frame of the broadcast signal provided through a channel tuned according to the channel change command from an external apparatus, and a processor configured to, in response to the channel change command being received, predict timing for receiving the reference frame through the tuner based on the timing information of the reference frame received through the communication circuitry, to determine timing for performing channel tuning according to the channel change command based on the predicted timing, and to delay the channel tuning until the determined timing.